[llvm-bugs] [Bug 37513] New: `__has_feature(is_aggregate)` returns `false` even though `__is_aggregate` exists.

via llvm-bugs llvm-bugs at lists.llvm.org
Thu May 17 23:50:42 PDT 2018


https://bugs.llvm.org/show_bug.cgi?id=37513

            Bug ID: 37513
           Summary: `__has_feature(is_aggregate)` returns `false` even
                    though `__is_aggregate` exists.
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mcypark at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The following program prints 1, indicating that `__has_feature(is_aggregate)`
returned `false`, even though `__is_aggregate` is defined.

```
#include <iostream>

#if __has_feature(is_aggregate)
#error feature
#endif
#if __has_extension(is_aggregate)
#error extension
#endif

struct Agg {};

int main() {
  std::cout << __is_aggregate(Agg);
}
```

https://wandbox.org/permlink/mvOCKdmZGaxKoRAu

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