2007-08-06 Simon Josefsson <simon@josefsson.org>

[gnulib.git] / m4 / inttypes.m4

diff --git a/m4/inttypes.m4 b/m4/inttypes.m4
index 095ace9..a944659 100644 (file)
--- a/m4/inttypes.m4
+++ b/m4/inttypes.m4
@@ -1,4 +1,4 @@
-# inttypes.m4 serial 8
+# inttypes.m4 serial 10
 dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -37,7 +37,8 @@ AC_DEFUN([gl_INTTYPES_H],
 #define __STDC_LIMIT_MACROS 1 /* to make it work also in C++ mode */
 #define __STDC_CONSTANT_MACROS 1 /* to make it work also in C++ mode */
 #define __STDC_FORMAT_MACROS 1 /* to make it work also in C++ mode */
-#include ABSOLUTE_INTTYPES_H
+#define _GL_JUST_INCLUDE_SYSTEM_INTTYPES_H /* work if build isn't clean */
+#include <inttypes.h>
 
 /* No need to duplicate the tests of stdint.m4; they are subsumed by
    $gl_cv_header_working_stdint_h = yes.  */
@@ -141,14 +142,23 @@ const char *l = /* implicit string concatenation */
   else
 
     AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
-    dnl AC_INCLUDES_DEFAULT defines $ac_cv_header_inttypes_h.
-    if test $ac_cv_header_inttypes_h = yes; then
-      gl_ABSOLUTE_HEADER([inttypes.h])
-      ABSOLUTE_INTTYPES_H=\"$gl_cv_absolute_inttypes_h\"
-    else
-      ABSOLUTE_INTTYPES_H=\"no/such/file/inttypes.h\"
-    fi
-    AC_SUBST([ABSOLUTE_INTTYPES_H])
+    gl_CHECK_NEXT_HEADERS([inttypes.h])
+
+    dnl Ensure that <stdint.h> defines the limit macros, since gnulib's
+    dnl <inttypes.h> relies on them.  This macro is only needed when a
+    dnl C++ compiler is in use; it has no effect for a C compiler.
+    dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
+    dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
+    dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
+    AC_DEFINE([__STDC_LIMIT_MACROS_TRIGGER], 1,
+      [Define to make the limit macros in <stdint.h> visible.])
+    AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
+[/* Ensure that <stdint.h> defines the limit macros, since gnulib's
+   <inttypes.h> relies on them.  */
+#if defined __cplusplus && !defined __STDC_LIMIT_MACROS && __STDC_LIMIT_MACROS_TRIGGER
+# define __STDC_LIMIT_MACROS 1
+#endif
+])
 
     PRIPTR_PREFIX=
     if test -n "$STDINT_H"; then