MHR wrote:
Where I work, we have an application that has been merrily running
away (and being built) on FC1 (yes, you read that right).
One of my assignments is to bring this up to CentOS, but on my first
effort, I ran into this interesting "feature." The original build
process (FC1) uses mkdep to generate the dependency files that are
subsequently used by the makes to build the app. mkdep does not exist
in CentOS 5.2. There is a makedepend command that operates slightly
differently.
Can someone enlighten me on this, particularly w.r.t. 1) how do I use
makedepend to generate the same files mkdep did and is this a good
idea (my impression is that it's not really that hard but also not
necessarily a good idea or 2) convert all the makefiles to be
makedepend friendly (seems relatively easy, though fairly extensive,
but probably a better idea and also harmless should I wish/need to
continue to build on the FC1 system?
At some point a long time ago I was using makedep/makedepend, but I
replaced that with gcc -MM to generate the Makefile dependancies
automatically.
man gcc, search for -MM will tell you more.
Here's an excerpt from one of my project's Makefile, in case it helps.
#################################################################
# making the dependancy files
#################################################################
# each .c file has a corresponding .d file in the deps/ subdir.
# This .d file holds the dependancies for the .o.
# The .d is rebuilt automatically whenever the deps may have changed.
# the dependency files
# following only seems to work with gnu make, patsubst should be more
standard
#DEPS := $(SRCS:%.c=deps/%.d)
DEPS := $(patsubst %.c,deps/%.d,$(SRCS))
# rule to build the .d files
# the output of gcc -MM is something like:
# $ gcc -MM pools.c
# pools.o: pools.c config.h types.h pools.h fonc.h
# the perl line then changes this into:
# pools.o deps/pools.d: pools.c config.h types.h pools.h fonc.h
# Therefore each .d depends on all the files that the corresponding
# .o depends on, and will be rebuilt when necessary.
# I think this can be useful for conditional includes, for example
# if pools.c has a block:
# #ifdef GMP
# #include "gmp.h"
# #endif
# and GMP is defined in config.h...
deps/%.d: %.c
@echo rebuilding dependancy file $@
@$(SHELL) -ec '$(CC) -MM $(CFLAGS) $< | $(PERL) -e
'\''while(<>){s/^(.*)\.o:/$$1.o deps\/$$1.d:/g;print;}'\''> $@'
# include all dep files
include $(DEPS)
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