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Date: Thu, 30 Jun 2016 14:50:14 +0200
From: Julien Ramseier <>
Subject: Re: Issues when building libcxx libcxxabi with MUSL

> Le 22 juin 2016 à 21:41, Rich Felker <> a écrit :
> On Wed, Jun 22, 2016 at 09:38:17PM +0200, Julien Ramseier wrote:
>> Hi Zhao,
>> Not sure how you did build llvm-libcxx, but the only issue I encountered myself is
>> the use of PTHREAD_MUTEX_INITIALIZER in libcxx include/__mutex_base.
>> musl uses volatile types in its pthread_mutex_t struct and C++11 does not allow them
>> with constexpr member initializers. This rule has been relaxed in C++14.
> Note that the code using them is still formally/conceptually buggy.
> POSIX does not permit using these initializers as values. They can
> only be used as initializers for objects with static storage duration.
> A "mutex value" makes no sense; mutexes are objects not values.

Actually the latest POSIX spec allows it.
See <>

A workaround for the C++11 constexpr issue should land soon in libcxx trunk. <>

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