How to specify which compiler to use using this action?

[flynneva]

I'm trying to build with clang using this action here for usb_cam but I dont think its working.

From the ROS 2 docs it looks like we just need to set the CC / CXX env vars to clang and (maybe?) set the --cmake-force-configure flag for colcon build to get it to build with clang...but im not sure if this action is respecting those variables or not.

Any tips/tricks here would be great 🙏🏼

[christophebedard]

I haven't checked if something is preventing the CC/CXX env vars from being passed on to the colcon build call, but I would try using the CMAKE_C_COMPILER/CMAKE_CXX_COMPILER variables instead. You can use the extra-cmake-args action input for that, e.g.:

extra-cmake-args: -DCMAKE_C_COMPILER=whatever -DCMAKE_CXX_COMPILER=whateverxx

I don't believe you need to use --cmake-force-configure. Looks like that would only be used if you were re-building and changing the compiler.

Let me know if that works.

[flynneva]

@christophebedard that worked, thanks!