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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/50598] [4.7 Regression] Undefined symbols: "___emutls_v.*", ... on *-apple-darwin*
Date: Sun, 20 Nov 2011 13:02:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50598

--- Comment #28 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-11-20 12:50:39 UTC ---
(In reply to comment #25)
> confirm solved
> cat once.cpp 
> #include<iostream>
>
> int main() {
>
>   std::once_flag flag;
>   std::call_once(flag,[](){std::cout << "hi" << std::endl;});
>
>   return 0;
> }
> ...
> Undefined symbols for architecture x86_64:
>   "___emutls_v._ZSt15__once_callable", referenced from:
>       _main in ccCeliaX.o
> ld: symbol(s) not found for architecture x86_64
> ...

I am not sure to understand comment #25: is the pr fixed or is it still failing
for the above test on x86_64-apple-darwin11 (it passes on
x86_64-apple-darwin10)?