diff options
Diffstat (limited to 'm4/lseek.m4')
| -rw-r--r-- | m4/lseek.m4 | 80 |
1 files changed, 51 insertions, 29 deletions
diff --git a/m4/lseek.m4 b/m4/lseek.m4 index f6452f6..df9302a 100644 --- a/m4/lseek.m4 +++ b/m4/lseek.m4 @@ -1,5 +1,5 @@ -# lseek.m4 serial 6 -dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc. +# lseek.m4 serial 10 +dnl Copyright (C) 2007, 2009-2013 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. @@ -7,43 +7,65 @@ 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], - [if test $cross_compiling = no; then - AC_LINK_IFELSE([AC_LANG_PROGRAM([[ + [case "$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 $cross_compiling = no; then + AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include <sys/types.h> /* for off_t */ #include <stdio.h> /* for SEEK_CUR */ -#include <unistd.h>]], [[ +#if HAVE_UNISTD_H +# include <unistd.h> +#else /* on Windows with MSVC */ +# include <io.h> +#endif +]], [[ /* Exit with success only if stdin is seekable. */ return lseek (0, (off_t)0, SEEK_CUR) < 0; ]])], - [if test -s conftest$ac_exeext \ - && ./conftest$ac_exeext < conftest.$ac_ext \ - && test 1 = "`echo hi \ - | { ./conftest$ac_exeext; echo $?; cat >/dev/null; }`"; then - gl_cv_func_lseek_pipe=yes - else - gl_cv_func_lseek_pipe=no - fi], - [gl_cv_func_lseek_pipe=no]) - else - AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ -#if ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__) || defined __BEOS__ -/* mingw and BeOS mistakenly return 0 when trying to seek on pipes. */ + [if test -s conftest$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]) + [gl_cv_func_lseek_pipe=yes], [gl_cv_func_lseek_pipe=no]) + fi + ;; + esac + ]) if test $gl_cv_func_lseek_pipe = no; then - gl_REPLACE_LSEEK + REPLACE_LSEEK=1 + AC_DEFINE([LSEEK_PIPE_BROKEN], [1], + [Define to 1 if lseek does not detect pipes.]) fi -]) -AC_DEFUN([gl_REPLACE_LSEEK], -[ - AC_LIBOBJ([lseek]) - AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) - REPLACE_LSEEK=1 - AC_DEFINE([LSEEK_PIPE_BROKEN], [1], - [Define to 1 if lseek does not detect pipes.]) + AC_REQUIRE([gl_SYS_TYPES_H]) + if test $WINDOWS_64_BIT_OFF_T = 1; then + REPLACE_LSEEK=1 + fi ]) |