[llvm-bugs] [Bug 46605] New: -Wcast-align incorrectly warning on aligned type.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46605

            Bug ID: 46605
           Summary: -Wcast-align incorrectly warning on aligned type.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: ahatanak at gmail.com
          Reporter: jyknight at google.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

This seems to be a regression from 854f5f332af4640d9425e9a94442629e4f5a3f98
("[Sema] Teach -Wcast-align to compute an accurate alignment using the
alignment information on VarDecls in more cases.")


Running `clang -Wcast-align test.cc` on the following program:

```
class Foo {
  long x;
};

struct Bar {
  alignas(Foo) char buf[sizeof(Foo)];
  Foo* getFoo() { return (Foo*)&buf; }
};
```

results in an incorrect warning, despite that "buf" is actually correctly
8-byte aligned:

test.cc:7:26: warning: cast from 'char (*)[8]' to 'Foo *' increases required
alignment from 1 to 8 [-Wcast-align]
  Foo* getFoo() { return (Foo*)&buf; }
                         ^~~~~~~~~~

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