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[python] Help with boost python build
by Andy Thomason 10 Aug '15

10 Aug '15

Hi All, I have had highly variable results with Boost.Python mostly due to linker errors or failures of Python to find DLLs. Python is not great at reporting why it fails, for example not naming failures to load dependent DLLs on Windows which does not make this a joyous experience. I have never managed to get any Boost.Python example - mine or otherwise - working on Windows and have had limited success on Linux. It is little surprise that all the examples on Stackoverflow avoid Bjam for builds. For my genetics library, I have an example that has a single source file and the Jamfile reads thus: python-extension genetics : bindings.cpp : <toolset>gcc:<cxxflags>-std=c++11 ; with: using python : 2.7 ; in ~/boost-config.jam ie. as minimal as possible. This builds well on linux (I am adding a library to the head of modular boost). When I run: python -c "import genetics" with appropriate PYTHONPATH I get a run-time symbol search error: ImportError: <...>/genetics.so: undefined symbol: _ZNK5boost6python7objects21py_function_impl_base9max_arityEv My guess would be that rather than this one symbol, Python is failing to load the shared lib: ~/modular-boost/bin.v2/libs/python/build/gcc-4.8/debug/libboost_python.so.1.59.0 As a postscript, It would be lovely if there were no static or dynamic libraries to link with when compiling with Boost.Python and a unity build would be a nice option as this would bypass linker and runtime related errors. It would probably compile faster in my long experience with such projects. Any help would be welcome. Andy. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com

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[regression tests] Adding regression tests for mingw(-64)/gcc and clang on Windows
by Edward Diener 10 Aug '15

10 Aug '15

I don't know if I am supposed to ask questions about running regression tests in this mailing list or in the Boost testing mailing list, but I will try here first. The Boost testing mailing list seems to be for actual test result problems and the like. For a long time now we have had no regression tests for mingw/gcc or clang targeting gcc on Windows. The only regression tests for Windows are for various releases of VC++. I have limited resources but I have a laptop usually sitting idle, except for occasional travel where I take it with me, and I am set up to run tests on that machine for mingw/gcc and clang on Windows. However mingw/gcc and clang have limitations when running tests in that, both relying on various mingw/gcc implementations, the path to the implementation must be added at the beginning of the PATH before running any of the tests. I have already argued with the mingw-64 people about this necessity but they are adamant that this should be the case even just to compile/link properly ( and have setup their directory structure to enforce it ), and I don't want to waste my breath further with them. Currently I have a batch file that does that for me when running tests for aany particular library, but I don't know how that can be achieved when running the regression tests unless possibly I run regression tests for only a single toolset at a time, and manipulate the PATH accodingly. But that is really time consuming since evidently all of Boost must be downloaded to the run directory each time. Is there an easy solution to this or do I have to look at run.py and try modify it accordingly ( I know Python well ) ? Also I notice on the Boost web site regression test page ( http://www.boost.org/development/running_regression_tests.html ) that the options of the regression tests are somewhat documented but none of the commands are documented. Is there further documentation about the regression test commands anywhere ?

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Build Error VS14 + Intel 15.0 (Update 4, the latest)
by degski 10 Aug '15

10 Aug '15

I have encountered the following error when building boost 1.58 (and 1.59-b1): C:/boost_1_58_0/tools/build/src/tools\intel-win.jam:194: in configure-really from module intel-win error: msvc 14 not supported for intel toolset version 15.0 I'm using the following line to build boost: bjam -a -d+2 --toolset=intel-15.0-vc14 "-sINTEL_PATH=C:\Program Files (x86)\Intel\Composer XE 2015\bin\intel64" cxxflags="/O2 /Quse-intel-optimized-headers /Qstd=c++14 /Qipo /Zc:forScope /Oi /MT /EHsc /Qparallel" "-sINTEL_BASE_MSVC_TOOLSET=vc-14_0" "-sINTEL_VERSION=15" "-sZLIB_SOURCE=%HOME%\zlib-1.2.8" "-sBZIP2_SOURCE=%HOME%\bzip2-1.0.6" variant=release instruction-set=nehalem threading=multi link=static runtime-link=static --stagedir=stage64_static address-model=64 architecture=x86 --without-python --without-mpi --disable-filesystem2 stage > icc_log_stage.log The above worked fine with VS11 and Intel 15.0. The combo (VS14/ICC15) is obviously supported by (MS/Intel), and works fine in the IDE (Community Edition). I confirm the problem with bootstrap.bat, this has been around for a long time, and always had to build the 32bit version first. I ran into it as I have decided to stop building 32-bit. The obvious work-around is to build bjam seperately, not a killer for me, but might be for some. The main issue I report, is though and it would be a shame if the 1.59 release would not allow for that combo, as finally MS have released a free, non-crippled, release of their IDE with (finally, in 2015) full support for C++11... I'm happy to test some things out if necessary, I'm not capable of adressing the issue though...

