Re: [PATCH 08/11] build: manually update bootstrap from gnulib, and adapt

[Akim Demaille]

Le 18 janv. 2012 à 22:10, Jim Meyering a écrit :

> [Side note, I liked how bison uses automake's subdir-objects feature
> (i.e., added efficiency of no recursive make invocations) enough that
> I've converted cppi to work the same way. ]

Actually that's not the only benefit: another very significant
one is the correctness of the dependencies across directories
(e.g., the doc/ man page depend on having the src/ binary ready to
run --help, which requires its lib/ library etc.).  Which
in turn provides more effective -j JOBS, since the less directories
you have, the less serialization you have. In the project I work
on at Gostai it makes a huge difference.

There's a cost though: the Makefile generated by Automake no
longer uses pattern-rules, but many replicated rules for each
target.  And then you can feel Make having a hard time loading
the file :(  I would really love an AUTOMAKE_OPTIONS = GNU-Make
that would use %-pattern rules and drop all this useless (for
me) overhead.