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-rw-r--r--m4/time_h.m410
1 files changed, 8 insertions, 2 deletions
diff --git a/m4/time_h.m4 b/m4/time_h.m4
index 98d7b6e01..f6bf3a4f3 100644
--- a/m4/time_h.m4
+++ b/m4/time_h.m4
@@ -1,8 +1,8 @@
# Configure a more-standard replacement for <time.h>.
-# Copyright (C) 2000-2001, 2003-2007, 2009-2022 Free Software Foundation, Inc.
+# Copyright (C) 2000-2001, 2003-2007, 2009-2023 Free Software Foundation, Inc.
-# serial 19
+# serial 20
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
@@ -19,6 +19,12 @@ AC_DEFUN_ONCE([gl_TIME_H],
gl_NEXT_HEADERS([time.h])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use.
+ gl_WARN_ON_USE_PREPARE([[
+#include <time.h>
+ ]], [asctime_r ctime_r])
+
AC_REQUIRE([AC_C_RESTRICT])
AC_CACHE_CHECK([for TIME_UTC in <time.h>],