http://llvm.org/bugs/show_bug.cgi?id=14081
Bug #: 14081
Summary: [microsoft] sema for __noop is fairly wrong
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Eli pointed out in an email that
template<typename T> static void f() { T x = 10; }
void g() { __noop(f<void>()); }
is an interesting case for __noop that compiles with cl but not with clang.
__noop has a few other interesting cases too:
* `int __noop = 4` is a syntax error in cl; __noop is a keyword
* `int a = __noop(42, 56);` assigns 0 to a, but so does `int a = __noop;`. All
of the following are valid, all but the first assign 0 to a:
__noop;
a = __noop;
a = __noop();
a = (__noop)();
a = (__noop);
a = (__noop());
a = ((__noop)());
a = ((__noop))();
* __noop is converted to pointers like a 0 literal:
int (*f2)() = __noop; // works, but just assings 0 to f2
* ...but it's not a constant expression:
int arr[__noop() + 1]; // errors out
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