## automake - create Makefile.in from Makefile.am ## Copyright (C) 1994-2013 Free Software Foundation, Inc. ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## This program is distributed in the hope that it will be useful, ## but WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## You should have received a copy of the GNU General Public License ## along with this program. If not, see <http://www.gnu.org/licenses/>. %CONFIG_H%: %STAMP% ## Recover from removal of CONFIG_HEADER. @if test ! -f $@; then rm -f %STAMP%; else :; fi @if test ! -f $@; then $(MAKE) $(AM_MAKEFLAGS) %STAMP%; else :; fi %STAMP%: %CONFIG_H_DEPS% $(top_builddir)/config.status @rm -f %STAMP% cd $(top_builddir) && $(SHELL) ./config.status %CONFIG_H_PATH% ## Only the first file of AC_CONFIG_HEADERS is assumed to be generated ## by autoheader. if %?FIRST-HDR% %CONFIG_HIN%: %MAINTAINER-MODE% $(am__configure_deps) %FILES% ## Cater to parallel BSD make. ($(am__cd) $(top_srcdir) && $(AUTOHEADER)) ## Whenever $(AUTOHEADER) has run, we must make sure that ## ./config.status will rebuild config.h. The dependency from %STAMP% ## on %CONFIG_H_DEPS% (which contains config.hin) is not enough to ## express this. ## ## There are some tricky cases where this rule will build a ## config.hin which has the same timestamp as %STAMP%, in which case ## ./config.status will not be rerun (meaning that users will use an ## out-of-date config.h without knowing it). One situation where this ## can occur is the following: ## 1. the user updates some configure dependency (let's say foo.m4) ## and runs 'make'; ## 2. the rebuild rules detect that a foo.m4 has changed, ## run aclocal, autoconf, automake, and then run ./config.status. ## (Note that autoheader hasn't been called yet, so ./config.status ## outputs a config.h from an obsolete config.hin); ## 3. once Makefile has been regenerated, make continues, and ## discovers that config.h is a dependency of the 'all' rule. ## Because config.h depends on stamp-h1, stamp-h1 depends on ## config.hin, and config.hin depends on aclocal.m4, make runs ## autoheader to rebuild config.hin. ## Now make ought to call ./config.status once again to rebuild ## config.h from the new config.hin, but if you have a sufficiently ## fast box, steps 2 and 3 will occur within the same second: the ## config.h/stamp-h1 generated from the outdated config.hin will have ## the same mtime as the new config.hin. Hence make will think that ## config.h is up to date. ## ## A solution is to erase %STAMP% here so that the %STAMP% rule ## is always triggered after the this one. rm -f %STAMP% ## Autoheader has the bad habit of not changing the timestamp if ## config.hin is unchanged, which breaks Make targets. Since what ## must not changed gratuitously is config.h, which is already handled ## by config.status, there is no reason to make things complex for ## config.hin. touch $@ endif %?FIRST-HDR%