Patchwork Port of VTV for Cygwin and MinGW

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Submitter Patrick Wollgast
Date Aug. 28, 2014, 11:03 a.m.
Message ID <53FF0C8C.8090507@rub.de>
Download mbox | patch
Permalink /patch/383780/
State New
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Comments

Patrick Wollgast - Aug. 28, 2014, 11:03 a.m.
This patch contains a port of VTV -fvtable-verify=std for Cygwin and MinGW.

Since weak symbols on Windows and Linux are implemented differently, and
VTV should have the possibility to be switched on and off, the structure
of the feature had to be modified.
On Linux libstdc++ contains the weak stub functions of VTV. For Cygwin
and MinGW they have been removed, due to the difference of weak symbols.
On Linux and on Windows libstdc++ itself gets build with
-fvtable-verify=std. Since libvtv gets build after libstdc++, and
libstdc++ doesn't contain the stub functions any more, 'undefined
reference' errors are thrown during linking of libstdc++. To prevent
these errors during the linking process a libvtv-0.dll gets build from
the stub functions before libstdc++-6.dll is linked.
At the end of the build process two VTV dlls have been build. One is
called libvtv-0.dll, containing the real functions, the other is called
libvtv_stubs-0.dll, containing the stub functions. Depending on whether
libvtv-0.dll is first found in the dll search path or
libvtv_stubs-0.dll, renamed to libvtv-0.dll, the real functions or the
stub functions are used.

Testing:
The test builds were configured the following way:
Linux 64bit (from patched and unpatched trunk):
/path/to/configure --prefix=/prefix/gcc-vtv-bin-64
--enable-libstdcxx-threads --enable-vtable-verify=yes
MinGW 32bit cross compiled:
/path/to/configure --target=i686-w64-mingw32
--prefix=/prefix/mingw-vtv-bin-32 --with-gnu-ld --with-gnu-as
--enable-fully-dynamic-string --disable-multilib
--enable-libstdcxx-threads --enable-vtable-verify=yes
MinGW 64bit cross compiled:
/path/to/configure --target=x86_64-w64-mingw32
--prefix=/prefix/mingw-vtv-bin-64 --with-gnu-ld --with-gnu-as
--enable-fully-dynamic-string --disable-multilib
--enable-libstdcxx-threads --enable-vtable-verify=yes
Cygwin 64bit:
/path/to/configure --enable-languages=c,c++ --enable-libstdcxx-threads
--enable-vtable-verify=yes

At Linux the patched and unpatched version resulted in the same number
of passed tests with 'make check-target-libvtv'.

Since MinGW was cross compiled the test cases couldn't be built and run
with 'make check-target-libvtv'. Therefore they were built with the
attached makefiles and tested afterwards on Windows 7 64bit. Some test
cases contain Linux specific parts and weren't tested. See the makefiles
for further information. Additionally virtual_func_test_min_UAF.cpp was
also built and tested. All built tests passed.

Cygwin was just tested on gcc 4.9.0, because the current trunk isn't
building for me. Even the clean trunk without the patch attached to this
mail. On Cygwin with gcc 4.9.0 VTV worked.

Besides the test cases Botan was also built and tested (gcc 4.9.0) with
MinGW 32bit and VTV.

regards
* config/i386/cygwin.h (STARTFILE_SPEC): Add vtv_start.o,
    if -fvtable-verify=std is used.
* config/i386/mingw-w64.h (STARTFILE_SPEC): Likewise.
* config/i386/mingw32.h (STARTFILE_SPEC): Likewise.
* config/i386/cygwin.h (ENDFILE_SPEC): Add vtv_end.o,
    if -fvtable-verify=std is used.
* config/i386/mingw32.h (ENDFILE_SPEC): Likewise.
* config/i386/cygwin.h (LIB_SPEC): Pass -lvtv and -lpsapi,
    if -fvtable-verify=std is used.
* config/i386/mingw-w64.h (LIB_SPEC): Likewise.
* config/i386/mingw32.h (LIB_SPEC): Likewise.


* gcc/varasm.c (assemble_variable): Add code to properly set the comdat
    section and name for the .vtable_map_vars section in case the
    target is PE or COFF.


* libgcc/Makefile.in: Move rules to build vtv_*.o out of the check
    for CUSTOM_CRTSTUFF.
* libgcc/config.host (i[34567]86-*-cygwin*, x86_64-*-cygwin*, i[34567]86-*-mingw*)
    (x86_64-*-mingw*): Only add vtv_*.o to extra_parts if enable_vtable_verify.


* libstdc++-v3/acinclude.m4: Define VTV_CYGMIN.
* libstdc++-v3/configure: Regenerate.

* libstdc++-v3/libsupc++/Makefile.am: Add vtv_sources only to
    libsupc___la_SOURCES and libsupc__convenience_la_SOURCES if VTV_CYGMIN is
    not set.
* libstdc++-v3/libsupc++/Makefile.in: Regenerated.
* libstdc++-v3/libsupc++/vtv_stubs.cc: Add none weak declaration of every
    function for Cygwin and MinGW.

* libstdc++-v3/src/Makefile.am: Add libvtv.la to toolexeclib_LTLIBRARIES,
    if VTV_CYGMIN is set. Define libvtv_la_SOURCES, libvtv_la_LDFLAGS,
    libvtv_la_AM_CXXFLAGS and libvtv_la_LINK if VTV_CYGMIN is set.
* libstdc++-v3/src/Makefile.in: Regenerate.


* libvtv/Makefile.am : Add libvtv.la to toolexeclib_LTLIBRARIES, if VTV_CYGMIN
    is set. Define libvtv_la_LIBADD, libvtv_la_LDFLAGS, libvtv_stubs_la_LDFLAGS
    and libvtv_stubs_la_SOURCES if VTV_CYGMIN is set. Add obstac.c to
    libvtv_la_SOURCES if VTV_CYGMIN is set.
* libvtv/Makefile.in : Regenerate.
* libvtv/aclocal.m4 : Regenerate.
* libvtv/configure : Regenerate.
* libvtv/configure.ac : Add ACX_LT_HOST_FLAGS. Define VTV_CYGMIN.
* libvtv/configure.tgt : (x86_64-*-cygwin*, i?86-*-cygwin*, x86_64-*-mingw*)
    (i?86-*-mingw*): Add to supported targets.
* libvtv/obstack.c : New file.
* libvtv/vtv_fail.cc : Skip inclusion of execinfo.h on Cygwin and MinGW.
(log_error_message): Skip calls to backtrace and backtrace_symbols_fd on Cygwin
    and MinGW.
* libvtv/vtv_malloc.cc : Include windows.h and skip sys/mman.h inclusion on
    Cygwin and MinGW. Add sysconf and mprotect port on Cygwin and MinGW.
(obstack_chunk_alloc): Exchange call to mmap with call to VirtualAlloc on Cygwin
    and MinGW.
(__vtv_malloc_init): Exchange call to sysconf with call to port of sysconf on
    Cygwin and MinGW.
* libvtv/vtv_malloc.h : Declare mprotect and define PROT_READ and PROT_WRITE on
    Cygwin and MinGW.
* libvtv/map.h : Include stdint.h on MinGW.
* libvtv/rts.cc : Include windows.h, winternl.h and psapi.h, skip include of
    execinfo.h, sys/mman.h and link.h on Cygwin and MinGW.
    Add port of __fortify_fail on Cygwin and MinGW.
    Change ElfW (Addr) to uintptr_t on Cygwin and MinGW.
(read_section_offset_and_length): Add port for Cygwin and MinGW
(iterate_modules): New function.
(vtv_unprotect_vtable_vars): Use iterate_modules instead of dl_iterate_phdr on
    Cygwin and MinGW.
(vtv_protect_vtable_vars): Likewise.
(count_all_pages): Likewise.
(dl_iterate_phdr_count_pages): Don't build on Cygwin and MinGW.
* libvtv/utils.cc : Include windows.h and skip execinfo.h inclusion on
    Cygwin and MinGW.
(__vtv_open_log): Exchange call to getuid and getpid with GetCurrentProcessId and
    adjust call to snprintf accordingly on Cygwin and MinGW.
    Adjust calls to mkdir on MinGW.
    Adjust call to open on Cygwin and MinGW.
(__vtv_add_to_log): Adjust call to snprintf on Cygwin and MinGW.
(__vtv_log_verification_failure): Don't generate a backtrace on Cygwin and MinGW.
all:
	### -O2
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/bb_tests.cc -o ./bb_tests-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/const_vtable.cc -o ./const_vtable-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dataentry.cc -o ./dataentry-O2.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-lib.cpp -o ./derived-lib-O2.exe
	# no lib.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-main.cpp -o ./derived-main-O2.exe
	# no lib.h
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dup_name.cc -o ./dup_name-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/environment.cc -o ./environment-O2.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-defintions.cpp -o ./event-defintions-O2.exe
	# undefined reference to 'WinMain'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-main.cpp -o ./event-main-O2.exe
	# undefined reference to 'Event::Event()'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-private.cpp -o ./event-private-O2.exe
	# undefined reference to 'Event::*()'
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/mul_inh.cc -o ./mul_inh-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/nested_vcall_test.cc -o ./nested_vcall_test-O2.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts-views.cpp -o ./parts-test-extra-parts-views-O2.exe
	# undefined reference to 'ExtraParts::*()'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts.cpp -o ./parts-test-extra-parts-O2.exe
	# undefined reference to 'WinMain'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-main.cpp -o ./parts-test-main-O2.exe
	# undefined reference to 'ExtraPartsViews::ExtraPartsViews()'
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/povray-derived.cc -o ./povray-derived-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair.cc -o ./register_set_pair-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair_inserts.cc -o ./register_set_pair_inserts-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list-iostream.cc -o ./template-list-iostream-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list.cc -o ./template-list-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list2.cc -o ./template-list2-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/test1.cc -o ./test1-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk.cc -o ./thunk-O2.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk_vtable_map_attack.cc -o ./thunk_vtable_map_attack-O2.exe
	# no sigjmp_buf, etc.
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/v8-test-2.cc -o ./v8-test-2-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtfunc-test.cc -o ./virtfunc-test-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtual_inheritance.cc -o ./virtual_inheritance-O2.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/xlan-test.cc -o ./xlan-test-O2.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_negative.cc -o ./mempool_negative-O2.exe
	# no sigjmp_buf, etc.
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_positive.cc -o ./mempool_positive-O2.exe
	# no siginfo_t, etc.
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_inserts_mt.cc -o ./register_set_pair_inserts_mt-O2.exe
	# no pthread_*
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_mt.cc -o ./register_set_pair_mt-O2.exe
	# no pthread_*
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen.cc -o ./dlopen-O2.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen_mt.cc -o ./dlopen_mt-O2.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/field-test.cc -o ./field-test-O2.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/replace-fail.cc -o ./replace-fail-O2.exe
	# undefined reference to 'WinMain'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/so.cc -o ./so-O2.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv.cc -o ./temp_deriv-O2.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv2.cc -o ./temp_deriv2-O2.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv3.cc -o ./temp_deriv3-O2.exe
	# no dlfcn.h

