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From: Lucretia <lucretia9@lycos.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Implementing an Ada compiler and libraries.
Date: 10 May 2007 10:42:50 -0700
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On May 10, 4:34 pm, Stefan Bellon <sbel...@sbellon.de> wrote:
> Gautier wrote:
> > - time stamps to check need of recompilations
>
> I've always wondered about the focussing on time stamps. I think the way
> to do it would be to calculate a hash sum (md5, sha1, ...) on the token
> stream without comments. This way you wouldn't have to recompile if you
> do layout and commentary changes, and even if you touch the file, you
> don't inadvertently trigger a recompilation.
>
> In fact, this is the idea of the "compilercache" project for C and C++:
> It intercepts calls to gcc/g++, builds a hash value on the
> concatenation of the command line (minus a few switches that do not
> influence code generation) and the preprocessed source and then stores
> the resulting object file in the cache with the name of the hash value.
> If the same hash value is to be compiled again, it is fetched from the
> cache and a lot of compilation time is saved.

Another really good idea ;D

Thanks,
Luke.