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Re: A quick idea about dependencies w.r.t. files depending on `nodist_..

From: Ralf Wildenhues
Subject: Re: A quick idea about dependencies w.r.t. files depending on `nodist_...' files
Date: Thu, 18 May 2006 07:12:45 +0200
User-agent: Mutt/1.5.11+cvs20060403

Hi Thomas,

* Thomas Schwinge wrote on Thu, May 18, 2006 at 01:42:39AM CEST:
> The following idea might already have been discussed.  I did not do
> extensive research.  If it was, please tell me and point me to it.

Well, I think every now and then someone comes and suggests

> Corrently code like the following...
> foo.c
> #v+
> [...]
> #include "bar.h"
> [...]
> #v-
> ...--where `bar.h' is a `nodist_...' file, i.e. is generated by the build
> system and is not shipped among the source files--is a bit problematic
> when using Automake.  If not explicitly told, Automake doesn't (can't)
> know that `foo.c' depends on `bar.h' prior to trying to compile `foo.c',
> while will--of course--fail if `bar.h' hasn't been built before, be it by
> chance or by an stating an explicit dependecy of `foo.c' on `bar.h'.

Solved by using BUILT_SOURCES.  Yes, I know BUILT_SOURCES isn't the
greatest solution, but works well enough for many uses.

> When creating the files that'll be overwritten afterwards to hold the
> source files's actual dependencies, `config.status' currently only puts
> ``# dummy'' into e.g. `.deps/foo.Po'.

> What if `config.status' didn't put ``# dummy'' into these files, but
> ``$(DIST_SOURCES): $(filter-out $(DIST_SOURCES),$(SOURCES)'' instead?
> Shouldn't that solve the above problem?

filter-out is GNU make-specific.


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