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Subject: Re: [OMPI devel] make dependency problem?
From: Ralf Wildenhues (Ralf.Wildenhues_at_[hidden])
Date: 2008-12-07 07:23:07

Hello Eugene, Jeff,

the interesting data points here would be the dependency tracking scheme
selected by automake (CCDEPMODE in ompi/mca/bml/r2/Makefile), with and
without --enable-dependency-tracking passed to configure.

Also, the contents of ompi/mca/bml/r2/.deps/bml_r2.Plo, after ensuring
that a dependency tracking scheme other than "none" is selected, and
then removing bml_r2.o once and rebuilding.

Also, which compiler, and version, and which Solaris release?


* Jeff Squyres wrote on Tue, Dec 02, 2008 at 01:58:49PM CET:
> Weird -- the exact opposite happens for me (if I touch btl.h, it
> automatically rebuilds oodles of stuff, to include bml_r2.c).
> I have dim recollections of Automake disabling dependency tracking by
> default on Solaris+Solaris compilers (I don't remember the exact issue
> -- perhaps it was before AM supported the dependency format of the
> Solaris compilers...?). Have you tried configuring with --enable-
> dependency-tracking?
> On Nov 29, 2008, at 6:45 PM, Eugene Loh wrote:
>> I was playing with OMPI and I noticed that if I modified btl.h,
>> bml_r2.c did not automatically get rebuilt, even though it includes
>> btl.h. This caused me all sorts of unnecessary debugging troubles.
>> In the end, just touching bml_r2.c was enough... it caused bml_r2.c to
>> be recompiled and to see the changes in btl.h.
>> So, question:
>> Given that bml_rc.2 includes btl.h, wouldn't the proper make
>> dependencies cause bml_rc.c to be recompiled whenever btl.h is
>> touched?
>> Again, it appears that this is not happening and that strikes me as a
>> problem -- for someone out there to fix. :^)