Mailman 3 May 2019 - Cplusplus-sig

Re: [C++-sig] "cmake can't find boost python (Paddy Finn)"
by Lewis Evans May 23, 2019

May 23, 2019

We use cmake and build C++ against boost-python (boost 1.70.0, python 3.7). We set the envvar "BOOST_ROOT" to the correct folder; Include files are in folder %BOOST_ROOT%\boost Libraries are in %BOOST_ROOT%\libs. Once you've done that, cmake's command find_package(Boost REQUIRED_COMPONENTS date_time ... python) should succeed (we check the cmake flag variable Boost_FOUND after the call to find_package). To verify that your original build of boost completed as intended, you can check what's in the directory BOOST_ROOT/lib, eg does that folder contain libboost_python.* with various endings (eg .a, .so for linux)? Also the version of python you have in BOOST_ROOT/lib should match the one that you get from typing "python" at the command prompt. Hope that helps Lewis Bayforest Technologies Limited 16 Berkeley Street London, W1J 8DZ work1: +44 203 907 3883 (dial-in for UK) work2: +1 347 746 0976 (dial-in for US) email: lewis.evans(a)bayforest.ai web: https://bayforest.ai/ On Tue, May 21, 2019 at 1:32 PM <cplusplus-sig-request(a)python.org> wrote: > Send Cplusplus-sig mailing list submissions to > cplusplus-sig(a)python.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.python.org/mailman/listinfo/cplusplus-sig > or, via email, send a message with subject or body 'help' to > cplusplus-sig-request(a)python.org > > You can reach the person managing the list at > cplusplus-sig-owner(a)python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Cplusplus-sig digest..." > > > Today's Topics: > > 1. Re: Python support in boost::python (what version) > (Stefan Seefeld) > 2. openexr can't find boost python (Patrick Finn) > 3. cmake can't find boost python (Paddy Finn) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 20 May 2019 12:15:43 -0400 > From: Stefan Seefeld <stefan(a)seefeld.name> > To: cplusplus-sig(a)python.org > Subject: Re: [C++-sig] Python support in boost::python (what version) > Message-ID: <3ed4671b-943c-fcbf-9342-aa049459c8f8(a)seefeld.name> > Content-Type: text/plain; charset="windows-1252"; Format="flowed" > > > On 2019-05-20 11:20 a.m., Jones, Torrin A (US) wrote: > > > > For clarity, my boss is asking, ?what version of python does boost > > python support??? I was hoping there was some kind of table or > > something, but I guess the answer is something like, ?It supports > > whatever version of python was out at the time that boost python was > > released?? And then we can go back and look at release dates.? LOL. > > > What did you expect ? It's obvious that a given release of Boost.Python > can not make any compatibility guarantees about future Python releases, > unless, of course, Python itself promises to be fully backward > compatible. That's precisely why the versioning scheme used by Python > supports the distinction between "major" and "minor" version, to be able > to make statements as to what degree of backward-compatibility to expect. > > > Ex: boost python 1.66.0 was released/tagged on Nov 17, 2017.? Python > > 3.6.3 was released on Oct 3, 2017.? Python 3.6.4 was released on Dec > > 19. 2017. So in theory boost python 1.66.0 has support for Python > > 3.6.3, but does not have support for Python 3.6.4.? I know that?s > > ludicrous but, I work in the corporate world so here we are. > > > What's your point, exactly ? What are you trying to do ? > > (For the specific case, I would *hope* that Boost.Python 1.66.0 was > compatible with Python 3.6.4, for the reason I cite above. But of > course, there is no guarantee. Boost is Free Software, and its license > (https://www.boost.org/users/license.html) clearly states that it is > provided "...without warranty of any kind...". So make of it what you > want.) > > Stefan > -- > > ...ich hab' noch einen Koffer in Berlin... > >

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Getting simple boost.python extension to work outside the test scripts - HELP!
by Andrew Voelkel May 22, 2019

