[LLVMbugs] [Bug 12032] New: libc++ r150884 fails to build with clang r150884 due to deleted __nat destructor in type_traits

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12032

             Bug #: 12032
           Summary: libc++ r150884 fails to build with clang r150884 due
                    to deleted __nat destructor in type_traits
           Product: libc++
           Version: unspecified
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Keywords: compile-fail
          Severity: normal
          Priority: P
         Component: All Bugs
        AssignedTo: hhinnant at apple.com
        ReportedBy: abigagli at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


On lion 10.7.3, libc++ @r150884, clang++ just built from source @r150884:
export TRIPLE=-apple-
export CXX=$HOME/LLVM-CURRENT/bin/clang++
export CC=$CXX
cd lib
./buildit
.
.
.
+ for FILE in '../src/*.cpp'
+ /Users/abigagli/LLVM-CURRENT/bin/clang++ -c -g -Os -arch i386 -arch x86_64
-std=c++0x -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion -Wnewline-eof
-Wpadded -Wmissing-prototypes -Wstrict-aliasing=2 -Wstrict-overflow=4
-nostdinc++ -I../include ../src/locale.cpp
In file included from ../src/locale.cpp:10:
In file included from ../include/string:434:
In file included from ../include/algorithm:591:
../include/type_traits:3048:22: error: attempt to use a deleted function
    typedef decltype(swap(_VSTD::declval<_Tp&>(), _VSTD::declval<_Tp&>()))
type;
                     ^
../include/type_traits:3056:48: note: in instantiation of template class
     
'std::__1::__detail::__swappable<std::__1::__sso_allocator<std::__1::locale::facet
*, 28> >' requested here
    : public integral_constant<bool, __detail::__swappable<_Tp>::value>
                                               ^
../include/type_traits:3077:41: note: in instantiation of template class
'std::__1::__is_swappable<std::__1::__sso_allocator<std::__1::locale::facet *,
      28> >' requested here
    : public __is_nothrow_swappable_imp<__is_swappable<_Tp>::value, _Tp>
                                        ^
../include/vector:391:13: note: in instantiation of template class
'std::__1::__is_nothrow_swappable<std::__1::__sso_allocator<std::__1::locale::facet
      *, 28> >' requested here
            __is_nothrow_swappable<allocator_type>::value)
            ^
../include/__config:238:34: note: expanded from macro '_NOEXCEPT_'
#  define _NOEXCEPT_(x) noexcept(x)
                                 ^
../include/vector:484:15: note: in instantiation of template class
'std::__1::__vector_base<std::__1::locale::facet *,
      std::__1::__sso_allocator<std::__1::locale::facet *, 28> >' requested
here
    : private __vector_base<_Tp, _Allocator>
              ^
../src/locale.cpp:87:49: note: in instantiation of template class
'std::__1::vector<std::__1::locale::facet *,
      std::__1::__sso_allocator<std::__1::locale::facet *, 28> >' requested
here
    vector<facet*, __sso_allocator<facet*, N> > facets_;
                                                ^
../include/type_traits:832:5: note: function has been explicitly marked deleted
here
    ~__nat() = delete;
    ^
1 error generated.


Everything builds fine with Xcode 4.3's clang.

The following patch 
Index: ../include/type_traits
===================================================================
--- ../include/type_traits    (revision 150884)
+++ ../include/type_traits    (working copy)
@@ -830,7 +830,7 @@
     __nat() = delete;
     __nat(const __nat&) = delete;
     __nat& operator=(const __nat&) = delete;
-    ~__nat() = delete;
+    //~__nat() = delete;
 #endif
 };
seems to solve the problem, but I don't think that's the right thing to do...

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