[CMake] CMake extracting tar via execute_process does not allow extraction in subdirectories

[Saad Khattak]

Hi,

If I have the following command:

  execute_process(
    COMMAND ${CMAKE_COMMAND} -E tar xzf mySDK.tar.gz
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    )

the extraction works and extracts the tar in the current directory. But
this:

  execute_process(
    COMMAND ${CMAKE_COMMAND} -E tar xzf mySDK.tar.gz
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/someSubdirectory
    )

fails to extract into 'someDirectory' (even if it already exists - although
it 'should' create the directory for me).

Am I misunderstanding some commands?

Thanks,
Saad
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