From: mquinson <mquinson@48e7efb5-ca39-0410-a469-dd3cf9ba447f>
Date: Tue, 1 Mar 2005 07:43:43 +0000 (+0000)
Subject: Check whether printf(%s,NULL) works or segfaults
X-Git-Tag: v3.3~4228
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/0458bcfaa9cb1c7c87e15f4ec14fa7de1a130a1f

Check whether printf(%s,NULL) works or segfaults


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@1125 48e7efb5-ca39-0410-a469-dd3cf9ba447f
---

diff --git a/acmacro/print_null.m4 b/acmacro/print_null.m4
new file mode 100644
index 0000000000..ee5787cc24
--- /dev/null
+++ b/acmacro/print_null.m4
@@ -0,0 +1,23 @@
+dnl AC_CHECK_PRINTF_NULL: Check whether printf("%s",NULL) works or segfault
+
+dnl it uses AC_RUN and assume the worse while cross-compiling
+
+dnl Then, you can:
+dnl #ifndef PRINTF_NULL_WORKING
+dnl #  define PRINTF_STR(a) (a)?:"(null)" 
+dnl #else
+dnl #  define PRINTF_STR(a) (a)
+dnl #endif
+
+AC_DEFUN([AC_CHECK_PRINTF_NULL],
+ [
+AC_MSG_CHECKING([whether printf("%s",NULL) works...])
+AC_RUN_IFELSE(AC_LANG_PROGRAM([#include <stdio.h>],
+                              [printf("%s",NULL);]),
+              AC_DEFINE(PRINTF_NULL_WORKING,
+	                1,
+			[Indicates whether printf("%s",NULL) works])
+	      AC_MSG_RESULT(yes),
+	      AC_MSG_RESULT(no),
+	      AC_MSG_RESULT(assuming the worse in cross-compilation))
+])