Merge from gnulib

[gnu-emacs] / m4 / stdio_h.m4

diff --git a/m4/stdio_h.m4 b/m4/stdio_h.m4
index 42173387afffeed31db4357a6fcee94155b72ec2..e0c4bde1f8e5cf39d248148741f027a6d7a752c4 100644 (file)
--- a/m4/stdio_h.m4
+++ b/m4/stdio_h.m4
@@ -1,4 +1,4 @@
-# stdio_h.m4 serial 43
+# stdio_h.m4 serial 44
 dnl Copyright (C) 2007-2015 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -12,6 +12,24 @@ AC_DEFUN([gl_STDIO_H],
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   gl_NEXT_HEADERS([stdio.h])
 
+  dnl Determine whether __USE_MINGW_ANSI_STDIO makes printf and
+  dnl inttypes.h behave like gnu instead of system; we must give our
+  dnl printf wrapper the right attribute to match.
+  AC_CACHE_CHECK([whether inttypes macros match system or gnu printf],
+    [gl_cv_func_printf_attribute_flavor],
+    [AC_EGREP_CPP([findme .(ll|j)d. findme],
+      [#define __STDC_FORMAT_MACROS 1
+       #include <stdio.h>
+       #include <inttypes.h>
+       findme PRIdMAX findme
+      ], [gl_cv_func_printf_attribute_flavor=gnu],
+      [gl_cv_func_printf_attribute_flavor=system])])
+  if test "$gl_cv_func_printf_attribute_flavor" = gnu; then
+    AC_DEFINE([GNULIB_PRINTF_ATTRIBUTE_FLAVOR_GNU], [1],
+      [Define to 1 if printf and friends should be labeled with
+       attribute "__gnu_printf__" instead of "__printf__"])
+  fi
+
   dnl No need to create extra modules for these functions. Everyone who uses
   dnl <stdio.h> likely needs them.
   GNULIB_FSCANF=1