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