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kirika:/root # gcc -dumpversion
7
kirika:/root # g++ -dumpversion
7
kirika:/root # gcc --version
gcc (SUSE Linux) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

kirika:/root # g++ --version
g++ (SUSE Linux) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

   elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
      execute_process(
         COMMAND sh -c "${CMAKE_CXX_COMPILER} -dumpversion"
         OUTPUT_VARIABLE CXX_VERSION
      )
      # Let's actually get a numerical version of GCC's version
      STRING(REGEX REPLACE "([0-9]+)\\.([0-9])\\.([0-9]).*" "\\1\\2\\3" CXX_VERSION ${CXX_VERSION})

      # When compiled with --with-gcc-major-version-only newer gcc versions
      # only report the major number with -dumpversion, and -dumpfullversion
      # (which is not understood by older gcc versions) must be used instead
      # to get the true version !!!  The guy who coded this (instead of
      # simply adding a -dumpmajorversion) should face death penalty for
      # utter (and lethal, natural-selection wise) stupidity !
      if (${CXX_VERSION} LESS 100)
         execute_process(
            COMMAND sh -c "${CMAKE_CXX_COMPILER} -dumpfullversion"
            OUTPUT_VARIABLE CXX_VERSION
         )
         STRING(REGEX REPLACE "([0-9]+)\\.([0-9])\\.([0-9]).*" "\\1\\2\\3" CXX_VERSION ${CXX_VERSION})   
      endif (${CXX_VERSION} LESS 100)
      message(STATUS "GCC version (dots removed): ${CXX_VERSION}")