boost thread.hpp does not compile with -std=c++0x (Natty's gcc is not a supported compiler of Natty's boost)

[Trent Apted]

This is a regression from libboost1.40-dev in Lucid (gcc version 4.4.3), where this test works.

The version of gcc that ships with Natty is not a supported compiler of the boost that ships with Natty (see http://www.boost.org/users/history/version_1_42_0.html ).

boost started supporting gcc 4.5 series in v1.44, And the gcc 4.5.2 of natty is a "primary" test compiler since v1.46.

A newer boost package should be made available. 1.42 is from Feb,2010 -- 15 months old (see bug #754231).

Steps to reproduce:

$ cat test.cpp
#include <boost/thread.hpp>
$ g++ -std=c++0x -c test.cpp
In file included from /usr/include/boost/thread/thread.hpp:22:0,
                 from /usr/include/boost/thread.hpp:13,
                 from test.cpp:1:
/usr/include/boost/thread/detail/thread.hpp: In function ‘boost::thread&& boost::move(boost::thread&&)’:
/usr/include/boost/thread/detail/thread.hpp:349:16: error: invalid initialization of reference of type ‘boost::thread&&’ from expression of type ‘boost::thread’
In file included from /usr/include/boost/thread/detail/thread_heap_alloc.hpp:17:0,
                 from /usr/include/boost/thread/detail/thread.hpp:13,
                 from /usr/include/boost/thread/thread.hpp:22,
                 from /usr/include/boost/thread.hpp:13,
                 from test.cpp:1:
/usr/include/boost/thread/pthread/thread_heap_alloc.hpp: In function ‘T* boost::detail::heap_new(A1&&) [with T = boost::detail::thread_data<void (*)()>, A1 = void (*&)()]’:
/usr/include/boost/thread/detail/thread.hpp:130:95: instantiated from here
/usr/include/boost/thread/pthread/thread_heap_alloc.hpp:24:47: error: cannot bind ‘void (*)()’ lvalue to ‘void (*&&)()’
/usr/include/boost/thread/detail/thread.hpp:43:13: error: initializing argument 1 of ‘boost::detail::thread_data<F>::thread_data(F&&) [with F = void (*)()]’
In file included from /usr/include/boost/thread/pthread/mutex.hpp:11:0,
                 from /usr/include/boost/thread/mutex.hpp:16,
                 from /usr/include/boost/thread/pthread/thread_data.hpp:12,
                 from /usr/include/boost/thread/thread.hpp:17,
                 from /usr/include/boost/thread.hpp:13,
                 from test.cpp:1:
/usr/include/boost/thread/locks.hpp: In member function ‘boost::unique_lock<Mutex>& boost::unique_lock<Mutex>::operator=(boost::unique_lock<Mutex>&&) [with Mutex = boost::mutex, boost::unique_lock<Mutex> = boost::unique_lock<boost::mutex>]’:
/usr/include/boost/thread/future.hpp:414:91: instantiated from here
/usr/include/boost/thread/locks.hpp:269:13: error: cannot bind ‘boost::unique_lock<boost::mutex>’ lvalue to ‘boost::unique_lock<boost::mutex>&&’
/usr/include/boost/thread/locks.hpp:279:14: error: initializing argument 1 of ‘void boost::unique_lock<Mutex>::swap(boost::unique_lock<Mutex>&&) [with Mutex = boost::mutex, boost::unique_lock<Mutex> = boost::unique_lock<boost::mutex>]’

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libboost1.42-dev 1.42.0-4ubuntu2 [modified: usr/include/boost/config/compiler/gcc.hpp]
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Wed May 4 12:39:03 2011
ProcEnviron:
 LANGUAGE=en_AU:
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: boost1.42
UpgradeStatus: No upgrade log present (probably fresh install)

[Trent Apted (tapted)]

oh, regarding:
Package: libboost1.42-dev 1.42.0-4ubuntu2 [modified: usr/include/boost/config/compiler/gcc.hpp]

*After* generating the compile error, I commented out `# define BOOST_HAS_RVALUE_REFS` in

#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 2)) && defined(__GXX_EXPERIMENTAL_CXX0X__)
// C++0x features are only enabled when -std=c++0x or -std=gnu++0x are
// passed on the command line, which in turn defines
// __GXX_EXPERIMENTAL_CXX0X__.
# define BOOST_HAS_DECLTYPE
//# define BOOST_HAS_RVALUE_REFS
# define BOOST_HAS_STATIC_ASSERT
# define BOOST_HAS_VARIADIC_TMPL
#else

With this change, test.cpp compiles.

Sadly, there's no compile flag I can pass in along with `-std=c++0x` to achieve a similar effect (i.e. without editing gcc.hpp).

[Dennis Schridde (devurandom)]

Architecture: i386
DistroRelease: Ubuntu 11.04
InstallationMedia: Kubuntu-Netbook 10.04 "Lucid Lynx" - Beta i386 (20100318)
Package: libboost-dev 1.42.0.1ubuntu1
PackageArchitecture: i386
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Tags: natty
Uname: Linux 2.6.38-10-generic i686
UpgradeStatus: Upgraded to natty on 2011-04-28 (85 days ago)
UserGroups: adm admin cdrom dialout fuse lpadmin netdev plugdev sambashare

[Dennis Schridde (devurandom)]

apport information

[Dennis Schridde (devurandom)]

Confirming that the workaround from comment #2 makes my application compile, which previously failed with:
/usr/include/boost/thread/detail/thread.hpp:349:16: error: invalid initialization of reference of type 'boost::thread&&' from expression of type 'boost::thread'

[BaCh (bach)]

I am running Kubuntu 11.10 and that bug is still present. I see the importance still set to "Undecided".

May I suggest to set it to a quite high level? C++11 is now officially through, having "-std=c++0x" or "-std=c++11" is getting more and more common, having GCC fail on BOOST on recent *buntu platforms is not good.

The workaround will work, but many users who just want to "./configure; make" a package will shy off performing the edits (even if they have the rights).