Cross-compilation support about cmake-scripts

[StableCoder]

Check out 4af5b40.

I've added an option to target_code_coverage named PRE_ARGS. Much like the original ARGS, this will add the provided arguments to the start of the call, so the whole call becomes:

$PRE_ARGS ccov-* $ARGS

So you should be able to do something like

target_code_coverage(
    ...
    PRE_ARGS /usr/bin/qemu-aarch64-static -L /usr/aarch64-linux-gnu -E LD_LIBRARY_PATH=/some/path
)

Let me know if that works well enough.

[Blumentopf99]

Thanks a lot for your quick support! Meanwhile, I discovered a simpler solution. CMake has a feature for exactly that problem using the variable CMAKE_CROSSCOMPILING_EMULATOR when CMAKE_CROSSCOMPILING is turned ON. We set CMAKE_CROSSCOMPILING_EMULATOR already and everything works fine when I patch code-coverage.cmake to use CMAKE_CROSSCOMPILING_EMULATOR:

add_custom_target(
  ccov-capture-${target_code_coverage_COVERAGE_TARGET_NAME}
  COMMAND ${CMAKE_COMMAND} -E rm -f ${COVERAGE_INFO}
  COMMAND ${LCOV_PATH} --directory ${CMAKE_BINARY_DIR} --zerocounters
  COMMAND ${CMAKE_CROSSCOMPILING_EMULATOR} $<TARGET_FILE:${TARGET_NAME}> ${target_code_coverage_ARGS}
  COMMAND
    ${LCOV_PATH} --directory ${CMAKE_BINARY_DIR} --base-directory
    ${CMAKE_SOURCE_DIR} --capture ${EXTERNAL_OPTION} --output-file
    ${COVERAGE_INFO}
  COMMAND ${EXCLUDE_COMMAND}
  DEPENDS ${TARGET_NAME})

If somebody doesn't use cross-compilation then CMAKE_CROSSCOMPILING is turned OFF. That should be considered somehow.

[StableCoder]

Nice.

I've added ${CMAKE_CROSSCOMPILING_EMULATOR} to e4e0c48, so it's now

COMMAND ${CMAKE_CROSSCOMPILING_EMULATOR}
                      ${target_code_coverage_PRE_ARGS} 
                      $<TARGET_FILE:${TARGET_NAME}> 
                      ${target_code_coverage_ARGS}

Luckily, if no cross-compiling is specified, the CMAKE_CROSSCOMPILING_EMULATOR is just empty.

[Blumentopf99]

Thanks, that works like a charm!

COMMAND ${target_code_coverage_PRE_ARGS} 
                      ${CMAKE_CROSSCOMPILING_EMULATOR}
                      $<TARGET_FILE:${TARGET_NAME}> 
                      ${target_code_coverage_ARGS}