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[serialization] linker error with static build of serialization on Mingw gcc 4.4.0
by Philipp Münzel 18 Oct '10

18 Oct '10

Hi fellow users, I build boost 1.43 on windows, using mingw with gcc 4.4.0: Using built-in specs. Target: mingw32 Configured with: ../gcc-4.4.0/configure --enable-languages=c,ada,c++,fortran,java,objc,obj-c++ --disable-sjlj-exceptions --enable-shared --enable-libgcj --enable-libgomp --with-dwarf2 --disable-win32-registry --enable-libstdcxx-debug --enable-version-specific-runtime-libs --prefix=/mingw --with-gmp=/mingw/src/gmp/root --with-mpfr=/mingw/src/mpfr/root --build=mingw32 Thread model: win32 gcc version 4.4.0 (GCC) with the following command: bjam.exe install -q --layout=system --with-system --with-thread --with-python --with-serialization toolset=gcc variant=release link=static threading=multi runtime-link=static When I now build a shared library, itself linking statically the libboost_serialization.a, I get the following linker error: Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE12get_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE12is_destroyedEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE18get_const_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE20get_mutable_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE12get_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE12is_destroyedEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE18get_const_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE20get_mutable_instanceEv: symbol not found collect2: ld returned 1 exit status Am I missing some build step? Regards, Philipp

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VS Debugging Filter [WAS: boost.foreach overhead]
by Dominique Devienne 18 Oct '10

18 Oct '10

On Sun, Oct 17, 2010 at 6:29 PM, OvermindDL1 <overminddl1(a)gmail.com> wrote: > On Sun, Oct 17, 2010 at 3:47 PM, Eric Niebler <eric(a)boostpro.com> wrote: >> What debugger do you use? Visual Studio doesn't give me this grief. > > Ditto, but even if it did I could setup a debugging filter in it to > ignore the extra steps in the VS debugger, can you not do that in GDB? Would someone be kind enough to provide pointers or expand on these debugging filters? I've used in the past a registry key to avoid stepping into some functions/methods. Is this it? Thanks, --DD

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How to improve property_tree performance
by Bo Jensen 18 Oct '10

18 Oct '10

Hi, I have a fairly easy record structure which I am writing to xml using property_tree. I am trying to figure out how to do it better, since the current time spend building the tree is too high. I do the following : wiptree pt; wiptree &tvars = pt.add(L"some.recordname",L""); for( int i = 0; i < somenumber /*say 60K*/; ++i ) { wiptree &curtree = tvars.add(L"someitem",L""); curtree.add(L"<xmlattr>.name",L"some_attribute"); ... } To me this seems reasonable. Is there a faster way to do this ? Since I just want to write it out and it's quite simple, I could avoid using property_tree and write the xml file manually. But since I read it in later with property_tree, then for maintainability I would like to read and write with the same method. Thanks Bo

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Re: [Boost-users] [serialization] can I serialize concrete types that are not acessible where the archive is created
by Massaro Alessio 18 Oct '10

18 Oct '10

I eventually managed to get everything to work nicely Just one essential bit that seems to be missing in the docuemntation...at least I missed it :-) **** Use the ***DLL version*** of boost serialization (#define BOOST_ALL_DYN_LINK or BOOST_SERIALIZATION_DYN_LINK in your build) Otherwise, afaict, every DLL gets a separate static extended type-info singleton container. **** And, to anwer my own question, the documentation does say explicitly that non-rtti and rtti implementations of extended type-info can coexist. Hopefully, this will help other newbies!

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Set time boost::date_time
by Lloyd 18 Oct '10

18 Oct '10

Hi, How can I set the system time using boost? I have gone through boost date_time, but could not find a method to set the time. The time is in UTC. Thanks, Lloyd ______________________________________ Scanned and protected by Email scanner

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[Test] Seeking advice for writing effective performance tests
by Bryce Lelbach 18 Oct '10

18 Oct '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 How do I write accurate, empirical and reproducible performance tests? I realize this is a very broad question, but my knowledge on this subject is lacking, so I'd appreciate a comprehensive answer (e.g. I'm not looking to benchmark a particular program/library, just looking for a strategy for designing good performance tests). I have read up on the subject, but I'm interested in what you guys (e.g. Boost users/developers) do. - -- Bryce Lelbach aka wash http://groups.google.com/group/ariel_devel -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAky4yvsACgkQO/fqqIuE2t4WFQCcDXQWdg2Dr4WXialrZWMnSnii 2PAAoK8BbHS42t6utnzjSWxlMWYKXh+O =qJFv -----END PGP SIGNATURE-----

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[OT] Calling Overmind
by John Phillips 18 Oct '10

18 Oct '10

Overmind, Would you please contact either me (John Phillips) or Ron Garcia off list? Thanks. John

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boost asio: repeated reading to delimiter
by Cattus Cerebrum 17 Oct '10

17 Oct '10

A very newbie question from a beginner user of boost::asio. I have used BSD socket interface a lot in the past, and would like to start using boost::asio for my networking code. I have a server that is providing data through a network socket. The data is a continuous stream of bytes, with different data elements separated from each other by a zero byte. Would reading into a streambuf with the help of async_read_until() be a good way of handling this situation? The code I am thinking of replacing uses select() to wait for arriving data, and then reads it into a circular buffer. Thanks.

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Forward declarations and iterator_facade<>
by Phil Endecott 17 Oct '10

17 Oct '10

Dear Experts, I have code something like this: struct S; class iter: public boost::iterator_facade<iter,S,......> { ... }; struct S { ... }; This used to work, but stopped recently; I believe it may have been after upgrading gcc, not after upgrading Boost itself, but I'm uncertain about that. The problem is that something inside iterator_facade calls boost::is_POD<S>, which (not unreasonably) doesn't seem to work for the forward-declared S. I've never been entirely sure what you're allowed to do with forward-declared types like that. Was I just lucky that it worked before, or is this a regression? Re-ordering the code to remove the circular dependencies will be painful, so if anyone has any other hints I would love to hear them. Thanks, Phil.

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link error on serialization demo.cpp
by jiryih.tsaur＠nomura.com 16 Oct '10

16 Oct '10

Tried to compile demo.cpp and getting link error below. Any suggestions? g++ -c -I. -I/usr/include -I/usr/include/c++/4.1.2 -I/usr/include/boost -I/home/jitsaur/usr/include -g -D_DEBUG -o demo.o demo.cpp g++ -I. -I/usr/include -I/usr/include/c++/4.1.2 -I/usr/include/boost -I/home/jitsaur/usr/include -g -D_DEBUG -o demo demo.o demo.o: In function `archive_exception': /home/jitsaur/usr/include/boost/archive/archive_exception.hpp:45: undefined reference to `vtable for boost::archive::archive_exception' ... PLEASE READ: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please delete it and all copies from your system, destroy any hard copies and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Nomura Holding America Inc., Nomura Securities International, Inc, and their respective subsidiaries each reserve the right to monitor all e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorized to state the views of such entity. Unless otherwise stated, any pricing information in this message is indicative only, is subject to change and does not constitute an offer to deal at any price quoted. Any reference to the terms of executed transactions should be treated as preliminary only and subject to our formal written confirmation.

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