The gl_PRINTF_DIRECTIVE_N test uses type 'uintptr_t'. While it happens to be
present from including <stdio.h> or <stdlib.h>, it's more future-proof to
explicitly include <inttypes.h>.
2020-07-21 Bruno Haible <br...@clisp.org>
printf-posix: Make an autoconf test more future-proof.
* m4/printf.m4 (gl_PRINTF_DIRECTIVE_N): Include <inttypes.h> before
using uintptr_t.
diff --git a/m4/printf.m4 b/m4/printf.m4
index df473d8..fba8501 100644
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -1,4 +1,4 @@
-# printf.m4 serial 64
+# printf.m4 serial 65
dnl Copyright (C) 2003, 2007-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -680,7 +680,10 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
-/* See page about "Parameter Validation" on msdn.microsoft.com. */
+#include <inttypes.h>
+/* See page about "Parameter Validation" on msdn.microsoft.com.
+
<https://docs.microsoft.com/en-us/cpp/c-runtime-library/parameter-validation>
+
<https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/set-invalid-parameter-handler-set-thread-local-invalid-parameter-handler>
*/
static void cdecl
invalid_parameter_handler (const wchar_t *expression,
const wchar_t *function,
