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Re: [v3] Fix race condition in libstdc++-v3/configure.ac

From: Paolo Bonzini <bonzini at gnu dot org>
To: Ralf Wildenhues <Ralf dot Wildenhues at gmx dot de>, gcc-patches at gcc dot gnu dot org, libstdc++ at gcc dot gnu dot org
Date: Tue, 01 Sep 2009 10:06:06 +0200
Subject: Re: [v3] Fix race condition in libstdc++-v3/configure.ac
References: <20090831212646.GA25211@gmx.de>

On 08/31/2009 11:26 PM, Ralf Wildenhues wrote:

I wasn't quite sure whether the 'cd include&&  make' is necessary each
time include/Makefile is changed, or only when config.status is invoked
without arguments (i.e., after configure runs).  The patch assumes the
latter and introduces a 'generate-headers' tag for this.

It seems safest to invoke "make -C include pch_build=" on every include/Makefile change, and leave the pch to be created by the recursive make invocation. In principle, the task of include/Makefile could be done all by AC_CONFIG_LINKS, but not pch creation.

Also, you probably need to modify the configure-[+prefix+][+module+] definition in the toplevel, and add a : $(MAKE) there.

Paolo

Follow-Ups:
- Re: [v3] Fix race condition in libstdc++-v3/configure.ac
  - From: Ralf Wildenhues

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