	### -O0
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/bb_tests.cc -o ./bb_tests-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/const_vtable.cc -o ./const_vtable-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dataentry.cc -o ./dataentry-O0.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-lib.cpp -o ./derived-lib-O0.exe
	# no lib.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-main.cpp -o ./derived-main-O0.exe
	# no lib.h
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dup_name.cc -o ./dup_name-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/environment.cc -o ./environment-O0.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-defintions.cpp -o ./event-defintions-O0.exe
	# undefined reference to 'WinMain'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-main.cpp -o ./event-main-O0.exe
	# undefined reference to 'Event::Event()'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-private.cpp -o ./event-private-O0.exe
	# undefined reference to 'Event::*()'
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/mul_inh.cc -o ./mul_inh-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/nested_vcall_test.cc -o ./nested_vcall_test-O0.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts-views.cpp -o ./parts-test-extra-parts-views-O0.exe
	# undefined reference to 'ExtraParts::*()'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts.cpp -o ./parts-test-extra-parts-O0.exe
	# undefined reference to 'WinMain'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-main.cpp -o ./parts-test-main-O0.exe
	# undefined reference to 'ExtraPartsViews::ExtraPartsViews()'
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/povray-derived.cc -o ./povray-derived-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair.cc -o ./register_set_pair-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair_inserts.cc -o ./register_set_pair_inserts-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list-iostream.cc -o ./template-list-iostream-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list.cc -o ./template-list-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list2.cc -o ./template-list2-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/test1.cc -o ./test1-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk.cc -o ./thunk-O0.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk_vtable_map_attack.cc -o ./thunk_vtable_map_attack-O0.exe
	# no sigjmp_buf, etc.
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/v8-test-2.cc -o ./v8-test-2-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtfunc-test.cc -o ./virtfunc-test-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtual_inheritance.cc -o ./virtual_inheritance-O0.exe
	i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/xlan-test.cc -o ./xlan-test-O0.exe
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_negative.cc -o ./mempool_negative-O0.exe
	# no sigjmp_buf, etc.
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_positive.cc -o ./mempool_positive-O0.exe
	# no siginfo_t, etc.
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_inserts_mt.cc -o ./register_set_pair_inserts_mt-O0.exe
	# no pthread_*
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_mt.cc -o ./register_set_pair_mt-O0.exe
	# no pthread_*
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen.cc -o ./dlopen-O0.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen_mt.cc -o ./dlopen_mt-O0.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/field-test.cc -o ./field-test-O0.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/replace-fail.cc -o ./replace-fail-O0.exe
	# undefined reference to 'WinMain'
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/so.cc -o ./so-O0.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv.cc -o ./temp_deriv-O0.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv2.cc -o ./temp_deriv2-O0.exe
	# no dlfcn.h
	#i686-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv3.cc -o ./temp_deriv3-O0.exe
	# no dlfcn.h
all:
	### -O2
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/bb_tests.cc -o ./bb_tests-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/const_vtable.cc -o ./const_vtable-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dataentry.cc -o ./dataentry-O2.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-lib.cpp -o ./derived-lib-O2.exe
	# no lib.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-main.cpp -o ./derived-main-O2.exe
	# no lib.h
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dup_name.cc -o ./dup_name-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/environment.cc -o ./environment-O2.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-defintions.cpp -o ./event-defintions-O2.exe
	# undefined reference to 'WinMain'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-main.cpp -o ./event-main-O2.exe
	# undefined reference to 'Event::Event()'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-private.cpp -o ./event-private-O2.exe
	# undefined reference to 'Event::*()'
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/mul_inh.cc -o ./mul_inh-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/nested_vcall_test.cc -o ./nested_vcall_test-O2.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts-views.cpp -o ./parts-test-extra-parts-views-O2.exe
	# undefined reference to 'ExtraParts::*()'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts.cpp -o ./parts-test-extra-parts-O2.exe
	# undefined reference to 'WinMain'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-main.cpp -o ./parts-test-main-O2.exe
	# undefined reference to 'ExtraPartsViews::ExtraPartsViews()'
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/povray-derived.cc -o ./povray-derived-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair.cc -o ./register_set_pair-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair_inserts.cc -o ./register_set_pair_inserts-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list-iostream.cc -o ./template-list-iostream-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list.cc -o ./template-list-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list2.cc -o ./template-list2-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/test1.cc -o ./test1-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk.cc -o ./thunk-O2.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk_vtable_map_attack.cc -o ./thunk_vtable_map_attack-O2.exe
	# no sigjmp_buf, etc.
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/v8-test-2.cc -o ./v8-test-2-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtfunc-test.cc -o ./virtfunc-test-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtual_inheritance.cc -o ./virtual_inheritance-O2.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/xlan-test.cc -o ./xlan-test-O2.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_negative.cc -o ./mempool_negative-O2.exe
	# no sigjmp_buf, etc.
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_positive.cc -o ./mempool_positive-O2.exe
	# no siginfo_t, etc.
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_inserts_mt.cc -o ./register_set_pair_inserts_mt-O2.exe
	# no pthread_*
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_mt.cc -o ./register_set_pair_mt-O2.exe
	# no pthread_*
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen.cc -o ./dlopen-O2.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen_mt.cc -o ./dlopen_mt-O2.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/field-test.cc -o ./field-test-O2.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/replace-fail.cc -o ./replace-fail-O2.exe
	# undefined reference to 'WinMain'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/so.cc -o ./so-O2.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv.cc -o ./temp_deriv-O2.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv2.cc -o ./temp_deriv2-O2.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O2 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv3.cc -o ./temp_deriv3-O2.exe
	# no dlfcn.h

	### -O0
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/bb_tests.cc -o ./bb_tests-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/const_vtable.cc -o ./const_vtable-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dataentry.cc -o ./dataentry-O0.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-lib.cpp -o ./derived-lib-O0.exe
	# no lib.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/derived-main.cpp -o ./derived-main-O0.exe
	# no lib.h
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/dup_name.cc -o ./dup_name-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/environment.cc -o ./environment-O0.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-defintions.cpp -o ./event-defintions-O0.exe
	# undefined reference to 'WinMain'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-main.cpp -o ./event-main-O0.exe
	# undefined reference to 'Event::Event()'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/event-private.cpp -o ./event-private-O0.exe
	# undefined reference to 'Event::*()'
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/mul_inh.cc -o ./mul_inh-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/nested_vcall_test.cc -o ./nested_vcall_test-O0.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts-views.cpp -o ./parts-test-extra-parts-views-O0.exe
	# undefined reference to 'ExtraParts::*()'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-extra-parts.cpp -o ./parts-test-extra-parts-O0.exe
	# undefined reference to 'WinMain'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/parts-test-main.cpp -o ./parts-test-main-O0.exe
	# undefined reference to 'ExtraPartsViews::ExtraPartsViews()'
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/povray-derived.cc -o ./povray-derived-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair.cc -o ./register_set_pair-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/register_set_pair_inserts.cc -o ./register_set_pair_inserts-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list-iostream.cc -o ./template-list-iostream-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list.cc -o ./template-list-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/template-list2.cc -o ./template-list2-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/test1.cc -o ./test1-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk.cc -o ./thunk-O0.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/thunk_vtable_map_attack.cc -o ./thunk_vtable_map_attack-O0.exe
	# no sigjmp_buf, etc.
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/v8-test-2.cc -o ./v8-test-2-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtfunc-test.cc -o ./virtfunc-test-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/virtual_inheritance.cc -o ./virtual_inheritance-O0.exe
	x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.cc/xlan-test.cc -o ./xlan-test-O0.exe
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_negative.cc -o ./mempool_negative-O0.exe
	# no sigjmp_buf, etc.
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mempool.cc/mempool_positive.cc -o ./mempool_positive-O0.exe
	# no siginfo_t, etc.
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_inserts_mt.cc -o ./register_set_pair_inserts_mt-O0.exe
	# no pthread_*
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/libvtv.mt.cc/register_set_pair_mt.cc -o ./register_set_pair_mt-O0.exe
	# no pthread_*
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen.cc -o ./dlopen-O0.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/dlopen_mt.cc -o ./dlopen_mt-O0.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/field-test.cc -o ./field-test-O0.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/replace-fail.cc -o ./replace-fail-O0.exe
	# undefined reference to 'WinMain'
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/so.cc -o ./so-O0.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv.cc -o ./temp_deriv-O0.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv2.cc -o ./temp_deriv2-O0.exe
	# no dlfcn.h
	#x86_64-w64-mingw32-g++ -v -fvtable-verify=std -O0 /home/a/Projects/gcc/libvtv/testsuite/other-tests/temp_deriv3.cc -o ./temp_deriv3-O0.exe
	# no dlfcn.h
Patrick Wollgast - Sept. 11, 2014, 4:12 a.m.
Ping for https://gcc.gnu.org/ml/gcc-patches/2014-08/msg02559.html

Also added Caroline Tice, as libvtv maintainer, to cc and attached
virtual_func_test_min_UAF.cpp, which I forgot in the original mail.

Patrick

On 28.08.2014 13:03, Patrick Wollgast wrote:
> This patch contains a port of VTV -fvtable-verify=std for Cygwin and MinGW.
> 
> Since weak symbols on Windows and Linux are implemented differently, and
> VTV should have the possibility to be switched on and off, the structure
> of the feature had to be modified.
> On Linux libstdc++ contains the weak stub functions of VTV. For Cygwin
> and MinGW they have been removed, due to the difference of weak symbols.
> On Linux and on Windows libstdc++ itself gets build with
> -fvtable-verify=std. Since libvtv gets build after libstdc++, and
> libstdc++ doesn't contain the stub functions any more, 'undefined
> reference' errors are thrown during linking of libstdc++. To prevent
> these errors during the linking process a libvtv-0.dll gets build from
> the stub functions before libstdc++-6.dll is linked.
> At the end of the build process two VTV dlls have been build. One is
> called libvtv-0.dll, containing the real functions, the other is called
> libvtv_stubs-0.dll, containing the stub functions. Depending on whether
> libvtv-0.dll is first found in the dll search path or
> libvtv_stubs-0.dll, renamed to libvtv-0.dll, the real functions or the
> stub functions are used.
> 
> Testing:
> The test builds were configured the following way:
> Linux 64bit (from patched and unpatched trunk):
> /path/to/configure --prefix=/prefix/gcc-vtv-bin-64
> --enable-libstdcxx-threads --enable-vtable-verify=yes
> MinGW 32bit cross compiled:
> /path/to/configure --target=i686-w64-mingw32
> --prefix=/prefix/mingw-vtv-bin-32 --with-gnu-ld --with-gnu-as
> --enable-fully-dynamic-string --disable-multilib
> --enable-libstdcxx-threads --enable-vtable-verify=yes
> MinGW 64bit cross compiled:
> /path/to/configure --target=x86_64-w64-mingw32
> --prefix=/prefix/mingw-vtv-bin-64 --with-gnu-ld --with-gnu-as
> --enable-fully-dynamic-string --disable-multilib
> --enable-libstdcxx-threads --enable-vtable-verify=yes
> Cygwin 64bit:
> /path/to/configure --enable-languages=c,c++ --enable-libstdcxx-threads
> --enable-vtable-verify=yes
> 
> At Linux the patched and unpatched version resulted in the same number
> of passed tests with 'make check-target-libvtv'.
> 
> Since MinGW was cross compiled the test cases couldn't be built and run
> with 'make check-target-libvtv'. Therefore they were built with the
> attached makefiles and tested afterwards on Windows 7 64bit. Some test
> cases contain Linux specific parts and weren't tested. See the makefiles
> for further information. Additionally virtual_func_test_min_UAF.cpp was
> also built and tested. All built tests passed.
> 
> Cygwin was just tested on gcc 4.9.0, because the current trunk isn't
> building for me. Even the clean trunk without the patch attached to this
> mail. On Cygwin with gcc 4.9.0 VTV worked.
> 
> Besides the test cases Botan was also built and tested (gcc 4.9.0) with
> MinGW 32bit and VTV.
> 
> regards
>
Caroline Tice - Sept. 12, 2014, 10:43 p.m.
First attempt to send this failed.

