From 2e82b095cd2ebd3ecc1635bb5cbe65eb99de7ae7 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Wed, 27 Oct 2010 11:26:53 +0000
Subject: Better support unsigned time_t

---
 acinclude.m4 | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
index 28366ee38..a37e0f528 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -305,5 +305,28 @@ fi
 ])
 
 
-
-
+# GNUPG_TIME_T_UNSIGNED
+# Check whether time_t is unsigned
+#
+AC_DEFUN([GNUPG_TIME_T_UNSIGNED],
+  [ AC_CACHE_CHECK(whether time_t is unsigned, gnupg_cv_time_t_unsigned,
+     [AC_REQUIRE([AC_HEADER_TIME])dnl
+      AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY(
+       [AC_INCLUDES_DEFAULT([])
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+],
+       [((time_t)-1) < 0])],
+       gnupg_cv_time_t_unsigned=no, gnupg_cv_time_t_unsigned=yes)])
+    if test $gnupg_cv_time_t_unsigned = yes; then
+      AC_DEFINE(HAVE_UNSIGNED_TIME_T,1,[Defined if time_t is an unsigned type])
+    fi
+])# GNUPG_TIME_T_UNSIGNED
-- 
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