From: Timo Sirainen <timo.sirainen@dovecot.fi>
Date: Fri, 22 Dec 2017 07:36:48 +0000 (+0200)
Subject: m4: Avoid _FORTIFY_SOURCE redefinition warnings
X-Git-Tag: 2.3.9~2623
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ed97ec6905f3d024058a7c3643358a1b807be243;p=thirdparty%2Fdovecot%2Fcore.git

m4: Avoid _FORTIFY_SOURCE redefinition warnings

Some source based distros like Gentoo already enable -D_FORTIFY_SOURCE=2
by default resulting in the following warnings during build:

<command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined
<built-in>: note: this is the location of the previous definition

Patch by Eray Aslan
---

diff --git a/m4/cc_fortify.m4 b/m4/cc_fortify.m4
index 3137eece85..070c75705f 100644
--- a/m4/cc_fortify.m4
+++ b/m4/cc_fortify.m4
@@ -8,7 +8,7 @@ AC_DEFUN([AC_CC_D_FORTIFY_SOURCE],[
       case "$host" in
         *)
           gl_COMPILER_OPTION_IF([-O2 -D_FORTIFY_SOURCE=2], [
-            CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
+            CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
             ],
             [],
             [AC_LANG_PROGRAM([[