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+dnl Reentrant time functions like localtime_r.
+
+dnl Copyright (C) 2003, 2006, 2007 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 Written by Paul Eggert.
+
+AC_DEFUN([gl_TIME_R],
+[
+ dnl Persuade glibc and Solaris <time.h> to declare localtime_r.
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+ AC_REQUIRE([AC_C_RESTRICT])
+
+ AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
+ [gl_cv_time_r_posix],
+ [AC_TRY_COMPILE(
+ [#include <time.h>],
+ [/* We don't need to append 'restrict's to the argument types,
+ even though the POSIX signature has the 'restrict's,
+ since C99 says they can't affect type compatibility. */
+ struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
+ if (ptr) return 0;],
+ [gl_cv_time_r_posix=yes],
+ [gl_cv_time_r_posix=no])])
+ if test $gl_cv_time_r_posix = yes; then
+ REPLACE_LOCALTIME_R=0
+ else
+ REPLACE_LOCALTIME_R=1
+ AC_LIBOBJ([time_r])
+ gl_PREREQ_TIME_R
+ fi
+])
+
+# Prerequisites of lib/time_r.c.
+AC_DEFUN([gl_PREREQ_TIME_R], [
+ :
+])