October 2016 - Boost-users - lists.preview.boost.org

Boost test failures on arm platform
by Carlos Ferreira 13 Oct '16

13 Oct '16

Hello! I'm cross-compiling Boost to an arm platform and because of that, boost fails to execute the cxx11_* tests and then it outputs the information that the compiler does not support a series of cxx11_* capabilities. Is there a way to disable these library tests, when cross-compiling? -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - cmf(a)av.it.pt Skype & GTalk -> carlosmf.pt(a)gmail.com LinkedIn -> http://www.linkedin.com/in/carlosmferreira

2 16

Announcing version 3 of the cxx_dual library
by Edward Diener 12 Oct '16

12 Oct '16

I have created version 3 of the cxx_dual library. version 3 is a large rewrite of the documentation to simplify the use of the library, as well as a change in the directory structure so that the basic usage of the library is through a single header file and the use of a namespace alias, and not through the macro interface. As in: #include <boost/cxx_dual/regex.hpp> void SomeFunction() { cxxd_regex_ns::regex re("A regular expression etc."); bool result(cxxd_regex_ns::regex_match("Some string...",re)); // etc. } What ! No macros ! Actually a few macros still exist for testing which dual library has been chosen and overriding the dual library chosen, but the basic functionality means almost no macros in user code. The library is available at https://github.com/eldiener/cxx_dual.git. What is it ? The Cxx Dual library, or CXXD for short, is a C++ macro header-only library which chooses between using a Boost library or its C++ standard equivalent library for a number of different C++ implementations, while allowing the end-user to use the same code to program either choice. An implementation is a Boost library which has a C++ standard library equivalent whose public interfaces are nearly the same in both cases. An 'implementation' is called a 'mod' for short and each of the possible Boost or C++ standard implementations for that mod are called a 'dual library'. The Cxx Dual library does this by automatically choosing either the Boost library or the C++ standard library for a particular mod, including the correct header file(s) needed for the dual library chosen, and creating a namespace alias for the namespace of the dual library chosen. CXXD also provides a macro-based solution for distinguishing between the Boost version and the C++ standard version of a dual library so that specific code for a particular dual library choice may be written in those cases where the public interfaces diverge.

1 0

Issues trying to use boost::unordered_map
by Ram 11 Oct '16

11 Oct '16

Hi, I am trying to use a boost::unordered_map as a member of my class. The unordered_map is defined as, boost::unordered_map<int, int> a; as a private member in the class. I have included #include "boost/unordered_map.hpp" using namespace boost; This is the compilation error I get, x_objs.cpp c:\codeworks\common\lib\boost\boost\unordered\detail\buckets.hpp(767) : error C2059: syntax error : '(' c:\codeworks\common\lib\boost\boost\unordered\detail\buckets.hpp(766) : while compiling class template member function 'void boost::unordered::detail::functions<H,P>::construct(bool,const H &,const P &)' with [ H=boost::hash<int>, P=std::equal_to<int> ] c:\codeworks\common\lib\boost\boost\unordered\detail\table.hpp(152) : see reference to class template instantiation 'boost::unordered::detail::functions<H,P>' being compiled with [ H=boost::hash<int>, P=std::equal_to<int> ] c:\codeworks\common\lib\boost\boost\unordered\detail\unique.hpp(179) : see reference to class template instantiation 'boost::unordered::detail::table<Types>' being compiled with [ Types=boost::unordered::detail::map<std::allocator<std::pair<const int,int>>,int,int,boost::hash<int>,std::equal_to<int>> ] c:\codeworks\common\lib\boost\boost\unordered\unordered_map.hpp(74) : see reference to class template instantiation 'boost::unordered::detail::table_impl<Types>' being compiled with [ Types=boost::unordered::detail::map<std::allocator<std::pair<const int,int>>,int,int,boost::hash<int>,std::equal_to<int>> ] c:\codeworks\sample_issue.h(276) : see reference to class template instantiation 'boost::unordered::unordered_map<K,T>' being compiled with [ K=int, T=int ] li_pip.cpp ld_pip.cpp pip.cpp . . . Can someone please help me? Thanks, Ram

