From b69159b5f89b95930fb162a75bb3854f62eb536a Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Wed, 4 Dec 2019 23:30:37 +0100
Subject: [PATCH] Define _FORTIFY_SOURCE only on linux-gnu

---
 configure    | 8 ++++++--
 configure.ac | 3 +--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index 42d665e0..e871c2d0 100755
--- a/configure
+++ b/configure
@@ -6903,6 +6903,8 @@ if test $ac_cv_defined___wasi__ != "no"; then :
   WASI="yes"
 fi
 
+case $host_os in #(
+  linux-gnu) :
 
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to add -D_FORTIFY_SOURCE=2 to CPPFLAGS" >&5
 $as_echo_n "checking whether to add -D_FORTIFY_SOURCE=2 to CPPFLAGS... " >&6; }
@@ -6962,7 +6964,10 @@ $as_echo "no" >&6; }
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
-
+ ;; #(
+  *) :
+      ;;
+esac
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -fvisibility=hidden" >&5
 $as_echo_n "checking whether C compiler accepts -fvisibility=hidden... " >&6; }
@@ -7042,7 +7047,6 @@ else
   :
 fi
 
-  CPPFLAGS="$CPPFLAGS -U_FORTIFY_SOURCE"
  ;;
 esac
 
diff --git a/configure.ac b/configure.ac
index daf7aac5..fc3d5801 100644
--- a/configure.ac
+++ b/configure.ac
@@ -217,14 +217,13 @@ AC_C_VARARRAYS
 
 AC_CHECK_DEFINE([__wasi__], [WASI="yes"], [])
 
-AX_ADD_FORTIFY_SOURCE
+AS_CASE([$host_os], [linux-gnu], [AX_ADD_FORTIFY_SOURCE], [ ])
 
 AX_CHECK_COMPILE_FLAG([-fvisibility=hidden],
   [CFLAGS="$CFLAGS -fvisibility=hidden"])
 
 AS_CASE([$host_os], [cygwin*|mingw*|msys|pw32*|cegcc*], [ ], [
   AX_CHECK_COMPILE_FLAG([-fPIC], [CFLAGS="$CFLAGS -fPIC"])
-  CPPFLAGS="$CPPFLAGS -U_FORTIFY_SOURCE"
 ])
 
 AS_IF([test "$enable_pie" != "no"],[