Re: [PATCH v2] build: do not automatically reconfigure unless configure.ac changed

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Jonathan Nieder wrote:

> Starting with v1.7.12-rc0~4^2 (build: reconfigure automatically if
> configure.ac changes, 2012-07-19), configure is automatically run
> every time the "configure" script changes.  In particular, that
> means configure is automatically rerun whenever the version number
> changes (which changes the configure script to support "./configure
> --helpe")

Gah, I sent the log commit message --- the patch description from v1
is the right one.  Sorry for the trouble.  Here is the fixed
description again.

Subject: build: do not automatically reconfigure unless configure.ac changed

Starting with v1.7.12-rc0~4^2 (build: reconfigure automatically if
configure.ac changes, 2012-07-19), "config.status --recheck" is
automatically run every time the "configure" script changes.  In
particular, that means the configuration procedure repeats whenever
the version number changes (since the configure script changes to
support "./configure --version" and "./configure --help"), making
bisecting painfully slow.

The intent was to make the reconfiguration process only trigger for
changes to configure.ac's logic.  Tweak the Makefile rule to match
that intent by depending on configure.ac instead of configure.

Reported-by: Martin von Zweigbergk <martinvonz@xxxxxxxxx>
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
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