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Date:      Tue, 15 Jan 2019 14:57:51 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 234976] Clang: undefined reference to __atomic_exchange and __atomic_load
Message-ID:  <bug-234976-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234976

            Bug ID: 234976
           Summary: Clang: undefined reference to __atomic_exchange and
                    __atomic_load
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: vallentin@icir.org

I'm having trouble with compiling the following code snippet:

#include <atomic>
#include <cstdint>

struct sixteen {
  uint64_t x = 1;
  int64_t  y = -1;
};

std::atomic<sixteen> x;

int main() {
  auto v = x.load(std::memory_order_relaxed);
  return std::atomic_is_lock_free(&x);
}

I've attempted to compile this as follows:

c++ -std=c++17 -stdlib=libc++ test.cpp
/tmp/test-3fe722.o: In function `main':
test.cpp:(.text+0x34): undefined reference to `__atomic_load'
test.cpp:(.text+0x86): undefined reference to `__atomic_is_lock_free'
c++: error: linker command failed with exit code 1 (use -v to see invocation)

The same snippet compiles fine with GCC 8 and -latomic.

This issue appears to be related to bug #233725 and bug #220822.

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