[LLVMdev] extern "C" and namespaces

[Riyaz Puthiyapurayil]

Can someone confirm whether the following is a known clang bug? I am having a lot of trouble compiling some old legacy code due to this error. I know "using namespace" is horrible but that doesn't make it illegal (g++ accepts this). The fix is easy but there are just too many instances of this in the legacy code. The following is not from the code I am trying to compile but is derived from an example in the C++11 standard (7.3.4 note 6)

foo.cpp:
namespace A {
    extern "C" int g();
    extern "C++" int h();
}
namespace B {
    extern "C" int g();
    extern "C++" int h(int);
}
using namespace A;
using namespace B;
void f() {
    g(); // okay: name g refers to the same entity
    h(); // okay: overload resolution selects A::h
}

foo.cpp:12:5: error: call to 'g' is ambiguous
    g(); // okay: name g refers to the same entity
    ^
foo.cpp:2:20: note: candidate function
    extern "C" int g();
                   ^
foo.cpp:6:20: note: candidate function
    extern "C" int g();
                   ^
1 error generated.
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