[libcxx-commits] [libcxx] Restrategize compiler installation in libc++ builders. (PR #95706)

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EricWF wrote:

One issue I've discovered is the new image size. The old image was about 8GB, the new one is 12GB -- with heavy pruning.

The cause is size of clang binaries. The compiler explorer ones are all statically linked, while the ones in apt are dynamically linked, resulting in each LLVM binary being 100-200MB, as opposed to ~150KB for the dynamically liked version. 

https://github.com/llvm/llvm-project/pull/95706