Tell generators about CMAKE_SYSTEM_NAME as soon as it is known
Add a cmGlobalGenerator::SetSystemName virtual method. Call it from cmGlobalGenerator::EnableLanguage as soon as CMAKE_SYSTEM_NAME is known. This will give generators a chance to adapt themselves to the target system. Pass the cmMakefile instance to the method so that the generator can update it accordingly. Return early from EnableLanguage if SetSystemName returns false.
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