flag for selecting a specific gcc toolchain version

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flag for selecting a specific gcc toolchain version

Roman Popov via cfe-dev
i noticed that there seems to be no way to select a particular gcc toolchain version, am i correct ?
--gcc-toolchain seems not to be very granular as it expects sth like /usr and then automatically picks the latest version.

Currently, as a workaround i'm mimicking /usr  using symlinks excluding all the gcc versions i don't want. 
I've posted the question and answered it on stackoverflow: http://stackoverflow.com/a/41982109/3053638 

Assuming there is no better way, i would love to contribute a patch. 
Can anyone give me a hint where the best place is to integrate this functionality?  

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