1dnl Reentrant time functions like localtime_r.
2
3dnl Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8dnl Written by Paul Eggert.
9
10AC_DEFUN([gl_TIME_R],
11[
12 dnl Persuade glibc and Solaris <time.h> to declare localtime_r.
13  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14
15  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
16  AC_REQUIRE([AC_C_RESTRICT])
17
18  AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
19    [gl_cv_time_r_posix],
20    [AC_TRY_COMPILE(
21       [#include <time.h>],
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;
26        if (ptr) return 0;],
27       [gl_cv_time_r_posix=yes],
28       [gl_cv_time_r_posix=no])])
29  if test $gl_cv_time_r_posix = yes; then
30    REPLACE_LOCALTIME_R=0
31  else
32    REPLACE_LOCALTIME_R=1
33    AC_LIBOBJ([time_r])
34    gl_PREREQ_TIME_R
35  fi
36])
37
38# Prerequisites of lib/time_r.c.
39AC_DEFUN([gl_PREREQ_TIME_R], [
40  :
41])
42