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Re: [boost] [asio-users] [http] Formal review of Boost.Http
by Lee Clagett 09 Aug '15

09 Aug '15

On Sat, Aug 8, 2015 at 5:16 AM, Vinícius dos Santos Oliveira < vinipsmaker(a)users.sf.net> wrote: > 2015-08-08 0:10 GMT-03:00 Lee Clagett <forum(a)leeclagett.com>: > >> FWIW it should be possible to do client and server side pipelining with >> this design right now. The reads and writes of the HTTP Socket concept >> should be (and currently are by `basic_socket`) handled independently. >> Since the notification for a write completion is based on the lower layer >> write completion, and NOT whether a HTTP response was received, multiple >> (pipelined) requests should be possible by a client. Similarly, this design >> should allow servers to handle pipelined requests in parrallel. Providing a >> framework for client or server pipelining will require more work, and >> should probably not be a part of the Socket concept. In fact - >> > > The current design **does** support pipelining. Some HTTP clients disable > pipelining because some buggy servers will get confuse. This won't happen > with Boost.Http (there are tests to ensure pipelning is working). > > What the current design does **not** support is handling pipelined > requests concurrently. When you starting read a request, the write_state[1] > will change to finished until the fully request is received, so you can't > get multiple request while you don't issue the replies. This behaviour is > explained in the ServerSocket concept[2]. > > There are just too many ways to allow HTTP concurrent pipeline that would > be transparent for the user, but all of them are heavier. If I was to allow > handling multiple concurrent HTTP pipelined requests, I'd expose user > cooperation, so the abstraction doesn't become so heavy. The user would > need to be aware if the reply for some request can already be delivered or > not. Of course this means the socket will need to remember order and attach > some id to the request messages. It can be problematic in alternative > backends because the id could be of a different type and makes it difficult > to use the same message type with different HTTP backends. What do you > think? The design would just be more complex for not much gain. HTTP/2.0 > allow real multiplexing and doesn't show this problem. > I agree that providing any pipelining framework in the library is probably unnecessary right now. However, the design should not inhibit such functionality from being added (which I do not think is a problem with this design). > I think the ServerSocket concept should be removed entirely. The >> `http::basic_socket<...>` models both concepts, so theres lots of server >> specific code in it, which seems confusing to me (is this really a "basic" >> socket?). >> > > basic_socket uses basic_ prefix just like basic_string. > I was asking whether basic_socket should NOT model the http::ServerSocket concept. I understood the naming convention, and the decision to provide the implementation as a configurable template. The problem is the lack of composability. If a different http::Socket concept is desired (someone not using ASIO, etc.), then the http::ServerSocket concept has to be re-implemented also since there is no other implementation. The obvious way is to achieve composability is to use inheritance with: `http::basic_server_socket<Socket>` where `Socket` is a http::Socket concept. Inheritance in this situation has its drawbacks, for sure (a virtual destructor should be considered). > I think standalone functions for typical client and server operations can >> be implemented as "composed" operations similar to `asio::async_write`. The >> documentation will have to be explicit on what the composed function is >> doing so that users know whether the Socket concept has outstanding reads >> or writes (and therefore cannot do certain operations until the handler is >> invoked). In fact, if there is a server operation that _cannot_ be done >> with the Socket concept, then the concept probably needs to be re-designed. >> > > About "users know whether..." seems like a bad idea if I want to deliver > multiple backends. Some implementation details should just be abstracted > away. > > http::SocketServer implementations manipulate the state of the http::Socket (and indirectly the asio::tcp::socket), making some actions unavailable after invoking those functions. For example, after invoking `async_write_response`, no writes on the http::Socket/http::ServerSocket or asio::ip::tcp::socket can occur until the callback is invoked because it calls asio::write on the asio::ip::tcp::socket directly. So unless I am incorrect, it is important for the users to know whats being manipulated (the effects). I don't understand what you mean by "if there is a server operation that > cannot be done with the Socket concept [...]". Boost.Http has two concepts, > ServerSocket and Socket. Socket concept will be useful to client-side HTTP > and that's the reason why there are two concepts. > > The http::ServerSocket concept requires a http::Socket to write its messages, but does the http::ServerSocket concept need to be a refinement of the http::Socket concept? This implies a strong relationship. The current specification looks like a http::ServerTraits concept - its specifying how a http::Socket is being used in situations specific to servers. There doesn't appear to be any additional state tracking needed for the http::ServerSocket functions, which is why I suggested standalone functions (I didn't see the FileServer section). In fact implementation can be inverted; make all of the current implementations for http::ServerSocket standalone functions, and then have the default http::ServerTraits implementation call the standalone versions of the functions. The http::ServerTraits should then take a http::Socket as an argument for each of the functions. This complete de-coupling would allow someone to independently change the behavior of any related server functions, even while using the same http::Socket object. [1] https://boostgsoc14.github.io/boost.http/reference/write_state.html > [2] "The ServerSocket object MUST prevent the user from issuing new > replies while [...]", > https://boostgsoc14.github.io/boost.http/reference/server_socket_concept.ht… > > Lee

