Re: [Boost-users] bjam cross compilation using mingw32 doesn't use mingw32-ar ?

Subject: Re: [Boost-users] bjam cross compilation using mingw32 doesn't use mingw32-ar ?
From: Juergen Hunold (juergen.hunold_at_[hidden])
Date: 2009-02-22 14:27:11

Hi Volodya !

On Sunday 22 February 2009, Vladimir Prus wrote:

> > using gcc : 4.2 : /usr/bin/i586-mingw32msvc-g++
> >
> >             : # options
> >
> >                 <rc>i586-mingw32msvc-windres
> >                 <archiver>i586-mingw32msvc-ar
> >              ;
> >
> > You need to explicitly state <rc>, too. Else Boost.Build will
> > simply use the "null" fallback using an empty object file.
>
> Is there a bug report about this in some tracker?

No. And I'm not sure if this is actually a bug :-))
I had a hard time tracking this one, but it the end it was a classic 
"read and understand the docs" issue. You just have to do some more work 
for cross-compilation.
Anyway, I think my user-config.jam entry should be put into the 
Boost.Build docs. And without the path:
 using gcc : 4.2 : i586-mingw32msvc-g++
             : # options
            <rc>i586-mingw32msvc-windres
            <archiver>i586-mingw32msvc-ar
        ;

The key to all this might be related to my old friends "address-model" 
and "architecture" :-)): How to detect the target platform and which 
things to trigger .
In my case: detect that "i586-mingw32msvc-g++" is indeed a cross 
compiler, forcing "target-os=windows". And detecting the rest of the 
toolchain with prefix "i586-mingw32msvc-" and adjusting the toolset to do 
the right thing. And I think that this is quite hard at the moment while 
using bjam's limited regex engine. 
And remember: There are at least two packages involved: gcc and 
binutils. And in theory, you can configure both to use _different_ 
prefixes. But I doubt anyone will actually do this.

Yours,

Jürgen
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