Deletes logfiles in build dir with make clean

New patchset creating make log-clean.

Patchset 1 fixed issue 2415 by deleting all the logfiles created during make, make doc or make test.  The deletion is non-selective - running make clean, make doc clean or make test clean will delete all the logfiles created in the build tree.  However, that's lots simpler than trying to do be more selective and shouldn't cause a problem in the real world - the logfiles are really only of any use after a failed build.

[PhilEHolmes, 2012-06-11 13:07:23]

Please review.

[Graham Percival, 2012-06-12 04:33:27]

LGTM

[John Mandereau, 2012-06-12 12:30:59]

I'm not certain cleaning the build tree should include log files cleaning, when
a simple
"find -name '*.log' |xargs rm -f"
does the job.  However, if this is a very popular request, then you may want to
read a few comments.

http://codereview.appspot.com/6300079/diff/1/GNUmakefile.in
File GNUmakefile.in (right):

http://codereview.appspot.com/6300079/diff/1/GNUmakefile.in#newcode340
GNUmakefile.in:340: find . -name "*.log" -delete
I think something like "rm -f *test*.log" is enough here, we don't ask for
removing all "*.log" files of build tree by making test-clean, do we?

http://codereview.appspot.com/6300079/diff/1/stepmake/stepmake/generic-target...
File stepmake/stepmake/generic-targets.make (right):

http://codereview.appspot.com/6300079/diff/1/stepmake/stepmake/generic-target...
stepmake/stepmake/generic-targets.make:16: find . -name "*.log" -delete
make already recurses into subdirectories, so using find is superfluous, "rm -f
*.log" is enough.  Moreover, this would better go above $(LOOP) to preserve the
logic of cleaning a directory *then* its subdirectories.

http://codereview.appspot.com/6300079/diff/1/stepmake/stepmake/generic-target...
stepmake/stepmake/generic-targets.make:209: find . -name "*.log" -delete
This line is superfluous, as "$(MAKE) out=www clean" already executes actions
specified in "clean" target.

[PhilEHolmes, 2012-06-13 15:29:57]

Please review

[John Mandereau, 2012-06-14 11:23:52]

LGTM

[Graham Percival, 2012-06-16 07:19:17]

LGTM, and if you want to push it right now instead of waiting for the countdown
to officially end I think that's entirely fine.