Re: [Mingw-users] Re: Building MS-compatible object libraries

[Mikael A. <mik...@te...>]

Hi !

If I remeber correct alloca should be replaced with builtin_alloca or
something like that, if you search the archives for "alloca" you should find
it.

Mikael

----- Original Message ----- 
From: "Paul Moore" <pf_...@ya...>
To: <min...@li...>
Sent: Saturday, August 09, 2003 9:47 PM
Subject: [Mingw-users] Re: Building MS-compatible object libraries


> Earnie Boyd <ear...@ya...> writes:
> [About building MSVC-compatible libraries]
>
> > It should pose little to no problems.
>
> I did find one problem. I built the GMP library with Msys/mingw, and
> with that I was able to build some application code (the gmpy Python
> extension) with mingw, fine.
>
> But when I tried to build gmpy with MSVC, linking to libgmp.a, renamed
> gmp.lib, I got errors saying that there was an unresolved external,
> __alloca, from the GMP code.
>
> It looks like it's some form of discrepancy with how many underscores
> MSVC and gcc tack onto alloca(). The strange thing is, it seems to be
> *only* alloca that is the problem.
>
> Can you give me any suggestions on how to diagnose this? It seems like
> it's a GMP issue, as the mingw headers define alloca as
> __builtin_alloca, and so shouldn't need an extern, at all. But GMP
> does things to try to get a suitable alloca, and it tries
>
> # ifdef __GNUC__
> #  define alloca __builtin_alloca
>
> as it's first check. So that should be OK...
>
> It's not a big deal, in this case, as I can just build the Python
> extension with mingw, but I'd like to know what's going on. (Or is
> there a workaround by doing clever linker stuff to tell it to resolve
> __alloca as _alloca?)
>
> Thanks in advance,
> Paul.
> -- 
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