Commit | Line | Data |
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f8e27d88 CB |
1 | dnl Reentrant time functions: localtime_r, gmtime_r. |
2 | ||
c0c3707f | 3 | dnl Copyright (C) 2003, 2006-2019 Free Software Foundation, Inc. |
f8e27d88 CB |
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. | |
c0c3707f CB |
20 | AC_CHECK_DECLS([localtime_r], [], [], |
21 | [[/* mingw's <time.h> provides the functions asctime_r, ctime_r, | |
22 | gmtime_r, localtime_r only if <unistd.h> or <pthread.h> has | |
23 | been included before. */ | |
24 | #if defined __MINGW32__ | |
25 | # include <unistd.h> | |
26 | #endif | |
27 | #include <time.h> | |
28 | ]]) | |
f8e27d88 CB |
29 | if test $ac_cv_have_decl_localtime_r = no; then |
30 | HAVE_DECL_LOCALTIME_R=0 | |
31 | fi | |
32 | ||
33 | AC_CHECK_FUNCS_ONCE([localtime_r]) | |
34 | if test $ac_cv_func_localtime_r = yes; then | |
35 | HAVE_LOCALTIME_R=1 | |
36 | AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature], | |
37 | [gl_cv_time_r_posix], | |
38 | [AC_COMPILE_IFELSE( | |
39 | [AC_LANG_PROGRAM( | |
c0c3707f CB |
40 | [[/* mingw's <time.h> provides the functions asctime_r, ctime_r, |
41 | gmtime_r, localtime_r only if <unistd.h> or <pthread.h> has | |
42 | been included before. */ | |
43 | #if defined __MINGW32__ | |
44 | # include <unistd.h> | |
45 | #endif | |
46 | #include <time.h> | |
47 | ]], | |
f8e27d88 CB |
48 | [[/* We don't need to append 'restrict's to the argument types, |
49 | even though the POSIX signature has the 'restrict's, | |
50 | since C99 says they can't affect type compatibility. */ | |
51 | struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r; | |
52 | if (ptr) return 0; | |
53 | /* Check the return type is a pointer. | |
54 | On HP-UX 10 it is 'int'. */ | |
55 | *localtime_r (0, 0);]]) | |
56 | ], | |
57 | [gl_cv_time_r_posix=yes], | |
58 | [gl_cv_time_r_posix=no]) | |
59 | ]) | |
60 | if test $gl_cv_time_r_posix = yes; then | |
61 | REPLACE_LOCALTIME_R=0 | |
62 | else | |
63 | REPLACE_LOCALTIME_R=1 | |
64 | fi | |
65 | else | |
66 | HAVE_LOCALTIME_R=0 | |
c0c3707f CB |
67 | dnl On mingw, localtime_r() is defined as an inline function; use through a |
68 | dnl direct function call works but the use as a function pointer leads to a | |
69 | dnl link error. | |
70 | AC_CACHE_CHECK([whether localtime_r exists as an inline function], | |
71 | [gl_cv_func_localtime_r_inline], | |
72 | [AC_LINK_IFELSE( | |
73 | [AC_LANG_PROGRAM( | |
74 | [[/* mingw's <time.h> provides the functions asctime_r, ctime_r, | |
75 | gmtime_r, localtime_r only if <unistd.h> or <pthread.h> has | |
76 | been included before. */ | |
77 | #if defined __MINGW32__ | |
78 | # include <unistd.h> | |
79 | #endif | |
80 | #include <time.h> | |
81 | ]], | |
82 | [[time_t a; | |
83 | struct tm r; | |
84 | localtime_r (&a, &r); | |
85 | ]]) | |
86 | ], | |
87 | [gl_cv_func_localtime_r_inline=yes], | |
88 | [gl_cv_func_localtime_r_inline=no]) | |
89 | ]) | |
90 | if test $gl_cv_func_localtime_r_inline = yes; then | |
91 | REPLACE_LOCALTIME_R=1 | |
92 | fi | |
f8e27d88 CB |
93 | fi |
94 | ]) | |
95 | ||
96 | # Prerequisites of lib/time_r.c. | |
97 | AC_DEFUN([gl_PREREQ_TIME_R], [ | |
98 | : | |
99 | ]) |