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[Brian Murray <brian@xxxxxxxxxx>]

** Also affects: libc++ (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1610168

Title:
  error: 'basic_string<_CharT, _Traits, _Allocator>' is missing
  exception specification

Status in libc++ package in Ubuntu:
  Confirmed
Status in libc++ source package in Xenial:
  New
Status in libc++ package in Debian:
  Fix Released

Bug description:
  This is mirroring Debian bug #808086 https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=808086

  Compiling any source file that includes <string> with clang 3.8 and
  -std=c++11 -stdlib=libc++ results in a compile error.

  While this is a minor bug in Debian (as it doesn't ship 3.8 yet),
  xenial does, and that's a major problem as it makes libc++ useless.

  clang: warning: argument unused during compilation: '-stdlib=libc++'
  In file included from test.cpp:1:
  In file included from /usr/include/c++/v1/iostream:38:
  In file included from /usr/include/c++/v1/ios:216:
  In file included from /usr/include/c++/v1/__locale:15:
  /usr/include/c++/v1/string:1938:44: error: 'basic_string<_CharT, _Traits, _Allocator>' is missing exception specification 'noexcept(is_nothrow_copy_constructible<allocator_type>::value)'
  basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a)
                                             ^
  /usr/include/c++/v1/string:1326:76: note: previous declaration is here
      __attribute__ ((__visibility__("hidden"), __always_inline__)) explicit basic_string(const allocator_type& __a)
                                                                             ^
  1 error generated.

  --

  Update (30 Aug 2017): as per
  https://wiki.ubuntu.com/StableReleaseUpdates :

  [Impact]

  This bug makes it impossible to compile any C++11 source file that
  includes <string> with clang 3.8 using libc++. Any non-trivial C++11
  codebase is affected, making the whole libc++ package useless.

  [Test Case]

  See above. Create a C++ file that simply contains #include <string>
  and compile it with clang++ -std=c++11 -stdlib=libc++ file.cpp.

  [Regression Potential]

  The current <string> header simply does not work with clang-3.8 under
  any condition, so there is no regression potential.

  The regression potential for GCC is also extremely limited: no package
  whatsoever uses GCC in combination with libc++, and the fact that GCC
  5.4 -- currently in Xenial -- does not detect the error that Clang
  detects is just showing that GCC is bugged in this regard.

  [Other Info]

  The patch/workaround fixes the problem. See also the discussion at the
  linked Debian bug report as well as
  https://stackoverflow.com/q/37096062

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