1 dnl Reentrant time functions like localtime_r.
3 dnl Copyright (C) 2003, 2006, 2007, 2008 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 dnl Written by Paul Eggert.
12 dnl Persuade glibc and Solaris <time.h> to declare localtime_r.
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
16 AC_REQUIRE([AC_C_RESTRICT])
18 AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
22 [/* We don't need to append 'restrict's to the argument types,
23 even though the POSIX signature has the 'restrict's,
24 since C99 says they can't affect type compatibility. */
25 struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
27 /* Check the return type is a pointer. On HP-UX 10 it is 'int'. */
28 *localtime_r (0, 0);],
29 [gl_cv_time_r_posix=yes],
30 [gl_cv_time_r_posix=no])])
31 if test $gl_cv_time_r_posix = yes; then
40 # Prerequisites of lib/time_r.c.
41 AC_DEFUN([gl_PREREQ_TIME_R], [