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

Re: [boost] [Boost-users] Need help with errors while building boost for clang on android NDK
by Robert Dailey 04 Oct '16

04 Oct '16

On Wed, Sep 28, 2016 at 10:49 AM, Robert Dailey <rcdailey.lists(a)gmail.com> wrote: > On Mon, Sep 26, 2016 at 11:55 AM, Robert Dailey > <rcdailey.lists(a)gmail.com> wrote: >> On Mon, Sep 26, 2016 at 11:09 AM, Oliver Kowalke >> <oliver.kowalke(a)gmail.com> wrote: >>> 2016-09-26 17:57 GMT+02:00 Robert Dailey <rcdailey.lists(a)gmail.com>: >>>> >>>> >> > 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 >>>> > >>>> > >>>> > you try to build for i386 instead arm >>>> >>>> How can I make it use arm instead? >>> >>> >>> I assume you try to cross compile : >>> http://www.boost.org/doc/libs/1_61_0/libs/context/doc/html/context/architec… >> >> I am indeed trying to cross compile, however I am not familiar with b2 >> nor do I much care to learn it (since it's a means to an end for me to >> build boost). >> >> Can you provide an example of how I can specify the documented >> settings to b2 for my build? Do I provide the values to those in my >> project-config file? > > Would really love help with this guys. I literally can't find info on > this anywhere else. Surely someone has had success getting 1.61 > building with NDK + ARM + Clang. > > I made a best-guess using the context cross compiling settings linked > earlier. Does this seem correct? It doesn't build at the moment saying > it can't find locale-related symbols. That doesn't help me at all so I > guess I'm going to have to dig into the llvm STL code and find out > what preprocessor flags I'm missing (assuming it's that simple). Also > I still don't know how to specify 'ar' and 'ranlib' executables to > boost from NDK. > > > 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 > <architecture>arm > <address-model>32 > <binary-format>pe > <abi>aapcs > ; FYI: I still haven't gotten this working. Sorry to keep bumping this thread but I have absolutely zero options yet. I need help from the boost developers at this point, I think.

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[concept_check] convert Concept to trait?
by Vinnie Falco 04 Oct '16

04 Oct '16

I don't see a place to open issues on https://github.com/boostorg/concept_check so I am posting this here. What I want to do is convert a concept into a trait. For example, given the ForwardIterator concept checking class, I would like to write: template<T> using is_ForwardIterator = std::integral_constant<bool, ...>; Which aliases to std::true_type if T meets the requirements of ForwardIterator and false otherwise. Or perhaps a general purpose alias: template<t> using is_concept<T, C> = std::integral_constant<bool, ...>;l Which aliases to std::true_type if T meets the requirements of concept C. Are such things possible, or perhaps already in the library? My preliminary analysis suggests the answers to these questions are no and no. Has this point been brought up elsewhere, and if so where could I find it? Regards

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preparation for Gsoc 2017
by Prashant Kumar 04 Oct '16

04 Oct '16

Hello Boost community, I need some help for preparing effectively for Gsoc 17 with Boost community. I have been through the boost gsoc webpage and for getting selected in Gsoc an aspirant need to provide competency Test. I want to know that apart from competency test what other projects would be helpful in making my proposal strong. Should I be writting more programs using boost library ? , should I be aware of all boost libraries ?. I want your suggestions as I'm very serious regarding the matter. thanks!! and sorry if the question is quite nooby.

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How to build Boost with VS15
by Olaf van der Spek 04 Oct '16

04 Oct '16

Hi, How does one build Boost (1.62) with VS15 (Preview 4)? I know it's not officially supported.. C:\VC\boost>bootstrap.bat Building Boost.Build engine 'cl' is not recognized as an internal or external command, operable program or batch file. Failed to build Boost.Build engine. Please consult bootstrap.log for further diagnostics. -- Olaf

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Review Request: Synapse
by Emil Dotchevski 03 Oct '16

03 Oct '16

I'm requesting a formal review for the Synapse library. Edward Diener has kindly offered to serve as the review manager for Synapse. Synapse is a signal programming library, similar to Boost Signals2 and the signals-slots system in Qt. The main difference is that Synapse is non-intrusive: the address of any object of any static type whatsoever can be passed to synapse::emit to emit a signal. This makes it possible to emit Synapse signals from objects of third-party types as well as system objects (e.g. standard FILE pointers, HWNDs, etc.) or any other object that can be converted to a pointer. The library has been formatted to fit the Boost directory and namespace structure. To get Synapse, clone https://github.com/zajo/boost-synapse.git into a directory called synapse under your boost/libs directory. See the tutorial at http://zajo.github.io/boost-synapse/Tutorial.html, or read full documentation at http://zajo.github.io/boost-synapse/index.html. Thanks, Emil

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CMake Modularization
by Philip Woods 03 Oct '16

03 Oct '16

CMake is a widely used build system and has become for many the de facto standard. Boost is a widely used collection of modules and has become for many part of the de facto standard. However, the two do not play very well together. I know there is another port of boost to CMake, but it has lain dormant for years and uses an old version of boost; plus I chose to take a different route. The old project attempted to completely replace Boost.Build with CMake. My example port simply allows people to more easily use boost modules in their projects. I created an example project https://github.com/Elzair/cmake-boost-filesystem-test to demonstrate my ideas. I added CMake build support to the minimum number of modules needed to support this demo: https://github.com/Elzair/assert https://github.com/Elzair/config https://github.com/Elzair/core https://github.com/Elzair/filesystem/tree/master and https://github.com/Elzair/system I even added CMake build support to the header only boost libraries. I did this for two reasons. First, I did not want users to have to fool with CMake's find_package(). Second, I wanted to add helpful error messages in case a user has not included all of a module's dependencies (or added them in the wrong order). Would the community be interested in modular CMake support for more modules? Any comments, questions, critiques or suggestions are welcome.

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