After I declared a variable in this way:
#include <thread>
namespace thread_space
{
thread_local int s;
} //etc.
i tried to compile my code using 'g++ -std=c++0x -pthread [sourcefile]'. I get the following error:
example.C:6:8: error: thread-local storage is unsupported for the current target
static thread_local int s;
^
1 error generated.
If i try to compile the same code on Linux with GCC 4.8.1 whit the same flags, i get a functioning executable file. I'm using clang-503.0.40 (the one which comes with Xcode 5.1.1) on a MacBook Pro running OSX 10.9.3. Can anybody explain me what i'm doing wrong? Thank you!!
Try clang++ -stdlib=libc++ -std=c++11
. OS X's outdated libstdc++ doesn't support TLS.
Edit
Ok, this works for the normal clang version but not for the Xcode one.
I did a diff against Apple's clang (503.0.38) and the normal released one and found the following difference:
.Case("cxx_thread_local",
- LangOpts.CPlusPlus11 && PP.getTargetInfo().isTLSSupported() &&
- !PP.getTargetInfo().getTriple().isOSDarwin())
+ LangOpts.CPlusPlus11 && PP.getTargetInfo().isTLSSupported())
So I think this is a bug in Apple's clang version (or they kept it in there on purpose - but still weird, because -v
says based on 3.4).