XCConfig not refreshing until Xcode is restarted

I want to have a single target and several compilation schemes, and have some compiler definitions declared by a pre-action script of the schemes.

The pre-action script is generating a comp.xcconfig file which is #included by [Release|Debug]Config.xcconfig.

My generated comp.xcconfig holds this line:

GCC_PREPROCESSOR_DEFINITIONS = $(inherited) MY_TEST

My app include these lines:

#ifdef MY_TEST
    #error ye
#else
    #error oy
#endif

Compiling with the above configuration is resulting with error 'ye', as expected.

If I then change comp.xcconfig to be:
GCC_PREPROCESSOR_DEFINITIONS = $(inherited) MY_TEST1234
I'm still getting 'ye'. But if I quit Xcode and restart it, I'm getting the expected 'oy'.

My Question:

Is there a way to force Xcode to track xcconfig files for changes without the need to exit Xcode?

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