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[Matthias Goldhoorn <matthias@xxxxxxxxxxxx>]

The package needs to be build with gcc5.2 to have the correct (dualabi)
symbols in the library.

Therefore the back port to 15.10 is definitely needed! Otherwise 3th
parity libs cannot link against the clang compiler (what we definitely
need)

In generall all librarys on a dualabi system (>=gcc5.2) should be compilet with a dualabi compiler. 
By enforcing this the system becomes consistend and fully compiletime safe against c++11.
Mixing pre-dual abi's and and compiled user application can cause a invalid binary.

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https://bugs.launchpad.net/bugs/1501300

Title:
  Wily (15.10) this package got not compiled with __cxx11 support

Status in llvm-toolchain-3.4 package in Ubuntu:
  Fix Released

Bug description:
  This packages does not contain any __cxx11 symbols when installed. This causes the problem that user-space applications cannot link successfully to it.
  Recompile the (untouched) dpkg source package on the same machine and installing it solved the problem.

  There seems something in the package generation broken.

  Steps to reproduce try to compile the attached minimal example
  https://github.com/goldhoorn/clang-sandbox

  
  Errors:
  CMakeFiles/main.dir/main.cpp.o: In function `foo()':
  /tmp/clang-sandbox/main.cpp:25: undefined reference to `clang::NamedDecl::getQualifiedNameAsString[abi:cxx11]() const'
  CMakeFiles/main.dir/main.cpp.o: In function `clang::QualType::getAsString[abi:cxx11](clang::SplitQualType)':
  /usr/lib/llvm-3.4/include/clang/AST/Type.h:868: undefined reference to `clang::QualType::getAsString[abi:cxx11](clang::Type const*, clang::Qualifiers)'
  CMakeFiles/main.dir/main.cpp.o: In function `clang::ast_matchers::internal::matcher_matchesName0Matcher::matches(clang::NamedDecl const&, clang::ast_matchers::internal::ASTMatchFinder*, clang::ast_matchers::internal::BoundNodesTreeBuilder*) const':
  /usr/lib/llvm-3.4/include/clang/ASTMatchers/ASTMatchers.h:1439: undefined reference to `clang::NamedDecl::getQualifiedNameAsString[abi:cxx11]() const'
  CMakeFiles/main.dir/main.cpp.o: In function `clang::ast_matchers::internal::matcher_hasName0Matcher::matches(clang::NamedDecl const&, clang::ast_matchers::internal::ASTMatchFinder*, clang::ast_matchers::internal::BoundNodesTreeBuilder*) const':
  /usr/lib/llvm-3.4/include/clang/ASTMatchers/ASTMatchers.h:1411: undefined reference to `clang::NamedDecl::getQualifiedNameAsString[abi:cxx11]() const'
  /usr/lib/llvm-3.4/lib/libclangAST.a(ExprConstant.o): In function `handleIntIntBinOp((anonymous namespace)::EvalInfo&, clang::Expr const*, llvm::APSInt const&, clang::BinaryOperatorKind, llvm::APSInt, llvm::APSInt&)':
  (.text+0x6a35): undefined reference to `llvm::APInt::toString(unsigned int, bool) const'
  /usr/lib/llvm-3.4/lib/libclangAST.a(StmtPrinter.o): In function `(anonymous namespace)::StmtPrinter::VisitIntegerLiteral(clang::IntegerLiteral*) [clone .isra.302]':

  ...

  This example is workign on privious ubuntus and debians

  Sysinfo:
  Description:	Ubuntu Wily Werewolf (development branch)
  Release:	15.10
  In a VirtualBox

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