depend2.am

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Author : Tom Tromey
Date : 1998-10-01 01:36:35
Hash : eb7c20a1
Message : * depend2.am: Don't bother trying to delete source file from list.
depend2.am
## automake - create Makefile.in from Makefile.am
## Copyright (C) 1994, 1995, 1996, 1997, 1998 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, write to the Free Software
## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
%.o: %@EXT@
	@echo '$(@PFX@COMPILE) -c $<'; \
## There are various ways to get dependency output from gcc.  Here's
## why we pick this rather obscure method:
## - Don't want to use -MD because we'd like the dependencies to end
##   up in a subdir.  Having to rename by hand is ugly.
##   (We might end up doing this anyway to support other compilers.)
## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like
##   -MM, not -M (despite what the docs say).
## - Using -M directly means running the compiler twice (even worse
##   than renaming).
	$(@PFX@COMPILE) -Wp,-MD,.deps/$(*F).p -c $<
## This next piece of magic avoids the `deleted header file' problem.
## The problem is that when a header file which appears in a .P file
## is deleted, the dependency causes make to die (because there is
## typically no way to rebuild the header).  We avoid this by adding
## dummy dependencies for each header file.  Too bad gcc doesn't do
## this for us directly.
	@-tr '\\ ' '\n\n' < .deps/$(*F).p \
	  | sed -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/:/' \
	    > .deps/$(*F).P; \
	rm .deps/$(*F).p

%.lo: %@EXT@
	@echo '$(LT@PFX@COMPILE) -c $<'; \
## See above to understand implementation weirdness.
	$(LT@PFX@COMPILE) -Wp,-MD,.deps/$(*F).p -c $<
	@-sed -e 's/^\([^:]*\)\.o:/\1.lo \1.o:/' \
	  < .deps/$(*F).p > .deps/$(*F).P; \
## See above to understand deleted header file trick.
	tr '\\ ' '\n\n' < .deps/$(*F).p \
	  | sed -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/:/' \
## Note subtle difference: here we append to the .P file.
	    >> .deps/$(*F).P; \
	rm -f .deps/$(*F).p
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