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c8fff863 PE |
1 | # Configure a replacement for <sys/time.h>. |
2 | # serial 8 | |
3 | ||
4 | # Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc. | |
5 | # This file is free software; the Free Software Foundation | |
6 | # gives unlimited permission to copy and/or distribute it, | |
7 | # with or without modifications, as long as this notice is preserved. | |
8 | ||
9 | # Written by Paul Eggert and Martin Lambers. | |
10 | ||
11 | AC_DEFUN([gl_HEADER_SYS_TIME_H], | |
12 | [ | |
13 | dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement | |
14 | dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1 | |
15 | dnl statements that occur in other macros. | |
16 | AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY]) | |
17 | ]) | |
18 | ||
19 | AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY], | |
20 | [ | |
21 | AC_REQUIRE([AC_C_RESTRICT]) | |
22 | AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) | |
23 | AC_CHECK_HEADERS_ONCE([sys/time.h]) | |
24 | gl_CHECK_NEXT_HEADERS([sys/time.h]) | |
25 | ||
26 | if test $ac_cv_header_sys_time_h != yes; then | |
27 | HAVE_SYS_TIME_H=0 | |
28 | fi | |
29 | ||
30 | dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h> | |
31 | dnl only. So include that header in the list. | |
32 | gl_PREREQ_SYS_H_WINSOCK2 | |
33 | AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval], | |
34 | [AC_COMPILE_IFELSE( | |
35 | [AC_LANG_PROGRAM( | |
36 | [[#if HAVE_SYS_TIME_H | |
37 | #include <sys/time.h> | |
38 | #endif | |
39 | #include <time.h> | |
40 | #if HAVE_WINSOCK2_H | |
41 | # include <winsock2.h> | |
42 | #endif | |
43 | ]], | |
44 | [[static struct timeval x; x.tv_sec = x.tv_usec;]])], | |
45 | [gl_cv_sys_struct_timeval=yes], | |
46 | [gl_cv_sys_struct_timeval=no]) | |
47 | ]) | |
48 | if test $gl_cv_sys_struct_timeval != yes; then | |
49 | HAVE_STRUCT_TIMEVAL=0 | |
50 | else | |
51 | dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined | |
52 | dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only | |
53 | dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is | |
54 | dnl smaller than the 'time_t' type mandated by POSIX. | |
55 | AC_CACHE_CHECK([for correct struct timeval.tv_sec member], | |
56 | [gl_cv_sys_struct_timeval_tv_sec], | |
57 | [AC_COMPILE_IFELSE( | |
58 | [AC_LANG_PROGRAM( | |
59 | [[#if HAVE_SYS_TIME_H | |
60 | #include <sys/time.h> | |
61 | #endif | |
62 | #include <time.h> | |
63 | #if HAVE_WINSOCK2_H | |
64 | # include <winsock2.h> | |
65 | #endif | |
66 | ]], | |
67 | [[static struct timeval x; | |
68 | typedef int verify_tv_sec_type[sizeof (x.tv_sec) == sizeof (time_t) ? 1 : -1]; | |
69 | ]])], | |
70 | [gl_cv_sys_struct_timeval_tv_sec=yes], | |
71 | [gl_cv_sys_struct_timeval_tv_sec=no]) | |
72 | ]) | |
73 | if test $gl_cv_sys_struct_timeval_tv_sec != yes; then | |
74 | REPLACE_STRUCT_TIMEVAL=1 | |
75 | fi | |
76 | fi | |
77 | ||
78 | dnl Check for declarations of anything we want to poison if the | |
79 | dnl corresponding gnulib module is not in use. | |
80 | gl_WARN_ON_USE_PREPARE([[ | |
81 | #if HAVE_SYS_TIME_H | |
82 | # include <sys/time.h> | |
83 | #endif | |
84 | #include <time.h> | |
85 | ]], [gettimeofday]) | |
86 | ]) | |
87 | ||
88 | AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR], | |
89 | [ | |
90 | dnl Use AC_REQUIRE here, so that the default settings are expanded once only. | |
91 | AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) | |
92 | gl_MODULE_INDICATOR_SET_VARIABLE([$1]) | |
93 | dnl Define it also as a C macro, for the benefit of the unit tests. | |
94 | gl_MODULE_INDICATOR_FOR_TESTS([$1]) | |
95 | ]) | |
96 | ||
97 | AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS], | |
98 | [ | |
99 | GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY]) | |
100 | dnl Assume POSIX behavior unless another module says otherwise. | |
101 | HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY]) | |
102 | HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL]) | |
103 | HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H]) | |
104 | REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY]) | |
105 | REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL]) | |
106 | ]) |