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: ahata...@gmail.com
Reporter: jykni...@google.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@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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