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

[Joan Lluch via llvm-dev]

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?.

Thanks.

John Lluch