[LLVMdev] Building with Microsoft Visual Studio

[S3]

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> I am working on a port of LLVM targeting a proprietary VM. Thus far
> development has been under Linux and Cygwin. Cygwin licensing would appear
> to require that LLVM built under Cygwin would have to be released under the
> GPL, so alternatives are being investigated.

I am not a lawyer, but:
I think that you are misinterpreting the GPL.
Just because Cygwin contains some GPL software
does not automatically make all software it
compiles GPL.  Compiling LLVM with Cygwin
does not change Cygwin's license.
So, you are safe here.
(The only way the GPL would apply is if you
were modifying Cygwin itself here, which you are not.
You are just using it to compile something else.)
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