On Fri, Sep 12, 2014 at 3:41 PM, Caroline Tice <cmtice@google.com> wrote:
>
> Hi Patrick,
>
> Mostly your patch looks OK to me, though there are a couple of serious issues (mentioned below).  Most of my comments are for formatting stuff.   Once you have fixed these issues, let me know and I'll look at it again.  But someone else will still have to approve the parts of this patch that are outside the libvtv directory (I believe).
>
> -- Caroline Tice
> cmtice@google.com
>
>
> In changes to gcc/config/i386/cygwin.h  mingw-w64.h and mingw32.h, you forgot to handle the "fvtable-verify=preinit" options.  fvtable-veriy=preinit should cause vtv_start_preinit.o to be added to the STARTFILE_SPEC and vtv_end_preinit.o to be added to the ENDFILE_SPEC (as in  gcc/config/gnu-user.h).  I expect you will also need to add it to your LIB_SPEC definitions in those config files.
>
> in libgcc/config.host, the indentation looks wrong on the line 660 (where you add the extra parts for vtable verification for the case "i[34567]86-*-mingw*)". It also looks wrong on line 709 (again, adding extra parts, for case "x86_64-*-mingw*)".  The rest of the changes in that file look ok, but someone else will need to approve them.
>
> The changes in libgcc/Makefile.in and gcc/varasm.c look ok to me, but someone will will have to approve them since I don't have authority to approve changes there.
>
> in libstdc++-v3/libsupc++:
>
> Your change in Makefile.am looks ok to me; your changes in vtv_stubs.cc look ok, except that you appear to have messed up the indentations in the function headers (both for the declarations and the actual functions).  Also there is a typo in your comment:  'build' should be 'built'.  But content-wise, the change looks fine.  Again, someone else will have to actually approve these changes since I do not have that authority.
>
> in libstdc++-v3/src/Makefile.am also looks ok to me; someone else will have to give final approval.
>
>
> in libvtv/Makefile.am, you need to fix the indentation at line 64 (vtv_stubs.cc):
>
> vtv_stubs_sources = \
>         vtv_start.c \
>         vtv_stubs.cc \
>         vtv_end.c
>
> the rest of the changes in that file look good.
>
> Why did you make a copy of obstack.c in libvtv rather than using the one in libiberty?  It would be better not to make a second copy of the source file if that can be avoided...
>
> in libvtv/vtv_malloc.cc:
>
> lines 207-213:  Fix the indentation on the second line of call to VirtualAlloc.
> #if defined (__CYGWIN__) || defined (__MINGW32__)
>   if ((allocated = VirtualAlloc(NULL, size,  MEM_RESERVE|MEM_COMMIT,
>                         PAGE_READWRITE)) == 0)
> #else
>   if ((allocated = mmap (NULL, size, PROT_READ | PROT_WRITE,"
>                          MAP_PRIVATE | MAP_ANONYMOUS,  -1, 0)) == 0)
> #endif
>
> Remove extra blank line at line 216.
>
> in libvtv/vtv_rts.cc:
>
> Your version of the function read_section_offset_and_length has several lines that exceed the 80 character limit; please fix that.  Your function iterate_modules  also has one or two lines that are too long, and it needs a function comment.
>
> in libvtv/vtv_utils.cc:
>
> In the function __vtv_open_log, you seem to have the following code twice:
>
> #ifdef __MINGW32__
>       mkdir (logs_prefix);
> #else
>       mkdir (logs_prefix, S_IRWXU);
> #endif
>
> was there a reason for this, or is this an accident (in which case the second occurrence should be removed)?
>
>
>
> On Wed, Sep 10, 2014 at 9:12 PM, Patrick Wollgast <patrick.wollgast@rub.de> wrote:
>>
>> Ping for https://gcc.gnu.org/ml/gcc-patches/2014-08/msg02559.html
>>
>> Also added Caroline Tice, as libvtv maintainer, to cc and attached
>> virtual_func_test_min_UAF.cpp, which I forgot in the original mail.
>>
>> Patrick
>>
>> On 28.08.2014 13:03, Patrick Wollgast wrote:
>> > This patch contains a port of VTV -fvtable-verify=std for Cygwin and MinGW.
>> >
>> > Since weak symbols on Windows and Linux are implemented differently, and
>> > VTV should have the possibility to be switched on and off, the structure
>> > of the feature had to be modified.
>> > On Linux libstdc++ contains the weak stub functions of VTV. For Cygwin
>> > and MinGW they have been removed, due to the difference of weak symbols.
>> > On Linux and on Windows libstdc++ itself gets build with
>> > -fvtable-verify=std. Since libvtv gets build after libstdc++, and
>> > libstdc++ doesn't contain the stub functions any more, 'undefined
>> > reference' errors are thrown during linking of libstdc++. To prevent
>> > these errors during the linking process a libvtv-0.dll gets build from
>> > the stub functions before libstdc++-6.dll is linked.
>> > At the end of the build process two VTV dlls have been build. One is
>> > called libvtv-0.dll, containing the real functions, the other is called
>> > libvtv_stubs-0.dll, containing the stub functions. Depending on whether
>> > libvtv-0.dll is first found in the dll search path or
>> > libvtv_stubs-0.dll, renamed to libvtv-0.dll, the real functions or the
>> > stub functions are used.
>> >
>> > Testing:
>> > The test builds were configured the following way:
>> > Linux 64bit (from patched and unpatched trunk):
>> > /path/to/configure --prefix=/prefix/gcc-vtv-bin-64
>> > --enable-libstdcxx-threads --enable-vtable-verify=yes
>> > MinGW 32bit cross compiled:
>> > /path/to/configure --target=i686-w64-mingw32
>> > --prefix=/prefix/mingw-vtv-bin-32 --with-gnu-ld --with-gnu-as
>> > --enable-fully-dynamic-string --disable-multilib
>> > --enable-libstdcxx-threads --enable-vtable-verify=yes
>> > MinGW 64bit cross compiled:
>> > /path/to/configure --target=x86_64-w64-mingw32
>> > --prefix=/prefix/mingw-vtv-bin-64 --with-gnu-ld --with-gnu-as
>> > --enable-fully-dynamic-string --disable-multilib
>> > --enable-libstdcxx-threads --enable-vtable-verify=yes
>> > Cygwin 64bit:
>> > /path/to/configure --enable-languages=c,c++ --enable-libstdcxx-threads
>> > --enable-vtable-verify=yes
>> >
>> > At Linux the patched and unpatched version resulted in the same number
>> > of passed tests with 'make check-target-libvtv'.
>> >
>> > Since MinGW was cross compiled the test cases couldn't be built and run
>> > with 'make check-target-libvtv'. Therefore they were built with the
>> > attached makefiles and tested afterwards on Windows 7 64bit. Some test
>> > cases contain Linux specific parts and weren't tested. See the makefiles
>> > for further information. Additionally virtual_func_test_min_UAF.cpp was
>> > also built and tested. All built tests passed.
>> >
>> > Cygwin was just tested on gcc 4.9.0, because the current trunk isn't
>> > building for me. Even the clean trunk without the patch attached to this
>> > mail. On Cygwin with gcc 4.9.0 VTV worked.
>> >
>> > Besides the test cases Botan was also built and tested (gcc 4.9.0) with
>> > MinGW 32bit and VTV.
>> >
>> > regards
>> >
>>
>> --
>> Beste Grüße,
>> Patrick
>
>

Patch

Index: gcc/config/i386/cygwin.h
===================================================================
--- gcc/config/i386/cygwin.h	(Revision 214408)
+++ gcc/config/i386/cygwin.h	(Arbeitskopie)
@@ -41,12 +41,16 @@  along with GCC; see the file COPYING3.
 #define STARTFILE_SPEC "\
   %{!shared: %{!mdll: crt0%O%s \
   %{pg:gcrt0%O%s}}}\
-  %{shared:crtbeginS.o%s;:crtbegin.o%s}"
+  %{shared:crtbeginS.o%s;:crtbegin.o%s} \
+  %{fvtable-verify=none:%s; \
+    fvtable-verify=std:vtv_start.o%s}"
 
 #undef ENDFILE_SPEC
 #define ENDFILE_SPEC \
   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}\
    %{!shared:%:if-exists(default-manifest.o%s)}\
+   %{fvtable-verify=none:%s; \
+    fvtable-verify=std:vtv_end.o%s} \
    crtend.o%s"
 
 /* Normally, -lgcc is not needed since everything in it is in the DLL, but we
@@ -81,6 +85,7 @@  along with GCC; see the file COPYING3.
   %{pthread: } \
   -lcygwin \
   %{mwindows:-lgdi32 -lcomdlg32} \
+  %{fvtable-verify=std:-lvtv -lpsapi} \
   -ladvapi32 -lshell32 -luser32 -lkernel32"
 
 /* To implement C++ function replacement we always wrap the cxx
Index: gcc/config/i386/mingw-w64.h
===================================================================
--- gcc/config/i386/mingw-w64.h	(Revision 214408)
+++ gcc/config/i386/mingw-w64.h	(Arbeitskopie)
@@ -32,7 +32,9 @@  along with GCC; see the file COPYING3.
   %{!shared:%{!mdll:%{!municode:crt2%O%s}}} \
   %{!shared:%{!mdll:%{municode:crt2u%O%s}}} \
   %{pg:gcrt2%O%s} \
-  crtbegin.o%s"
+  crtbegin.o%s \
+  %{fvtable-verify=none:%s; \
+    fvtable-verify=std:vtv_start.o%s}"
 
 /* Enable multilib.  */
 
@@ -43,6 +45,7 @@  along with GCC; see the file COPYING3.
 #define LIB_SPEC "%{pg:-lgmon} %{" SPEC_PTHREAD1 ":-lpthread} " \
 		 "%{" SPEC_PTHREAD2 ": } " \
 		 "%{mwindows:-lgdi32 -lcomdlg32} " \
+     "%{fvtable-verify=std:-lvtv -lpsapi} " \
 		 "-ladvapi32 -lshell32 -luser32 -lkernel32"
 
