[CMake] Improve CPackRPM debug output

[Stewart, Robert]

I suggest adding the following to CPackRPM.cmake at https://github.com/Kitware/CMake/blob/8f05be992172e6d65bbb23426231fa253d7f15c9/Modules/Internal/CPack/CPackRPM.cmake#L1776 to aid understanding of what CPackRPM.cmake is doing:

    if(CPACK_RPM_PACKAGE_DEBUG OR CPACK_RPMBUILD_EXEC_RESULT)
      message("CPackRPM:Debug: running
    \"${RPMBUILD_EXECUTABLE}\" ${RPMBUILD_FLAGS}
        --define \"%_topdir ${CPACK_RPM_DIRECTORY}\"
        --buildroot \"%_topdir/${CPACK_PACKAGE_FILE_NAME}${CPACK_RPM_PACKAGE_COMPONENT_PART_PATH}\"
        --target \"${CPACK_RPM_PACKAGE_ARCHITECTURE}\"
        \"${CPACK_RPM_BINARY_SPECFILE}\"
    in \"${CPACK_TOPLEVEL_DIRECTORY}/${CPACK_PACKAGE_FILE_NAME}${CPACK_RPM_PACKAGE_COMPONENT_PART_PATH}\"")
    endif()

(It wasn't worth my trouble to fork the project and issue a pull request for this.  Should I file a bug?)

___
Rob


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