[PATCH] clang-cl: Make /Za disable oldnames.lib dependency

[Hans Wennborg]

On Wed, Aug 7, 2013 at 11:44 PM, Charles Davis <cdavis5x at gmail.com> wrote:
>
>   This flag should be doing more stuff. This flag is supposed to request strict ANSI conformance (according to Microsoft's, uh... "unique" interpretation of that). That means at least (in GCC terms) `-fno-ms-extensions`, in addition to not auto-linking `OLDNAMES.LIB`. (The `/Ze` flag undoes the effects of `/Za`.)
>
>   I seem to recall someone from MS on `cfe-dev` (and yes, they do exist!) saying that `/Za` is broken and shouldn't be used (cf. "/Za considered harmful" or some such). Are you sure you want to implement it, given that?

Right. It's not obvious what we should do for /Za. We can't disable
-fms-compatibility for instance, because then we couldn't parse some
template code that cl.exe would accept under /Za, etc.

However, since I just added the oldnames.lib thing in a previous
patch, I think it makes sense to hook up this flag as way of turning
that off.

 - Hans