From 1ba85a1abdc293f48583f136bc3a6d60025bca69 Mon Sep 17 00:00:00 2001
From: Ken Raeburn <raeburn@mit.edu>
Date: Thu, 23 Aug 2007 07:11:21 +0000
Subject: [PATCH] Use -Wno-format-zero-length if GCC version supports it

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19848 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/aclocal.m4 | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/aclocal.m4 b/src/aclocal.m4
index 8cdbc4788..f29446a1f 100644
--- a/src/aclocal.m4
+++ b/src/aclocal.m4
@@ -625,6 +625,19 @@ if test "$GCC" = yes ; then
     else
       CFLAGS="$CFLAGS -pedantic"
     fi
+    AC_CACHE_CHECK([if GCC supports -Wno-format-zero-length],
+    		   krb5_cv_gcc_Wno_format_zero_length,
+    [# first try without, then with
+    AC_TRY_COMPILE([], 1;,
+      [old_cflags="$CFLAGS"
+       CFLAGS="$CFLAGS -Wno-format-zero-length"
+       AC_TRY_COMPILE([], 1;, krb5_cv_gcc_Wno_format_zero_length=yes,
+       krb5_cv_gcc_Wno_format_zero_length=no)
+       CFLAGS="$old_cflags"],
+      [AC_MSG_ERROR(compiling simple test program with $CFLAGS failed)])])
+    if test "$krb5_cv_gcc_Wno_format_zero_length" = yes; then
+      CFLAGS="$CFLAGS -Wno-format-zero-length"
+    fi
   fi
   if test "`uname -s`" = Darwin ; then
     # Someday this should be a feature test.
-- 
2.26.2