Ensure the linker supports @unwind sections in libffi.

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