http://llvm.org/bugs/show_bug.cgi?id=22113
Bug ID: 22113
Summary: Cryptic error: "exception specification is not
available until end of class definition"
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
With clang trunk I'm getting an error here:
$ cat except-spec.cpp
////
class Thread
{
public:
virtual ~Thread();
};
class NetworkProfilerThread : public Thread
{
public:
//virtual ~NetworkProfilerThread(); // makes it work
//~NetworkProfilerThread(); // makes it work
struct OutputFileName
{
virtual ~OutputFileName() throw() { };
} m_OutputConfig;
};
////
except-spec.cpp:17:7: error: exception specification is not available until end
of class definition
} m_OutputConfig;
^
1 error generated.
Uncommenting one of the "makes it work" lines and thus declaring the destructor
gets rid of the error. I don't know enough about the standard to say whether
this is expected, but at least the error is quite cryptic and cost me some
experimenting to find out the problem.
As commented by Sean Silva:
Looks like there is a FIXME about this
(test/SemaCXX/implicit-exception-spec.cpp):
namespace ExceptionSpecification {
// FIXME: This diagnostic is quite useless; we should indicate whose
// exception specification we were looking for and why.
struct Nested {
struct T {
T() noexcept(!noexcept(Nested()));
} t; // expected-error{{exception specification is not available until end
of class definition}}
};
}
The offending code is in Sema::ResolveExceptionSpec in
lib/Sema/SemaExceptionSpec.cpp
-- Sean Silva
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