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-rw-r--r--m4/check-os-options.m415
1 files changed, 15 insertions, 0 deletions
diff --git a/m4/check-os-options.m4 b/m4/check-os-options.m4
index a4f1faa..644bf71 100644
--- a/m4/check-os-options.m4
+++ b/m4/check-os-options.m4
@@ -123,6 +123,21 @@ char buf[1]; getentropy(buf, 1);
 	*) ;;
 esac
 
+# Check if time_t is sized correctly
+AC_CHECK_SIZEOF([time_t], [time.h])
+AM_CONDITIONAL([SMALL_TIME_T], [test "$ac_cv_sizeof_time_t" = "4"])
+if test "$ac_cv_sizeof_time_t" = "4"; then
+    AC_DEFINE([SMALL_TIME_T])
+    echo " ** Warning, this system is unable to represent times past 2038"
+    echo " ** It will behave incorrectly when handling valid RFC5280 dates"
+
+    if test "$host_os" = "mingw32" ; then
+        echo " **"
+        echo " ** You can solve this by adjusting the build flags in your"
+        echo " ** mingw-w64 toolchain. Refer to README.windows for details."
+    fi
+fi
+
 AM_CONDITIONAL([HOST_AIX],     [test x$HOST_OS = xaix])
 AM_CONDITIONAL([HOST_CYGWIN],  [test x$HOST_OS = xcygwin])
 AM_CONDITIONAL([HOST_DARWIN],  [test x$HOST_OS = xdarwin])