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I build LLVM+Clang regularly and it definitely does not take 70GB.

They're probably building doing a debug build which is incredibly disk intensive in my experience.

llvm+clang v10 on Linux builds 8 GB in bin, 13GB in lib and >5 GB in tools + things here an there. That's ~30 GB. Then you need that much for the install. So hard requirement 2 x 30 GB + some slack. Last time I built it was around version 4 and it did not need that much disk space.

> llvm+clang v10 on Linux builds 8 GB in bin, 13GB in lib and >5 GB in tools + things here an there.

just checked and my build folder with llvm & clang is 3GB. That's a release build (pass -DCMAKE_BUILD_TYPE=Release !!) - you don't need a debug build unless you're hacking on llvm itself

> Then you need that much for the install

you want make install/strip, not make install (but why do you need to install ? you can run clang from the build dir just fine)

Thank you for your tips. It's a pity that this information is not very visible on the quick start page.

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