| # serial 28 |
| |
| # Copyright (C) 2001-2003, 2005, 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. |
| |
| dnl From Jim Meyering. |
| |
| AC_DEFUN([gl_FUNC_GETTIMEOFDAY], |
| [ |
| AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) |
| AC_REQUIRE([AC_C_RESTRICT]) |
| AC_REQUIRE([AC_CANONICAL_HOST]) |
| AC_REQUIRE([gl_HEADER_SYS_TIME_H]) |
| AC_CHECK_FUNCS_ONCE([gettimeofday]) |
| |
| gl_gettimeofday_timezone=void |
| if test $ac_cv_func_gettimeofday != yes; then |
| HAVE_GETTIMEOFDAY=0 |
| else |
| AC_CACHE_CHECK([for gettimeofday with POSIX signature], |
| [gl_cv_func_gettimeofday_posix_signature], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#include <sys/time.h> |
| struct timeval c; |
| int gettimeofday (struct timeval *restrict, void *restrict); |
| ]], |
| [[/* glibc uses struct timezone * rather than the POSIX void * |
| if _GNU_SOURCE is defined. However, since the only portable |
| use of gettimeofday uses NULL as the second parameter, and |
| since the glibc definition is actually more typesafe, it is |
| not worth wrapping this to get a compliant signature. */ |
| int (*f) (struct timeval *restrict, void *restrict) |
| = gettimeofday; |
| int x = f (&c, 0); |
| return !(x | c.tv_sec | c.tv_usec); |
| ]])], |
| [gl_cv_func_gettimeofday_posix_signature=yes], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#include <sys/time.h> |
| int gettimeofday (struct timeval *restrict, struct timezone *restrict); |
| ]])], |
| [gl_cv_func_gettimeofday_posix_signature=almost], |
| [gl_cv_func_gettimeofday_posix_signature=no])])]) |
| if test $gl_cv_func_gettimeofday_posix_signature = almost; then |
| gl_gettimeofday_timezone='struct timezone' |
| elif test $gl_cv_func_gettimeofday_posix_signature != yes; then |
| REPLACE_GETTIMEOFDAY=1 |
| fi |
| dnl If we override 'struct timeval', we also have to override gettimeofday. |
| if test $REPLACE_STRUCT_TIMEVAL = 1; then |
| REPLACE_GETTIMEOFDAY=1 |
| fi |
| dnl On mingw, the original gettimeofday has only a precision of 15.6 |
| dnl milliseconds. So override it. |
| case "$host_os" in |
| mingw*) REPLACE_GETTIMEOFDAY=1 ;; |
| esac |
| fi |
| AC_DEFINE_UNQUOTED([GETTIMEOFDAY_TIMEZONE], [$gl_gettimeofday_timezone], |
| [Define this to 'void' or 'struct timezone' to match the system's |
| declaration of the second argument to gettimeofday.]) |
| ]) |
| |
| # Prerequisites of lib/gettimeofday.c. |
| AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [:]) |
