On 2018-03-03, at 1:14 PM, Jan Stary wrote:
> 
> What of I have two of those, with different Xcode on each?

That is undesirable for reproducible builds. 

Most users have the default Xcode version for a give system, as Apple flushes 
all the updates that way.

If users report broken builds and we recognize non-standard configurations, we 
encourage them to use the default version of Xcode for their system, and 
generally report that the default toolchain installation is the only supported 
configuration. 

Otherwise, chaos. 

> 
> Can you please indly point me to the place in MP base
> where the value of configure.cc get decided?
> 

/opt/local/libexec/macports/lib/port1.0/portconfigure.tcl



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