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dnl Reentrant time functions like localtime_r.
dnl Copyright (C) 2003, 2006 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],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl 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
AC_DEFINE([HAVE_TIME_R_POSIX], 1,
[Define to 1 if localtime_r, etc. have the type signatures that
POSIX requires.])
else
AC_LIBOBJ([time_r])
fi
])
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