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Date: Sat, 18 Oct 2014 12:18:13 +0200
From: Szabolcs Nagy <>
Subject: Re: Re: gthread_once

* Michael <> [2014-10-18 13:16:52 +1100]:

> Essentially my plan is to compile my console only app for android but using
> the musl library instead of bionic. Im compling for standard x86_64 linux
> first to see if its viable. My app is plain c++ using wxwidgets (base only)
> and boost threads/system. I compiled these dependencies using CC/CXX/AR etc
> vars set to x86_64-linux-musl-gcc etc... and they compile fine and appear
> to be only linking to musl libraries as i used -v on the compliation and
> watched the directories it pulls in.
> Could the pthread_once be something to do with this thread

that's a different glibc specific problem: they have separate
libpthread which makes a lot of things hard so they do various

in your case it seems libstdc++ uses the gthr-posix.h from libgcc
that provides the __gthread_once function which is supposed to call
pthread_once through a weak reference, but the weak ref is 0
(so uninitialized, eventhough musl have the pthread_once symbol)

i'd check

 nm libstdc++.a |grep pthread_once

you should see undefined weak symbols (w) i think

and then at link time these should resolve to the pthread_once
in libc.a

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