qi_generate_src(): adding dependency to the generator does not work on Visual

[dmerejkowsky]

Seen with the automatic test in qibuild/test/test_qibuild_make.py : test_codegen_fail_when_generating_command_fails

Using

set(_out "${CMAKE_BINARY_DIR}/main.cpp")

qi_generate_src(${_out}
    SRC main.in.cpp
    COMMAND ${_cmd}
    DEPENDS "${_gen_py}"
)

qi_create_bin(test_foo "${_out}")

Does not cause main.cpp to be re-generated when gen_py changes. (At least when using Visual Studio). Using Ninja works.

[dmerejkowsky]

Note: workaround is to add the generator to the sources of the executable:

qi_create_bin(test_foo "${_out}" "${_gen_py}")

[dmerejkowsky]

Fixed in CMake 3.5.2 \o/