Fix/workaround GCC bug about -Wno-implicit-fallthrough
For some reason GCC-6 successfully compiles test program with -Wno-implicit-fallthrough passed via command line. It just silently ignores the unknown arguments which are starting with -Wno-. The issue is, if some other waning happens in the code, then GCC will complain about unknown -Wno- argument which is not supported by current GCC version. This makes some misleading warning prints about unknown command line argument when any other warning happens in code from extern/.
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@ -1389,7 +1389,10 @@ if(CMAKE_COMPILER_IS_GNUCC)
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# flags to undo strict flags
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ADD_CHECK_C_COMPILER_FLAG(CC_REMOVE_STRICT_FLAGS C_WARN_NO_DEPRECATED_DECLARATIONS -Wno-deprecated-declarations)
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ADD_CHECK_C_COMPILER_FLAG(CC_REMOVE_STRICT_FLAGS C_WARN_NO_UNUSED_PARAMETER -Wno-unused-parameter)
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ADD_CHECK_C_COMPILER_FLAG(CC_REMOVE_STRICT_FLAGS C_WARN_NO_IMPLICIT_FALLTHROUGH -Wno-implicit-fallthrough)
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if(CMAKE_COMPILER_IS_GNUCC AND (NOT "${CMAKE_C_COMPILER_VERSION}" VERSION_LESS "7.0"))
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ADD_CHECK_C_COMPILER_FLAG(CC_REMOVE_STRICT_FLAGS C_WARN_NO_IMPLICIT_FALLTHROUGH -Wno-implicit-fallthrough)
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endif()
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if(NOT APPLE)
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ADD_CHECK_C_COMPILER_FLAG(CC_REMOVE_STRICT_FLAGS C_WARN_NO_ERROR_UNUSED_BUT_SET_VARIABLE -Wno-error=unused-but-set-variable)
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