6 39

[fiber] Asio autoecho example crashes (VS 2015 u3)
by DePizzottri 11 Oct '16

11 Oct '16

Hi all, I'm found that asio autoecho example crashes after main's return statement. Debugger shows write access from the fiber scheduler to the already destroed io_service. Substitution reference to io_service: boost::asio::io_service & io_svc_; in round_robin algo to the shared_ptr: boost::shared_ptr<boost::asio::io_service> io_svc_; with approprieate correction of the other code solves the problem. Maybe I misunderstood something in the descrition from documentation? Or its some kind of feature? -- View this message in context: http://boost.2283326.n4.nabble.com/fiber-Asio-autoecho-example-crashes-VS-2… Sent from the Boost - Users mailing list archive at Nabble.com.

2 4

Re: [Boost-users] [ASIO] Do coroutines allow serving multiple clients at once?
by mmarkd9＠libero.it 10 Oct '16

10 Oct '16

Thanks, does spawning a coroutine also spawn a new thread? I'd be inclined to think so from what you told me

2 1

R: Re: [ASIO] Do coroutines allow serving multiple clients at once?
by mmarkd9＠libero.it 10 Oct '16

10 Oct '16

Thanks, does spawning a coroutine also spawn a new thread? I'd be inclined to think so from what you told me ----Messaggio originale---- Da: "Oliver Kowalke" <oliver.kowalke(a)gmail.com> Data: 10-ott-2016 15.19 A: "boost-users"<boost-users(a)lists.boost.org> Ogg: Re: [Boost-users] [ASIO] Do coroutines allow serving multiple clients at once? 2016-10-10 9:44 GMT+02:00 mmarkd9(a)libero.it <mmarkd9(a)libero.it>: I'd like to know if this code is able to serve multiple clients connecting at the same time to the server. I would say no. You spawn only one coroutine that calls in the for-loop async. operations of accept(), read() and write() in a sequence. No other client is able to connect to your server, e.g. connect() on the client side returns, until you enter accept() again. In order to serve multiple clients at the same time you need to spawn a coroutine that accepts new connections and for each client request (read()/write() operations) you need to spawn a new coroutine.

1 0

Re: [Boost-users] [ASIO] Do coroutines allow serving multiple clients at once?
by mmarkd9＠libero.it 10 Oct '16

10 Oct '16

Thanks, does spawning a coroutine also spawn a new thread? I'd be inclined to think so from what you told me

1 0

[Boost.Filesystem] crashes in static destruction of global string object
by Nguyen Huu Hai 10 Oct '16

10 Oct '16

Hello, libs/filesytem/src/portability.cpp defines valid_posix as a std::string object instead of a const char * pointer. May I know if there are reasons for that? I'm using Boost.Filesystem as a shared library and my processes crash on exit with stack traces pointing to the static destruction of valid_posix. Making it const char* fixes the crashes. Regards, Hai

2 2

[ASIO] Do coroutines allow serving multiple clients at once?
by mmarkd9＠libero.it 10 Oct '16

10 Oct '16

I'm using ASIO with coroutines2 to create a ssl echo server. The code I've been experimenting is the following: http://nopaste.linux-dev.org/?1120051 While this is highly readable compared to the asynchronous callbacks version (thanks coroutines), I'd like to know if this code is able to serve multiple clients connecting at the same time to the server. In theory, every time I return control to the io_service object (i.e. I yield in the spawn coroutine) it should take care of whatever connection is pending / buffered / scheduled to be accepted next, right? Is this a reliable way to handle multiple requests? I don't plan on supporting massive workloads (e.g. 500k connections at once) but having some resilience would be nice indeed. Any other thoughts/tips are also warmly welcome.

