[llvm-dev] Tablegen ridiculously slow when compiling for Debug

Joan Lluch via llvm-dev llvm-dev at lists.llvm.org
Sat Jun 29 10:26:56 PDT 2019

Hi all,

On LLVM version 7.0.1, incremental builds are very fast for both Release and Debug. I’m compiling with Xcode

I recently downloaded LLVM 9.0 from the LLVM-mirror Github repository and found that Incremental "Debug” builds take a ridiculously long time due to Tablegen taking ages (literally more than 10 minutes) to generate files. This makes it totally unusable for debug purposes. However, incremental ‘Release’ builds only take a few seconds.

Why is that?. Any suggestions?.


John Lluch

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