 #undef SPEC_32
Index: gcc/config/i386/mingw32.h
===================================================================
--- gcc/config/i386/mingw32.h	(Revision 214408)
+++ gcc/config/i386/mingw32.h	(Arbeitskopie)
@@ -91,6 +91,7 @@  along with GCC; see the file COPYING3.
 #define LIB_SPEC "%{pg:-lgmon} %{" SPEC_PTHREAD1 ":-lpthread} " \
 		 "%{" SPEC_PTHREAD2 ": } " \
 		 "%{mwindows:-lgdi32 -lcomdlg32} " \
+     "%{fvtable-verify=std:-lvtv -lpsapi} " \
                  "-ladvapi32 -lshell32 -luser32 -lkernel32"
 
 /* Weak symbols do not get resolved if using a Windows dll import lib.
@@ -143,12 +144,16 @@  along with GCC; see the file COPYING3.
 #undef STARTFILE_SPEC
 #define STARTFILE_SPEC "%{shared|mdll:dllcrt2%O%s} \
   %{!shared:%{!mdll:crt2%O%s}} %{pg:gcrt2%O%s} \
-  crtbegin.o%s"
+  crtbegin.o%s \
+  %{fvtable-verify=none:%s; \
+    fvtable-verify=std:vtv_start.o%s}"
 
 #undef ENDFILE_SPEC
 #define ENDFILE_SPEC \
   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
    %{!shared:%:if-exists(default-manifest.o%s)}\
+   %{fvtable-verify=none:%s; \
+    fvtable-verify=std:vtv_end.o%s} \
   crtend.o%s"
 
 /* Override startfile prefix defaults.  */
Index: gcc/varasm.c
===================================================================
--- gcc/varasm.c	(Revision 214408)
+++ gcc/varasm.c	(Arbeitskopie)
@@ -2165,6 +2165,33 @@  assemble_variable (tree decl, int top_le
 			    	         DECL_NAME (decl));
           in_section = sect;
 #else
+          /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
+             Therefore the following check is used.
+             In case a the target is PE or COFF a comdat group section
+             is created, e.g. .vtable_map_vars$foo. The linker places
+             everything in .vtable_map_vars at the end.
+
+             A fix could be made in
+             gcc/config/i386/winnt.c: i386_pe_unique_section. */
+          if (TARGET_PECOFF)
+          {
+            char *name;
+            
+            if (TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE)
+              name = ACONCAT ((sect->named.name, "$",
+               IDENTIFIER_POINTER (DECL_NAME (decl)), NULL));
+            else
+              name = ACONCAT ((sect->named.name, "$",
+               IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl))),
+               NULL));
+
+            targetm.asm_out.named_section (name,
+             sect->named.common.flags
+                   | SECTION_LINKONCE,
+                       DECL_NAME (decl));
+            in_section = sect;
+        }
+        else
           switch_to_section (sect);
 #endif
         }
Index: libgcc/Makefile.in
===================================================================
--- libgcc/Makefile.in	(Revision 214408)
+++ libgcc/Makefile.in	(Arbeitskopie)
@@ -986,6 +986,7 @@  crtendS$(objext): $(srcdir)/crtstuff.c
 # This is a version of crtbegin for -static links.
 crtbeginT$(objext): $(srcdir)/crtstuff.c
 	$(crt_compile) $(CRTSTUFF_T_CFLAGS) -c $< -DCRT_BEGIN -DCRTSTUFFT_O
+endif
 
 ifeq ($(enable_vtable_verify),yes)
 # These are used in vtable verification; see comments in source files for
@@ -1002,7 +1003,6 @@  vtv_start_preinit$(objext): $(srcdir)/vt
 vtv_end_preinit$(objext): $(srcdir)/vtv_end_preinit.c
 	$(crt_compile) $(CRTSTUFF_T_CFLAGS_S) -c $(srcdir)/vtv_end_preinit.c
 endif
-endif
 
 ifeq ($(CUSTOM_CRTIN),)
 # -x assembler-with-cpp is only needed on case-insensitive filesystem.
Index: libgcc/config.host
===================================================================
--- libgcc/config.host	(Revision 214408)
+++ libgcc/config.host	(Arbeitskopie)
@@ -615,6 +615,9 @@  i[4567]86-wrs-vxworks|i[4567]86-wrs-vxwo
 	;;
 i[34567]86-*-cygwin*)
 	extra_parts="crtbegin.o crtbeginS.o crtend.o crtfastmath.o"
+	if test x$enable_vtable_verify = xyes; then
+		extra_parts="$extra_parts vtv_start.o vtv_end.o vtv_start_preinit.o vtv_end_preinit.o"
+	fi
 	# This has to match the logic for DWARF2_UNWIND_INFO in gcc/config/i386/cygming.h
 	if test x$enable_sjlj_exceptions = xyes; then
 		tmake_eh_file="i386/t-sjlj-eh"
@@ -631,6 +634,9 @@  i[34567]86-*-cygwin*)
 	;;
 x86_64-*-cygwin*)
 	extra_parts="crtbegin.o crtbeginS.o crtend.o crtfastmath.o"
+	if test x$enable_vtable_verify = xyes; then
+		extra_parts="$extra_parts vtv_start.o vtv_end.o vtv_start_preinit.o vtv_end_preinit.o"
+	fi
 	# This has to match the logic for DWARF2_UNWIND_INFO in gcc/config/i386/cygming.h
 	if test x$enable_sjlj_exceptions = xyes; then
 		tmake_eh_file="i386/t-sjlj-eh"
@@ -648,6 +654,9 @@  x86_64-*-cygwin*)
 	;;
 i[34567]86-*-mingw*)
 	extra_parts="crtbegin.o crtend.o crtfastmath.o"
+	if test x$enable_vtable_verify = xyes; then
+      extra_parts="$extra_parts vtv_start.o vtv_end.o vtv_start_preinit.o vtv_end_preinit.o"
+    fi
 	case ${target_thread_file} in
 	  win32)
 	    tmake_file="$tmake_file i386/t-gthr-win32"
@@ -694,6 +703,9 @@  x86_64-*-mingw*)
 	fi
 	tmake_file="${tmake_file} ${tmake_eh_file} ${tmake_dlldir_file} i386/t-slibgcc-cygming i386/t-mingw32 t-dfprules i386/t-crtfm i386/t-chkstk"
 	extra_parts="$extra_parts crtfastmath.o"
+	if test x$enable_vtable_verify = xyes; then
+      extra_parts="$extra_parts vtv_start.o vtv_end.o vtv_start_preinit.o vtv_end_preinit.o"
+    fi
 	;;
 i[34567]86-*-interix[3-9]*)
 	tmake_file="$tmake_file i386/t-interix i386/t-chkstk"
Index: libstdc++-v3/acinclude.m4
===================================================================
--- libstdc++-v3/acinclude.m4	(Revision 214408)
+++ libstdc++-v3/acinclude.m4	(Arbeitskopie)
@@ -2321,7 +2321,17 @@  AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY],
   AC_MSG_RESULT([$enable_vtable_verify])
 
   if test $enable_vtable_verify = yes; then
+    case ${target_os} in
+  cygwin*|mingw32*)
+    VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
+    vtv_cygmin="yes"
+    ;;
+  *)
     VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
+    vtv_cygmin="no"
+    ;;
+    esac
+    AM_CONDITIONAL(VTV_CYGMIN, test $vtv_cygmin = yes)
     VTV_PCH_CXXFLAGS="-fvtable-verify=std"
     VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"		
   else
Index: libstdc++-v3/libsupc++/Makefile.am
===================================================================
--- libstdc++-v3/libsupc++/Makefile.am	(Revision 214408)
+++ libstdc++-v3/libsupc++/Makefile.am	(Arbeitskopie)
@@ -98,9 +98,11 @@  sources = \
 	vterminate.cc
 
 if ENABLE_VTABLE_VERIFY
+if !VTV_CYGMIN
   vtv_sources = \
 	vtv_stubs.cc
 endif
+endif
 
 libsupc___la_SOURCES = $(sources) $(c_sources) $(vtv_sources)
 libsupc__convenience_la_SOURCES = $(sources) $(c_sources) $(vtv_sources)
Index: libstdc++-v3/libsupc++/vtv_stubs.cc
===================================================================
--- libstdc++-v3/libsupc++/vtv_stubs.cc	(Revision 214408)
+++ libstdc++-v3/libsupc++/vtv_stubs.cc	(Arbeitskopie)
@@ -37,6 +37,39 @@ 
 
 #include <cstddef>
 
+/* weak symbols on Windows work differently than on Linux. To be able
+   to switch vtv on and off on Windows two dlls are build. One with
+   the sources from libvtv, the other from these stubs. Depending on
+   which dll is placed in the folder of the executable the functions
+   from libvtv or the stubs functions are used. */
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+extern "C"
+void
+__VLTChangePermission(int);
+
+void
+__VLTRegisterSet(void**, const void*, std::size_t, std::size_t,
+       void**);
+
+void
+__VLTRegisterPair(void**, const void*, std::size_t,
+        const void*);
+
+const void*
+__VLTVerifyVtablePointer(void**, const void*);
+
+void
+__VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t,
+            void**);
+
+void
+__VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
+             const char*, const char*);
+
+const void*
+__VLTVerifyVtablePointerDebug(void**, const void*, const char*,
+               const char*);
+#else
 // Declare as weak for libsupc++, strong definitions are in libvtv.
 #if __GXX_WEAK__
 extern "C"
@@ -45,26 +78,27 @@  __VLTChangePermission(int) __attribute__
 
 void
 __VLTRegisterSet(void**, const void*, std::size_t, std::size_t,
-		 void**) __attribute__((weak));
+       void**) __attribute__((weak));
 
 void
 __VLTRegisterPair(void**, const void*, std::size_t,
-		  const void*) __attribute__((weak));
+        const void*) __attribute__((weak));
 
 const void*
 __VLTVerifyVtablePointer(void**, const void*) __attribute__((weak));
 
 void
 __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t,
-		      void**) __attribute__((weak));
+            void**) __attribute__((weak));
 
 void
 __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
-		       const char*, const char*) __attribute__((weak));
+             const char*, const char*) __attribute__((weak));
 
 const void*
 __VLTVerifyVtablePointerDebug(void**, const void*, const char*,
-			      const char*) __attribute__((weak));
+               const char*) __attribute__((weak));
+#endif
 #endif
 
 // Stub definitions.
@@ -91,10 +125,10 @@  __VLTRegisterSetDebug(void**, const void
 
 void
 __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
-		       const char*, const  char*)
+             const char*, const  char*)
 { }
 
 const void*
 __VLTVerifyVtablePointerDebug(void**, const void* vtable_ptr, const char*,
-			      const char*)
+               const char*)
 { return vtable_ptr; }
Index: libstdc++-v3/src/Makefile.am
===================================================================
--- libstdc++-v3/src/Makefile.am	(Revision 214408)
+++ libstdc++-v3/src/Makefile.am	(Arbeitskopie)
@@ -25,7 +25,30 @@  include $(top_srcdir)/fragment.am
 SUBDIRS = c++98 c++11
 
