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f4d71054e7
* lib/unistd.in.h (truncate): New declaration. * lib/truncate.c: New file. * m4/truncate.m4: New file. * m4/unistd_h.m4 (gl_UNISTD_H): Test whether 'truncate' is declared. (gl_UNISTD_H_DEFAULTS): Initialize GNULIB_TRUNCATE, HAVE_TRUNCATE, REPLACE_TRUNCATE. * modules/unistd (Makefile.am): Substitute GNULIB_TRUNCATE, HAVE_TRUNCATE, REPLACE_TRUNCATE. * modules/truncate: New file. * tests/test-unistd-c++.cc (truncate): Test signature. * doc/posix-functions/truncate.texi: Mention the new module.
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
# truncate.m4 serial 1 -*- Autoconf -*-
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dnl Copyright (C) 2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_TRUNCATE],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_CHECK_FUNCS_ONCE([truncate])
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if test $ac_cv_func_truncate = yes; then
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m4_ifdef([gl_LARGEFILE], [
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AC_REQUIRE([AC_CANONICAL_HOST])
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case "$host_os" in
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mingw*)
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dnl Native Windows, and Large File Support is requested.
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dnl The mingw64 truncate64() function is based on ftruncate64(),
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dnl which is unreliable (it may delete the file, see
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dnl <http://mingw-w64.sourcearchive.com/documentation/2.0-1/ftruncate64_8c_source.html>).
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dnl Use gnulib's ftruncate() and truncate() implementation instead.
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REPLACE_TRUNCATE=1
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;;
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esac
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], [
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:
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])
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else
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HAVE_TRUNCATE=0
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fi
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])
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# Prerequisites of lib/truncate.c.
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AC_DEFUN([gl_PREREQ_TRUNCATE], [:])
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