--- libffi/configure.ac Mon Mar 15 19:47:38 2010 +0100

+++ libffi/configure.ac Mon Mar 15 19:47:38 2010 +0100

@@ -284,6 +284,21 @@

;;

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

--- libffi/src/x86/unix64.S Mon Mar 15 19:47:38 2010 +0100

+++ libffi/src/x86/unix64.S Mon Mar 15 19:47:38 2010 +0100

@@ -324,7 +324,11 @@

.LUW9:

.size ffi_closure_unix64,.-ffi_closure_unix64

+#ifdef HAVE_AS_X86_64_UNWIND_SECTION_TYPE

+ .section .eh_frame,"a",@unwind

+#else

.section .eh_frame,"a",@progbits

+#endif

.Lframe1:

.long .LECIE1-.LSCIE1 /* CIE Length */

.LSCIE1: