[LLVMbugs] [Bug 16850] New: __uuidof should introduce an identifier into the namespace

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16850

            Bug ID: 16850
           Summary: __uuidof should introduce an identifier into the
                    namespace
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

the following should compile but doesn't:
#include <stdio.h>
#include <typeinfo>
struct __declspec(uuid("12345678-1234-1234-1234-123456789abC")) uuid;

int main() {
  &__uuidof(uuid);
  printf("%s\n", typeid(_GUID_12345678_1234_1234_1234_123456789abc).name());
}

if it ran, it would print out:
__s_GUID

"struct __s_GUID" is a builtin type vended by the compiler and holds identical
fields as _GUID.

__uuidof(uuid) introduced a declaration that looks like:
extern "C" const __s_GUID _GUID_12345678_1234_1234_1234_123456789abc;

The expression "__uuidof(uuid)" evaluates to something akin to
"*reinterpret_cast<_GUID *>(&_GUID_12345678_1234_1234_1234_123456789abc)"

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