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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/65734] New: Yet another case of lost alignment by stor_layout
Date: Fri, 10 Apr 2015 18:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65734

            Bug ID: 65734
           Summary: Yet another case of lost alignment by stor_layout
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org

template <typename T>
struct BVector
{
  typedef T T2;
    typedef T value_type [[gnu::aligned(8)]];    // { dg-bogus "attribute"
"attribute" }
    typedef T2 value_type2 [[gnu::aligned(8)]];  // { dg-bogus "attribute"
"attribute" }
  value_type v;
};
BVector<int> m;

template <template <class> class T>
struct BV2
{
    typedef T<float> value_type [[gnu::aligned(16)]]; // { dg-bogus "attribute"
"attribute" }
  value_type v;
};
BV2<BVector> m2;
int
main()
{
  if (__alignof__ (BV2<BVector>::value_type) != 16)
    __builtin_abort ();
}


$ /aux/hubicka/trunk-install/bin/gcc  -O2 a.C -std=gnu++11
$ ./a.out
Aborted
$ /aux/hubicka/llvm2-install/bin/clang  -O2 a.C -std=gnu++11
$ ./a.out
$ 


I think we have problem with re-layouting the type here.