https://src.fedoraproject.org/rpms/perl-Coro/blob/rawhide/f/Coro-6.512-Disable-disabling-FORTIFY_SOURCE.patch

From 7accb61160334aa89bf771323c91e40f42af8574 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Fri, 14 Jul 2017 14:59:32 +0200
Subject: [PATCH] Disable disabling FORTIFY_SOURCE
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6.512 started to disable FORTIFY_SOURCE feature because it breaks
jumps on some C standard libraries.

Signed-off-by: Petr Písař <ppisar@redhat.com>
--- a/Coro/Makefile.PL
+++ b/Coro/Makefile.PL
@@ -219,7 +219,6 @@ if ($iface eq "u") {
    print "\nUsing ucontext implementation\n\n";
    conftest ("TEST_makecontext");
 } elsif ($iface eq "s") {
-   $DEFINE .= " -D_FORTIFY_SOURCE=0";
    $DEFINE .= " -DCORO_SJLJ";
    print "\nUsing setjmp/longjmp/sigaltstack implementation\n\n";
    conftest ("TEST_sigaltstack");
--- a/Coro/libcoro/coro.h
+++ b/Coro/libcoro/coro.h
@@ -342,12 +342,6 @@ struct coro_context
 #  define _GNU_SOURCE /* for glibc */
 # endif
 
-/* try to disable well-meant but buggy checks in some libcs */
-# ifdef _FORTIFY_SOURCE
-#  undef _FORTIFY_SOURCE
-#  undef __USE_FORTIFY_LEVEL /* helps some more when too much has been included already */
-# endif
-
 # if !CORO_LOSER
 #  include <unistd.h>
 # endif
-- 
2.9.4