X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fgettimeofday.m4;h=ce246e18bc2b7d452c19d56818f4527abd7f07f1;hb=HEAD;hp=0fec7d42b7c7dfcca7f73e679b849b351d2b8315;hpb=785cdec4450a1459fdbb90df1344b69be34e0059;p=debian%2Ftar diff --git a/m4/gettimeofday.m4 b/m4/gettimeofday.m4 index 0fec7d42..ce246e18 100644 --- a/m4/gettimeofday.m4 +++ b/m4/gettimeofday.m4 @@ -1,6 +1,6 @@ -# serial 12 +# serial 21 -# Copyright (C) 2001-2003, 2005, 2007, 2009 Free Software Foundation, Inc. +# Copyright (C) 2001-2003, 2005, 2007, 2009-2015 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. @@ -11,33 +11,66 @@ AC_DEFUN([gl_FUNC_GETTIMEOFDAY], [ AC_REQUIRE([AC_C_RESTRICT]) AC_REQUIRE([gl_HEADER_SYS_TIME_H]) + AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) AC_CHECK_FUNCS_ONCE([gettimeofday]) - AC_CACHE_CHECK([for gettimeofday with POSIX signature], - [gl_cv_func_gettimeofday_posix_signature], - [AC_COMPILE_IFELSE( - [AC_LANG_PROGRAM( - [[#include - struct timeval c; - ]], - [[ - 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], - [gl_cv_func_gettimeofday_posix_signature=no])]) - - gl_FUNC_GETTIMEOFDAY_CLOBBER - - if test $gl_cv_func_gettimeofday_posix_signature != yes; then - REPLACE_GETTIMEOFDAY=1 - SYS_TIME_H=sys/time.h - if test $gl_cv_func_gettimeofday_clobber != yes; then - AC_LIBOBJ([gettimeofday]) - gl_PREREQ_GETTIMEOFDAY + gl_gettimeofday_timezone=void + if test $ac_cv_func_gettimeofday != yes; then + HAVE_GETTIMEOFDAY=0 + else + gl_FUNC_GETTIMEOFDAY_CLOBBER + AC_CACHE_CHECK([for gettimeofday with POSIX signature], + [gl_cv_func_gettimeofday_posix_signature], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include + 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 +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 $REPLACE_STRUCT_TIMEVAL = 1; then + REPLACE_GETTIMEOFDAY=1 fi + m4_ifdef([gl_FUNC_TZSET_CLOBBER], [ + gl_FUNC_TZSET_CLOBBER + case "$gl_cv_func_tzset_clobber" in + *yes) + REPLACE_GETTIMEOFDAY=1 + gl_GETTIMEOFDAY_REPLACE_LOCALTIME + AC_DEFINE([tzset], [rpl_tzset], + [Define to rpl_tzset if the wrapper function should be used.]) + AC_DEFINE([TZSET_CLOBBERS_LOCALTIME], [1], + [Define if tzset clobbers localtime's static buffer.]) + ;; + esac + ]) fi + AC_DEFINE_UNQUOTED([GETTIMEOFDAY_TIMEZONE], [$gl_gettimeofday_timezone], + [Define this to 'void' or 'struct timezone' to match the system's + declaration of the second argument to gettimeofday.]) ]) @@ -51,47 +84,51 @@ dnl the wrapper functions that work around the problem. AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER], [ AC_REQUIRE([gl_HEADER_SYS_TIME_H]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer], [gl_cv_func_gettimeofday_clobber], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( - [[#include - #include - #include - #include - ]], - [[ - time_t t = 0; - struct tm *lt; - struct tm saved_lt; - struct timeval tv; - lt = localtime (&t); - saved_lt = *lt; - gettimeofday (&tv, NULL); - return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0; - ]])], + [[#include + #include + #include + #include + ]], + [[ + time_t t = 0; + struct tm *lt; + struct tm saved_lt; + struct timeval tv; + lt = localtime (&t); + saved_lt = *lt; + gettimeofday (&tv, NULL); + return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0; + ]])], [gl_cv_func_gettimeofday_clobber=no], [gl_cv_func_gettimeofday_clobber=yes], - dnl When crosscompiling, assume it is broken. - [gl_cv_func_gettimeofday_clobber=yes])]) + [# When cross-compiling: + case "$host_os" in + # Guess all is fine on glibc systems. + *-gnu*) gl_cv_func_gettimeofday_clobber="guessing no" ;; + # If we don't know, assume the worst. + *) gl_cv_func_gettimeofday_clobber="guessing yes" ;; + esac + ])]) - if test $gl_cv_func_gettimeofday_clobber = yes; then - REPLACE_GETTIMEOFDAY=1 - SYS_TIME_H=sys/time.h - gl_GETTIMEOFDAY_REPLACE_LOCALTIME - AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1], - [Define if gettimeofday clobbers the localtime buffer.]) - fi + case "$gl_cv_func_gettimeofday_clobber" in + *yes) + REPLACE_GETTIMEOFDAY=1 + gl_GETTIMEOFDAY_REPLACE_LOCALTIME + AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1], + [Define if gettimeofday clobbers the localtime buffer.]) + ;; + esac ]) AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [ - AC_LIBOBJ([gettimeofday]) - gl_PREREQ_GETTIMEOFDAY - AC_DEFINE([gmtime], [rpl_gmtime], - [Define to rpl_gmtime if the replacement function should be used.]) - AC_DEFINE([localtime], [rpl_localtime], - [Define to rpl_localtime if the replacement function should be used.]) + REPLACE_GMTIME=1 + REPLACE_LOCALTIME=1 ]) # Prerequisites of lib/gettimeofday.c.