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Ensure the linker supports @unwind sections in libffi. From Mozilla bug 756740.

Browse Source 
https://bugzilla.mozilla.org/show_bug.cgi?id=778414

Also tracked as issue #42.
https://github.com/atgreen/libffi/issues/42
This commit is contained in:
Ryan VanderMeulen
2014-03-10 14:53:48 -04:00
parent 634a475eaf
commit dfa3738732
2 changed files with 26 additions and 6 deletions
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4
ChangeLog
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@@ -1,3 +1,7 @@
2014-03-10 Landry Breuil <landry@openbsd.org>
* configure.ac: Ensure the linker supports @unwind sections in libffi.
2014-03-01 Anthony Green <green@moxielogic.com> 2014-03-01 Anthony Green <green@moxielogic.com>
* Makefile.am (EXTRA_DIST): Replace old scripts with * Makefile.am (EXTRA_DIST): Replace old scripts with

28
configure.ac
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@@ -215,7 +215,7 @@ case "$host" in
mips-sgi-irix5.* | mips-sgi-irix6.* | mips*-*-rtems*) mips-sgi-irix5.* | mips-sgi-irix6.* | mips*-*-rtems*)
TARGET=MIPS; TARGETDIR=mips TARGET=MIPS; TARGETDIR=mips
;; ;;
mips*-*-linux* | mips*-*-openbsd*) mips*-*linux* | mips*-*-openbsd*)
# Support 128-bit long double for NewABI. # Support 128-bit long double for NewABI.
HAVE_LONG_DOUBLE='defined(__mips64)' HAVE_LONG_DOUBLE='defined(__mips64)'
TARGET=MIPS; TARGETDIR=mips TARGET=MIPS; TARGETDIR=mips
@@ -460,12 +460,28 @@ AM_CONDITIONAL(FFI_EXEC_TRAMPOLINE_TABLE, test x$FFI_EXEC_TRAMPOLINE_TABLE = x1)
AC_SUBST(FFI_EXEC_TRAMPOLINE_TABLE) AC_SUBST(FFI_EXEC_TRAMPOLINE_TABLE)
if test x$TARGET = xX86_64; then if test x$TARGET = xX86_64; then
AC_CACHE_CHECK([assembler supports unwind section type], AC_CACHE_CHECK([toolchain supports unwind section type],
libffi_cv_as_x86_64_unwind_section_type, [ libffi_cv_as_x86_64_unwind_section_type, [
libffi_cv_as_x86_64_unwind_section_type=yes cat > conftest1.s << EOF
echo '.section .eh_frame,"a",@unwind' > conftest.s .text
if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then .globl foo
libffi_cv_as_x86_64_unwind_section_type=no foo:
jmp bar
.section .eh_frame,"a",@unwind
bar:
EOF
cat > conftest2.c << EOF
extern void foo();
int main(){foo();}
EOF
libffi_cv_as_x86_64_unwind_section_type=no
# we ensure that we can compile _and_ link an assembly file containing an @unwind section
# since the compiler can support it and not the linker (ie old binutils)
if $CC -Wa,--fatal-warnings $CFLAGS -c conftest1.s > /dev/null 2>&1 && \
$CC conftest2.c conftest1.o > /dev/null 2>&1 ; then
libffi_cv_as_x86_64_unwind_section_type=yes
fi fi
]) ])
if test "x$libffi_cv_as_x86_64_unwind_section_type" = xyes; then if test "x$libffi_cv_as_x86_64_unwind_section_type" = xyes; then