 # Cross compiler support.
+if VTV_CYGMIN
+toolexeclib_LTLIBRARIES = libvtv.la libstdc++.la
+else
 toolexeclib_LTLIBRARIES = libstdc++.la
+endif
+
+if VTV_CYGMIN
+vtv_stubs.cc:
+	rm -f $@
+	$(LN_S) $(toplevel_srcdir)/libstdc++-v3/libsupc++/vtv_stubs.cc $@
+
+libvtv_la_SOURCES = vtv_stubs.cc
+libvtv_la_LDFLAGS = $(lt_host_flags)
+
+libvtv_la_AM_CXXFLAGS = \
+	$(glibcxx_compiler_pic_flag) \
+	$(XTEMPLATE_FLAGS) \
+	-Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end \
+	$(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS)
+
+libvtv_la_LINK = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CXXLD) $(libvtv_la_AM_CXXFLAGS) \
+	$(CXXFLAGS) $(libvtv_la_LDFLAGS) $(LDFLAGS) -o $@
+endif
 
 vpath % $(top_srcdir)/src/c++98
 vpath % $(top_srcdir)/src/c++11
Index: libvtv/Makefile.am
===================================================================
--- libvtv/Makefile.am	(Revision 214408)
+++ libvtv/Makefile.am	(Arbeitskopie)
@@ -38,7 +38,11 @@  AM_CXXFLAGS = $(XCFLAGS)
 AM_CXXFLAGS += $(LIBSTDCXX_RAW_CXX_CXXFLAGS)
 AM_CXXFLAGS += -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end
 
-toolexeclib_LTLIBRARIES = libvtv.la
+if VTV_CYGMIN
+  toolexeclib_LTLIBRARIES = libvtv.la libvtv_stubs.la
+else
+  toolexeclib_LTLIBRARIES = libvtv.la
+endif
 
 vtv_headers = \
 	vtv_map.h \
@@ -55,6 +59,11 @@  vtv_sources = \
         vtv_utils.cc \
 	vtv_end.c
 
+vtv_stubs_sources = \
+	vtv_start.c \
+		vtv_stubs.cc \
+	vtv_end.c
+
 libvtv_includedir = $(libdir)/gcc/$(target_alias)/$(gcc_version)/include
 
 # Link in vtv_start and vtv_end. 
@@ -67,8 +76,25 @@  vtv_end.c:
 	rm -f $@
 	$(LN_S) $(toplevel_srcdir)/libgcc/vtv_end.c $@
 
+if VTV_CYGMIN
+  vtv_stubs.cc:
+	  rm -f $@
+	  $(LN_S) $(toplevel_srcdir)/libstdc++-v3/libsupc++/vtv_stubs.cc $@
+endif
+
+if VTV_CYGMIN
+  libvtv_la_LIBADD = -lpsapi
+  libvtv_la_LDFLAGS = $(lt_host_flags)
+  libvtv_stubs_la_LDFLAGS = $(lt_host_flags)
+endif
+
 if ENABLE_VTABLE_VERIFY
+if VTV_CYGMIN
+  libvtv_la_SOURCES = $(vtv_sources) obstack.c
+  libvtv_stubs_la_SOURCES = $(vtv_stubs_sources)
+else
   libvtv_la_SOURCES = $(vtv_sources)
+endif
   libvtv_include_HEADERS = $(vtv_headers)
 else
   libvtv_la_SOURCES =
@@ -78,6 +104,8 @@  endif
 # Least ordering for dependencies mean linking w/o libstdc++ for as
 # long as the development of libvtv does not absolutely require it.
 CXXVTV=$(CC_FOR_TARGET)
+CXXLD=$(CC_FOR_TARGET)
+
 LTCXXCOMPILE = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	--mode=compile $(CXXVTV) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
 	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)
Index: libvtv/configure.ac
===================================================================
--- libvtv/configure.ac	(Revision 214408)
+++ libvtv/configure.ac	(Arbeitskopie)
@@ -122,6 +122,7 @@  AC_CHECK_TOOL(RANLIB, ranlib, :)
 # Configure libtool
 AC_LIBTOOL_DLOPEN
 AM_PROG_LIBTOOL
+ACX_LT_HOST_FLAGS
 AC_SUBST(enable_shared)
 AC_SUBST(enable_static)
 
