Improve diagnostics for missing Obj-C properties

[llvmbot]

Bugzilla Link	3234
Resolution	FIXED
Resolved on	Mar 12, 2010 00:57
Version	unspecified
OS	All
Reporter	LLVM Bugzilla Contributor
CC	@tkremenek

Extended Description

This:

void f(NSObject *o)
{
o.foo;
}

results in the following error when compiled with gcc:

iMac:clang andersca$ gcc -fsyntax-only t.m
t.m: In function 'f':
t.m:5: error: request for member 'sliff' in something not a structure or union

And when compiled with clang:

iMac:clang andersca$ clang -fsyntax-only t.m
t.m:5:5: error: member reference base type 'NSObject *' is not a structure or union
o.sliff;
~ ^

It would be nice to give a better diagnostic about missing properties if we notice that the object in question is an Objective-C object.

[llvmbot]

http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20081215/010356.html