[Bug 214902] head -r309179 buildworld on powerpc64 via clang 3.9.0: llvm::sys::CompareAndSwap and llvm::sys::MemoryFence undefined so build stops

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214902

--- Comment #1 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #0)

The stage was:

>>> stage 1.2: bootstrap tools

During:

--- _bootstrap-tools-usr.bin/clang/clang-tblgen ---
and . . .
--- _bootstrap-tools-usr.bin/clang/llvm-tblgen ---


It looks like this llvm activity needs to compile and link in:

llvm/lib/Support/Atomic.cpp

which defines the two routines:

#include "llvm/Support/Atomic.h"
#include "llvm/Config/llvm-config.h"

using namespace llvm;

#if defined(_MSC_VER)
#include <Intrin.h>
#include <windows.h>
#undef MemoryFence
#endif

#if defined(__GNUC__) || (defined(__IBMCPP__) && __IBMCPP__ >= 1210)
#define GNU_ATOMICS
#endif

void sys::MemoryFence() {
#if LLVM_HAS_ATOMICS == 0
  return;
#else
#  if defined(GNU_ATOMICS)
  __sync_synchronize();
#  elif defined(_MSC_VER)
  MemoryBarrier();
#  else
# error No memory fence implementation for your platform!
#  endif
#endif
}

sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
                                  sys::cas_flag new_value,
                                  sys::cas_flag old_value) {
#if LLVM_HAS_ATOMICS == 0
  sys::cas_flag result = *ptr;
  if (result == old_value)
    *ptr = new_value;
  return result;
#elif defined(GNU_ATOMICS)
  return __sync_val_compare_and_swap(ptr, old_value, new_value);
#elif defined(_MSC_VER)
  return InterlockedCompareExchange(ptr, new_value, old_value);
#else
#  error No compare-and-swap implementation for your platform!
#endif
}

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