vitalybuka wrote:

> IIUC, the build that encountered issues in this patch ([in the comment 
> above](https://github.com/llvm/llvm-project/pull/115380#issuecomment-2590801533))
>  is a flavour of (2), right? That seems surprising to me though since we also 
> use the same flags when configuring libc++: 
> https://github.com/llvm/llvm-project/blob/main/libcxx/CMakeLists.txt#L596
> 
> So the difference would be that you folks are building libc++ instrumented 
> via the bootstrapping build instead of the "runtimes" build that we use for 
> the rest of libc++ CI.
> I also fail to understand why our own bootstrapping build pre-commit CI 
> didn't trip this wire.

it's no.1
The difference Is that 
https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh
 builds build libc++ into IR full LTO, with minimal features as possible to be 
able to build LLVM symbolizer.



https://github.com/llvm/llvm-project/pull/115380
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