VS: EXTRA_COMPILERs incorrectly generated if output name is generated by function

TEMPLATE = app
FUNNY_COMPILER_FILES = foo.txt

defineReplace(funnyCompilerOutputName) {
    name = $$absolute_path($$1, $$OUT_PWD)
    name = $$relative_path($$name, $$_PRO_FILE_PWD_)
    name = $$replace(name, \\.txt$, _txt)
    name = $${name}$${first(QMAKE_EXT_CPP)}
    name = $$replace(name,/,_)
    return($${name})
}

funnycompiler.input = FUNNY_COMPILER_FILES
funnycompiler.output = ${QMAKE_FUNC_FILE_IN_funnyCompilerOutputName}
funnycompiler.commands = copy ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
funnycompiler.variable_out = GENERATED_SOURCES
funnycompiler.dependency_type = TYPE_C
QMAKE_EXTRA_COMPILERS += funnycompiler

"${QMAKE_FUNC_FILE_IN_funnyCompilerOutputName}"