https://llvm.org/bugs/show_bug.cgi?id=25350
Bug ID: 25350
Summary: Warn about overload resolution with forward-declared
types?
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: h...@chromium.org
CC: llvm-bugs@lists.llvm.org, nicolaswe...@gmx.de
Classification: Unclassified
Consider the following:
s.h:
struct S {};
struct T : S {};
a.cc:
#if X
// Forward declarations, for speed:
struct S;
struct T;
#else
// Just include it, for clarity:
#include "s.h"
#endif
void f(void*);
void f(S*);
void surprise(T *t) { f(t); } // Which f gets called?
Depending on the value of X, i.e. whether we're including s.h or forward
declaring S and T, the call in surprise() will be bound to a different
function.
Could we warn that overload resolution for the call to f is based on an
incomplete type?
(Inspired by an example from:
http://google.github.io/styleguide/cppguide.html#Forward_Declarations)
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