Distinguish pointer incompatibilities where only sign differs from other incompatibilities

[danchr]

Bugzilla Link	3342
Resolution	FIXED
Resolved on	Mar 12, 2010 00:57
Version	unspecified
OS	All
Attachments	First attempt…
CC	@efriedma-quic,@tkremenek

Extended Description

Lots of legacy code happily compares loads of pointers of incompatible signs. The attached patch is a rough stab at implementing the -Wno-pointer-sign flag that GCC has for suppressing these.

[danchr]

assigned to @tkremenek

[lattner]

Ted, can you please review this patch when convenient? Thanks

[efriedma-quic]

I committed an adjusted version of the Sema bits in r67494. I'll let someone else implement -Wno-pointer-sign.

[efriedma-quic]

Option added to driver in r68062.

[lattner]

Very nice Eli!