-# lseek.m4 serial 1
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# lseek.m4 serial 5
+dnl Copyright (C) 2007, 2009, 2010 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_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK([whether lseek detects pipes], [gl_cv_func_lseek_pipe],
- [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <unistd.h>],
-[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
-/* mingw mistakenly returns 0 when trying to seek on pipes. */
+ [if test $cross_compiling = no; then
+ AC_LINK_IFELSE([
+#include <sys/types.h> /* for off_t */
+#include <stdio.h> /* for SEEK_CUR */
+#include <unistd.h>
+int main ()
+{
+ /* Exit with success only if stdin is seekable. */
+ return lseek (0, (off_t)0, SEEK_CUR) < 0;
+}],
+ [if test -s conftest$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([
+#if ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__) || defined __BEOS__
+/* mingw and 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])])
+#endif],
+ [gl_cv_func_lseek_pipe=yes], [gl_cv_func_lseek_pipe=no])
+ fi])
if test $gl_cv_func_lseek_pipe = no; then
gl_REPLACE_LSEEK
fi
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
REPLACE_LSEEK=1
AC_DEFINE([LSEEK_PIPE_BROKEN], [1],
- [Define to 1 if lseek does not detect pipes.])
+ [Define to 1 if lseek does not detect pipes.])
])