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[Utility] intuitive scoping with BOOST_WITH
by Marcel Ebmer 08 Aug '15

08 Aug '15

Hi Everyone, What if you could do std::mutex the_mutex; using Lock = std::unique_lock<std::mutex>; void f() { with(Lock{the_mutex}) { do_something(); do_other_thing(); } } *...or...* struct Pushed_matrix { Pushed_matrix() { glPushMatrix(); } ~Pushed_matrix() { glPopMatrix(); } }; void f() { with(Pushed_matrix{}) draw_something(); } At C++Now (2015), I presented this idea of mine and a macro implementation (BOOST_WITH) in a lightning talk. Since reception was good and more serious than the talk itself, I continued to work on it. I would appreciate informal review and opinions: https://github.com/maysl/BOOST_WITH Marcel

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1.59.0 rc2 is now available
by Marshall Clow 08 Aug '15

08 Aug '15

Release candidate files for 1.59.0 are available at: http://boost.cowic.de/rc/ (rc1 failed a smoke test) As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. The files (and associated md5s) are: MD5 (boost_1_59_0_rc2.7z) = 1854999b8d32ba89acbf4384fe55e0ab MD5 (boost_1_59_0_rc2.tar.bz2) = 1783f07dd4736ffd9fc97874ce4ef4bf MD5 (boost_1_59_0_rc2.tar.gz) = 47e6db09fd7e1265b9b7046f654e9a72 MD5 (boost_1_59_0_rc2.zip) = 9061c5bbc3399f3f220036e896c202aa Thanks! -- The release managers P.S. Release notes are here: http://www.boost.org/users/history/version_1_59_0.html

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[1.59] Still unmerged changes in the super-project
by John Maddock 08 Aug '15

08 Aug '15

There are a number of unmerged changes in develop of the super-project that look like they should really be in release, in particular: * Jamroot, contains amongst other things a very old fix for Oracle C++ support, without which building with Oracle is more or less broken. In fact unmerged commits on this file go back to....wait for it... 2011 ! * bootstrap.bat has fixes for some rather embarrassing typos. * bootstrap.sh has lots of fixes, also going back to 2011. Those were the "highlights" that stood out to me, the full list with unmerged changes is: .gitmodules | 613 ++++++++++++++++++------------------ .travis.yml | 6 +- Jamroot | 32 +- boostcpp.jam | 47 +-- boostcpp.py | 459 --------------------------- bootstrap.bat | 4 +- bootstrap.sh | 24 +- doc/Jamfile.v2 | 2 - doc/src/boost.xml | 2 - libs/libraries.htm | 10 +- libs/maintainers.txt | 5 +- status/Jamfile.v2 | 4 - status/explicit-failures-markup.xml | 41 +-- tools/Jamfile.v2 | 2 +- 14 files changed, 336 insertions(+), 915 deletions Best, John.

