On 05/24/2012 09:23 AM, David Ostrovsky wrote:
I'm thinking about another magic configure option, like
--with-external-lib-directory=/opt/libo
this would install all dependend libs to this directory during first
build and this would *survive* the make clean
call, so the next time all external lib artifacts would be reused from
there.

The line what to keep across a "make clean" and what to through away could be a gray one. On the one hand, some low-level LO modules (e.g., soltools) do not really change much these days, so you could argue to not rebuild them, either. On the other hand, the external modules *do* depend on LO code (its build machinery), so not re-building them after a "make clean" is unsound if you modified any LO code they depend on.

In the end, I'd question why you do "make clean" anyway, if you are after fast build times. These days, our dependency tracking has apparently become fine enough that there are hardly any apparent build failures resulting from missing dependencies any longer.

(And, btw, most of the --with-external-libs should work just fine. You typically only need a few select --without-external-* overrides.)

Stephan
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