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This is a reproducer for issue #20507, which PR #19496 is attempting to fix in a trivial manner.
The issue is that the
dynamicLibraries
array would be empty at this point whenENVIRONMENT_IS_PTHREAD
, causingloadDylibs()
to be no-op. According to #19496 (comment), the__emscripten_dlsync_self()
function is responsible for loading the same libraries that the main thread loaded, so this change ought to be safe.