kc3-lang/automake/lib/am/remake-hdr.am

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• Hash : d7c1679b
  Author :
  Date : 2010-10-03T12:29:40
  

  Fix and document rules to not touch the tree with `make -n'.
  
  * doc/automake.texi (Multiple Outputs): Document the problem of
  modifications during dry-run execution, propose solution.
  * NEWS: Update.
  * automake.in (lang_vala_finish_target): Split recipe so the
  stamp file is not removed with GNU `make -n'.
  (lang_yacc_target_hook): Separate removal of parser output file
  and header remaking.
  * lib/am/lisp.am ($(am__ELCFILES)): Determine whether -n was
  passed to make, take care not to remove any files in that case.
  * lib/am/remake-hdr.am (%CONFIG_H%): Separate removal of
  %STAMP% file from induced remaking of config header.
  * tests/autohdrdry.test, tests/lispdry.test, tests/yaccdry.test:
  New tests.
  * tests/Makefile.am (TESTS): Update.
  
  Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
  

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• lib/am/remake-hdr.am

• ## automake - create Makefile.in from Makefile.am
  ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2003, 2004, 2005,
  ## 2008, 2009, 2010 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/>.
  
  ## Explicitly look in srcdir for benefit of non-GNU makes.
  
  
  %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%
  %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%
  

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