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As somebody who uses c++ daily and spends a lot of time compiling, I am really excited about modules. Unfortunately, the latest even unreleased g++ v11 and clang v8 only say they support them partially. Does anybody have any experience trying them out? Do they work,l and are they ready for production use?

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i tried to evaluate whether they would help build times at all. this is the only reason i want them. based on some research, they don't if you have parallel builds (since a module must be built before its users/not in parallel). so i think this lessened excitement from users/compiler devs/build tool makers. and it was enough to convince me to just buy more cores to parallelize builds more rather than put in work for half baked modules

There are already precompiled headers. They are a big speedup as far as I know, but semantically problematic. Maybe if you use them, you will not see a speedup.

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