November 2013 - Boost-users - lists.preview.boost.org

linking with boost log 1.54
by Ovanes Markarian 20 Nov '13

20 Nov '13

Hi *, I am stuck with a problem to link on linux (ubuntu 12.04) with a boost log library (clang 3.0 & libstdc++). No matter what I do it fails. The problem is: I have a 3rd party library which is delivered as an .so-module and I need to link with it. My project is organized so that we develop static libraries and link them with test or application runner executables. I currently build boost as static libraries only, after I link my project with log library I get tons of errors like: /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libpthread.a(nptl-init.o): In function `__pthread_initialize_minimal_internal': /build/buildd/eglibc-2.15/nptl/nptl-init.c:296: undefined reference to `__libc_setup_tls' /build/buildd/eglibc-2.15/nptl/nptl-init.c:314: undefined reference to `_dl_cpuclock_offset' /build/buildd/eglibc-2.15/nptl/nptl-init.c:430: undefined reference to `_dl_pagesize' /build/buildd/eglibc-2.15/nptl/nptl-init.c:456: undefined reference to `_dl_init_static_tls' /build/buildd/eglibc-2.15/nptl/nptl-init.c:458: undefined reference to `_dl_wait_lookup_done' /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libpthread.a(nptl-init.o): In function `__pthread_get_minstack': /build/buildd/eglibc-2.15/nptl/nptl-init.c:479: undefined reference to `_dl_pagesize' /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libpthread.a(pthread_create.o): In function `allocate_stack': /build/buildd/eglibc-2.15/nptl/allocatestack.c:457: undefined reference to `_dl_stack_flags' /build/buildd/eglibc-2.15/nptl/allocatestack.c:596: undefined reference to `_dl_stack_flags' /usr/local/lib/libboost_log-mt-s.a(text_file_backend.o): In function `boost::log::v2s_mt_posix::sinks::anonymous::file_collector::file_collector(boost::shared_ptr<boost::log::v2s_mt_posix::sinks::anonymous::file_collector_repository> const&, boost::filesystem::path const&, unsigned long, unsigned long)': libs/log/src/text_file_backend.cpp:(.text+0x60b): undefined reference to `boost::filesystem::detail::current_path(boost::system::error_code*)' libs/log/src/text_file_backend.cpp:(.text+0x65c): undefined reference to `boost::filesystem::absolute(boost::filesystem::path const&, boost::filesystem::path const&)' libs/log/src/text_file_backend.cpp:(.text+0x6b1): undefined reference to `boost::filesystem::detail::create_directories(boost::filesystem::path const&, boost::system::error_code*)' And so on. Do you have any hints or suggestions? Thanks, Ovanes

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[String_Ref] Working with other parts of boost
by Norbert Wenzel 20 Nov '13

20 Nov '13

Hi, I wanted to play around with Boost.String_Ref and found some old code that I thought would be the ideal case for string_refs. It's basically a config file reader that stores the whole line and also a key/value pair that may be found in that line. So a single line looked something like this: std::string line; //original line as is in the file boost::string_ref key; //extracted key subpart boost::string_ref value; //extracted value subpart But when I wanted to trim the string_refs (eg. for lexical_casting them) I got compile errors, because boost::trim uses erase, which of course is not supported by string_ref. But string_ref has the remove_prefix/suffix member functions, which would be exactly what trim needs. So I quickly hacked an additional overload of trim_*_if that calls the remove_*fix instead of the .erase() member function and it seemed to work. The second problem occurred when I tried to extract my key/value pair from a line using the Tokenizer, which seems to be old, but it still works for simple cases. Tokenizer internally uses assign() to fill an internal buffer with the next token, which of course is no member function of string_ref. Since it seems Tokenizer only uses the assign version that takes two iterators it might be possible to add such an assign() function to string_ref. At least I added one as a testcase locally and it worked in my limited testcase. Are there any plans to add either trim() or Tokenizer support for string_ref? I'm not sure about the Tokenizer/assign stuff, since one would have to change string_ref but I really think the trim() support would be helpful. Anyway, these issues kept me from actually using string_ref, since the code did not compile (or required changes to boost headers in order to compile). And I did not want to redo some of the boost string algorithm stuff in order to use string_refs. Norbert

