[llvm-bugs] [Bug 26249] New: Poor diagnostic when anonymous enum with underlying type is declared in a struct and the underlying type isn't known

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26249

            Bug ID: 26249
           Summary: Poor diagnostic when anonymous enum with underlying
                    type is declared in a struct and the underlying type
                    isn't known
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

This has a nice diagnostic:

Nicos-MBP:llvm-build thakis$ cat enum.cc
enum : uint32_t { kNone = 0 };
Nicos-MBP:llvm-build thakis$ clang -c enum.cc -std=c++11
enum.cc:1:8: error: unknown type name 'uint32_t'
enum : uint32_t { kNone = 0 };
       ^


This makes it fairly clear that an stdint.h include is missing.  But this
doesn't:

Nicos-MBP:llvm-build thakis$ cat enum.cc
struct bla {
  enum : uint32_t { kNone = 0 };
};
Nicos-MBP:llvm-build thakis$ clang -c enum.cc -std=c++11
enum.cc:2:8: error: unnamed enumeration must be a definition
  enum : uint32_t { kNone = 0 };
       ^
enum.cc:2:3: warning: declaration does not declare anything
[-Wmissing-declarations]
  enum : uint32_t { kNone = 0 };
  ^

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