@@ -155,4 +156,15 @@  _EOF
 ])
 fi
 
+case "$target_os" in
+  cygwin*|mingw32*)
+    vtv_cygmin="yes"
+    ;;
+  *)
+    vtv_cygmin="no"
+    ;;
+esac
+
+AM_CONDITIONAL(VTV_CYGMIN, test $vtv_cygmin = yes)
+
 AC_OUTPUT
Index: libvtv/configure.tgt
===================================================================
--- libvtv/configure.tgt	(Revision 214408)
+++ libvtv/configure.tgt	(Arbeitskopie)
@@ -26,6 +26,12 @@  case "${target}" in
   x86_64-*-linux* | i?86-*-linux*)
 	VTV_SUPPORTED=yes
 	;;
+  x86_64-*-cygwin* | i?86-*-cygwin*)
+	VTV_SUPPORTED=yes
+	;;
+  x86_64-*-mingw* | i?86-*-mingw*)
+	VTV_SUPPORTED=yes
+	;;
   powerpc*-*-linux*)
 	;;
   sparc*-*-linux*)
Index: libvtv/obstack.c
===================================================================
--- libvtv/obstack.c	(Revision 0)
+++ libvtv/obstack.c	(Arbeitskopie)
@@ -0,0 +1,515 @@ 
+/* obstack.c - subroutines used implicitly by object stack macros
+   Copyright (C) 1988,89,90,91,92,93,94,96,97 Free Software Foundation, Inc.
+
+
+   NOTE: This source is derived from an old version taken from the GNU C
+   Library (glibc).
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#include <windows.h>
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "obstack.h"
+
+/* NOTE BEFORE MODIFYING THIS FILE: This version number must be
+   incremented whenever callers compiled using an old obstack.h can no
+   longer properly call the functions in this obstack.c.  */
+#define OBSTACK_INTERFACE_VERSION 1
+
+/* Comment out all this code if we are using the GNU C Library, and are not
+   actually compiling the library itself, and the installed library
+   supports the same library interface we do.  This code is part of the GNU
+   C Library, but also included in many other GNU distributions.  Compiling
+   and linking in this code is a waste when using the GNU C library
+   (especially if it is a shared library).  Rather than having every GNU
+   program understand `configure --with-gnu-libc' and omit the object
+   files, it is simpler to just do this in the source for each such file.  */
+
+#include <stdio.h>		/* Random thing to get __GNU_LIBRARY__.  */
+#if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
+#include <gnu-versions.h>
+#if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION
+#define ELIDE_CODE
+#endif
+#endif
+
+
+#ifndef ELIDE_CODE
+
+
+#define POINTER void *
+
+/* Determine default alignment.  */
+struct fooalign {char x; double d;};
+#define DEFAULT_ALIGNMENT  \
+  ((PTR_INT_TYPE) ((char *) &((struct fooalign *) 0)->d - (char *) 0))
+/* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT.
+   But in fact it might be less smart and round addresses to as much as
+   DEFAULT_ROUNDING.  So we prepare for it to do that.  */
+union fooround {long x; double d;};
+#define DEFAULT_ROUNDING (sizeof (union fooround))
+
+/* When we copy a long block of data, this is the unit to do it with.
+   On some machines, copying successive ints does not work;
+   in such a case, redefine COPYING_UNIT to `long' (if that works)
+   or `char' as a last resort.  */
+#ifndef COPYING_UNIT
+#define COPYING_UNIT int
+#endif
+
+
+/* The functions allocating more room by calling `obstack_chunk_alloc'
+   jump to the handler pointed to by `obstack_alloc_failed_handler'.
+   This variable by default points to the internal function
+   `print_and_abort'.  */
+static void print_and_abort (void);
+void (*obstack_alloc_failed_handler) (void) = print_and_abort;
+
+/* Exit value used when `print_and_abort' is used.  */
+#if defined __GNU_LIBRARY__ || defined HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifndef EXIT_FAILURE
+#define EXIT_FAILURE 1
+#endif
+int obstack_exit_failure = EXIT_FAILURE;
+
+/* The non-GNU-C macros copy the obstack into this global variable
+   to avoid multiple evaluation.  */
+
+struct obstack *_obstack;
+
+/* Define a macro that either calls functions with the traditional malloc/free
+   calling interface, or calls functions with the mmalloc/mfree interface
+   (that adds an extra first argument), based on the state of use_extra_arg.
+   For free, do not use ?:, since some compilers, like the MIPS compilers,
+   do not allow (expr) ? void : void.  */
+
+#if defined (__STDC__) && __STDC__
+#define CALL_CHUNKFUN(h, size) \
+  (((h) -> use_extra_arg) \
+   ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
+   : (*(struct _obstack_chunk *(*) (long)) (h)->chunkfun) ((size)))
+
+#define CALL_FREEFUN(h, old_chunk) \
+  do { \
+    if ((h) -> use_extra_arg) \
+      (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
+    else \
+      (*(void (*) (void *)) (h)->freefun) ((old_chunk)); \
+  } while (0)
+#else
+#define CALL_CHUNKFUN(h, size) \
+  (((h) -> use_extra_arg) \
+   ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
+   : (*(struct _obstack_chunk *(*) ()) (h)->chunkfun) ((size)))
+
+#define CALL_FREEFUN(h, old_chunk) \
+  do { \
+    if ((h) -> use_extra_arg) \
+      (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
+    else \
+      (*(void (*) ()) (h)->freefun) ((old_chunk)); \
+  } while (0)
+#endif
+
+
+/* Initialize an obstack H for use.  Specify chunk size SIZE (0 means default).
+   Objects start on multiples of ALIGNMENT (0 means use default).
+   CHUNKFUN is the function to use to allocate chunks,
+   and FREEFUN the function to free them.
+
+   Return nonzero if successful, zero if out of memory.
+   To recover from an out of memory error,
+   free up some memory, then call this again.  */
+
+int
+_obstack_begin (struct obstack *h, int size, int alignment,
+                POINTER (*chunkfun) (long), void (*freefun) (void *))
+{
+  register struct _obstack_chunk *chunk; /* points to new chunk */
+
+  if (alignment == 0)
+    alignment = (int) DEFAULT_ALIGNMENT;
+  if (size == 0)
+    /* Default size is what GNU malloc can fit in a 4096-byte block.  */
+    {
+      /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
+	 Use the values for range checking, because if range checking is off,
+	 the extra bytes won't be missed terribly, but if range checking is on
+	 and we used a larger request, a whole extra 4096 bytes would be
+	 allocated.
+
+	 These number are irrelevant to the new GNU malloc.  I suspect it is
+	 less sensitive to the size of the request.  */
+      int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
+		    + 4 + DEFAULT_ROUNDING - 1)
+		   & ~(DEFAULT_ROUNDING - 1));
+      size = 4096 - extra;
+    }
+
+  h->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun;
+  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
+  h->chunk_size = size;
+  h->alignment_mask = alignment - 1;
+  h->use_extra_arg = 0;
+
+  chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
+  if (!chunk)
+    (*obstack_alloc_failed_handler) ();
+  h->next_free = h->object_base = chunk->contents;
+  h->chunk_limit = chunk->limit
+    = (char *) chunk + h->chunk_size;
+  chunk->prev = 0;
+  /* The initial chunk now contains no empty object.  */
+  h->maybe_empty_object = 0;
+  h->alloc_failed = 0;
+  return 1;
+}
+
+int
+_obstack_begin_1 (struct obstack *h, int size, int alignment,
+                  POINTER (*chunkfun) (POINTER, long),
+                  void (*freefun) (POINTER, POINTER), POINTER arg)
+{
+  register struct _obstack_chunk *chunk; /* points to new chunk */
+
+  if (alignment == 0)
+    alignment = (int) DEFAULT_ALIGNMENT;
+  if (size == 0)
+    /* Default size is what GNU malloc can fit in a 4096-byte block.  */
+    {
+      /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
+	 Use the values for range checking, because if range checking is off,
+	 the extra bytes won't be missed terribly, but if range checking is on
+	 and we used a larger request, a whole extra 4096 bytes would be
+	 allocated.
+
+	 These number are irrelevant to the new GNU malloc.  I suspect it is
+	 less sensitive to the size of the request.  */
+      int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
+		    + 4 + DEFAULT_ROUNDING - 1)
+		   & ~(DEFAULT_ROUNDING - 1));
+      size = 4096 - extra;
+    }
+
+  h->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun;
+  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
+  h->chunk_size = size;
+  h->alignment_mask = alignment - 1;
+  h->extra_arg = arg;
+  h->use_extra_arg = 1;
+
+  chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
+  if (!chunk)
+    (*obstack_alloc_failed_handler) ();
+  h->next_free = h->object_base = chunk->contents;
+  h->chunk_limit = chunk->limit
+    = (char *) chunk + h->chunk_size;
+  chunk->prev = 0;
+  /* The initial chunk now contains no empty object.  */
+  h->maybe_empty_object = 0;
+  h->alloc_failed = 0;
+  return 1;
+}
+
+/* Allocate a new current chunk for the obstack *H
+   on the assumption that LENGTH bytes need to be added
+   to the current object, or a new object of length LENGTH allocated.
+   Copies any partial object from the end of the old chunk
+   to the beginning of the new one.  */
+
+void
+_obstack_newchunk (struct obstack *h, int length)
+{
+  register struct _obstack_chunk *old_chunk = h->chunk;
+  register struct _obstack_chunk *new_chunk;
+  register long	new_size;
+  register long obj_size = h->next_free - h->object_base;
+  register long i;
+  long already;
+
+  /* Compute size for new chunk.  */
+  new_size = (obj_size + length) + (obj_size >> 3) + 100;
+  if (new_size < h->chunk_size)
+    new_size = h->chunk_size;
+
+  /* Allocate and initialize the new chunk.  */
+  new_chunk = CALL_CHUNKFUN (h, new_size);
+  if (!new_chunk)
+    (*obstack_alloc_failed_handler) ();
+  h->chunk = new_chunk;
+  new_chunk->prev = old_chunk;
+  new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size;
+
+  /* Move the existing object to the new chunk.
+     Word at a time is fast and is safe if the object
+     is sufficiently aligned.  */
+  if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT)
+    {
+      for (i = obj_size / sizeof (COPYING_UNIT) - 1;
+	   i >= 0; i--)
+	((COPYING_UNIT *)new_chunk->contents)[i]
+	  = ((COPYING_UNIT *)h->object_base)[i];
+      /* We used to copy the odd few remaining bytes as one extra COPYING_UNIT,
+	 but that can cross a page boundary on a machine
+	 which does not do strict alignment for COPYING_UNITS.  */
+      already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT);
+    }
+  else
+    already = 0;
+  /* Copy remaining bytes one by one.  */
+  for (i = already; i < obj_size; i++)
+    new_chunk->contents[i] = h->object_base[i];
+
+  /* If the object just copied was the only data in OLD_CHUNK,
+     free that chunk and remove it from the chain.
+     But not if that chunk might contain an empty object.  */
+  if (h->object_base == old_chunk->contents && ! h->maybe_empty_object)
+    {
+      new_chunk->prev = old_chunk->prev;
+      CALL_FREEFUN (h, old_chunk);
+    }
+
+  h->object_base = new_chunk->contents;
+  h->next_free = h->object_base + obj_size;
+  /* The new chunk certainly contains no empty object yet.  */
+  h->maybe_empty_object = 0;
+}
+
+/* Return nonzero if object OBJ has been allocated from obstack H.
+   This is here for debugging.
+   If you use it in a program, you are probably losing.  */
+
+/* Suppress -Wmissing-prototypes warning.  We don't want to declare this in
+   obstack.h because it is just for debugging.  */
+int _obstack_allocated_p (struct obstack *h, POINTER obj);
+
+int
+_obstack_allocated_p (struct obstack *h, POINTER obj)
+{
+  register struct _obstack_chunk *lp;	/* below addr of any objects in this chunk */
+  register struct _obstack_chunk *plp;	/* point to previous chunk if any */
+
+  lp = (h)->chunk;
+  /* We use >= rather than > since the object cannot be exactly at
+     the beginning of the chunk but might be an empty object exactly
+     at the end of an adjacent chunk.  */
+  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
+    {
+      plp = lp->prev;
+      lp = plp;
+    }
+  return lp != 0;
+}
+
+/* Free objects in obstack H, including OBJ and everything allocate
+   more recently than OBJ.  If OBJ is zero, free everything in H.  */
+
+#undef obstack_free
+
+/* This function has two names with identical definitions.
+   This is the first one, called from non-ANSI code.  */
+
+void
+_obstack_free (struct obstack *h, POINTER obj)
+{
+  register struct _obstack_chunk *lp;	/* below addr of any objects in this chunk */
+  register struct _obstack_chunk *plp;	/* point to previous chunk if any */
+
+  lp = h->chunk;
+  /* We use >= because there cannot be an object at the beginning of a chunk.
+     But there can be an empty object at that address
+     at the end of another chunk.  */
+  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
+    {
+      plp = lp->prev;
+      CALL_FREEFUN (h, lp);
+      lp = plp;
+      /* If we switch chunks, we can't tell whether the new current
+	 chunk contains an empty object, so assume that it may.  */
+      h->maybe_empty_object = 1;
+    }
+  if (lp)
+    {
+      h->object_base = h->next_free = (char *) (obj);
+      h->chunk_limit = lp->limit;
+      h->chunk = lp;
+    }
+  else if (obj != 0)
+    /* obj is not in any of the chunks! */
+    //abort ();
+    TerminateProcess(GetCurrentProcess(),0xff);
+}
+
+/* This function is used from ANSI code.  */
+
+void
+obstack_free (struct obstack *h, POINTER obj)
+{
+  register struct _obstack_chunk *lp;	/* below addr of any objects in this chunk */
+  register struct _obstack_chunk *plp;	/* point to previous chunk if any */
+
+  lp = h->chunk;
+  /* We use >= because there cannot be an object at the beginning of a chunk.
+     But there can be an empty object at that address
+     at the end of another chunk.  */
+  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
+    {
+      plp = lp->prev;
+      CALL_FREEFUN (h, lp);
+      lp = plp;
+      /* If we switch chunks, we can't tell whether the new current
+	 chunk contains an empty object, so assume that it may.  */
+      h->maybe_empty_object = 1;
+    }
+  if (lp)
+    {
+      h->object_base = h->next_free = (char *) (obj);
+      h->chunk_limit = lp->limit;
+      h->chunk = lp;
+    }
+  else if (obj != 0)
+    /* obj is not in any of the chunks! */
+    abort ();
+    TerminateProcess(GetCurrentProcess(),0xff);
+}
+
+int
+_obstack_memory_used (struct obstack *h)
+{
+  register struct _obstack_chunk* lp;
+  register int nbytes = 0;
+
+  for (lp = h->chunk; lp != 0; lp = lp->prev)
+    {
+      nbytes += lp->limit - (char *) lp;
+    }
+  return nbytes;
+}
+
+/* Define the error handler.  */
+#ifndef _
+# if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
+#  include <libintl.h>
+#  ifndef _
+#   define _(Str) gettext (Str)
+#  endif
+# else
+#  define _(Str) (Str)
+# endif
+#endif
+
+static void
+print_and_abort (void)
+{
+  fputs (_("memory exhausted\n"), stderr);
+  //exit (obstack_exit_failure);
+  ExitProcess(obstack_exit_failure);
+}
+
+#if 0
+/* These are now turned off because the applications do not use it
+   and it uses bcopy via obstack_grow, which causes trouble on sysV.  */
+
+/* Now define the functional versions of the obstack macros.
+   Define them to simply use the corresponding macros to do the job.  */
+
+/* The function names appear in parentheses in order to prevent
+   the macro-definitions of the names from being expanded there.  */
+
+POINTER (obstack_base) (struct obstack *obstack)
+{
+  return obstack_base (obstack);
+}
+
+POINTER (obstack_next_free) (struct obstack *obstack)
+{
+  return obstack_next_free (obstack);
+}
+
+int (obstack_object_size) (struct obstack *obstack)
+{
+  return obstack_object_size (obstack);
+}
+
+int (obstack_room) (struct obstack *obstack)
+{
+  return obstack_room (obstack);
+}
+
+int (obstack_make_room) (struct obstack *obstack, int length)
+{
+  return obstack_make_room (obstack, length);
+}
+
+void (obstack_grow) (struct obstack *obstack, POINTER pointer, int length)
+{
+  obstack_grow (obstack, pointer, length);
+}
+
+void (obstack_grow0) (struct obstack *obstack, POINTER pointer, int length)
+{
+  obstack_grow0 (obstack, pointer, length);
+}
+
+void (obstack_1grow) (struct obstack *obstack, int character)
+{
+  obstack_1grow (obstack, character);
+}
+
+void (obstack_blank) (struct obstack *obstack, int length)
+{
+  obstack_blank (obstack, length);
+}
+
+void (obstack_1grow_fast) (struct obstack *obstack, int character)
+{
+  obstack_1grow_fast (obstack, character);
+}
+
+void (obstack_blank_fast) (struct obstack *obstack, int length)
+{
+  obstack_blank_fast (obstack, length);
+}
+
+POINTER (obstack_finish) (struct obstack *obstack)
+{
+  return obstack_finish (obstack);
+}
+
+POINTER (obstack_alloc) (struct obstack *obstack, int length)
+{
+  return obstack_alloc (obstack, length);
+}
+
+POINTER (obstack_copy) (struct obstack *obstack, POINTER pointer, int length)
+{
+  return obstack_copy (obstack, pointer, length);
+}
+
+POINTER (obstack_copy0) (struct obstack *obstack, POINTER pointer, int length)
+{
+  return obstack_copy0 (obstack, pointer, length);
+}
+
+#endif /* 0 */
+
+#endif	/* !ELIDE_CODE */
Index: libvtv/vtv_fail.cc
===================================================================
--- libvtv/vtv_fail.cc	(Revision 214408)
+++ libvtv/vtv_fail.cc	(Arbeitskopie)
@@ -46,7 +46,11 @@ 
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+
+#if !defined (__CYGWIN__) && !defined (__MINGW32__)
 #include <execinfo.h>
+#endif
+
 #include <unistd.h>
 