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[Asio] Issues with kqueue_reactor, dynamic libraries and -fvisibility=hidden
by Andrei Bica 19 Nov '13

19 Nov '13

I'm having a problem with a larger project for MacOS which uses multiple dynamic libraries and asio features (deadline_timers and tcp/udp scokets). I've managed to reproduce my problem in the following minimal example: ////////// Timer.hpp ////////// #ifndef TIMER_HPP #define TIMER_HPP #include <boost/asio.hpp> #include <boost/thread.hpp> #define VISIBLE __attribute__ ((visibility ("default"))) class VISIBLE Timer { public: Timer(boost::asio::io_service& service); private: void onTimeout(const boost::system::error_code& code); boost::asio::deadline_timer timer; }; #endif // Timer_HPP ////////// Timer.cpp ////////// #include <Timer.hpp> Timer::Timer(boost::asio::io_service& service) : timer(service) { timer.expires_from_now(boost::posix_time::seconds(1)); timer.async_wait(boost::bind(&Timer::onTimeout, this, _1)); } void Timer::onTimeout(const boost::system::error_code& code) { std::cout << "The callback from the dynamic library was called." << std::endl; } ////////// main.cpp ////////// #include <Timer.hpp> boost::asio::io_service service; void run() { service.run(); } void onTimeout(const boost::system::error_code& code) { std::cout << "The callback from main was called." << std::endl; } int main() { Timer timer(service); boost::asio::deadline_timer deadline_timer(service); deadline_timer.expires_from_now(boost::posix_time::seconds(1)); deadline_timer.async_wait(boost::bind(&onTimeout, _1)); boost::thread t(boost::bind(&run)); t.join(); return 0; } Timer.cpp is compiled into a dynamic library and used by main.cpp which is compiled as an executable. The environment: MacOS 10.8.5, Boost 1.54.0, clang 500.2.79 The parameters which are passed to clang at compilation time are: clang++ -ggdb -c Timer.cpp -I. -I/opt/local/include -fPIC -fvisibility=hidden clang++ -ggdb -o libTimer.dylib -dynamiclib Timer.o -L/opt/local/lib -lboost_thread-mt -lboost_system-mt -fvisibility=hidden clang++ -ggdb main.cpp -o runTest -I. -I/opt/local/include -L. -L/opt/local/lib -lboost_thread-mt -lboost_system-mt -lTimer fvisibility=hidden As you can see the visibility is set to hidden at compilation time in order to expose only desired functions (e.g. the Timer class) from my library. The problem that arise is that the callback of the timer from main.cpp is never called. If I remove the visibility flag at compilation time the example works as it should (both timer callbacks are called). When I did further investigations I've observed that 2 kqueue_reactor instances are create when using hidden visibility and only one kqueue_reactor is created when visibility is set to default. I need an advise on how should I proceed so that I can still use the visibility set to hidden at compilation time but have the example working as expected. When compiling the example on Linux using visibility set to hidden the example works as expected. Regards, Andrei

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Compiling Boost 1.55.0 with Intel 14.0.1 and libstdc++ from GCC 4.8.1
by Maxime Boissonneault 19 Nov '13

