CMake : branch on clang version

Question

How does one achieve the equivalent of the cmake branch below for clang++?

if (GXX_VERSION VERSION_GREATER 4.5 OR GXX_VERSION VERSION_EQUAL 4.5)
    ...

Thanks,

Answer 1

For some reason piokuc's solution doesn't work for me, so I did the following:

EXECUTE_PROCESS( COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE clang_full_version_string )
string (REGEX REPLACE ".*clang version ([0-9]+\\.[0-9]+).*" "\\1" CLANG_VERSION_STRING ${clang_full_version_string})
if (CLANG_VERSION_STRING VERSION_GREATER 3.1)
     ....

Answer 2

CMake defines following for clang:

• CLANG_VERSION_MAJOR,
• CLANG_VERSION_MINOR,
• CLANG_VERSION_PATCHLEVEL,
• and the combination of the above: CLANG_VERSION_STRING

Answer 3

This works for me:

if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.2)
    ...
    ...
endif ()

Similarly, we have VERSION_LESS and VERSION_EQUAL.