Commits on Oct 23, 2023

1. [C++20] [Modules] [Driver] Don't enable -fdelayed-template-parsing by… …

   … default on windows after c++20
   
   There are already 3 issues about the broken state of
   -fdelayed-template-parsing and C++20 modules:
   - llvm#61068
   - llvm#64810
   - llvm#65027
   
   The problem is more complex than I thought. I am not sure how to fix it
   properly now. Given the complexities and -fdelayed-template-parsing is
   actually an extension to support old MS codes, I think it may make sense
   to not enable the -fdelayed-template-parsing option by default with
   C++20 modules to give more user friendly experience. Users who still want
   -fdelayed-template-parsing can specify it explicitly.
   
   Given the discussion in llvm#69551,
   we decide to not enable -fdelayed-template-parsing by default on windows
   after c++20

   

   ChuanqiXu9 committed Oct 23, 2023
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