19 Nov '13

Hi, I am attempting to build Boost 1.55.0 with Intel compiler 14.0.1, using the Standard C++ Library provided by GCC 4.8.1 I am having a lot of errors with "fenv". Here is a subset of those errors, with one particular object that is being built by the build script. The offending command line is "icpc" -c -xc++ -w1 -inline-level=2 -O3 -ip -fPIC -DBOOST_ALL_NO_LIB=1 -DBOOST_DATE_TIME_DYN_LINK=1 -DBOOST_FILESYSTEM_DYN_LINK=1 -DBOOST_LOG_BUILDING_THE_LIB=1 -DBOOST_LOG_DLL -DBOOST_LOG_NO_THREADS -DBOOST_LOG_USE_AVX2 -DBOOST_LOG_USE_NATIVE_SYSLOG -DBOOST_LOG_USE_SSSE3 -DBOOST_LOG_WITHOUT_EVENT_LOG -DBOOST_SPIRIT_USE_PHOENIX_V3=1 -DBOOST_SYSTEM_DYN_LINK=1 -DBOOST_THREAD_DONT_USE_CHRONO=1 -DDATE_TIME_INLINE -DNDEBUG -I"." -c -o "bin.v2/libs/log/build/intel-linux/release/log-api-unix/named_scope_format_parser.o" "libs/log/src/named_scope_format_parser.cpp" Errors are such as : In file included from ./boost/math/tools/promotion.hpp(26), from ./boost/math/special_functions/detail/round_fwd.hpp(12), from ./boost/math/special_functions/math_fwd.hpp(26), from ./boost/math/special_functions/fpclassify.hpp(19), from ./boost/spirit/home/support/detail/sign.hpp(22), from ./boost/spirit/home/karma/numeric/detail/numeric_utils.hpp(22), from ./boost/spirit/home/karma/numeric/uint.hpp(33), from ./boost/spirit/include/karma_uint.hpp(16), from libs/log/src/named_scope_format_parser.cpp(22): ./boost/math/tools/config.hpp(309): error: identifier "fexcept_t" is undefined fexcept_t m_flags; ^ In file included from ./boost/math/tools/promotion.hpp(26), from ./boost/math/special_functions/detail/round_fwd.hpp(12), from ./boost/math/special_functions/math_fwd.hpp(26), from ./boost/math/special_functions/fpclassify.hpp(19), from ./boost/spirit/home/support/detail/sign.hpp(22), from ./boost/spirit/home/karma/numeric/detail/numeric_utils.hpp(22), from ./boost/spirit/home/karma/numeric/uint.hpp(33), from ./boost/spirit/include/karma_uint.hpp(16), from libs/log/src/named_scope_format_parser.cpp(22): ./boost/math/tools/config.hpp(301): error: identifier "FE_INVALID" is undefined fegetexceptflag(&m_flags, FE_ALL_EXCEPT); I have the following set export CPLUS_INCLUDE_PATH=/software6/compilers/gcc/4.8.1/include/c++/4.8.1/ if I unset CPLUS_INCLUDE_PATH, this specific object compiles fine (with warnings, but no error). Does anyone have an idea of weither this is a bug with Intel compiler or with Boost ? Best regards, -- --------------------------------- Maxime Boissonneault Analyste de calcul - Calcul Québec, Université Laval Ph. D. en physique

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New Windows Build of 1.55.0
by Tom Kent 19 Nov '13

19 Nov '13

The previous build of 1.55.0 did not build with the correct zlib version (and thus the correct sub-library of iostreams did not build). I have created a 1.55.0-build2 directory on the sourceforge page with the updated version. I've also added a note to the 1.55.0/README.md file explaining that it is incomplete, but I did not remove the prior build. http://sourceforge.net/projects/boost/files/boost-binaries/1.55.0-build2/ Tom

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Issue with compilation using XCode 4.6/GCC
by Tim Burgess 18 Nov '13

