sharkautarch wrote:

@aengelke one issue I’ve noticed w/ this PR: currently, when building llvm w/ 
rtti on and also building Polly, Polly fails to compile
This is because Polly’s CMakeLists.txt adds "-fno-rtti" to the cxx flags, 
apparently so that it’s compatible w/ llvm shared libs built w/o rtti
See this 14 year old commit from 2011: 
https://github.com/llvm/llvm-project/commit/080307119ee5a6114686293dce2aa711f59bf6dc

You should probably somehow just edit your pr to exclude the use of pch stuffs 
for polly

https://github.com/llvm/llvm-project/pull/173868
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