 #include "vtv_utils.h"
@@ -102,8 +106,10 @@  log_error_message (const char *log_msg,
     {
 #define STACK_DEPTH 20
       void *callers[STACK_DEPTH];
+#if !defined (__CYGWIN__) && !defined (__MINGW32__)
       int actual_depth = backtrace (callers, STACK_DEPTH);
       backtrace_symbols_fd (callers, actual_depth, vtv_failures_log_fd);
+#endif
     }
 }
 
Index: libvtv/vtv_malloc.cc
===================================================================
--- libvtv/vtv_malloc.cc	(Revision 214408)
+++ libvtv/vtv_malloc.cc	(Arbeitskopie)
@@ -33,7 +33,11 @@ 
 
 #include <stdlib.h>
 #include <unistd.h>
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+#include <windows.h>
+#else
 #include <sys/mman.h>
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -62,6 +66,44 @@  static void *current_chunk VTV_PROTECTED
 static size_t current_chunk_size VTV_PROTECTED_VAR = 0;
 static int malloc_initialized VTV_PROTECTED_VAR = 0;
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+//sysconf(_SC_PAGE_SIZE) port
+long sysconf_SC_PAGE_SIZE()
+{
+  SYSTEM_INFO si;
+  GetSystemInfo(&si);
+  long pageSize = (long)si.dwPageSize;
+  return pageSize;
+  //return 4096; // standard usermode 32bit pagesize in bytes // FIXME
+}
+
+int
+mprotect (void *addr, int len, int prot)
+{
+  DWORD np, op;
+
+  if (prot == 7)
+    np = 0x40;
+  else if (prot == 5)
+    np = 0x20;
+  else if (prot == 4)
+    np = 0x10;
+  else if (prot == 3 || prot == 2)
+    np = 0x04;
+  else if (prot == 1)
+    np = 0x02;
+  else if (prot == 0)
+    np = 0x01;
+  else
+    return -1;
+
+  if (VirtualProtect (addr, len, np, &op))
+    return 0;
+  else
+    return -1;
+}
+#endif
+
 /* The function goes through and counts all the pages we have allocated
    so far.  It returns the page count.  */
 
@@ -162,10 +204,16 @@  obstack_chunk_alloc (size_t size)
   VTV_DEBUG_ASSERT ((size & (VTV_PAGE_SIZE - 1)) == 0);
   void *allocated;
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  if ((allocated = VirtualAlloc(NULL, size,  MEM_RESERVE|MEM_COMMIT,
+                        PAGE_READWRITE)) == 0)
+#else
   if ((allocated = mmap (NULL, size, PROT_READ | PROT_WRITE,
                          MAP_PRIVATE | MAP_ANONYMOUS,  -1, 0)) == 0)
+#endif
     VTV_error ();
 
+
   VTV_DEBUG_ASSERT (((unsigned long) allocated & (VTV_PAGE_SIZE - 1)) == 0);
 
   current_chunk = allocated;
@@ -190,7 +238,11 @@  __vtv_malloc_init (void)
   if (malloc_initialized)
     return;
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  if (VTV_PAGE_SIZE != sysconf_SC_PAGE_SIZE())
+#else
   if (VTV_PAGE_SIZE != sysconf (_SC_PAGE_SIZE))
+#endif
     VTV_error ();
 
   obstack_chunk_size (&vtv_obstack) = VTV_PAGE_SIZE;
Index: libvtv/vtv_malloc.h
===================================================================
--- libvtv/vtv_malloc.h	(Revision 214408)
+++ libvtv/vtv_malloc.h	(Arbeitskopie)
@@ -95,4 +95,12 @@  extern void __vtv_malloc_stats (void);
 extern void __vtv_malloc_dump_stats (void);
 extern int __vtv_count_mmapped_pages (void);
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+int
+mprotect (void *addr, int len, int prot);
+
+  #define PROT_READ 0x1
+  #define PROT_WRITE 0x2
+#endif
+
 #endif /* vtv_malloc.h */
Index: libvtv/vtv_map.h
===================================================================
--- libvtv/vtv_map.h	(Revision 214408)
+++ libvtv/vtv_map.h	(Arbeitskopie)
@@ -26,7 +26,13 @@ 
 #define _VTV_MAP_H 1
 
 #include <string.h>
+
+#ifdef __MINGW32__
+#include <stdint.h>
+#include "vtv_utils.h"
+#else
 #include <vtv_utils.h>
+#endif
 
 inline uint64_t
 load8bytes (const void *p)
Index: libvtv/vtv_rts.cc
===================================================================
--- libvtv/vtv_rts.cc	(Revision 214408)
+++ libvtv/vtv_rts.cc	(Arbeitskopie)
@@ -121,12 +121,20 @@ 
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+#include <windows.h>
+#include <winternl.h>
+#include <psapi.h>
+#else
 #include <execinfo.h>
+#endif
 
 #include <unistd.h>
+#if !defined (__CYGWIN__) && !defined (__MINGW32__)
 #include <sys/mman.h>
-#include <errno.h>
 #include <link.h>
+#endif
+#include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 
@@ -143,6 +151,13 @@ 
 
 #include "vtv-change-permission.h"
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+// porting: fix link error to libc
+void __fortify_fail (const char * msg){
+    OutputDebugString(msg);
+    abort();
+}
+#else
 extern "C" {
 
   /* __fortify_fail is a function in glibc that calls __libc_message,
@@ -159,6 +174,7 @@  extern "C" {
   extern void __fortify_fail (const char *) __attribute__((noreturn));
 
 } /* extern "C" */
+#endif
 
 /* The following variables are used only for debugging and performance
    tuning purposes. Therefore they do not need to be "protected".
@@ -313,10 +329,17 @@  typedef vtv_set_handle * vtv_set_handle_
 
 struct sect_hdr_data
 {
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  uintptr_t dlpi_addr;    /* The header address in the INFO record,
+                            passed in from dl_iterate_phdr.  */
+  uintptr_t mp_low;       /* Start address of the .vtable_map_vars
+                            section in memory.  */
+#else
   ElfW (Addr) dlpi_addr; /* The header address in the INFO record,
                             passed in from dl_iterate_phdr.  */
   ElfW (Addr) mp_low;    /* Start address of the .vtable_map_vars
                             section in memory.  */
+#endif
   size_t mp_size;        /* Size of the .vtable_map_vars section in
                             memory.  */
 };
@@ -336,8 +359,13 @@  unsigned int num_cache_entries VTV_PROTE
    it returns the record for that entry; otherwise it returns
    NULL.  */
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+struct sect_hdr_data *
+search_cached_file_data (uintptr_t load_addr)
+#else
 struct sect_hdr_data *
 search_cached_file_data (ElfW (Addr) load_addr)
+#endif
 {
   unsigned int i;
   for (i = 0; i < num_cache_entries; ++i)
@@ -401,6 +429,122 @@  log_memory_protection_data (char *messag
   __vtv_add_to_log (log_fd, "%s", message);
 }
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+static void
+read_section_offset_and_length (char *name,
+                                uintptr_t addr,
+                                const char *sect_name,
+                                int mprotect_flags,
+                                off_t *sect_offset,
+                                WORD *sect_len)
+{
+  bool found = false;
+  struct sect_hdr_data *cached_data = NULL;
+
+  /* Check to see if we already have the data for this file.  */
+  cached_data = search_cached_file_data (addr);
+
+  if (cached_data)
+    {
+      *sect_offset = cached_data->mp_low;
+      *sect_len = cached_data->mp_size;
+      return;
+    }
+
+  // check for DOS Header magic bytes
+  if (*(WORD *)addr == 0x5A4D)
+    {
+      int name_len = strlen (sect_name);
+      int fd = -1;
+
+      /* Attempt to open the binary file on disk.  */
+      if (strlen (name) == 0)
+        {
+          return;
+        }
+      else
+        fd = open (name, O_RDONLY | O_BINARY);
+
+      if (fd != -1)
+        {
+          /* Find the section header information in memory.  */
+          PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)addr;
+          PIMAGE_NT_HEADERS pNtHeaders = (PIMAGE_NT_HEADERS)((char *)addr + pDosHeader->e_lfanew);
+          PIMAGE_FILE_HEADER pFileHeader = &pNtHeaders->FileHeader;
+
+          DWORD PointerToStringTable = pFileHeader->PointerToSymbolTable + (pFileHeader->NumberOfSymbols*0x12);
+
+          PIMAGE_SECTION_HEADER sect_hdr = (PIMAGE_SECTION_HEADER)((char *)&pNtHeaders->OptionalHeader
+                                                               + pFileHeader->SizeOfOptionalHeader);
+
+          /* Loop through all the section headers, looking for one whose
+             name is ".vtable_map_vars".  */
+
+          for (int i = 0; i < pFileHeader->NumberOfSections && !found; ++i)
+            {
+              char header_name[64];
+
+              // Check if we have to get the section name from the COFF string table.
+              if (sect_hdr[i].Name[0] == '/')
+                {
+                  if (atoi((const char*)sect_hdr[i].Name+1) == 0)
+                    {
+                      continue;
+                    }
+
+                  off_t name_offset = PointerToStringTable + atoi((const char*)sect_hdr[i].Name+1);
+
+                  size_t bytes_read = ReadFromOffset (fd, &header_name, 64, name_offset);
+
+                  VTV_ASSERT (bytes_read > 0);
+                }
+              else
+                {
+                  memcpy (&header_name, sect_hdr[i].Name, sizeof (sect_hdr[i].Name));
+                }
+
+              if (memcmp (header_name, sect_name, name_len) == 0)
+                {
+                  /* We found the section; get its load offset and
+                     size.  */
+                  *sect_offset = sect_hdr[i].VirtualAddress;
+      if (sect_hdr[i].Misc.VirtualSize % VTV_PAGE_SIZE != 0)
+        *sect_len = sect_hdr[i].Misc.VirtualSize + VTV_PAGE_SIZE - (sect_hdr[i].Misc.VirtualSize % VTV_PAGE_SIZE);
+      else
+        *sect_len = sect_hdr[i].Misc.VirtualSize;
+                  found = true;
+                }
+            }
+          close (fd);
+        }
+    }
+
+  if (*sect_offset != 0 && *sect_len != 0)
+    {
+      /* Calculate the page location in memory, making sure the
+         address is page-aligned.  */
+      uintptr_t start_addr = addr + *sect_offset;
+      *sect_offset = start_addr & ~(VTV_PAGE_SIZE - 1);
+      *sect_len = *sect_len - 1;
+
+      /* Since we got this far, we must not have found these pages in
+         the cache, so add them to it.  NOTE: We could get here either
+         while making everything read-only or while making everything
+         read-write.  We will only update the cache if we get here on
+         a read-write (to make absolutely sure the cache is writable
+         -- also the read-write pass should come before the read-only
+         pass).  */
+      if ((mprotect_flags & PROT_WRITE)
+          && num_cache_entries < MAX_ENTRIES)
+        {
+          vtv_sect_info_cache[num_cache_entries].dlpi_addr = addr;
+          vtv_sect_info_cache[num_cache_entries].mp_low = *sect_offset;
+          vtv_sect_info_cache[num_cache_entries].mp_size = *sect_len;
+          num_cache_entries++;
+        }
+    }
+}
+#else
 static void
 read_section_offset_and_length (struct dl_phdr_info *info,
                                 const char *sect_name,
@@ -547,7 +691,110 @@  read_section_offset_and_length (struct d
         }
     }
 }
+#endif
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+static int
+iterate_modules (void *data)
+{
+  int * mprotect_flags = (int *) data;
+  off_t map_sect_offset = 0;
+  WORD map_sect_len = 0;
+  char buffer[1024];
+  const char *map_sect_name = VTV_PROTECTED_VARS_SECTION;
+  HMODULE hMods[1024];
+  HANDLE hProcess;
+  DWORD cbNeeded;
+
+  hProcess = GetCurrentProcess ();
+
+  if (NULL == hProcess)
+    return 0;
+
+  if (EnumProcessModules (hProcess, hMods, sizeof (hMods), &cbNeeded))
+    {
+      /* Iterate over all loaded modules. */
+      for (unsigned int i = 0; i < (cbNeeded / sizeof (HMODULE)); i++)
+        {
+          char szModName[MAX_PATH];
+
+          if (GetModuleFileNameExA (hProcess, hMods[i], szModName,
+                        sizeof (szModName)))
+            {
+              map_sect_offset = 0;
+              map_sect_len = 0;
+              read_section_offset_and_length (szModName, (uintptr_t) hMods[i], map_sect_name, *mprotect_flags,
+                &map_sect_offset, &map_sect_len);
+
+              if (debug_functions)
+                {
+                  snprintf (buffer, sizeof(buffer),
+                "  Looking at load module %s to change permissions to %s\n",
+                szModName,
+                (*mprotect_flags & PROT_WRITE) ? "READ/WRITE" : "READ-ONLY");
+                  log_memory_protection_data (buffer);
+                }
+
+              /* See if we actually found the section.  */
+              if (map_sect_offset && map_sect_len)
+                {
+                  unsigned long long start;
+                  int result;
+
+                  if (debug_functions)
+                    {
+                      snprintf (buffer, sizeof (buffer),
+                                "  (%s): Protecting %p to %p\n",
+                                szModName,
+                                (void *) map_sect_offset,
+                                (void *) (map_sect_offset + map_sect_len));
+                      log_memory_protection_data (buffer);
+                    }
+
+                  /* Change the protections on the pages for the section.  */
+
+                  start = get_cycle_count ();
+                  result = mprotect ((void *) map_sect_offset, map_sect_len,
+                                     *mprotect_flags);
+                  accumulate_cycle_count (&mprotect_cycles, start);
+                  if (result == -1)
+                    {
+                      if (debug_functions)
+                        {
+                          snprintf (buffer, sizeof (buffer),
+                                    "Failed called to mprotect for %s error: ",
+                                    (*mprotect_flags & PROT_WRITE) ?
+                                    "READ/WRITE" : "READ-ONLY");
+                          log_memory_protection_data (buffer);
+                          perror(NULL);
+                        }
+                      VTV_error();
+                    }
+                  else
+                    {
+                      if (debug_functions)
+                       {
+                          snprintf (buffer, sizeof (buffer),
+                                    "mprotect'ed range [%p, %p]\n",
+                                    (void *) map_sect_offset,
+                                    (char *) map_sect_offset + map_sect_len);
+                          log_memory_protection_data (buffer);
+                        }
+                    }
+                  increment_num_calls (&num_calls_to_mprotect);
+                  /* num_pages_protected += (map_sect_len + VTV_PAGE_SIZE - 1) / VTV_PAGE_SIZE; */
+                  num_pages_protected += (map_sect_len + 4096 - 1) / 4096;
+                  continue;
+                }
+            }
+        }
+    }
+
+    CloseHandle(hProcess);
+
+  return 0;
+}
+#else
 /* This is the callback function used by dl_iterate_phdr (which is
    called from vtv_unprotect_vtable_vars and vtv_protect_vtable_vars).
    It attempts to find the binary file on disk for the INFO record
@@ -652,6 +899,7 @@  dl_iterate_phdr_callback (struct dl_phdr
 