18 Nov '13

Hi, I have a project for Windows/Mac that builds fine using VS2010, but generates errors when I build using Xcode 4.6 with the GCC compiler (required, as this project also uses wxWidgets). All of my modules compile cleanly, but I get the following "orphaned" error output that doesn't seem to belong to any module: SurfaceReader Group /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:28: '<anonymous enum>' is/uses anonymous type /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:28: Trying to instantiate 'template<class T> struct boost::remove_reference' /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:38: '<anonymous enum>' is/uses anonymous type /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:38: Trying to instantiate 'template<class T> struct boost::remove_reference' I realise that I haven't provided the command that Xcode is using to build the project - this isn't deliberate, but I can't seem to locate where Xcode provides this on-screen using the VoiceOver accessibility tool (I'm a totally blind developer). Can anybody offer any advice regarding decay.hpp errors (I'm not including it directly in any of my modules), or can direct to me to where I might find a log that would provide more detail as to the compilation options that Xcode is using (i.e. its GCC-equivalent command line)? Many thanks in advance. Best wishes. Tim Burgess

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Can gil library in boost 1.49 load png palette images?
by Guangchao Wang 18 Nov '13

18 Nov '13

I'm tried to load a png which can be found in the attachment, I find the color of this png is PNG_COLOR_TYPE_PALETTE and its depth is 8, I reviewed the code of png_io_private.hpp and found that no such type of PNG is supported. Can you give me some help about how to load such PNG with boost.gil library? Thank you very much. Best, Guangchao

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Did build of Boost succeed - lib vs. stage/lib?
by Lutz Gehlen 17 Nov '13

17 Nov '13

Hello all, I am trying to build the Boost libraries version 1.55.0 with Visual Studio 2010 Express under Windows XP. Following the instructions in the documentation, I have unpacked the source code distribution, opened a Visual Studio command line window, and executed bootstrap .\b2 I haven't noticed any errors, and I was told in the end that I had successfully built the Boost libraries. So far, so good. I then tried to build the example program in section 6 of the Getting started guide. Section 6.1 instructs to add "C:\Program Files\boost\boost_1_55_0\lib" (in my case E:\boost_1_55_0\lib) to the list of Additional Library Directories. However, I do not have a lib directory in E:\boost_1_55_0?! I tried to build the example program and then searched for the library file libboost_regex-vc100-mt-gd-1_55.lib that Visual Studio was failing to find. I found it in E:\boost_1_55_0\stage\lib instead of E:\boost_1_55_0\lib. Adding this directory to the list of Additional Library Directories allowed me to build and execute the example program successfully. However, I am wondering now whether my build worked correctly or not. I am trying to avoid running into subtle and hard to debug problems later. Does anyone know if or what went wrong with my build? What is the stage directory and is it safe to use it? Thank you very much for your help and best wishes Lutz

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the link to the documentation for "explicit bool operator" is broken
by Adam Romanek 17 Nov '13

17 Nov '13

Dear Boosters, I've just discovered that there's a broken link to the documentation of "explicit bool operator" macro on http://www.boost.org/doc/libs/1_55_0/libs/utility/index.html WBR, Adam Romanek

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Can I return std::unique_ptr in a boost::future?
by Aaron_Wright＠selinc.com 15 Nov '13

15 Nov '13

I'm trying to return a std::unique_ptr in a boost::future. I can't get it to compile. Is it possible? The code wraps a packaged_task in a functor to make it copyable enough to pass to a boost::asio::io_service, where the work will be done in another thread. The code works for other return types that are copyable. This is what I have for a small test case: std::unique_ptr< int > get_int_impl(int i) { return std::unique_ptr< int >(new int(i)); } std::unique_ptr< int > get_int(int i) { typedef boost::packaged_task< std::unique_ptr< int > > Task; boost::shared_ptr< Task > task = boost::make_shared< Task >(boost::bind(&get_int_impl, 42)); boost::unique_future< std::unique_ptr< int > > future = task->get_future(); // <--- Error from this line. m_service.post(boost::bind(&Task::operator(), task)); return future.get(); } BOOST_AUTO_TEST_CASE(test_get_int) { BOOST_CHECK_EQUAL(*get_int(42), 42); } The error: boost/thread/future.hpp(239): error C2248: 'std::unique_ptr<_Ty>::unique_ptr' : cannot access private member declared in class 'std::unique_ptr<_Ty>' --- Aaron Wright

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