| # Configure a replacement for <sys/time.h>. |
| # serial 9 |
| |
| # Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc. |
| # This file is free software; the Free Software Foundation |
| # gives unlimited permission to copy and/or distribute it, |
| # with or without modifications, as long as this notice is preserved. |
| |
| # Written by Paul Eggert and Martin Lambers. |
| |
| AC_DEFUN([gl_HEADER_SYS_TIME_H], |
| [ |
| dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement |
| dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1 |
| dnl statements that occur in other macros. |
| AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY]) |
| ]) |
| |
| AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY], |
| [ |
| AC_REQUIRE([AC_C_RESTRICT]) |
| AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) |
| AC_CHECK_HEADERS_ONCE([sys/time.h]) |
| gl_CHECK_NEXT_HEADERS([sys/time.h]) |
| |
| if test $ac_cv_header_sys_time_h != yes; then |
| HAVE_SYS_TIME_H=0 |
| fi |
| |
| dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h> |
| dnl only. So include that header in the list. |
| gl_PREREQ_SYS_H_WINSOCK2 |
| AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#if HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| #include <time.h> |
| #if HAVE_WINSOCK2_H |
| # include <winsock2.h> |
| #endif |
| ]], |
| [[static struct timeval x; x.tv_sec = x.tv_usec;]])], |
| [gl_cv_sys_struct_timeval=yes], |
| [gl_cv_sys_struct_timeval=no]) |
| ]) |
| if test $gl_cv_sys_struct_timeval != yes; then |
| HAVE_STRUCT_TIMEVAL=0 |
| else |
| dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined |
| dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only |
| dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is |
| dnl smaller than the 'time_t' type mandated by POSIX. |
| dnl On OpenBSD 5.1 amd64, tv_sec is 64 bits and time_t 32 bits, but |
| dnl that is good enough. |
| AC_CACHE_CHECK([for wide-enough struct timeval.tv_sec member], |
| [gl_cv_sys_struct_timeval_tv_sec], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#if HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| #include <time.h> |
| #if HAVE_WINSOCK2_H |
| # include <winsock2.h> |
| #endif |
| ]], |
| [[static struct timeval x; |
| typedef int verify_tv_sec_type[ |
| sizeof (time_t) <= sizeof x.tv_sec ? 1 : -1 |
| ]; |
| ]])], |
| [gl_cv_sys_struct_timeval_tv_sec=yes], |
| [gl_cv_sys_struct_timeval_tv_sec=no]) |
| ]) |
| if test $gl_cv_sys_struct_timeval_tv_sec != yes; then |
| REPLACE_STRUCT_TIMEVAL=1 |
| fi |
| fi |
| |
| dnl Check for declarations of anything we want to poison if the |
| dnl corresponding gnulib module is not in use. |
| gl_WARN_ON_USE_PREPARE([[ |
| #if HAVE_SYS_TIME_H |
| # include <sys/time.h> |
| #endif |
| #include <time.h> |
| ]], [gettimeofday]) |
| ]) |
| |
| AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR], |
| [ |
| dnl Use AC_REQUIRE here, so that the default settings are expanded once only. |
| AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) |
| gl_MODULE_INDICATOR_SET_VARIABLE([$1]) |
| dnl Define it also as a C macro, for the benefit of the unit tests. |
| gl_MODULE_INDICATOR_FOR_TESTS([$1]) |
| ]) |
| |
| AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS], |
| [ |
| GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY]) |
| dnl Assume POSIX behavior unless another module says otherwise. |
| HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY]) |
| HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL]) |
| HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H]) |
| REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY]) |
| REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL]) |
| ]) |