if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1) message(ERROR "GCC >= 5.1 required - detected ${CMAKE_CXX_COMPILER_VERSION} not supported") endif () elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang") if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5) message(ERROR "Clang >= 3.5 required - detected ${CMAKE_CXX_COMPILER_VERSION} not supported") endif () elseif(MSVC) if (MSVC_VERSION VERSION_LESS 1900) message(ERROR "Visual Studio >= 2015 (19.0) required - detected ${MSVC_VERSION} not supported") endif () endif()