Commit b768fb21 authored by Bruno Haible's avatar Bruno Haible

Update comments.

parent 85f8cf50
2008-07-08 Bruno Haible <bruno@clisp.org>
* m4/onceonly.m4: Update comments.
Reported by Ben Pfaff <blp@cs.stanford.edu>.
2008-07-04 Jim Meyering <meyering@redhat.com>
* users.txt: Add vc-dwim.
# onceonly.m4 serial 5
# onceonly.m4 serial 6
dnl Copyright (C) 2002-2003, 2005-2006, 2008 Free Software Foundation, Inc.
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License. As a special exception to the GNU General
......@@ -21,13 +21,16 @@ dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to
dnl empty, and the check will be inserted before the body of the AC_DEFUNed
dnl function.
dnl This is like onceonly.m4, except that it uses diversions to named sections
dnl DEFAULTS and INIT_PREPARE in order to check all requested headers at once,
dnl thus reducing the size of 'configure'. Works with autoconf-2.57. The
dnl size reduction is ca. 9%.
dnl The original code implemented AC_CHECK_HEADERS_ONCE and AC_CHECK_FUNCS_ONCE
dnl in terms of AC_DEFUN and AC_REQUIRE. This implementation uses diversions to
dnl named sections DEFAULTS and INIT_PREPARE in order to check all requested
dnl headers at once, thus reducing the size of 'configure'. It is known to work
dnl with autoconf 2.57..2.62 at least . The size reduction is ca. 9%.
dnl Autoconf version 2.59 plus gnulib is required; this file is not needed
dnl with Autoconf 2.60 or greater.
dnl with Autoconf 2.60 or greater. But note that autoconf's implementation of
dnl AC_CHECK_DECLS_ONCE expects a comma-separated list of symbols as first
dnl argument!
AC_PREREQ([2.59])
# AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
......
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