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[iostreams] Ticket #5237 - Chance to get fix applied into Boost 1.59?
by Deniz Bahadir 08 Aug '15

08 Aug '15

Hi everyone, in our application we use Boost.Iostreams with GZip functionality to write some data into gzipped output-files. Eventually we realized, that we would get corrupted output-files if no data was available that could be written to the output-file By looking for a patch we stumbled across an issue-report [1] which seems to be open for more than 4 years, although a simple fix was already provided in its comments 3,5 years ago. My question is: Can somebody apply that fix to the development branch and could it still make it into the upcoming Boost 1.59 release? Thanks, Deniz [1] https://svn.boost.org/trac/boost/ticket/5237

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Getting started with Boost
by Prathamesh Dahale 08 Aug '15

08 Aug '15

Hello, I am Prathamesh Dahale, third year computer engineering student. I am interested in contributing to Boost through gsoc 2016. I know c and c++, I am familiar with c++ STL and I have very good programming skills. I participate in many online programming contests. my handle on codechef.com is 'miracle003'. I would like to utilize my skills for contributing to Boost and I am interested in doing some project with Boost in gsoc 2016. from where i should start?

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Re: [boost] [asio-users] [http] Formal review of Boost.Http
by Lee Clagett 08 Aug '15

08 Aug '15

Sorry for any duplicates and top posting, but I didn't reply-all, so boost got dropped (which was probably more important). And this likely ruins some mail clients (again sorry!). On Fri, Aug 7, 2015 at 11:10 PM, Lee Clagett <forum(a)leeclagett.com> wrote: > On Fri, Aug 7, 2015 at 6:29 PM, Vinícius dos Santos Oliveira < > vinipsmaker(a)users.sf.net> wrote: > >> 2015-08-07 12:53 GMT-03:00 Niall Douglas <s_sourceforge(a)nedprod.com>: >> >>> I do not believe Http is ready for peer review for these reasons, and >>> I personally would urge you withdraw it until you have fixed these >>> issues and then come back to us. If you do not withdraw it, I will >>> vote for rejection. >>> >> ...[large snip]... >> > >>> * I don't understand why you cannot issue more than one async read at >>> a time nor async write at a time. In something like pipelined HTTP >>> that seems like a very common pattern. I smell a potential design >>> flaw, and while the docs mention a "queue_socket" I can't see such a >>> thing in the reference section. >>> >> >> Too much synchronization and buffering. >> >> The pipeline has the following requests: >> >> A => B => C >> >> If I were to allow replies to request B, the design would be more >> complex, increasing the difficult to implement alternative backends and >> everyone's life. Also, the reply to request B cannot actually be sent while >> the reply to request A is on hold. This means that the whole response to >> request B would need buffering and if response B is a video live stream, >> this means an implicit (the user cannot know) crash after an unfortunate >> memory exhaustion. I couldn't claim a **lightweight** server if this >> excessive buffering was to occur. I couldn't claim the project is >> appropriate for embedded devices if I had chosen the buffering approach. >> It's a trade-off. I should write about it in the "design choice" of the >> documentation. >> >> HTTP/2.0 does have proper multiplexing and it can be more useful to >> respond several requests without "head of line blocking". >> >> A queue socket is a concept, I don't provide one. I can look into how >> make the documentation less confusing by adding a page exclusively >> dedicated to explain the problem it solves. Would that work for you? >> >> > FWIW it should be possible to do client and server side pipelining with > this design right now. The reads and writes of the HTTP Socket concept > should be (and currently are by `basic_socket`) handled independently. > Since the notification for a write completion is based on the lower layer > write completion, and NOT whether a HTTP response was received, multiple > (pipelined) requests should be possible by a client. Similarly, this design > should allow servers to handle pipelined requests in parrallel. Providing a > framework for client or server pipelining will require more work, and > should probably not be a part of the Socket concept. In fact - > > I think the ServerSocket concept should be removed entirely. The > `http::basic_socket<...>` models both concepts, so theres lots of server > specific code in it, which seems confusing to me (is this really a "basic" > socket?). I think standalone functions for typical client and server > operations can be implemented as "composed" operations similar to > `asio::async_write`. The documentation will have to be explicit on what the > composed function is doing so that users know whether the Socket concept > has outstanding reads or writes (and therefore cannot do certain operations > until the handler is invoked). In fact, if there is a server operation that > _cannot_ be done with the Socket concept, then the concept probably needs > to be re-designed. > > Lee >

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