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Re: speedup bootstrap

From: Gary V. Vaughan
Subject: Re: speedup bootstrap
Date: Mon, 24 Oct 2005 11:55:17 +0100
User-agent: Mozilla Thunderbird 1.0 (X11/20050305)

Hallo Ralf,

Not wishing to be curmudgeonly... however:

Ralf Wildenhues wrote:
| OK to apply the combined patch below?

No, not okay!

I haven't tested the code yet, but I do remember that the areas you are
touching are exceedingly delicate.  And even though on a cursory look,
your patch looks sane, this is something to apply after 2.0!

Please rethink this judgement again.

I've thought again, and your patch is still outside of our 'fix bugs or
add tests between now and 2.0' credo.

 I deliberately tried for a minimal-invasive change;

I'm not disputing that; it's just that applying this change pushes back
the release a little further, and churns the code a little more.  We
have to draw the line somewhere, otherwise it is too easy to keep finding
more and more little improvements that it would be nice to put in before
the next release, and before we know it, that next release slips by
another 2 years.  I'm afraid I'm not even susceptible to the 'just this
one last change' argument... the faster we get 2.0 out the door and
shake the bugs out of it, the less effort we'll waste keeping 1.5.x
alive, and the sooner we can put our pet patches into the tree.

I have a whole list of things I want to see in 2.2 myself, some of them
already expressed as patches.  But let's not go there.

consistency-wise, it would probably be better to work
with m4 lists all the time instead of converting to and from; but my
patch actually keeps each of the three functions and their interfaces
the same.

ACK.  These are internal interfaces though, and while maintaining the
existing syntax and semantics at the interface layer reduces the
possibilty of forgetting something in one of the callers, cleanups
make the code more understandable and maintainable in the long term.

Also, it might be much more efficient to change _some_ of the code not
to use the dictionary lookup code: a list of tagged/non-tagged variables
may easily be updated in _LT_DECL already;  however, this is not a
minimal change, either.


On the other hand, thankyou very much for taking the time to fix this
problem!  I'm going to add your patch to my quilt series and enjoy the
speedup until 2.0 is done.  It'll also mean that I'll have been able to
give it a good workout before approving.

I can only rephrase: please rethink your post-2.0 judgement.  Tell me
what you need to be convinced (test suite tests for these functions,

Sorry, but I'm hell bent on focussing for the release.  Fantastic though
it will be to see a speedup in the bootstrap... it is a symptom of the
'just one more thing' creeping featurism that has been holding back our
release process for so long.

Please also remember that, if _you_ use this, the old version will not
be tested any more.  It might thus just as well break in between,
unnoticed, or be broken before, but breakage only uncovered later.

I meant that I will use it for my installed libtool, mainly for work
on M4.  I'll keep my libtool dev tree clean, except for the 2.0 patch

Gary V. Vaughan      ())_.  address@hidden,}
Research Scientist   ( '/
GNU Hacker           / )=
Technical Author   `(_~)_

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