X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=m4%2Fgetdate.m4;h=5f98229f6a9306134f3fe197716f21c1d46c3c77;hb=22f1eb8bc17e5be72dd23d42d6aaa60196ac22e6;hp=d160329accde4bbb7da70c7f34037c3fde48ae1c;hpb=138fc7e67e3d9845cd7d81aad0e9c7724784f9b9;p=tar

diff --git a/m4/getdate.m4 b/m4/getdate.m4
index d160329..5f98229 100644
--- a/m4/getdate.m4
+++ b/m4/getdate.m4
@@ -1,19 +1,25 @@
-# getdate.m4 serial 12
-dnl Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+# getdate.m4 serial 16
+dnl Copyright (C) 2002-2006, 2008-2010 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 Define HAVE_COMPOUND_LITERALS if the C compiler supports compound literals
+dnl as in ISO C99.
+dnl Note that compound literals such as (struct s) { 3, 4 } can be used for
+dnl initialization of stack-allocated variables, but are not constant
+dnl expressions and therefore cannot be used as initializer for global or
+dnl static variables (even though gcc supports this in pre-C99 mode).
 AC_DEFUN([gl_C_COMPOUND_LITERALS],
 [
-  AC_CACHE_CHECK([for compound literals], gl_cv_compound_literals,
-  [AC_TRY_COMPILE([struct s { int i, j; }; struct s s = (struct s) { 1, 2 };],
-    [struct s t = (struct s) { 3, 4 };
-     if (t.i != 0) return 0;],
+  AC_CACHE_CHECK([for compound literals], [gl_cv_compound_literals],
+  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[struct s { int i, j; };]],
+      [[struct s t = (struct s) { 3, 4 };
+        if (t.i != 0) return 0;]])],
     gl_cv_compound_literals=yes,
     gl_cv_compound_literals=no)])
   if test $gl_cv_compound_literals = yes; then
-    AC_DEFINE(HAVE_COMPOUND_LITERALS, 1,
+    AC_DEFINE([HAVE_COMPOUND_LITERALS], [1],
       [Define if you have compound literals.])
   fi
 ])
@@ -30,4 +36,18 @@ AC_DEFUN([gl_GETDATE],
   AC_STRUCT_TIMEZONE
   AC_REQUIRE([gl_CLOCK_TIME])
   AC_REQUIRE([gl_TM_GMTOFF])
+  AC_COMPILE_IFELSE(
+    [AC_LANG_SOURCE([[
+#include <time.h> /* for time_t */
+#include <limits.h> /* for CHAR_BIT, LONG_MIN, LONG_MAX */
+#define TYPE_MINIMUM(t) \
+  ((t) ((t) 0 < (t) -1 ? (t) 0 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
+#define TYPE_MAXIMUM(t) \
+  ((t) ((t) 0 < (t) -1 ? (t) -1 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
+typedef int verify_min[2 * (LONG_MIN <= TYPE_MINIMUM (time_t)) - 1];
+typedef int verify_max[2 * (TYPE_MAXIMUM (time_t) <= LONG_MAX) - 1];
+       ]])],
+    [AC_DEFINE([TIME_T_FITS_IN_LONG_INT], [1],
+       [Define to 1 if all 'time_t' values fit in a 'long int'.])
+    ])
 ])