[boost] [build] Use full compiler-version in library filenames

Subject: [boost] [build] Use full compiler-version in library filenames
From: Deniz Bahadir (deniz.bahadir_at_[hidden])
Date: 2017-06-22 11:20:17

Hi list,

While reading Vinnie's mail (regarding the Boost library filenames which 
should additionally contain the address-model) I remembered another 
problem existing with library filenames.
That is, that Boost libraries built with newer GCC versions (since GCC 
5) never add the compiler-version into the library filenames.

Building with GCC 5 and newer only adds "gcc" into the filename to 
determine the toolset, while building with earlier versions of GCC (e.g. 
GCC 4.9 or GCC 4.8) additionally adds the compiler's version (e.g. 
"gcc49" or "gcc48").

I assume this might be due to the fact that the version-scheme of GCC 
changed since GCC 5 and somehow the logic in Boost.Build no longer works 
because of this.
But in order to install boost-libraries built by different GCC versions 
side-by-side in the same directory the version-number is really required 
in the filename.

Maybe someone can fix this again?

A bug-report on Github which addresses this issue already exists:
https://github.com/boostorg/build/issues/191

Thanks in advance,
Deniz

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