[llvm-bugs] [Bug 34044] New: undefined reference to '__atomic_is_lock_free' with libstdc++

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34044

            Bug ID: 34044
           Summary: undefined reference to '__atomic_is_lock_free' with
                    libstdc++
           Product: clang
           Version: 5.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: raj.khem at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Compile this sample with clang++ results in error while g++ works fine

#include <atomic>
#include <iostream>

struct Simple1 { int i; };

int main()
{
    std::atomic<Simple1> s1;
    std::cout << std::boolalpha << s1.is_lock_free() << '\n';
    return 0;
}


clang++ test.cpp -std=c++11                                                    
                          (08-03 06:47)
/tmp/tmp.Ro4Nz5NMoq/test-5d79a3.o: In function
`std::atomic<Simple1>::is_lock_free() const':
test.cpp:(.text._ZNKSt6atomicI7Simple1E12is_lock_freeEv[_ZNKSt6atomicI7Simple1E12is_lock_freeEv]+0x1b):
undefined reference to `__atomic_is_lock_free'


if I use -stdlib=libc++ it links successfully, it seems to be only a problem
when
using libstdc++

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20170803/5c8bc39c/attachment.html>