| 1 | ## automake - create Makefile.in from Makefile.am
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| 2 | ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2003, 2004
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| 3 | ## Free Software Foundation, Inc.
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| 4 |
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| 5 | ## This program is free software; you can redistribute it and/or modify
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| 6 | ## it under the terms of the GNU General Public License as published by
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| 7 | ## the Free Software Foundation; either version 2, or (at your option)
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| 8 | ## any later version.
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| 9 |
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| 10 | ## This program is distributed in the hope that it will be useful,
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| 11 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | ## GNU General Public License for more details.
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| 14 |
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| 15 | ## You should have received a copy of the GNU General Public License
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| 16 | ## along with this program; if not, write to the Free Software
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| 17 | ## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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| 18 | ## 02110-1301, USA.
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| 19 |
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| 20 | ## Explicitly look in srcdir for benefit of non-GNU makes.
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| 21 |
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| 22 |
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| 23 | %CONFIG_H%: %STAMP%
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| 24 | ## Recover from removal of CONFIG_HEADER
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| 25 | @if test ! -f $@; then \
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| 26 | rm -f %STAMP%; \
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| 27 | $(MAKE) %STAMP%; \
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| 28 | else :; fi
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| 29 |
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| 30 |
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| 31 | %STAMP%: %CONFIG_H_DEPS% $(top_builddir)/config.status
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| 32 | @rm -f %STAMP%
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| 33 | cd $(top_builddir) && $(SHELL) ./config.status %CONFIG_H_PATH%
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| 34 |
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| 35 |
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| 36 | ## Only the first file of AC_CONFIG_HEADERS is assumed to be generated
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| 37 | ## by autoheader.
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| 38 | if %?FIRST%
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| 39 | %CONFIG_HIN%: %MAINTAINER-MODE% $(am__configure_deps) %FILES%
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| 40 | cd $(top_srcdir) && $(AUTOHEADER)
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| 41 | ## Whenever $(AUTOHEADER) has run, we must make sure that
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| 42 | ## ./config.status will rebuild config.h. The dependency from %STAMP%
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| 43 | ## on %CONFIG_H_DEPS% (which contains config.hin) is not enough to
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| 44 | ## express his.
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| 45 | ##
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| 46 | ## There are some tricky cases where this rule will build a
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| 47 | ## config.hin which has the same timestamp as %STAMP%, in which case
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| 48 | ## ./config.status will not be rerun (meaning that users will use in
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| 49 | ## out-of-date config.h without knowing it). One situation where this
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| 50 | ## can occurs is the following:
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| 51 | ## 1. the user updates some configure dependency (let's say foo.m4)
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| 52 | ## and run `make'
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| 53 | ## 2. the rebuild rules detect that a foo.m4 has changed,
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| 54 | ## run aclocal, autoconf, automake, and then run ./config.status.
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| 55 | ## (Note that autoheader hasn't been called yet, so ./config.status
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| 56 | ## outputs a config.h from an obsolete config.hin.)
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| 57 | ## 3. Once Makefile has been regenerated, make continues, and
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| 58 | ## discover that config.h is a dependency of the `all' rule.
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| 59 | ## Because config.h depends on stamp-h1, stamp-h1 depends on
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| 60 | ## config.hin, and config.hin depends on aclocal.m4, make runs
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| 61 | ## autoheader to rebuild config.hin.
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| 62 | ## Now make ought to call ./config.status once again to rebuild
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| 63 | ## config.h from the new config.hin, but if you have a sufficiently
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| 64 | ## fast box, steps 2 and 3 will occur within the same second: the
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| 65 | ## config.h/stamp-h1 generated from the outdated config.hin will have
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| 66 | ## the same mtime as the new config.hin. Hence make will think that
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| 67 | ## config.h is up to date.
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| 68 | ##
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| 69 | ## A solution is to erase %STAMP% here so that the %STAMP% rule
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| 70 | ## is always triggered after the this one.
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| 71 | rm -f %STAMP%
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| 72 | ## Autoheader has the bad habit of not changing the timestamp if
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| 73 | ## config.hin is unchanged, which breaks Make targets. Since what
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| 74 | ## must not changed gratuitously is config.h, which is already handled
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| 75 | ## by config.status, there is no reason to make things complex for
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| 76 | ## config.hin.
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| 77 | touch $@
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| 78 | endif %?FIRST%
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