Hi, thanks to Marc for the answer, that gave me the trick. Well, I got 
the compiler working with my "Hello World" using the -b option and your 
mentioned target-triplet (-v lists the target-options built in the toolset):

'g++  -b x86_64-w64-mingw32 -m64' did the job (without modifying the 
installation, though).

However, this list isn't for building Qt, someone might know how to pass 
the compiler-flags to the configure.exe shipped with Qt Source (I mean 
the qmake step, not the specs file)?

thanks again, .. frank


Date: Sat, 02 Jun 2012 18:37:31 +0100
From: Mark Dootson<[email protected]>
Subject: Re: [Mingw-w64-public] includepaths / processes fail with
        mingw-w64-bin_i686-mingw_20110510_sezero
To:[email protected]
Message-ID:<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi,

It is because you are cross compiling but not passing any target triplet.

There's an 'approach' I have always used which is just create copies of
the 27 executables prefixed x86_64-w64-mingw32 in bin.
(so you have both x86_64-w64-mingw32-g++.exe and g++.exe).

Then ensure the only mingw related thing on your path is ..\mingw64\bin
for the cross compiler. All should work OK I think.

Regards

Mark




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