Re: Build process

On 3/6/07, oe <[email protected]> wrote:
>
> I don't understand which
> problem is solved by makedeps. I thought it was motivated by
> shortcomings of the C++ environments in the 1990s, maybe. What I
> remember is that makedeps takes the information from the includeDBs
> and figures out the right sequence of #include statements; plus, when
> a single inclde file is used in more than N source files, it's moved
> to the preocompiled header.

I'm not quite sure as well. I used to think that to use precompiled
headers, there must be only one #include in the beginning of the unit,
wich explained the use of makedeps, but that was me wondering. All I
know is that there are conditions to be met to use pch.

> When I wrote the Perl skript, it turned out that the include DBs where
> missing some include depenmdencies; I guess the headers where "just
> there" because they where already in the big precompiled include
> header "by accident", so nobody noticed the new dependency and updated
> the includeDBs. Soo, I lost the plot a bit.. I don't know if
> precompiled header that crucial for development.

I couldn't tell either. But I noticed that the MinGW compilation (w/o
pch) takes substantially more time comparing with the VC++ compilation
(with precompiled headers).

> One could create a
> precompiled header file containing the most used headers, either from
> includeDBs or by extracting the information from the source files. Ah,
> and IIRC, makedeps doesn't "make deps", but I saw that GCC has an
> option to automatically create deps from #include directives (-M).
>
> Well, after all, makedeps does the job, and there was more interesting
> stuff to work on. And Dave Raymer wrote, he also edited the includeDBs
> as GCC requires still different includes -- guess I basically wasted
> some time ;)
>

Sounds familiar ;)
I have done all sorts of crazy things trying to understand and fix my
MinGW build.

-- 
Thiago Silva
Email: [email protected]
Jabber: [email protected]
Blog: http://sourcecraft.info/blog

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