[LLVMbugs] [Bug 22113] New: Cryptic error: "exception specification is not available until end of class definition"

[bugzilla-daemon at llvm.org]

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: unassignedclangbugs at nondot.org
          Reporter: clang at martinien.de
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    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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