[libcxx-commits] [libcxx] [libcxxabi] [lldb] [libc++] Stop copying headers to the build directory (PR #115380)

[Louis Dionne via libcxx-commits]

ldionne 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.

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