base64: Reference latest RFC.

[gnulib.git] / m4 / size_max.m4

diff --git a/m4/size_max.m4 b/m4/size_max.m4
index e0e7b3f..e807098 100644 (file)
--- a/m4/size_max.m4
+++ b/m4/size_max.m4
@@ -1,5 +1,5 @@
-# size_max.m4 serial 7
-dnl Copyright (C) 2003, 2005-2006, 2008 Free Software Foundation, Inc.
+# size_max.m4 serial 10
+dnl Copyright (C) 2003, 2005-2006, 2008-2011 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.
 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.


@@ -10,8 +10,7 @@ AC_DEFUN([gl_SIZE_MAX],
 [
   AC_CHECK_HEADERS([stdint.h])
   dnl First test whether the system already has SIZE_MAX.
 [
   AC_CHECK_HEADERS([stdint.h])
   dnl First test whether the system already has SIZE_MAX.

-  AC_MSG_CHECKING([for SIZE_MAX])
-  AC_CACHE_VAL([gl_cv_size_max], [
+  AC_CACHE_CHECK([for SIZE_MAX], [gl_cv_size_max], [

     gl_cv_size_max=
     AC_EGREP_CPP([Found it], [
 #include <limits.h>
     gl_cv_size_max=
     AC_EGREP_CPP([Found it], [
 #include <limits.h>


@@ -35,10 +34,14 @@ Found it
         if test $fits_in_uint = 1; then
           dnl Even though SIZE_MAX fits in an unsigned int, it must be of type
           dnl 'unsigned long' if the type 'size_t' is the same as 'unsigned long'.
         if test $fits_in_uint = 1; then
           dnl Even though SIZE_MAX fits in an unsigned int, it must be of type
           dnl 'unsigned long' if the type 'size_t' is the same as 'unsigned long'.

-          AC_TRY_COMPILE([#include <stddef.h>
-            extern size_t foo;
-            extern unsigned long foo;
-            ], [], [fits_in_uint=0])
+          AC_COMPILE_IFELSE(
+            [AC_LANG_PROGRAM(
+               [[#include <stddef.h>
+                 extern size_t foo;
+                 extern unsigned long foo;
+               ]],
+               [[]])],
+            [fits_in_uint=0])

         fi
         dnl We cannot use 'expr' to simplify this expression, because 'expr'
         dnl works only with 'long' integers in the host environment, while we
         fi
         dnl We cannot use 'expr' to simplify this expression, because 'expr'
         dnl works only with 'long' integers in the host environment, while we


@@ -54,11 +57,19 @@ Found it
       fi
     fi
   ])
       fi
     fi
   ])

-  AC_MSG_RESULT([$gl_cv_size_max])

   if test "$gl_cv_size_max" != yes; then
     AC_DEFINE_UNQUOTED([SIZE_MAX], [$gl_cv_size_max],
       [Define as the maximum value of type 'size_t', if the system doesn't define it.])
   fi
   if test "$gl_cv_size_max" != yes; then
     AC_DEFINE_UNQUOTED([SIZE_MAX], [$gl_cv_size_max],
       [Define as the maximum value of type 'size_t', if the system doesn't define it.])
   fi

+  dnl Don't redefine SIZE_MAX in config.h if config.h is re-included after
+  dnl <stdint.h>. Remember that the #undef in AH_VERBATIM gets replaced with
+  dnl #define by AC_DEFINE_UNQUOTED.
+  AH_VERBATIM([SIZE_MAX],
+[/* Define as the maximum value of type 'size_t', if the system doesn't define
+   it. */
+#ifndef SIZE_MAX
+# undef SIZE_MAX
+#endif])

 ])
 
 dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
 ])
 
 dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.