121 lines
4.3 KiB
Plaintext
121 lines
4.3 KiB
Plaintext
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# Configure a replacement for <sys/time.h>.
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# serial 12
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# Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert and Martin Lambers.
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AC_DEFUN_ONCE([gl_SYS_TIME_H],
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[
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dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
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dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
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dnl statements that occur in other macros.
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AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS])
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AC_REQUIRE([AC_C_RESTRICT])
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AC_CHECK_HEADERS_ONCE([sys/time.h])
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gl_CHECK_NEXT_HEADERS([sys/time.h])
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if test $ac_cv_header_sys_time_h != yes; then
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HAVE_SYS_TIME_H=0
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fi
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dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h>
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dnl only. So include that header in the list.
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gl_PREREQ_SYS_H_WINSOCK2
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AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <time.h>
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#if HAVE_WINSOCK2_H
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# include <winsock2.h>
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#endif
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]],
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[[static struct timeval x; x.tv_sec = x.tv_usec;]])],
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[gl_cv_sys_struct_timeval=yes],
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[gl_cv_sys_struct_timeval=no])
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])
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if test $gl_cv_sys_struct_timeval != yes; then
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HAVE_STRUCT_TIMEVAL=0
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else
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dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined
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dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only
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dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is
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dnl smaller than the 'time_t' type mandated by POSIX.
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dnl On OpenBSD 5.1 amd64, tv_sec is 64 bits and time_t 32 bits, but
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dnl that is good enough.
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AC_CACHE_CHECK([for wide-enough struct timeval.tv_sec member],
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[gl_cv_sys_struct_timeval_tv_sec],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <time.h>
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#if HAVE_WINSOCK2_H
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# include <winsock2.h>
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#endif
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]],
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[[static struct timeval x;
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typedef int verify_tv_sec_type[
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sizeof (time_t) <= sizeof x.tv_sec ? 1 : -1
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];
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]])],
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[gl_cv_sys_struct_timeval_tv_sec=yes],
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[gl_cv_sys_struct_timeval_tv_sec=no])
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])
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if test $gl_cv_sys_struct_timeval_tv_sec != yes; then
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REPLACE_STRUCT_TIMEVAL=1
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fi
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fi
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use.
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gl_WARN_ON_USE_PREPARE([[
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#if HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <time.h>
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]], [gettimeofday])
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])
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# gl_SYS_TIME_MODULE_INDICATOR([modulename])
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# sets the shell variable that indicates the presence of the given module
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# to a C preprocessor expression that will evaluate to 1.
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# This macro invocation must not occur in macros that are AC_REQUIREd.
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AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
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[
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dnl Ensure to expand the default settings once only.
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gl_SYS_TIME_H_REQUIRE_DEFAULTS
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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])
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# Initializes the default values for AC_SUBSTed shell variables.
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# This macro must not be AC_REQUIREd. It must only be invoked, and only
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# outside of macros or in macros that are not AC_REQUIREd.
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AC_DEFUN([gl_SYS_TIME_H_REQUIRE_DEFAULTS],
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[
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m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS], [
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETTIMEOFDAY])
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])
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m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS])
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AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS])
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])
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AC_DEFUN([gl_SYS_TIME_H_DEFAULTS],
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[
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dnl Assume POSIX behavior unless another module says otherwise.
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HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY])
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HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL])
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HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H])
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REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY])
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REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL])
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])
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