2 1

Epoch to date
by Philippe de Rochambeau 09 Oct '16

09 Oct '16

Hello, how do you convert an Unix epoch (e.g., 1476015285) to a formatted date string (e.g., 1984-01-01) with Boost? Many thanks. Philippe

2 1

BoostLog and BoostASIO don't seem to play nice together
by james 08 Oct '16

08 Oct '16

Hi, I'm facing pretty much the same issue as was reported here in 2014: http://boost.2283326.n4.nabble.com/Boostlog-and-ASIO-crash-in-shared-librar… In short, I have a .so that wraps BoostASIO to create a HTTP client. Loading this .so into a program that also uses BoostLog results in either a segfault or no callbacks being fired (even async_resolve which I believe should eventually time-out). Removing all uses of and linking to BoostLog in the main program makes it all work again. Before I try to produce a minimum example, is this a known issue? Code is built with BOOST_LOG_DYN_LINK, asio is header only. We're using boost 1.55, and g++ (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4 Thanks James

1 0

graph strongly connected components
by Mika S 07 Oct '16

07 Oct '16

I am trying to use the implementation for strongly connected components http://www.boost.org/doc/libs/1_61_0/libs/graph/doc/strong_components.html Is this the iterative or the recursive implementation of tarjan's algorithm ?

2 2

GCC 5.3.0 failing Features Check when building Boost
by Carlos Ferreira 06 Oct '16

06 Oct '16

Hello I'm having some issues regarding the features check, when build Boost using OpenWRT GCC 5.3.0 cross-compiler for armv7. I'm building against musl. I have passed -std=c++14 to the cxxflags, but it seems to have no effect. This is the features output > - 32-bit : yes > - arm : yes > - symlinks supported : yes > - C++11 mutex : yes > - lockfree boost::atomic_flag : no > - Boost.Config Feature Check: cxx11_auto_declarations : no > - Boost.Config Feature Check: cxx11_constexpr : no > - Boost.Config Feature Check: cxx11_defaulted_functions : no > - Boost.Config Feature Check: cxx11_final : no > - Boost.Config Feature Check: cxx11_hdr_tuple : no > - Boost.Config Feature Check: cxx11_lambdas : no > - Boost.Config Feature Check: cxx11_noexcept : no > - Boost.Config Feature Check: cxx11_nullptr : no > - Boost.Config Feature Check: cxx11_rvalue_references : no > - Boost.Config Feature Check: cxx11_template_aliases : no > - Boost.Config Feature Check: cxx11_thread_local : no > - Boost.Config Feature Check: cxx11_variadic_templates : no > - has_icu builds : no > warning: Graph library does not contain MPI-based parallel components. > note: to enable them, add "using mpi ;" to your user-config.jam > - zlib : yes > - iconv (libc) : no > - iconv (separate) : yes > - icu : no > - icu (lib64) : no > - native-atomic-int32-supported : yes > - pthread-supports-robust-mutexes : yes > - compiler-supports-visibility : yes > - gcc visibility : yes > - long double support : yes > - zlib : yes What am I missing, so that all those cxx_* features can be checked? -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - cmf(a)av.it.pt Skype & GTalk -> carlosmf.pt(a)gmail.com LinkedIn -> http://www.linkedin.com/in/carlosmferreira

1 1

[regex] link error on upgrade to 1.62.0
by James Walker 05 Oct '16

05 Oct '16

Hi, I'm trying to update from 1.60.0 to 1.62.0 on Mac with Xcode 4.6.3, and I'm getting link errors on Regex. I am definitely compiling all 17 of the .cpp files in libs/regex/src. The errors are shown below. Any idea what I might be missing? Undefined symbols for architecture i386: "boost::re_detail_106200::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)", referenced from: boost::re_detail_106200::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*) in BVHJointMap.o boost::re_detail_106200::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*) in AnimationsManager.o "boost::re_detail_106200::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::find()", referenced from: bool boost::regex_search<char const*, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) in BVHJointMap.o "boost::re_detail_106200::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()", referenced from: bool boost::regex_match<char const*, std::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) in AnimationsManager.o ld: symbol(s) not found for architecture i386

