From 62aa03931753e532cbae0fa56725bb5e2a757dff Mon Sep 17 00:00:00 2001
From: Oliver Kiddle <opk@zsh.org>
Date: Sun, 30 Nov 2014 23:33:19 +0100
Subject: 33820: detect support for realpath() with a NULL argument and fixes
 to the use of it

---
 configure.ac | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 56c4cfb13..8ea9737c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1302,6 +1302,23 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
 	       cygwin_conv_path)
 AC_FUNC_STRCOLL
 
+AH_TEMPLATE([REALPATH_ACCEPTS_NULL],
+[Define if realpath() accepts NULL as its second argument.])
+AC_CACHE_CHECK([if realpath accepts NULL],
+zsh_cv_func_realpath_accepts_null,
+[AC_RUN_IFELSE([AC_LANG_PROGRAM([
+#include <stdlib.h>
+#include <limits.h>
+],[
+exit(!realpath("/", (char*)0));
+])],
+[zsh_cv_func_realpath_accepts_null=yes],
+[zsh_cv_func_realpath_accepts_null=no],
+[zsh_cv_func_realpath_accepts_null=$ac_cv_func_canonicalize_file_name])])
+if test x$zsh_cv_func_realpath_accepts_null = xyes; then
+  AC_DEFINE(REALPATH_ACCEPTS_NULL)
+fi
+
 if test x$enable_cap = xyes; then
   AC_CHECK_FUNCS(cap_get_proc)
 fi
-- 
cgit 1.4.1