A syntax error in an autoconf test (NULL being used without prior
#include <stddef.h>/<stdlib.h>) caused the autoconfiguration to
override the function c32rtomb always. This patch fixes it.
2023-04-04 Bruno Haible <br...@clisp.org>
c32rtomb: Fix an autoconf test.
* m4/c32rtomb.m4 (gl_FUNC_C32RTOMB): In a test program, include
<stddef.h>, for NULL.
diff --git a/m4/c32rtomb.m4 b/m4/c32rtomb.m4
index 41c07e75c9..539e4f884c 100644
--- a/m4/c32rtomb.m4
+++ b/m4/c32rtomb.m4
@@ -1,4 +1,4 @@
-# c32rtomb.m4 serial 4
+# c32rtomb.m4 serial 5
dnl Copyright (C) 2020-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -53,6 +53,7 @@ AC_DEFUN([gl_FUNC_C32RTOMB]
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
+#include <stddef.h>
#include <uchar.h>
int main ()
{