1 1

boost::asio cross-library link issue
by Stanley Friesen 05 Oct '16

05 Oct '16

We are using Boost 1.54. The issue i have is a strange problem with the ASIO library. We have two libraries build using ASIO from Boost 1.54 (libpcl and one of our own libraries). For some reason, despite being built with the same version of boost, the layout of class task_io_service differs between the two libraries. The member function instantiations are in the libraries as weak symbols, so we do not get a link error, but which version of each function that is called from any given place is unpredictable, and varies when we change out own code. In particular, at least op_queue_ and all following members have offsets that differ by 8 bytes (the size of a 64-bit pointer) between the two builds. The result is that sometimes the op_queue back pointer is corrupted (by the other version setting stopped_), or the stop flag is not seen because it was set by the other build. The result is either that run() returns immediately without doing anything, or out application crashes from trying to dereference an invalid pointer. (Often what is supposed to be a NULL back pointer is set to 1, which does not compare equal to NULL). I have looked for conditionally compiled elements in task_io_service, op_queue, and epoll_reactor with no luck. I can see no reason the two library builds should end up with different class layouts. So, does anybody have any clue what might be happening here? Or how to go about fixing the problem? [I hesitate to try forcing strong symbols in our library, since this would break libpcl, due to many functions being inline]. -- View this message in context: http://boost.2283326.n4.nabble.com/boost-asio-cross-library-link-issue-tp46… Sent from the Boost - Users mailing list archive at Nabble.com.

5 8

Different checksums for different SourceForge locations
by Carlos Ferreira 05 Oct '16

05 Oct '16

I'm having some issues in downloading the Boost 1.62 package from the SF servers. It seems that the Eastern US servers checksum values are not matching the rest of the servers, nor the checksum values provided at the Boost.org website. Is there anyone else having the same problem? -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - cmf(a)av.it.pt Skype & GTalk -> carlosmf.pt(a)gmail.com LinkedIn -> http://www.linkedin.com/in/carlosmferreira

2 8

Need help with errors while building boost for clang on android NDK
by Robert Dailey 04 Oct '16

04 Oct '16

I'm using NDK r11 and I'm setting up project-config.jam to build boost using clang + llvm STL. I'm running into a few errors that I do not know how to solve. I will post my config file at the bottom. First problem is that boost does not know where to find tools 'ar' and 'ranlib': clang-linux.archive bin.v2\libs\container\build\clang-linux-android\release\link-static\runtime-link-static\target-os-linux\threading-multi\libboost_container-clang-mt-s-1_61.a '"ar"' is not recognized as an internal or external command, operable program or batch file. '"ranlib"' is not recognized as an internal or external command, operable program or batch file. How can I explicitly specify the NDK path to these executables? Second problem is related to some assembler stuff, I think. I get these errors while compiling boost thread: clang-linux.compile.asm bin.v2\libs\context\build\clang-linux-android\release\link-static\runtime-link-static\target-os-linux\threading-multi\asm\make_i386_ms_pe_gas.o libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:1: error: unknown directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:22: error: unknown directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:36: error: expected identifier in directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:40: error: unknown directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:136:1: error: unknown directive .def __exit; .scl 2; .type 32; .endef ^ How can I solve this? I have no idea at this point. I'm invoking the build using: b2 --without-python threading=multi link=static runtime-link=static toolset=gcc-android target-os=linux threadapi=pthread --stagedir=android stage And my project-config.jam looks like: import option ; option.set keep-going : false ; androidNDKRoot = E:/android/ndk ; androidAbiVer = 4.9 ; androidPlatform = windows-x86_64 ; using clang : android : $(androidNDKRoot)/toolchains/llvm/prebuilt/$(androidPlatform)/bin/clang++ : <compileflags>--sysroot=$(androidNDKRoot)/platforms/android-15/arch-arm <compileflags>-Os <compileflags>-fno-strict-aliasing <compileflags>-O2 <compileflags>-DNDEBUG <compileflags>-g <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++abi/libcxxabi/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/libcxx/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a <compileflags>-I$(androidNDKRoot)/sources/android/support/include <compileflags>-DANDROID <compileflags>-D__ANDROID__ <compileflags>-D__arm__ <compileflags>-D_REENTRANT ;

