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From:	Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Should I use bash as default shell in makefiles?
Date:	Thu, 20 Dec 2001 21:41:55 +0000
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To:	djgpp AT delorie DOT com
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big10p AT hotmail DOT com (Chris Chadwick) wrote:

> DJ Delorie <dj AT delorie DOT com> wrote in message news:<200112200325 DOT fBK3P8528329 AT envy DOT delorie DOT com>...

> > http://www.delorie.com/gnu/docs/make/make_16.html talks about
> > automatic dependency generation, but that's more robust (and complex)
> > than most need.  For simple DJGPP Makefiles, just add -MMD to your gcc
> > options, and put this at the end of your Makefile:
> > 
> > DEPS=$(wildcard *.d)
> > ifneq ($(DEPS),)
> > include $(DEPS)
> > endif
> > 
> > And it's best to be simple anyway :-)

Even simpler then:

-include $(sources:.c=.d)

> The main reason I was thinking I'd have to use an alternative shell to
> command.com, was because of this example from the make docs:
> 
> %.d: %.c
>         $(SHELL) -ec '$(CC) -M $(CPPFLAGS) $< \
>               | sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \
>               [ -s $@ ] || rm -f $@'

I've never understood why the docs say that.  Is there a good reason for
all that effort to create the .d files?

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