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

Whisperity via cfe-dev cfe-dev at lists.llvm.org
Mon Feb 17 06:13:15 PST 2020

Unless you need the actual Debug build for anything, maybe try sticking to
assertions and a release build? (-DLLVM_ENABLE_ASSERTIONS=ON
-DCMAKE_BUILD_TYPE=Release) Release build is fast, small, and with enough
assertions (and maybe putting "llvm/Support/Debug.h" into the file and
calling the frontend with -debug?) you could get most of the stuff you need
for debugging.

Jan Ryšavý via cfe-dev <cfe-dev at lists.llvm.org> ezt írta (időpont: 2020.
febr. 17., H, 10:19):

> 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
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> cfe-dev at lists.llvm.org
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