[llvm-bugs] [Bug 39471] New: ext_vector_type as c++11 attribute with clang:: prefix.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39471

            Bug ID: 39471
           Summary: ext_vector_type as c++11 attribute with clang::
                    prefix.
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: OpenCL
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at marehr.dialup.fu-berlin.de
                CC: anastasia.stulova at arm.com, llvm-bugs at lists.llvm.org

I would expect that the following should work

```c++
template <typename value_type, unsigned length>
struct simd
{
  // using type = value_type __attribute__((ext_vector_type(length))); works
  using type [[clang::ext_vector_type(length)]] = value_type; // does not work
};

using int32x16_t = simd<int, 16>::type;
```

but fails with the following message:

```terminal
warning: unknown attribute 'ext_vector_type' ignored [-Wunknown-attributes]
  using type [[clang::ext_vector_type(length)]] = value_type;
               ^
```

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