Slow stacktraces when built with clang

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For a long time now, when I build with gcc my stacktraces generate instantaneously, but when I build with clang they are very slow, sometimes 1-2 seconds per frame. I've observed this with many versions of gcc and many versions of clang over the last few years, so it seems to be a robust issue. Any idea what could cause this? Have you tried using this library with clang? Would really like to find a solution to this.

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Should also mention that I use the lld linker when I build with clang, if that matters.