[Bug 251112] Compiling C++ with asan fails by default because libclang_rt.asan-x86_64.so uses symbol pthread_attr_get_np but doesn't link to libpthread.so

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251112

--- Comment #4 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Andrew Stitcher from comment #3)
It really depends on what this symbol is used for.

Linking asan lib with libpthread would change the mode of operation of all
binaries linked with it.  Presence of libpthread modifies libc, libc++, and
perhaps unlisted number of other non-system libs: they start using proper
pthread locks like mutexes.

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