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

From: Glenn Morris
Subject: bug#9106: 24.0.50; ./configure causes massive recompilation
Date: Mon, 18 Jul 2011 13:48:45 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

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.

> 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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