May 22, 2019

Hi, I spent most of yesterday trying to get the simple tutorials and example to build from within the Boost example folders, and finally succeeded. It was not super straightforward as the instructions seem incomplete and out of date. But after finding a tutorial on Boost.Build and understanding how it works, I was able to debug the build process and get the test scripts to run successfully. Now I’d like to move to Spyder and run simple tests on the extension. However, when I try to execute a simple “import hello_ext” statement, I get an error trying to locate a dependent library. No amount of setting paths seem to help. (I copied libboost_python37.dylib to /Users/andy before running this script. I’m on Mac OS Mojave Commands: import os print(os.environ['PATH']) os.environ['PATH'] += ':/Users/andy' os.environ['DYLD_LIBRARY_PATH'] = '/Users/andy' print(os.environ['PATH']) print(os.environ['DYLD_LIBRARY_PATH']) import hello_ext Output: /Users/andy/anaconda3/bin:/Users/andy/anaconda3/condabin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin /Users/andy/anaconda3/bin:/Users/andy/anaconda3/condabin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/andy /Users/andy Traceback (most recent call last): File "", line 7, in import hello_ext ImportError: dlopen(/Users/andy/Dropbox (Personal)/Developer/boost_1_70_0/libs/python/example/tutorial/hello_ext.so, 2): Library not loaded: libboost_python37.dylib Referenced from: /Users/andy/Dropbox (Personal)/Developer/boost_1_70_0/libs/python/example/tutorial/hello_ext.so Reason: image not found What magic is the boost environment performing to make this work? What can I do to make my python extensions look for libboost_python37.dylib in the location where it lives? Thanks in advance for any help! * Andy

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Python support in boost::python (what version)
by Jones, Torrin A (US) May 22, 2019

May 22, 2019

What version of python does boost::python officially support? I noticed in the python build file (see link below), it will only find from version 1.5 to 3.4. Does this mean that boost python really only supports up to 3.4? Folks do appear to be using other versions, but the fact that this only goes to 3.4 leads me to believe that is as far as it's been tested. Is that right? What are the official versions? Is there any documentation that says that? https://github.com/boostorg/build/blob/develop/src/tools/python.jam#L401

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Boost.Python simple example won't build
by Andrew Voelkel May 20, 2019

May 20, 2019

Hello, I am new to Boost.Python and am trying to follow the Getting Started instructions here: https://www.boost.org/doc/libs/1_70_0/libs/python/doc/html/building/no_inst… The first step is to “get the bjam build driver” and I’m referred to section 5 of the generic Boost Getting Started Guide. But section 5 of the generic Getting Started guide doesn’t explain how to “get the bjam build driver”, or explain what the bjam driver is or how it works. So I followed all the instructions to build and install Boost itself under section 5 “Easy Build and Install” of the generic Boost Getting Started guide (https://www.boost.org/doc/libs/1_70_0/more/getting_started/unix-variants.ht…). But this also fails at the step “./b2 install”, apparently because include paths are not set up correctly. But there is no explanation of how to set up include paths, and after all I am not supposed to need a complete install anyway. And since I’m apparently using a build engine, rather than an existing makefile or such, I don’t know to configure the include paths, and I don’t know what they should be anyway. So I should back up. Is there a version of quickstart instructions that doesn’t refer you to another guide which doesn’t seem to explain what is needed anyway? How do I “Get the bjam build driver”. And what is it anyway? Won’t I need to know something about it to use Boost.Python? I don’t need any of Boost except for Boost.Python. Sorry for newbie question. I’m new to Boost, but I’m NOT a newbie programmer, so I’m probably some justified in being confused by the instructions. * Andy

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cmake can't find boost python
by Paddy Finn May 20, 2019

