Avoid warning at configure time with "gcc -Wall".

[gnulib.git] / m4 / vasprintf.m4

diff --git a/m4/vasprintf.m4 b/m4/vasprintf.m4
index 385e92e..18ca632 100644 (file)
--- a/m4/vasprintf.m4
+++ b/m4/vasprintf.m4
@@ -1,5 +1,5 @@
-# vasprintf.m4 serial 1
-dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
+# vasprintf.m4 serial 2
+dnl Copyright (C) 2002-2003, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,11 +9,19 @@ AC_DEFUN([gl_FUNC_VASPRINTF],
   AC_REPLACE_FUNCS(vasprintf)
   if test $ac_cv_func_vasprintf = no; then
     AC_LIBOBJ(asprintf)
+    gl_PREREQ_VASPRINTF_H
     gl_PREREQ_VASPRINTF
     gl_PREREQ_ASPRINTF
   fi
 ])
 
+# Prerequisites of lib/vasprintf.h.
+AC_DEFUN([gl_PREREQ_VASPRINTF_H],
+[
+  dnl Persuade glibc <stdio.h> to declare asprintf() and vasprintf().
+  AC_REQUIRE([AC_GNU_SOURCE])
+])
+
 # Prerequisites of lib/vasprintf.c.
 AC_DEFUN([gl_PREREQ_VASPRINTF],
 [