GNU attributes on RHS of alias declaration are silently discarded

[Quuxplusone]

Bugzilla Link	PR17666
Status	REOPENED
Importance	P normal
Reported by	Stephan Tolksdorf (st@quanttec.com)
Reported on	2013-10-23 14:58:24 -0700
Last modified on	2013-10-24 15:27:18 -0700
Version	trunk
Hardware	All All
CC	llvm-bugs@lists.llvm.org, rafael@espindo.la, richard-llvm@metafoo.co.uk
Fixed by commit(s)
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The current trunk version of clang in C++11 mode reports an error for the
second static assert in the following sample (but not for the equivalent first
one) and crashes for the T3 typedef.

int main() {
  typedef int __attribute__((__aligned__(1))) T1; // no error
  static_assert(alignof(T1) == 1, "wrong alignment");

  constexpr int A = 1;

  using T2 = int __attribute__((__aligned__(A)));
  static_assert(alignof(T2) == 1, "wrong alignment"); // error

  typedef int __attribute__((__aligned__(A))) T3; // crash
  static_assert(alignof(T3) == 1, "wrong alignment");
}

[Quuxplusone]

Crash fixed in r193295.

[Quuxplusone]

closing per comment 1.

[Quuxplusone]

We still issue a bogus error for the second example.