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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2013-10-02 17:30:07 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2013-10-02 17:30:07 +0000 |
| commit | cc1a9ac808c9f04cb0deeff138b5da114f113c76 (patch) | |
| tree | 624e4795d248327ef48a277a8b18931e053892e9 /libgo/configure.ac | |
| parent | 78cedfb1a3f33be3d2230c6be1dbc27ba642d9b5 (diff) | |
| download | gcc-cc1a9ac808c9f04cb0deeff138b5da114f113c76.zip gcc-cc1a9ac808c9f04cb0deeff138b5da114f113c76.tar.gz gcc-cc1a9ac808c9f04cb0deeff138b5da114f113c76.tar.bz2 | |
reflect: Use hand-coded .eh_frame section rather than CFI directives.
From Rainer Orth.
From-SVN: r203120
Diffstat (limited to 'libgo/configure.ac')
| -rw-r--r-- | libgo/configure.ac | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/libgo/configure.ac b/libgo/configure.ac index 002aa88..ef5ea839 100644 --- a/libgo/configure.ac +++ b/libgo/configure.ac @@ -757,6 +757,68 @@ if test "$libgo_cv_lib_setcontext_clobbers_tls" = "yes"; then [Define if setcontext clobbers TLS variables]) fi +AC_CACHE_CHECK([whether .eh_frame section should be read-only], +libgo_cv_ro_eh_frame, [ +libgo_cv_ro_eh_frame=no +echo 'extern void foo (void); void bar (void) { foo (); foo (); }' > conftest.c +if $CC $CFLAGS -S -fpic -fexceptions -o conftest.s conftest.c > /dev/null 2>&1; then + if grep '.section.*eh_frame.*"a"' conftest.s > /dev/null; then + libgo_cv_ro_eh_frame=yes + elif grep '.section.*eh_frame.*#alloc' conftest.c \ + | grep -v '#write' > /dev/null; then + libgo_cv_ro_eh_frame=yes + fi +fi +rm -f conftest.* +]) +if test "x$libgo_cv_ro_eh_frame" = xyes; then + AC_DEFINE(EH_FRAME_FLAGS, "a", + [Define to the flags needed for the .section .eh_frame directive.]) +else + AC_DEFINE(EH_FRAME_FLAGS, "aw", + [Define to the flags needed for the .section .eh_frame directive.]) +fi + +AC_CACHE_CHECK([if assembler supports GNU comdat group syntax], +libgo_cv_as_comdat_gnu, [ +echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s +if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then + libgo_cv_as_comdat_gnu=yes +else + libgo_cv_as_comdat_gnu=no +fi +]) +if test "x$libgo_cv_as_comdat_gnu" = xyes; then + AC_DEFINE(HAVE_AS_COMDAT_GAS, 1, + [Define if your assembler supports GNU comdat group syntax.]) +fi + +AC_CACHE_CHECK([assembler supports pc related relocs], +libgo_cv_as_x86_pcrel, [ +libgo_cv_as_x86_pcrel=yes +echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s +if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then + libgo_cv_as_x86_pcrel=no +fi +]) +if test "x$libgo_cv_as_x86_pcrel" = xyes; then + AC_DEFINE(HAVE_AS_X86_PCREL, 1, + [Define if your assembler supports PC relative relocs.]) +fi + +AC_CACHE_CHECK([assembler supports unwind section type], +libgo_cv_as_x86_64_unwind_section_type, [ +libgo_cv_as_x86_64_unwind_section_type=yes +echo '.section .eh_frame,"a",@unwind' > conftest.s +if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then + libgo_cv_as_x86_64_unwind_section_type=no +fi +]) +if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then + AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1, + [Define if your assembler supports unwind section type.]) +fi + AC_CACHE_SAVE if test ${multilib} = yes; then |