   return 0;
 }
+#endif
 
 /* This function explicitly changes the protection (read-only or read-write)
    on the vtv_sect_info_cache, which is used for speeding up look ups in the
@@ -678,7 +926,7 @@  change_protections_on_phdr_cache (int pr
   char * low_address = (char *) &(vtv_sect_info_cache);
   size_t cache_size = MAX_ENTRIES * sizeof (struct sect_hdr_data);
 
-  low_address = (char *) ((unsigned long) low_address & ~(VTV_PAGE_SIZE - 1));
+  low_address = (char *) ((uintptr_t) low_address & ~(VTV_PAGE_SIZE - 1));
   
   if (mprotect ((void *) low_address, cache_size, protection_flag) == -1)
     VTV_error ();
@@ -695,7 +943,11 @@  vtv_unprotect_vtable_vars (void)
 
   mprotect_flags = PROT_READ | PROT_WRITE;
   change_protections_on_phdr_cache (mprotect_flags);
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  iterate_modules ((void *) &mprotect_flags);
+#else
   dl_iterate_phdr (dl_iterate_phdr_callback, (void *) &mprotect_flags);
+#endif
 }
 
 /* Protect all the vtable map vars and other side data that is used
@@ -708,7 +960,11 @@  vtv_protect_vtable_vars (void)
   int mprotect_flags;
 
   mprotect_flags = PROT_READ;
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  iterate_modules ((void *) &mprotect_flags);
+#else
   dl_iterate_phdr (dl_iterate_phdr_callback, (void *) &mprotect_flags);
+#endif
   change_protections_on_phdr_cache (mprotect_flags);
 }
 
@@ -868,7 +1124,7 @@  const unsigned long SET_HANDLE_HANDLE_BI
 static inline bool
 is_set_handle_handle (void * ptr)
 {
-  return ((unsigned long) ptr & SET_HANDLE_HANDLE_BIT)
+  return ((uintptr_t) ptr & SET_HANDLE_HANDLE_BIT)
                                                       == SET_HANDLE_HANDLE_BIT;
 }
 
@@ -878,7 +1134,7 @@  is_set_handle_handle (void * ptr)
 static inline vtv_set_handle * 
 ptr_from_set_handle_handle (void * ptr)
 {
-  return (vtv_set_handle *) ((unsigned long) ptr & ~SET_HANDLE_HANDLE_BIT);
+  return (vtv_set_handle *) ((uintptr_t) ptr & ~SET_HANDLE_HANDLE_BIT);
 }
 
 /* Given a vtable map variable, PTR, this function sets the bit that
@@ -888,7 +1144,7 @@  ptr_from_set_handle_handle (void * ptr)
 static inline vtv_set_handle_handle
 set_handle_handle (vtv_set_handle * ptr)
 {
-  return (vtv_set_handle_handle) ((unsigned long) ptr | SET_HANDLE_HANDLE_BIT);
+  return (vtv_set_handle_handle) ((uintptr_t) ptr | SET_HANDLE_HANDLE_BIT);
 }
 
 static inline void
@@ -1362,6 +1618,7 @@  __VLTVerifyVtablePointer (void ** set_ha
 
 static int page_count_2 = 0;
 
+#if !defined (__CYGWIN__) && !defined (__MINGW32__)
 static int
 dl_iterate_phdr_count_pages (struct dl_phdr_info *info,
                              size_t unused __attribute__ ((__unused__)),
@@ -1392,6 +1649,7 @@  dl_iterate_phdr_count_pages (struct dl_p
 
   return 0;
 }
+#endif
 
 static void
 count_all_pages (void)
@@ -1401,7 +1659,11 @@  count_all_pages (void)
   mprotect_flags = PROT_READ;
   page_count_2 = 0;
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  iterate_modules ((void *) &mprotect_flags);
+#else
   dl_iterate_phdr (dl_iterate_phdr_count_pages, (void *) &mprotect_flags);
+#endif
   page_count_2 += __vtv_count_mmapped_pages ();
 }
 
Index: libvtv/vtv_utils.cc
===================================================================
--- libvtv/vtv_utils.cc	(Revision 214408)
+++ libvtv/vtv_utils.cc	(Arbeitskopie)
@@ -33,7 +33,12 @@ 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+#include <windows.h>
+#else
 #include <execinfo.h>
+#endif
+
 #include <unistd.h>
 #include <errno.h>
 
@@ -64,8 +69,12 @@  __vtv_open_log (const char *name)
 {
   char log_name[1024];
   char log_dir[512];
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  pid_t process_id = GetCurrentProcessId ();
+#else
   uid_t user_id = getuid ();
   pid_t process_id = getpid ();
+#endif
   char *logs_prefix;
   bool logs_dir_specified = false;
   int fd = -1;
@@ -74,14 +83,29 @@  __vtv_open_log (const char *name)
   if (logs_prefix && strlen (logs_prefix) > 0)
     {
       logs_dir_specified = true;
+#ifdef __MINGW32__
+      mkdir (logs_prefix);
+#else
       mkdir (logs_prefix, S_IRWXU);
+#endif
+
       snprintf (log_dir, sizeof (log_dir), "%s/vtv_logs", logs_prefix);
-      mkdir (log_dir, S_IRWXU);
 
+#ifdef __MINGW32__
+      mkdir (logs_prefix);
+#else
+      mkdir (logs_prefix, S_IRWXU);
+#endif
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+      snprintf (log_name, sizeof (log_name), "%s_%d_%s", log_dir,
+		(unsigned) process_id, name);
+      fd = open (log_name, O_WRONLY | O_APPEND | O_CREAT, S_IRWXU);
+#else
       snprintf (log_name, sizeof (log_name), "%s/%d_%d_%s", log_dir,
 		(unsigned) user_id, (unsigned) process_id, name);
       fd = open (log_name, O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW,
 		 S_IRWXU);
+#endif
     }
   else
     fd = dup (2);
@@ -125,8 +149,12 @@  __vtv_add_to_log (int log_file, const ch
   va_list ap;
   va_start (ap, format);
 
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+  snprintf (output, sizeof (output), "VTV: PID=%ld ", GetCurrentProcessId ());
+#else
   snprintf (output, sizeof (output), "VTV: PID=%d PPID=%d ", getpid (),
             getppid ());
+#endif
   vtv_log_write (log_file, output);
   vsnprintf (output, sizeof (output), format, ap);
   vtv_log_write (log_file, output);
@@ -151,6 +179,7 @@  __vtv_log_verification_failure (const ch
 
   __vtv_add_to_log (vtv_failures_log_fd, "%s", log_msg);
 
+#if !defined (__CYGWIN__) && !defined (__MINGW32__)
   if (generate_backtrace)
     {
 #define STACK_DEPTH 20
@@ -158,4 +187,5 @@  __vtv_log_verification_failure (const ch
       int actual_depth = backtrace (callers, STACK_DEPTH);
       backtrace_symbols_fd (callers, actual_depth, vtv_failures_log_fd);
     }
+#endif
 }