diff mbox

[1-3] New configure options that make the compiler use -fPIE and -pie as default option

Message ID 4827012.p4mTkPPu1h@laptop1.gw.ume.nu
State New
Headers show

Commit Message

Magnus Granberg July 31, 2014, 8:06 p.m. UTC 
Hi
This patchset will add a new configure options --enable-default-pie.
With the new option enable will make it pass -fPIE and -pie from the gcc and 
g++ frontend. Have only add the support for two targets but should work on
more targes. In configure.ac we add the new option. We can't compile the 
compiler or the crt stuff with -fPIE it will brake the PCH and the crtbegin and
crtend files. The disabling is done in the Makefiles. The needed spec is added 
to DRIVER_SELF_SPECS. We disable all the profiling test for the linking will 
fail. Tested on x86_64 linux (Gentoo).

More and more Linux/gnu distributions compile binary with PIE with this you
could allmost compile all binary with PIE as we do on Gentoo Hardened.
This patches have bin posted before on the list.
https://gcc.gnu.org/ml/gcc-patches/2013-11/msg01515.html


/Magnus Granberg

Changlog

2014-07-31  Magnus Granberg  <zorry@gentoo.org>

	/gcc
	* config/gnu-user.h: Define PIE_DRIVER_SELF_SPECS for PIE 
	as default and GNU_DRIVER_SELF_SPECS.
	* config/i386/gnu-user-common.h: Define DRIVER_SELF_SPECS
	* configure.ac: Add new option that enable PIE as default.
	* configure, config.in: Rebuild.
	* Makefile.in: Disable PIE when building the compiler.
	* doc/install.texi: Add the new configure option default PIE.
	* doc/invoke.texi: Add note for the new configure option default PIE.
	* testsuite/gcc/default-pie.c: New test for new configure option
	--enale-default-pie
	* testsuite/gcc.dg/other/anon5.C: Add skip test as it fail to link
	on effective_target default_pie.
	* testsuite/lib/target-supports.exp (check_profiling_available):
	We can't use profiling on effective target default_pie. 
	(check_effective_target_pie): Add check_effective_target_default_pie.

	/libgcc
	* Makefile.in: Disable PIE when building the crtbegin/end files.

----
diff mbox

Patch

--- a/gcc/doc/install.texi	2013-10-01 19:29:40.000000000 +0200
+++ b/gcc/doc/install.texi	2013-11-17 16:13:20.474144921 +0100
@@ -1455,6 +1455,10 @@  do a @samp{make -C gcc gnatlib_and_tools
 Specify that the run-time libraries for stack smashing protection
 should not be built.
 
+@item --enable-default-pie
+Turn on @option{-fPIE} and @option{-pie} by default if supported.
+Currently supported targets are i?86-*-linux* and x86-64-*-linux*.
+
 @item --disable-libquadmath
 Specify that the GCC quad-precision math library should not be built.
 On some systems, the library is required to be linkable when building
--- a/gcc/doc/invoke.texi	2013-10-03 19:13:50.000000000 +0200
+++ b/gcc/doc/invoke.texi	2013-11-17 21:30:02.784220111 +0100
@@ -10535,6 +10535,12 @@  For predictable results, you must also s
 used for compilation (@option{-fpie}, @option{-fPIE},
 or model suboptions) when you specify this linker option.
 
+NOTE: With configure --enable-default-pie this option is enabled by default
+for C, C++, ObjC, ObjC++, if none of @option{-fno-PIE}, @option{-fno-pie},
+@option{-fPIC}, @option{-fpic}, @option{-fno-PIC}, @option{-fno-pic},
+@option{-nostdlib}, @option{-nostartfiles}, @option{-shared},
+@option{-nodefaultlibs}, nor @option{static} are found.
+
 @item -rdynamic
 @opindex rdynamic
 Pass the flag @option{-export-dynamic} to the ELF linker, on targets
@@ -22476,6 +22476,12 @@  used during linking.
 @code{__pie__} and @code{__PIE__}.  The macros have the value 1
 for @option{-fpie} and 2 for @option{-fPIE}.
 
+NOTE: With configure --enable-default-pie this option is enabled by default
+for C, C++, ObjC, ObjC++, if none of @option{-fno-PIE}, @option{-fno-pie},
+@option{-fPIC}, @option{-fpic}, @option{-fno-PIC}, @option{-fno-pic},
+@option{-nostdlib}, @option{-nostartfiles}, @option{-shared},
+@option{-nodefaultlibs}, nor @option{static} are found.
+
 @item -fno-jump-tables
 @opindex fno-jump-tables
 Do not use jump tables for switch statements even where it would be