Mercurial > gnulib
view m4/lseek.m4 @ 40195:9734faea5d7b
relocatable-prog: Use wrapper-free installation also on Mac OS X 10.4.
* m4/relocatable.m4 (gl_RELOCATABLE_BODY): Treat Mac OS X 10.4 like 10.5.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 24 Feb 2019 00:25:02 +0100 |
parents | b06060465f09 |
children |
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# lseek.m4 serial 10 dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_LSEEK], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) AC_REQUIRE([AC_PROG_CC]) AC_CHECK_HEADERS_ONCE([unistd.h]) AC_CACHE_CHECK([whether lseek detects pipes], [gl_cv_func_lseek_pipe], [case "$host_os" in mingw*) dnl Native Windows. dnl The result of lseek (fd, (off_t)0, SEEK_CUR) or dnl SetFilePointer(handle, 0, NULL, FILE_CURRENT) dnl for a pipe depends on the environment: In a Cygwin 1.5 dnl environment it succeeds (wrong); in a Cygwin 1.7 environment dnl it fails with a wrong errno value. gl_cv_func_lseek_pipe=no ;; *) if test $cross_compiling = no; then AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include <sys/types.h> /* for off_t */ #include <stdio.h> /* for SEEK_CUR */ #if HAVE_UNISTD_H # include <unistd.h> #else /* on Windows with MSVC */ # include <io.h> #endif ]], [[ /* Exit with success only if stdin is seekable. */ return lseek (0, (off_t)0, SEEK_CUR) < 0; ]])], [if test -s conftest$ac_exeext \ && ./conftest$ac_exeext < conftest.$ac_ext \ && test 1 = "`echo hi \ | { ./conftest$ac_exeext; echo $?; cat >/dev/null; }`"; then gl_cv_func_lseek_pipe=yes else gl_cv_func_lseek_pipe=no fi ], [gl_cv_func_lseek_pipe=no]) else AC_COMPILE_IFELSE( [AC_LANG_SOURCE([[ #if defined __BEOS__ /* BeOS mistakenly return 0 when trying to seek on pipes. */ Choke me. #endif]])], [gl_cv_func_lseek_pipe=yes], [gl_cv_func_lseek_pipe=no]) fi ;; esac ]) if test $gl_cv_func_lseek_pipe = no; then REPLACE_LSEEK=1 AC_DEFINE([LSEEK_PIPE_BROKEN], [1], [Define to 1 if lseek does not detect pipes.]) fi AC_REQUIRE([gl_SYS_TYPES_H]) if test $WINDOWS_64_BIT_OFF_T = 1; then REPLACE_LSEEK=1 fi ])