3 8

boost::lockfree::queue::reserve fail with fixed_sized = true
by Sam Sigbjørn 04 Oct '16

04 Oct '16

Hello, When i compile lockfree::queue with option fixed_sized set to true i get a compilation error in reserve: void reserve(size_type n) { pool.template reserve<true>(n); } Btw, MSC version is 190024210 (Update 3) and i defined _ENABLE_ATOMIC_ALIGNMENT_FIX Thanks

1 0

[release] Boost 1.62.0 release available
by Rene Rivera 04 Oct '16

04 Oct '16

Release 1.62.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains two new libraries and numerous enhancements and bug fixes for existing libraries. New Libraries * Fiber: Framework for userland-threads/fibers, from Oliver Kowalke. * QVM: Boost QVM is a generic library for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications, from Emil Dotchevski. For details, including download links, see http://www.boost.org/users/ news/version_1.62.0 You can also download directly from SourceForge: http://sourceforge.net/ projects/boost/files/boost/1.62.0/ The SHA256 checksums are as follows: b91c2cda8bee73ea613130e19e72c9589e9ef0357c4c5cc5f7523de82cce11f7 boost_1_62_0.7z 36c96b0f6155c98404091d8ceb48319a28279ca0333fba1ad8611eb90afb2ca0 boost_1_62_0.tar.bz2 440a59f8bc4023dbe6285c9998b0f7fa288468b889746b1ef00e8b36c559dce1 boost_1_62_0.tar.gz 084b2e0638bbe0975a9e43e21bc9ceae33ef11377aecab3268a57cf41e405d4e boost_1_62_0.zip Tom Kent has made pre-built windows binaries, and they are available at: https://sourceforge.net/projects/boost/files/boost-binaries/1.62.0/ To install this release on your system, see http://www.boost.org/doc/libs/ release/more/getting_started/index.html Thanks, --The Boost release team

3 5

boost 1.62 msvc compilation error : regression from 1.61 ?
by Julien Schueller 04 Oct '16

04 Oct '16

Hello, I'm trying to update from boost 1.61 to 1.62 on msvc for conda and encountered this error: [00:03:41] Performing configuration checks [00:03:41] [00:03:41] - 32-bit : yes ... [00:03:41] - x86 : yes [00:03:41] - symlinks supported : yes [00:03:41] - C++11 mutex : no [00:03:41] - Boost.Config Feature Check: cxx11_auto_declarations : no ... [00:03:42] - has_icu builds : no ... [00:03:43] - zlib : yes [00:03:43] error: at C:/conda/conda-bld/work/boost_1_62_0/tools/build/src/kernel\modules.jam:107 [00:03:43] error: Name clash for '<pbuildboost\boost\bin.v2\standalone\ac\msvc-9.0\release\link-static\threading-multi>main.obj' [00:03:43] error: [00:03:43] error: Tried to build the target twice, with property sets having [00:03:43] error: these incompatible properties: [00:03:43] error: [00:03:43] error: - <dll-path>C:\conda\envs\_build\Library\lib <library-path>C:\conda\envs\_build\Library\lib <xdll-path>C:\conda\envs\_build\Library\lib [00:03:43] error: - none [00:03:43] error: [00:03:43] error: Please make sure to have consistent requirements for these [00:03:43] error: properties everywhere in your project, especially for install [00:03:43] error: targets. [00:03:43] [00:03:43] Command failed: cmd.exe /c bld.bat [00:03:43] Command exited with code 1 Full logs are available here: https://ci.appveyor.com/project/conda-forge/boost-feedstock/build/1.0.36 I've got the same error for vc9, vc10 and vc14 for both 32 and 64bits. I configure with the exact same script I used for 1.61, here's the configure part: call bootstrap.bat .\b2 install ^ --build-dir=buildboost ^ --prefix=%LIBRARY_PREFIX% ^ toolset=msvc-%VSTRING%.0 ^ address-model=%ARCH% ^ variant=release ^ threading=multi ^ link=static,shared ^ -j%CPU_COUNT% ^ -s ZLIB_INCLUDE="%LIBRARY_INC%" ^ -s ZLIB_LIBPATH="%LIBRARY_LIB%" It can be seen there: https://github.com/conda-forge/boost-feedstock/blob/master/recipe/bld.bat I've not seen it reported in the trac tickets, did someone get the same error ? -- J Schueller

