From 2939c57ca7aa80df126332e04de8a33a56978b42 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 23 Nov 2020 17:51:52 +0900
Subject: [PATCH] Check if _FORTIFY_SOURCE really works

i686-pc-cygwin gcc 6.4.0 seems broken around ssp.h, when compiling
with both of optimization and _FORTIFY_SOURCE.
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 3174781f03..c2b1a078a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -673,7 +673,8 @@ AS_IF([test "$GCC" = yes], [
 				 [disable -D_FORTIFY_SOURCE=2 option, which causes link error on mingw]),
 		  [fortify_source=$enableval])
     AS_IF([test "x$fortify_source" != xno], [
-    RUBY_TRY_CFLAGS(-D_FORTIFY_SOURCE=2, [RUBY_APPEND_OPTION(XCFLAGS, -D_FORTIFY_SOURCE=2)])
+        RUBY_TRY_CFLAGS([$optflags -D_FORTIFY_SOURCE=2], [RUBY_APPEND_OPTION(XCFLAGS, -D_FORTIFY_SOURCE=2)], [],
+                        [@%:@include <stdio.h>])
     ])
 
     : ${MJIT_HEADER_FLAGS='-P -dD'}