donat.nagy added a comment. I'm also using `gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0` (which supported according to the LLVM "Getting Started" page <https://llvm.org/docs/GettingStarted.html#getting-the-source-code-and-building-llvm>) and I see the same std::optional compilation errors. Please revert this commit or fix the build.
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