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rpavlik / cmake-modules

My collection of CMake modules
http://academic.cleardefinition.com
Boost Software License 1.0
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Question on get git revision description #59

Closed kobi-ca closed 4 years ago

kobi-ca commented 4 years ago

Hi,

Is there a way to run git_describe in every build and not just in generation time? thanks, Kobi

rpavlik commented 4 years ago

This one is actually easier - you can do something like the following. add_custom_target is considered "always out of date" so it will always run.

set(DESCRIBEFILE ${CMAKE_CURRENT_BINARY_DIRECTORY}/git-describe-results.txt)
add_custom_target(git-describe-target
    ALL
    "${GIT_EXECUTABLE}" describe --dirty > "${DESCRIBEFILE}"
    BYPRODUCTS "${DESCRIBEFILE}"
    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
    COMMENT "Running git describe"
    VERBATIM)

Then you can freely use ${DESCRIBEFILE} though you'll want to add_dependencies() from wherever you use it, to the git-describe-target. Might need to mark DESCRIBEFILE as generated if you use it as a source file, not sure. (You can modify the command line here however you please - I assumed --dirty because the script should get triggered to re-configure if you only care about commits.)

Let me know if this helps!

kobi-ca commented 4 years ago

thanks!