http://llvm.org/bugs/show_bug.cgi?id=8529
Summary: Suboptimal diagnostic produced when ADL would find a
constructor
Product: clang
Version: 2.8
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Older versions of g++ erroneously allow argument-dependent lookup to find
constructors. If code which relies on this is run through clang, the error
message does not make it obvious why the code is rejected. For instance:
namespace N {
enum E { e };
struct C {
C(E = e) {}
};
}
int main() {
(void)C(N::e);
}
Modern version of g++ (4.2 and later) produce this error:
adl.cpp: In function ‘int main()’:
adl.cpp:3: error: argument dependent lookup finds ‘struct N::C’
adl.cpp:9: error: in call to ‘C’
clang produces this error:
adl.cpp:9:9: error: use of undeclared identifier 'C'
(void)C(N::e);
^
1 error generated.
It'd be nice if clang could go the extra mile and say something like:
adl.cpp:9:9: error: constructors cannot be called via argument-dependent lookup
(void)C(N::e);
^
N::
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