[LLVMdev] RFC: Atomics.h

Owen Anderson resistor at mac.com
Thu May 28 22:41:19 PDT 2009

On May 28, 2009, at 6:03 PM, Jonathan Ragan-Kelley wrote:

> In the current trunk, System/Atomic.[h,cpp] define void
> llvm::sys::MemoryFence(). This conflicts with the MemoryFence macro in
> <windows.h> and (since it's a preprocessor macro, and not a scoped
> function definition) causes the sys::MemoryFence definition on
> Atomic.cpp:23 to explode, as it's nonsensically expanded to a cl
> intrinsic (_mm_mfence). This breaks the Visual Studio build.
> The trivial fix is to #undef MemoryFence immediately after including
> <windows.h>, since it's clearly assumed not to exist. A deeper and
> safer fix might consider avoiding a name conflict with a core system
> macro on a widely used platform.

Wait, it defines MemoryFence() AND MemoryBarrier()??

Sheesh, they had to take all the reasonable names.  :-/

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