https://bugs.llvm.org/show_bug.cgi?id=38237
Bug ID: 38237
Summary: Default argument checking not performed after overload
resolution with C linkage
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: zhong...@pku.org.cn
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
he following code is ill-formed according to the standard, but accepted by
clang++:
namespace A {
extern "C" void f(int = 5);
}
namespace B {
extern "C" void f(int = 4);
}
using A::f;
using B::f;
int main() {
f(3); //OK
f(); //ERROR
}
When a default argument is used as in the second call, it needs to be looked up
to make sure it isn't declared twice. If it is, then it's an error. clang++
will also accept the code whether the default arguments to f() are given the
same or different values.
Instead, g++ rejects the code:
code0.cpp:12:4: error: default argument mismatch in overload resolution
[-fpermissive]
f(); //ERROR
^
code0.cpp:2:18: note: candidate 1: 'void A::f(int = 5)'
extern "C" void f(int = 5);
^
code0.cpp:5:18: note: candidate 2: 'void B::f(int = 4)'
extern "C" void f(int = 4);
^
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