1# Configure a replacement for <sys/time.h>. 2# serial 12 3 4# Copyright (C) 2007, 2009-2022 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 11AC_DEFUN_ONCE([gl_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_SYS_TIME_H_DEFAULTS]) 17 AC_REQUIRE([AC_C_RESTRICT]) 18 AC_CHECK_HEADERS_ONCE([sys/time.h]) 19 gl_CHECK_NEXT_HEADERS([sys/time.h]) 20 21 if test $ac_cv_header_sys_time_h != yes; then 22 HAVE_SYS_TIME_H=0 23 fi 24 25 dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h> 26 dnl only. So include that header in the list. 27 gl_PREREQ_SYS_H_WINSOCK2 28 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval], 29 [AC_COMPILE_IFELSE( 30 [AC_LANG_PROGRAM( 31 [[#if HAVE_SYS_TIME_H 32 #include <sys/time.h> 33 #endif 34 #include <time.h> 35 #if HAVE_WINSOCK2_H 36 # include <winsock2.h> 37 #endif 38 ]], 39 [[static struct timeval x; x.tv_sec = x.tv_usec;]])], 40 [gl_cv_sys_struct_timeval=yes], 41 [gl_cv_sys_struct_timeval=no]) 42 ]) 43 if test $gl_cv_sys_struct_timeval != yes; then 44 HAVE_STRUCT_TIMEVAL=0 45 else 46 dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined 47 dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only 48 dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is 49 dnl smaller than the 'time_t' type mandated by POSIX. 50 dnl On OpenBSD 5.1 amd64, tv_sec is 64 bits and time_t 32 bits, but 51 dnl that is good enough. 52 AC_CACHE_CHECK([for wide-enough struct timeval.tv_sec member], 53 [gl_cv_sys_struct_timeval_tv_sec], 54 [AC_COMPILE_IFELSE( 55 [AC_LANG_PROGRAM( 56 [[#if HAVE_SYS_TIME_H 57 #include <sys/time.h> 58 #endif 59 #include <time.h> 60 #if HAVE_WINSOCK2_H 61 # include <winsock2.h> 62 #endif 63 ]], 64 [[static struct timeval x; 65 typedef int verify_tv_sec_type[ 66 sizeof (time_t) <= sizeof x.tv_sec ? 1 : -1 67 ]; 68 ]])], 69 [gl_cv_sys_struct_timeval_tv_sec=yes], 70 [gl_cv_sys_struct_timeval_tv_sec=no]) 71 ]) 72 if test $gl_cv_sys_struct_timeval_tv_sec != yes; then 73 REPLACE_STRUCT_TIMEVAL=1 74 fi 75 fi 76 77 dnl Check for declarations of anything we want to poison if the 78 dnl corresponding gnulib module is not in use. 79 gl_WARN_ON_USE_PREPARE([[ 80#if HAVE_SYS_TIME_H 81# include <sys/time.h> 82#endif 83#include <time.h> 84 ]], [gettimeofday]) 85]) 86 87# gl_SYS_TIME_MODULE_INDICATOR([modulename]) 88# sets the shell variable that indicates the presence of the given module 89# to a C preprocessor expression that will evaluate to 1. 90# This macro invocation must not occur in macros that are AC_REQUIREd. 91AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR], 92[ 93 dnl Ensure to expand the default settings once only. 94 gl_SYS_TIME_H_REQUIRE_DEFAULTS 95 gl_MODULE_INDICATOR_SET_VARIABLE([$1]) 96 dnl Define it also as a C macro, for the benefit of the unit tests. 97 gl_MODULE_INDICATOR_FOR_TESTS([$1]) 98]) 99 100# Initializes the default values for AC_SUBSTed shell variables. 101# This macro must not be AC_REQUIREd. It must only be invoked, and only 102# outside of macros or in macros that are not AC_REQUIREd. 103AC_DEFUN([gl_SYS_TIME_H_REQUIRE_DEFAULTS], 104[ 105 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS], [ 106 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETTIMEOFDAY]) 107 ]) 108 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS]) 109 AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS]) 110]) 111 112AC_DEFUN([gl_SYS_TIME_H_DEFAULTS], 113[ 114 dnl Assume POSIX behavior unless another module says otherwise. 115 HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY]) 116 HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL]) 117 HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H]) 118 REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY]) 119 REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL]) 120]) 121