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Date: Thu, 18 Oct 2012 22:12:24 -0500
From: Michael Roth <mdroth@linux.vnet.ibm.com>
Message-ID: <20121019031224.GY16157@illuin>
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Subject: Re: [Qemu-devel] [PATCH v4 26/26] qidl: unit tests and build
	infrastructure
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: kwolf@redhat.com, peter.maydell@linaro.org, aliguori@us.ibm.com, qemu-devel@nongnu.org, blauwirbel@gmail.com

On Tue, Oct 16, 2012 at 09:21:05AM +0200, Paolo Bonzini wrote:
> Il 15/10/2012 18:37, Michael Roth ha scritto:
> > There is another way to do this (still using a "dummy" target)  that is a
> > bit less cryptic:
> > 
> > QIDL-PP-%: %.c qidl.h ...
> >     <grep and create %.qidl.c>
> > 
> > %.o: QIDL-PP-%
> >     <build normal or qidl CC>
> > 
> > But make detects that QIDL-PP-% is an intermediate target and removes
> > the *.qidl.c files after the build
> 
> How so?  Make does not even _know_ that %.qidl.c exists.

Sorry, wasn't remembering things correctly. That's how I had things
working *before* I'd switched to using qidl-generated subdirs, and it
was actually this:

 %.qidl.c: %.c qidl.h ...
     <grep and create %.qidl.c>
 
 %.o: %.c %.qidl.c
     <build normal or qidl CC>

which isn't doing anything special.

This is actually what I ended up going back to in v5 due to some issues
I noticed after fixing the bogus rm -f %.qidl.* call you caught. Using
.SECONDARY: addresses the issue I had with it deleting intermediate
(*.qidl.c) files.
> 
> Paolo
>