* configure.ac (libffi_cv_as_x86_64_unwind_section_type): New test.

[pf3gnuchains/gcc-fork.git] / libffi / configure.ac

diff --git a/libffi/configure.ac b/libffi/configure.ac
index c0e0da1..1b484f9 100644 (file)
--- a/libffi/configure.ac
+++ b/libffi/configure.ac
@@ -284,6 +284,21 @@ case "$target" in
      ;;
 esac
 
+if test x$TARGET = xX86_64; then
+    AC_CACHE_CHECK([assembler 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 $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
+           libffi_cv_as_x86_64_unwind_section_type=no
+       fi
+       ])
+    if test "x$libffi_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
+fi
+
 AC_CACHE_CHECK([whether .eh_frame section should be read-only],
     libffi_cv_ro_eh_frame, [
        libffi_cv_ro_eh_frame=no