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[Caml-list] Building large and portable projects
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Date: 2003-11-23 (18:22)
From: skaller <skaller@o...>
Subject: Re: [Caml-list] Building large and portable projects
On Sun, 2003-11-23 at 14:25, Nicolas Cannasse wrote:

> That's true doing a hashing is nice for C, but ocaml compilation is fast
> enough so maybe the time difference between making the hash and compiling is
> not so big. Another issue is storing the hashing in a temp file, while you
> can compare directly time stamps of the object with the source. Actually the
> only case were hashing is useful compare to timestamps is when a file is
> only touched ( am I wrong ? ). This is not an average case, and when it's
> happening juste compiling only this file (without a bunch of .h) seems fast
> enough.

Perhaps we should create a Sourceforge project?
Or add a new CVS module to ExtLib project?

BTW: one use of hashing is a language specific
*content* hash. This is something that can ignore
whitespaces and comments for example.

For C and C++, the compiler is slow and hashing
could be worth it.

For Ocaml, the compiler is fast BUT there is
a strict ordering requirement not present
in C which means a file close to the "start"
of a dependency graph is worth hashing to avoid
recompiling not just that file .. but all the
others after it: Ocaml separate compilation isn't
quite as 'separate' as C's :-)

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