@@ -5003,18 +5003,41 @@ elf64) elfsize=64 ;;
esac
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
- ALLOC_FILE=alloc.lo
- AC_SUBST(ALLOC_FILE)
- VIEW_FILE=read.lo
- AC_SUBST(VIEW_FILE)
-
AC_MSG_CHECKING([whether to build libbacktrace support])
if test "$enable_libstdcxx_backtrace" == "auto"; then
enable_libstdcxx_backtrace=no
fi
if test "$enable_libstdcxx_backtrace" == "yes"; then
BACKTRACE_SUPPORTED=1
- BACKTRACE_USES_MALLOC=1
+
+ AC_CHECK_HEADERS(sys/mman.h)
+ case "${host}" in
+ *-*-msdosdjgpp) # DJGPP has sys/man.h, but no mmap
+ have_mmap=no ;;
+ *-*-*)
+ have_mmap="$ac_cv_header_sys_mman_h" ;;
+ esac
+
+ if test "$have_mmap" = "no"; then
+ VIEW_FILE=read.lo
+ ALLOC_FILE=alloc.lo
+ else
+ VIEW_FILE=mmapio.lo
+ AC_PREPROC_IFELSE([AC_LANG_SOURCE([
+ #include <sys/mman.h>
+ #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
+ #error no MAP_ANONYMOUS
+ #endif
+ ])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
+ fi
+ AC_SUBST(VIEW_FILE)
+ AC_SUBST(ALLOC_FILE)
+
+ BACKTRACE_USES_MALLOC=0
+ if test "$ALLOC_FILE" = "alloc.lo"; then
+ BACKTRACE_USES_MALLOC=1
+ fi
+
if test "$ac_has_gthreads" = "yes"; then
BACKTRACE_SUPPORTS_THREADS=1
else
@@ -420,6 +420,9 @@
/* Define to 1 if you have the <sys/machine.h> header file. */
#undef HAVE_SYS_MACHINE_H
+/* Define to 1 if you have the <sys/mman.h> header file. */
+#undef HAVE_SYS_MMAN_H
+
/* Define to 1 if you have the <sys/param.h> header file. */
#undef HAVE_SYS_PARAM_H
@@ -681,8 +681,8 @@ BACKTRACE_SUPPORTS_THREADS
BACKTRACE_USES_MALLOC
BACKTRACE_SUPPORTED
BACKTRACE_CPPFLAGS
-VIEW_FILE
ALLOC_FILE
+VIEW_FILE
FORMAT_FILE
ENABLE_FILESYSTEM_TS_FALSE
ENABLE_FILESYSTEM_TS_TRUE
@@ -16190,7 +16190,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
ac_save_CXXFLAGS="$CXXFLAGS"
- cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
@@ -77463,11 +77463,6 @@ elf64) elfsize=64 ;;
esac
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
- ALLOC_FILE=alloc.lo
-
- VIEW_FILE=read.lo
-
-
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build libbacktrace support" >&5
$as_echo_n "checking whether to build libbacktrace support... " >&6; }
if test "$enable_libstdcxx_backtrace" == "auto"; then
@@ -77475,7 +77470,55 @@ $as_echo_n "checking whether to build libbacktrace support... " >&6; }
fi
if test "$enable_libstdcxx_backtrace" == "yes"; then
BACKTRACE_SUPPORTED=1
- BACKTRACE_USES_MALLOC=1
+
+ for ac_header in sys/mman.h
+do :
+ ac_fn_c_check_header_mongrel "$LINENO" "sys/mman.h" "ac_cv_header_sys_mman_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_mman_h" = xyes; then :
+ cat >>confdefs.h <<_ACEOF
+#define HAVE_SYS_MMAN_H 1
+_ACEOF
+
+fi
+
+done
+
+ case "${host}" in
+ *-*-msdosdjgpp) # DJGPP has sys/man.h, but no mmap
+ have_mmap=no ;;
+ *-*-*)
+ have_mmap="$ac_cv_header_sys_mman_h" ;;
+ esac
+
+ if test "$have_mmap" = "no"; then
+ VIEW_FILE=read.lo
+ ALLOC_FILE=alloc.lo
+ else
+ VIEW_FILE=mmapio.lo
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+ #include <sys/mman.h>
+ #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
+ #error no MAP_ANONYMOUS
+ #endif
+
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+ ALLOC_FILE=mmap.lo
+else
+ ALLOC_FILE=alloc.lo
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+ fi
+
+
+
+ BACKTRACE_USES_MALLOC=0
+ if test "$ALLOC_FILE" = "alloc.lo"; then
+ BACKTRACE_USES_MALLOC=1
+ fi
+
if test "$ac_has_gthreads" = "yes"; then
BACKTRACE_SUPPORTS_THREADS=1
else