[llvm-commits] [PATCH] Fix bug with _MSC_VER define

[Chris Lattner]

On Aug 14, 2012, at 4:19 PM, John Garvin <jgarvin at apple.com> wrote:

> Support/Compiler.h was asking about the value of _MSC_VER without making sure it was defined first. Please review.

The patch isn't necessarily wrong, but why is it needed?  Use of undefined macros is specified to yield 0 by the C preprocessor.  I don't understand what this patch changes or fixes.

-Chris