1 0

[Boost::asio] Problem using the same io_service with many sockets
by María Victoria Rocha 03 Oct '16

03 Oct '16

Hi all, I have defined an io_service that is used by two sockets, one of them uses tcp, and the other udp. When the callback of this async_read_some is called socket.async_read_some(boost::asio::buffer(readBuffer), boost::bind(&RequestHandler::onRead, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); A udp socket is created with the same io_service and an async_receive_from is called. On the callback of this read operation I try to write to the tcp socket but it captures an exception with message: "unknown exception". When this happens, the client that is listening to the tcp socket, receives "End of file" error. I resolved this problem with an io_service per socket but I would like to use the same io_service. Someone has any idea why this happens? Thanks! Victoria

2 1

[Thread] Thread library in boost 1.62 broken with g++ 4.6.3 and -std=c++0x
by Andreas Wehrmann 03 Oct '16

03 Oct '16

Hello folks, I've just wanted to try out the new release and noticed that the Thread library was not building. Assuming this code: #include <boost/thread.hpp> int main( void ) { return 0; } When compiled with -std=c++0x the compilation fails with: In file included from ./boost/boost_1_62_0/boost/exception/detail/exception_ptr.hpp:20:0, from ./boost/boost_1_62_0/boost/exception_ptr.hpp:9, from ./boost/boost_1_62_0/boost/thread/exceptional_ptr.hpp:10, from ./boost/boost_1_62_0/boost/thread/future.hpp:25, from ./boost/boost_1_62_0/boost/thread.hpp:24, from test.cpp:2: ./boost/boost_1_62_0/boost/exception/info.hpp: In instantiation of ‘boost::error_info<boost::tag_original_exception_type, const std::type_info*>’: ./boost/boost_1_62_0/boost/exception/detail/exception_ptr.hpp:95:32: instantiated from here ./boost/boost_1_62_0/boost/exception/info.hpp:66:5: error: ‘class boost::error_info<boost::tag_original_exception_type, const std::type_info*>’ has no member named ‘value_’ ./boost/boost_1_62_0/boost/container/detail/pair.hpp:85:30: warning: ‘boost::container::piecewise_construct’ defined but not used [-Wunused-variable] ./boost/boost_1_62_0/boost/system/error_code.hpp:221:36: warning: ‘boost::system::posix_category’ defined but not used [-Wunused-variable] ./boost/boost_1_62_0/boost/system/error_code.hpp:222:36: warning: ‘boost::system::errno_ecat’ defined but not used [-Wunused-variable] ./boost/boost_1_62_0/boost/system/error_code.hpp:223:36: warning: ‘boost::system::native_ecat’ defined but not used [-Wunused-variable] Compilation works if I don't use -std=c++0x. The exact compiler version is "g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3". I'm aware that g++ 4.6.3 is not among the compilers tested for C++11, but it is for pre-Cpp11; I'm wondering if there is a reason for that which I might not be aware of (any known problems?). Best regards, Andreas

3 2