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From: "Jeffrey R. Carter" <spam.jrcarter.not@nospam.acm.org>
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Subject: Re: MinGW Ada compiler licence question targeting commercial
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Hibou57 (Yannick Duch�ne) wrote:
> http://www.mingw.org/wiki/FAQ says
> 
>> Binaries created from the use of MSYS and of MinGW are
>> not bound by any license found within this package unless
>> you use a library that is itself covered by the GPL license.
>> If you wish to create proprietary software then don't use
>> libiberty.a or any other GPL licensed library. A library
>> licensed with LGPL (Lesser GPL) may be used by proprietary
>> software without GPL infection as special permission
>> within the LGPL has given you this right.

That answers your main question: you can create proprietary programs using the 
MinGW compiler. The rest of the paragraph is legal CYA so they can't be sued if 
you use a (non-MinGW) pure GPL library and try to claim that your program is not 
GPL.

-- 
Jeff Carter
"Crucifixion's a doddle."
Monty Python's Life of Brian
82