depend2.am

这是一个自动生成MAKEFILE的工具。相信大家都听说过。在LINUX工程项目里是很好的帮手。希望对大家有点帮助。

## automake - create Makefile.in from Makefile.am
## Copyright (C) 1994-1998, 1999 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).pp -c $<
## This next piece of magic avoids the `deleted header file' problem.
## The problem is that when a header file which appears in a .P file
## is deleted, the dependency causes make to die (because there is
## typically no way to rebuild the header).  We avoid this by adding
## dummy dependencies for each header file.  Too bad gcc doesn't do
## this for us directly.
	@-cp .deps/$(*F).pp .deps/$(*F).P; \
	tr ' ' '\012' < .deps/$(*F).pp \
## Some versions of gcc put a space before the `:'.  On the theory
## that the space means something, we add a space to the output as
## well.
	  | sed -e 's/^\\$$//' -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/ :/' \
	    >> .deps/$(*F).P; \
	rm .deps/$(*F).pp

%.lo: %@EXT@
	@echo '$(LT@PFX@COMPILE) -c $<'; \
## See above to understand implementation weirdness.
	$(LT@PFX@COMPILE) -Wp,-MD,.deps/$(*F).pp -c $<
## Account for versions of gcc that put a space before the `:'.
	@-sed -e 's/^\([^:]*\)\.o[ 	]*:/\1.lo \1.o :/' \
	  < .deps/$(*F).pp > .deps/$(*F).P; \
## See above to understand deleted header file trick.
	tr ' ' '\012' < .deps/$(*F).pp \
## Some versions of gcc put a space before the `:'.  On the theory
## that the space means something, we add a space to the output as
## well.
	  | sed -e 's/^\\$$//' -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/ :/' \
	    >> .deps/$(*F).P; \
	rm -f .deps/$(*F).pp