[cfe-dev] Speed up debug version of LibTooling AST parsing

[Jan Ryšavý via cfe-dev]

We are using Clang LibTooling for source-to-source conversion. Size of converted headers is around 10MB.

Release version of our conversion utility works fine, but debug version is spending 20 seconds in clang::ParseAST.

Is there any chance how to speed up parsing, for example using precompiled headers (or storing parsed AST)?

Could you please point me in the right direction?

Best regards
Jan Rysavy