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Re: About ./configure --cache-file (WAS: CHECK_STRUCTS/dmpstruct.h mecha

From: Daniel Colascione
Subject: Re: About ./configure --cache-file (WAS: CHECK_STRUCTS/dmpstruct.h mechanism is broken.)
Date: Sat, 13 Apr 2019 20:26:14 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 4/13/19 7:44 PM, Paul Eggert wrote:
Noam Postavsky wrote:
The cache is not invalidated automatically, so you need to delete it
after upgrading devel libraries or compiler.

... or if you configure with different flags, or if you edit configure.ac or if you do a bunch of other things. For the kind of work I do, the cache is way more trouble than it's worth.

The caching could probably be a lot better. We could incorporate a hash of the passed-in variables and of the environment into the cache file now. As for changing configure.ac itself: that's very rare. I also wonder CC="ccache gcc" might help even for the case of a frequently-changed configure.ac.

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