-#serial 7
+# serial 20
-# See if we need to emulate a missing ftruncate function using fcntl or chsize.
+# See if we need to emulate a missing ftruncate function using chsize.
-# Copyright (C) 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
+# Copyright (C) 2000-2001, 2003-2007, 2009-2013 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.
AC_DEFUN([gl_FUNC_FTRUNCATE],
[
- AC_REPLACE_FUNCS(ftruncate)
- if test $ac_cv_func_ftruncate = no; then
- gl_PREREQ_FTRUNCATE
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([ftruncate])
+ if test $ac_cv_func_ftruncate = yes; then
+ m4_ifdef([gl_LARGEFILE], [
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ case "$host_os" in
+ mingw*)
+ dnl Native Windows, and Large File Support is requested.
+ dnl The MSVCRT _chsize() function only accepts a 32-bit file size,
+ dnl and the mingw64 ftruncate64() function is unreliable (it may
+ dnl delete the file, see
+ dnl <http://mingw-w64.sourcearchive.com/documentation/2.0-1/ftruncate64_8c_source.html>).
+ dnl Use gnulib's ftruncate() implementation instead.
+ REPLACE_FTRUNCATE=1
+ ;;
+ esac
+ ], [
+ :
+ ])
+ else
+ HAVE_FTRUNCATE=0
fi
])
# Prerequisites of lib/ftruncate.c.
AC_DEFUN([gl_PREREQ_FTRUNCATE],
[
- AC_CHECK_HEADERS_ONCE(unistd.h)
- AC_CHECK_FUNCS(chsize)
+ AC_CHECK_FUNCS([chsize])
])