[MacPorts] #67216: libgcc12: ASAN_OPTIONS=detect_leaks=1 causes apparent hang

[MacPorts]

#67216: libgcc12: ASAN_OPTIONS=detect_leaks=1 causes apparent hang
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 Reporter:  msbit     |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  libgcc12  |       Port:  libgcc12
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 When running a binary I've compiled with `-fsanitize-address` with the
 `ASAN_OPTIONS` variable set to `detect_leaks=1`, the process appears to
 never terminate.

 I note that when also adding `leak_check_at_exit=0` this doesn't occur,
 but it also doesn't catch any leaks that exist at exit time. Further,
 calling `__lsan_do_leak_check()` manually (with either
 `leak_check_at_exit=0` or not) causes the hanging behaviour.

 Attached is a reproducible script, and the output.

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Ticket URL: <https://trac.macports.org/ticket/67216>
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