clang 的 c++11 支持可靠吗？

我在尝试混合clang（Apple LLVM版本6.0（clang-600.0.56）（基于LLVM 3.5svn，目标：x86_64-apple-darwin14.0.0），c ++ 11和CGAL（通过MacPorts）时遇到了一个有趣的问题。

似乎我是否调用std::vector<>::reserve将决定我的程序是否会编译。

我已经将问题缩减为一个最小的示例（与 CGAL 示例一样小）：

#include <vector>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/AABB_tree.h>
#include <CGAL/AABB_traits.h>
#include <CGAL/AABB_triangle_primitive.h>
// CGAL::Epeck works fine, suggesting the problem is in CGAL::Epick
typedef CGAL::Epick Kernel;
typedef CGAL::Triangle_3<Kernel> Triangle_3; 
typedef typename std::vector<Triangle_3>::iterator Iterator;
typedef CGAL::AABB_triangle_primitive<Kernel, Iterator> Primitive;
typedef CGAL::AABB_traits<Kernel, Primitive> AABB_triangle_traits;
typedef CGAL::AABB_tree<AABB_triangle_traits> Tree;
typedef typename Tree::Point_and_primitive_id Point_and_primitive_id;
typedef CGAL::Point_3<Kernel>    Point_3;
template <typename BKernel>
void A()
{
  const CGAL::AABB_tree<
    CGAL::AABB_traits<BKernel, 
      CGAL::AABB_triangle_primitive<BKernel, 
        typename std::vector<CGAL::Triangle_3<BKernel> >::iterator
      >
    >
  > tree;
  Point_and_primitive_id pp = tree.closest_point_and_primitive(Point_3());
}
void B()
{
  std::vector<Triangle_3> T;
#ifdef MAGIC
  T.reserve(0);
#endif
  return A<Kernel>();
}

发行：

clang++ -std=c++11 -c example.cpp -I/opt/local/include

这将无法编译。给出错误如下：

    In file included from example.cpp:1:
    In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
    In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
    In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:626:
    In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:157:
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__tuple:228:60: error: 
          no member named 'value' in 'std::__1::is_convertible<const CGAL::Point_3<CGAL::Epick> &,
          CGAL::Point_3<CGAL::Epick> >'
                                   is_convertible<_Tp0, _Up0>::value &&
                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__tuple:242:14: note: 
          in instantiation of template class 'std::__1::__tuple_convertible_imp<true, std::__1::__tuple_types<const
          CGAL::Point_3<CGAL::Epick> &, const CGAL::Vector_3<CGAL::Epick> &>,
          std::__1::__tuple_types<CGAL::Point_3<CGAL::Epick>, CGAL::Vector_3<CGAL::Epick> > >' requested here
        : public __tuple_convertible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==

但是，如果我对std::vector::reserve进行这个神奇的调用，这确实可以编译，发出：

clang++ -std=c++11 -c example.cpp -I/opt/local/include -DMAGIC

或通过禁用 C++11

clang++ -c example.cpp -I/opt/local/include

1. 这是 CGAL 中的错误还是叮当声？
2. 对于这种不稳定的编译器行为，有什么解释？
3. 有没有一种干净的方法来避免这种情况（希望不要真正更改模板或函数原型设置，因为我需要适合我更大项目的解决方案）。