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Re: Advanced Auto-Dependency Generation

From: Greg Kilfoyle
Subject: Re: Advanced Auto-Dependency Generation
Date: Tue, 12 Apr 2005 10:23:43 -0700

The rule listed shows commas after -MD and -MT which should not be there
... sorry.

Cheers, Greg.

On Tue, 2005-04-12 at 09:36, Greg Kilfoyle wrote:
> Hi,
> I have implemented dependency generation based on the information from
> this web page:
> It works great, but my implementation has one serious drawback that I
> don't see covered ... maybe I just missed something.
> Let's say I have just done a complete build and everything is up-to-
> date. I then manually remove a dependency file for a particular .c file
> and update a header file that the .c file is dependent on. If I then run
> make, the .c file is not rebuilt.
> I had a depclean target in our environment, which I removed because of
> this problem. But I can't protect against someone 'accidently' removing
> a dependency file.
> The following is a brief version of our .c->.o rule:
> $(objs): $(objdir)/%.o: $(srcdir)/%.c
>         gcc -c -MP -MD,$(basename $@).d -MT,'$@ $(basename $@).d'
>             -o $@ $<
> ...after this rule there is an include of the dependency file(s) using
> '-' so it can silently fail.
> Is this something I've failed to account for in my implementation or
> something that is missing from the proposed implementation method?
> Cheers, Greg.
Greg Kilfoyle <address@hidden>

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