May 20, 2019

Hi, Please let me say at he outset, that I'm sure this is something daft that I'm doing wrong / not doing but this isn't my area of expertise. . . I've managed to build openexr and Ilmbase but am having trouble building pyilmbase that other projects need like alembic etc. I found an openexr build that has a single CMakeLIsts.txt to build the whole project so tried that instead and the only error that is popping up so far is an inability to find boost python. I think it's using find_package in a nested cmakeLists file and I I get: -- Could NOT find Boost CMake Warning at CMakeLists.txt:36 (message): Make boost Python available to CMake's search path, and re-run configuration CMake Error at CMakeLists.txt:37 (message): boost Python is a required dependency when OPENEXR_BUILD_PYTHON_LIBS is set I've tried building boost1.69.0 with bjam and it says succesfully built and gives me two directories to add as libs to other cmake commands. I've tried adding them both as a cmke include directory and as -DBoost_INCLUDE_DIRS / -DBoost_LIBRARY_DIRS but it still cant find boost python. I even tried to run a 'pip install boost' in case that the boost python was a separate install but it still didn't work. This is about where my knowledge level runs out and it's a bit blind trial and error for me at this stage. If anyone could offer any help it would be really appreciated! Thanks, Paddy

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openexr can't find boost python
by Patrick Finn May 20, 2019

May 20, 2019

Hi, I've managed to build openexr and Ilmbase but am having trouble building pyilmbase that other projects need like alembic etc. I found an openexr build that has a single CMakeLIsts.txt to build the whole project so tried that instead and the only error that is popping up so far is an inability to find boost python. I think it's using find_package in a nested cmakeLists file and I I get: -- Could NOT find Boost CMake Warning at CMakeLists.txt:36 (message): Make boost Python available to CMake's search path, and re-run configuration CMake Error at CMakeLists.txt:37 (message): boost Python is a required dependency when OPENEXR_BUILD_PYTHON_LIBS is set I've tried building boost1.69.0 with bjam and it says succesfully built and gives me two directories to add as libs to other cmake commands. I've tried adding them both as a cmke include directory and as -DBoost_INCLUDE_DIRS / -DBoost_LIBRARY_DIRS but it still cant find boost python. I even tried to run a 'pip install boost' in case that the boost python was a separate install but it still didn't work. This is about where my knowledge level runs out and it's a bit blind trial and error for me at this stage. If anyone could offer any help it would be really appreciated! Thanks, Paddy

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Re: [C++-sig] Cant Link Boost python example / Re: Cplusplus-sig Digest, Vol 118, Issue 1
by Lewis Evans May 17, 2019

May 17, 2019

Afternoon, We built boost 1.70.0 with python 3.7 just two days ago, and we also encountered the error about pyconfig.h. We resolved it with this env-var export of CPLUS_INCLUDE_PATH: export CPLUS_INCLUDE_PATH="$CPLUS_INCLUDE_PATH:/usr/local/miniconda/envs/python3/include/python3.7m/" (you will need to change the path to the location of your local install of python-anaconda) Bayforest Technologies Limited 16 Berkeley Street London, W1J 8DZ work1: +44 203 907 3883 (dial-in for UK) work2: +1 347 746 0976 (dial-in for US) email: lewis.evans(a)bayforest.ai web: https://bayforest.ai/ On Fri, May 17, 2019 at 2:18 PM <cplusplus-sig-request(a)python.org> wrote: > Send Cplusplus-sig mailing list submissions to > cplusplus-sig(a)python.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.python.org/mailman/listinfo/cplusplus-sig > or, via email, send a message with subject or body 'help' to > cplusplus-sig-request(a)python.org > > You can reach the person managing the list at > cplusplus-sig-owner(a)python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Cplusplus-sig digest..." > > > Today's Topics: > > 1. Python support in boost::python (what version) > (Jones, Torrin A (US)) > 2. Re: Python support in boost::python (what version) (stefan) > 3. Cant link Boost Python Examples (Jimmy Rizos) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 16 May 2019 19:43:30 +0000 > From: "Jones, Torrin A (US)" <torrin.jones(a)baesystems.com> > To: 'Development of Python/C++ integration' <cplusplus-sig(a)python.org> > Subject: [C++-sig] Python support in boost::python (what version) > Message-ID: <454hhW1T16zndqq(a)mail.python.org> > Content-Type: text/plain; charset="us-ascii" > > What version of python does boost::python officially support? I noticed > in the python build file (see link below), it will only find from version > 1.5 to 3.4. Does this mean that boost python really only supports up to > 3.4? Folks do appear to be using other versions, but the fact that this > only goes to 3.4 leads me to believe that is as far as it's been tested. > Is that right? > > What are the official versions? Is there any documentation that says that? > > https://github.com/boostorg/build/blob/develop/src/tools/python.jam#L401 >

