"b2 --layout=versioned toolset=gcc-5" creates library-names w/o compiler-version

[Bagira80]

Since GCC has switched its version scheme (starting with GCC 5), building the Boost libraries (with b2) with parameters --layout=versioned and toolset=gcc-5 (or newer GCC) does no longer create library-names containing the compiler's version number. At least, this is the case on Linux.

For example, building Boost.Program_Options with --layout=versioned results in:

• GCC 4.8: libboost_program_options-gcc48-mt-1_63_0.so
• GCC 4.9: libboost_program_options-gcc49-mt-1_63_0.so
• GCC 5: libboost_program_options-gcc-mt-1_63_0.so
• GCC 6: libboost_program_options-gcc-mt-1_63_0.so

It would be great if this could be fixed so that the Boost-libraries build with GCC 5 and 6 could be installed side-by-side into the same directory.

[swatanabe]

The reason is that the version regex in common.toolset-tag expects a two digit version.

[swatanabe]

I used -dumpfullversion to bypass the problem.