diff options
| author | Anthony Green <green@moxielogic.com> | 2014-03-14 16:54:31 -0400 |
|---|---|---|
| committer | Anthony Green <green@moxielogic.com> | 2014-03-14 16:54:31 -0400 |
| commit | 76d19d004e36e99d261ee78261e2f52cea5e4ab1 (patch) | |
| tree | f640032426977072a14bd33fd9e90cb27080eff9 /configure.ac | |
| parent | c86d9b6cc6e16ee262844a33b40441374400758c (diff) | |
| parent | a1a6f71bfe4199293043b2e4cfb4c8d3cb1112f9 (diff) | |
| download | libffi-76d19d004e36e99d261ee78261e2f52cea5e4ab1.tar.gz | |
Ensure the linker supports @unwind sections in libffi.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac index bf003fa..90a11f6 100644 --- a/configure.ac +++ b/configure.ac @@ -460,12 +460,28 @@ AM_CONDITIONAL(FFI_EXEC_TRAMPOLINE_TABLE, test x$FFI_EXEC_TRAMPOLINE_TABLE = x1) AC_SUBST(FFI_EXEC_TRAMPOLINE_TABLE) if test x$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=yes - echo '.section .eh_frame,"a",@unwind' > conftest.s - if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then - libffi_cv_as_x86_64_unwind_section_type=no + cat > conftest1.s << EOF +.text +.globl foo +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 && \ + $CC conftest2.c conftest1.o > /dev/null 2>&1 ; then + libffi_cv_as_x86_64_unwind_section_type=yes fi ]) if test "x$libffi_cv_as_x86_64_unwind_section_type" = xyes; then |