I’ve done the same thing for a ‘project’ ‘written’ in assembly language. Again, it just kinda works, with the caveat that the output messages are less then perfect:
$ CMAKE_TOOLCHAIN_FILE=../xmos_cmake_toolchain/xmos_toolchain.cmake cmake -B build && cmake --build build
-- The ASM compiler identification is unknown
-- Found assembler: /usr/local/bin/XMOS/XTC/15.1.0/bin/xcc
System is unknown to cmake, create:
Platform/XMOS to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Warning: Did not find file Compiler/-ASM
-- Configuring done
-- Generating done
-- Build files have been written to: /home/davea/sandboxes/xmos_cmake_asm_example/build
Scanning dependencies of target example
[ 33%] Building ASM object CMakeFiles/example.dir/src/main.S.obj
[ 66%] Building ASM object CMakeFiles/example.dir/src/func.s.obj
[100%] Linking ASM executable example
[100%] Built target example
$
Code at
git@gitlab.kitware.com:DaveAtkinsonXMOS/xmos_cmake_xc_example.git