On Feb 6, 2013, at 1:46 PM, Peter Danecek <peter.dane...@bo.ingv.it> wrote:

> Thanks that is what I was looking for. At least there is the list of env. 
> variables which are available and intuition helps. Maybe, more explicit info 
> on which (and how) these variables are actually modified by setting 
> configure.compiler might be helpful.

If you don't mind getting your hands a little dirty, this is the code that 
actually determines which compiler-related variables are set.

http://trac.macports.org/browser/branches/release_2_1/base/src/port1.0/portconfigure.tcl#L488

vq
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