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+# Configure a replacement for <sys/time.h>.
+# serial 12
+
+# Copyright (C) 2007, 2009-2022 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_ONCE([gl_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_SYS_TIME_H_DEFAULTS])
+ AC_REQUIRE([AC_C_RESTRICT])
+ 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])
+])
+
+# gl_SYS_TIME_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
+AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
+[
+ dnl Ensure to expand the default settings once only.
+ gl_SYS_TIME_H_REQUIRE_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])
+])
+
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd. It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_TIME_H_REQUIRE_DEFAULTS],
+[
+ m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS], [
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETTIMEOFDAY])
+ ])
+ m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS])
+ AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_SYS_TIME_H_DEFAULTS],
+[
+ 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])
+])