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Re: configure speedup proposal: add --assume-c99 and --assume-posix2008

From: Paul Eggert
Subject: Re: configure speedup proposal: add --assume-c99 and --assume-posix2008 flags
Date: Fri, 06 Jun 2014 07:48:21 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Rhys Ulerich wrote:
I only find the configure process to be frustratingly slow when run
against compilers with license keys or with checks accessing network

That's not my experience at all. Take the bleeding-edge version of GNU grep, say, which I just now happened to be working on. On my platform (RHEL 6.5 x86-64, GCC 4.9.0, dual Xeon E5620), 'configure' takes 32 seconds real-time, whereas 'make -j8' takes 3 seconds.

No doubt there are environments where compilation is slow and 'configure' is not the bottleneck, but these days it's veerrry common for 'configure' to be an unreasonably large part of the build process, and where parallelizing would help.

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