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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/59807] mutex misses destructor if non-function call initialization is used
Date: Tue, 14 Jan 2014 17:19:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59807

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It a target's pthread_mutex requires cleanup then it should not define
__GTHREAD_MUTEX_INIT, it should use the init function, and then it gets a
chance to also run a destroy function.

That can be controlled by defining _GTHREAD_USE_MUTEX_INIT_FUNC in the relevant
libstdc++-v3/config/os/xxx/os_defines.h header.