[llvm-bugs] [Bug 45260] New: -Wshadow doesn't warn when shadowing symbol from anonymous or outer namespace

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45260

            Bug ID: 45260
           Summary: -Wshadow doesn't warn when shadowing symbol from
                    anonymous or outer namespace
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hans at chromium.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

For example:

$ cat /tmp/a.cc
namespace {
constexpr int foo = 42;
}

namespace ns {
int f() {
  constexpr int foo = 42;
  return foo;
}
}
$ bin/clang -c -Wshadow /tmp/a.cc
(no warning)

There's also no warning if the first 'foo' is at file-scope (i.e. without any
namespace). However, if the first 'foo' is put in 'namespace ns', then it does
warn.

Is there a reason it doesn't warn in the first two cases? It still seems like a
case of shadowing to me.

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