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111 lines
3.8 KiB
111 lines
3.8 KiB
# Configure a replacement for <sys/time.h>. |
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# serial 8 |
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# Copyright (C) 2007, 2009-2017 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([gl_HEADER_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_HEADER_SYS_TIME_H_BODY]) |
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]) |
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AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY], |
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[ |
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AC_REQUIRE([AC_C_RESTRICT]) |
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AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) |
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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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AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR], |
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[ |
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dnl Use AC_REQUIRE here, so that the default settings are expanded once only. |
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AC_REQUIRE([gl_HEADER_SYS_TIME_H_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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AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS], |
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[ |
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GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY]) |
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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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HAVE_TIMEZONE_T=0; AC_SUBST([HAVE_TIMEZONE_T]) |
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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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