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bug#9106: 24.0.50; ./configure causes massive recompilation

From: Jan Djärv
Subject: bug#9106: 24.0.50; ./configure causes massive recompilation
Date: Mon, 18 Jul 2011 20:20:19 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:5.0) Gecko/20110624 Thunderbird/5.0

Glenn Morris skrev 2011-07-18 19.48:
Eli Zaretskii wrote:

Invocation of the `configure' script causes recompilation of many
source files, even though nothing has really changed.

Why do you want to re-run configure - can you get away with just `make'?
In principle, almost anything could have changed if you have re-run
configure (?). Eg you could in principle be compiling for a different
arch now. I'm not sure it's possible to distinguish those cases from
cases where nothing has really changed.

'make' after a bzr upd often runs configure nowdays.  More often than not.

        Jan D.

It looks like the cause is lib/Makefile which states that several
generated headers in that directory depend on config.status.  So each
`configure' causes those headers to be regenerated, which in turn
triggers many files using those headers to be recompiled.

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