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function(compare_compiler_version lang)
cmake_policy(GET CMP0129 LCC_FALLBACK_MODE)
if(${CMAKE_${lang}_COMPILER} STREQUAL "LCC" OR ${CMAKE_${lang}_COMPILER} STREQUAL "GNU")
execute_process(COMMAND ${CMAKE_${lang}_COMPILER} --version OUTPUT_VARIABLE output)
if("${output}" MATCHES [[lcc:([0-9]+.[0-9]+.([0-9]+)):]])
set(native_version ${CMAKE_MATCH_1})
else()
message(FATAL_ERROR "Can not identify native LCC version for language ${lang}.")
endif()
if("${output}" MATCHES [[\(GCC\) ([0-9]+.[0-9]+.([0-9]+)) compatible]])
set(simulated_version ${CMAKE_MATCH_1})
else()
message(FATAL_ERROR "Can not identify simulated GNU version for language ${lang}.")
endif()
message(STATUS "Compiler native version is ${native_version}, simulated version is ${simulated_version}.")
if("${LCC_FALLBACK_MODE}" STREQUAL "NEW")
if(NOT "${CMAKE_${lang}_COMPILER_ID}" STREQUAL "LCC")
message(FATAL_ERROR "Policy is in NEW mode, but compiler identification is ${CMAKE_${lang}_COMPILER_ID} instead of LCC.")
endif()
if(NOT "${CMAKE_${lang}_COMPILER_VERSION}" STREQUAL "${native_version}")
message(FATAL_ERROR "Policy is in NEW mode, but compiler version is ${CMAKE_${lang}_COMPILER_VERSION} instead of ${native_version}.")
endif()
if(NOT "${CMAKE_${lang}_SIMULATE_ID}" STREQUAL "GNU")
message(FATAL_ERROR "Policy is in NEW mode, but simulated compiler identification is ${CMAKE_${lang}_SIMULATE_ID} instead of GNU.")
endif()
if(NOT "${CMAKE_${lang}_SIMULATE_VERSION}" STREQUAL "${simulated_version}")
message(FATAL_ERROR "Policy is in NEW mode, but simulated compiler version is ${CMAKE_${lang}_SIMULATE_VERSION} instead of ${simulated_version}.")
endif()
else()
if(NOT "${CMAKE_${lang}_COMPILER_ID}" STREQUAL "GNU")
message(FATAL_ERROR "Policy is in OLD mode, but compiler identification is ${CMAKE_${lang}_COMPILER_ID} instead of GNU.")
endif()
if(NOT "${CMAKE_${lang}_COMPILER_VERSION}" STREQUAL "${simulated_version}")
message(FATAL_ERROR "Policy is in OLD mode, but compiler version is ${CMAKE_${lang}_COMPILER_VERSION} instead of ${simulated_version}.")
endif()
if(${CMAKE_${lang}_SIMULATE_VERSION} OR ${CMAKE_${lang}_SIMULATE_ID)
message(FATAL_ERROR "Policy is in OLD mode, but simulated compiler ID/version is ${CMAKE_${lang}_COMPILER_ID}/${CMAKE_${lang}_COMPILER_VERSION} instead of undefined.")
endif()
endif()
endif()
endfunction()
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