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1 | dnl Reentrant time functions: localtime_r, gmtime_r. |
2 | ||
caf8a9b2 | 3 | dnl Copyright (C) 2003, 2006-2012 Free Software Foundation, Inc. |
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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. | |
7 | ||
8 | dnl Written by Paul Eggert. | |
9 | ||
10 | AC_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 | dnl Some systems don't declare localtime_r() and gmtime_r() if _REENTRANT is | |
19 | dnl not defined. | |
05730648 | 20 | AC_CHECK_DECLS([localtime_r], [], [], [[#include <time.h>]]) |
1fd182f0 PE |
21 | if test $ac_cv_have_decl_localtime_r = no; then |
22 | HAVE_DECL_LOCALTIME_R=0 | |
23 | fi | |
24 | ||
25 | AC_CHECK_FUNCS_ONCE([localtime_r]) | |
26 | if test $ac_cv_func_localtime_r = yes; then | |
27 | HAVE_LOCALTIME_R=1 | |
28 | AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature], | |
29 | [gl_cv_time_r_posix], | |
30 | [AC_COMPILE_IFELSE( | |
31 | [AC_LANG_PROGRAM( | |
32 | [[#include <time.h>]], | |
33 | [[/* We don't need to append 'restrict's to the argument types, | |
34 | even though the POSIX signature has the 'restrict's, | |
35 | since C99 says they can't affect type compatibility. */ | |
36 | struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r; | |
37 | if (ptr) return 0; | |
38 | /* Check the return type is a pointer. | |
39 | On HP-UX 10 it is 'int'. */ | |
40 | *localtime_r (0, 0);]]) | |
41 | ], | |
42 | [gl_cv_time_r_posix=yes], | |
43 | [gl_cv_time_r_posix=no]) | |
44 | ]) | |
45 | if test $gl_cv_time_r_posix = yes; then | |
46 | REPLACE_LOCALTIME_R=0 | |
47 | else | |
48 | REPLACE_LOCALTIME_R=1 | |
49 | fi | |
50 | else | |
51 | HAVE_LOCALTIME_R=0 | |
52 | fi | |
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53 | ]) |
54 | ||
55 | # Prerequisites of lib/time_r.c. | |
56 | AC_DEFUN([gl_PREREQ_TIME_R], [ | |
57 | : | |
58 | ]) |