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Add support for special LCG versions

Marco Clemencic requested to merge clemenci/Gaudi:add-support-for-py3-binary-tag into master
  • we can use the virtual BINARY_TAG x86_64-centos7-gcc9+py3-opt to implicitly pick up LCG_XYpython3 instead of the declared LCG_XY
  • the CMake variable LCG_LAYER can be used to use the LCG release LCG_XY_${LCG_LAYER} instead of the plain LCG_XY
  • the option LCG_USE_GENERATORS can be used to fill the CMAKE_PREFIX_PATH with the packages in LCG_generators_<platform>.txt in addition to those in LCG_externals_<platform>.txt

Note that these changes are only relevant to LHCb, as ATLAS does not use the CMake toolchain to configure the build.

Edited by Marco Clemencic

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