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Cant link Boost Python Examples
by Jimmy Rizos May 16, 2019

May 16, 2019

Hello, As I am sure others have run into this problem, surprisingly there is very little actually describing a solution. I just built boost 1.70 yesterday but has still not been able to successfully build the tests. Below is the output I get. I cant find a boost_python library anywhere. I am using 32bit python 3.5 through anaconda. Any advice would be appreciated. Thanks C:\Development\boost_1_70_0\libs\python\example\quickstart> ..\..\..\..\b2.exe toolset=msvc link=shared --verbose-test test ...found 34 targets... ...updating 9 targets... msvc.link.dll extending.pyd LINK : fatal error LNK1181: cannot open input file 'boost_python.lib' call "..\bin\standalone\msvc\msvc-14.1\msvc-setup.bat" >nul link /NOLOGO /INCREMENTAL:NO /DLL /NOENTRY /DEBUG /MACHINE:X86 /MANIFEST /subsystem:console /out:"extending.pyd" /LIBPATH:"C:\Miniconda3\libs" @"extending.pyd.rsp" if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL% ...failed msvc.link.dll extending.pyd extending.pdb... ...skipped <p.>test_ext for lack of <p.>extending.pyd... compile-c-c++ embedding.obj embedding.cpp C:\Development\boost_1_70_0\boost/python/detail/wrap_python.hpp(57): fatal error C1083: Cannot open include file: 'pyconfig.h': No such file or directory call "..\bin\standalone\msvc\msvc-14.1\msvc-setup.bat" >nul cl /Zm800 -nologo @"embedding.obj.rsp" ...failed compile-c-c++ embedding.obj... ...skipped <p.>test_embed.exe for lack of <p.>embedding.obj... ...skipped <p.>test_embed.run for lack of <p.>test_embed.exe... ...failed updating 3 targets... ...skipped 5 targets... C:\Development\boost_1_70_0\libs\python\example\quickstart> Jimmy Rizos Managing Director, Chief Technology Officer [cid:image001.gif@01CC76C9.E6CF4870] 400 Capital Management LLC | 510 Madison Avenue | 17th Floor | New York, NY 10022 o 212.767.3136 | m 917.716.4108 | jimmy.rizos(a)400capital.com<mailto:jimmy.rizos@400capital.com> | www.400capital.com<http://www.400capital.com> This email, together with its attachments, if any, and the information contained therein is confidential and is intended solely for the recipient. Delivery of this email or any of the information contained herein to anyone other than the recipient or his designated representative is unauthorized and any other use, reproduction, distribution or copying of this email or the information contained herein, in whole or in part, without the prior written consent of 400 Capital Management LLC or its affiliates is prohibited. 400 Capital Management LLC accepts no liability for any errors or omissions arising as a result of this transmission. No assurances are given that this e-mail message and any attachments are free of viruses and/or other harmful code, and 400 Capital Management LLC accepts no liability for any damage sustained as a result of such viruses or harmful code. The contents of this e-mail message and any attachments should not be regarded as a solicitation or offer to buy or sell any securities. This email and the information contained herein shall not constitute an offer to sell or the solicitation of an offer to purchase an interest in a fund. Any such offer or solicitation will be made to qualified investors only by means of delivery of appropriate documentation, including without limitation, offering memoranda and related subscription agreement as applicable. Securities shall not be offered or sold in any jurisdiction in which such offer, solicitation or sale would be unlawful until the requirements of the laws of such jurisdiction have been satisfied. Any performance information contained herein may be unaudited and estimated. Past performance is not indicative of future results. If you have received this message in error, please notify the sender immediately and delete this message and any related attachments.

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