[C++-sig] Compiling boost python

Fri May 1 04:39:40 EDT 2020

We build boost-python using a simple setup:
1. build boost according to its own instructions
2. cmake to build our C++, using find_package for python and boost libraries
we use the latest cmake, find_package with exact required components

I personally found bjam tricky to use (very few examples or search results
for problems), whereas cmake/gnumake are standard and widely used.

Lewis

Bayforest Technologies Limited
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On Thu, Apr 30, 2020 at 10:27 PM <cplusplus-sig-request at python.org> wrote:

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>    1. Re: Compiling boost python (Axel Huebl)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 30 Apr 2020 14:21:40 -0700
> From: Axel Huebl <a.huebl at hzdr.de>
> To: Development of Python/C++ integration <cplusplus-sig at python.org>
> Subject: Re: [C++-sig] Compiling boost python
> Message-ID: <6C53894D-D06A-4F18-AE8E-0C479DA9B201 at hzdr.de>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
>
> Check out the bazel example or the plain build with setuptools:
>
> https://github.com/pybind/
> https://github.com/pybind/python_example
>
> Axel
>
> On April 30, 2020 9:05:39 AM PDT, Andrew Voelkel <
> jandyman.voelkel at gmail.com> wrote:
> >The examples all use cmake, and there is a cmake extension for pybind11
> >that takes care of a number of things for you. From the docs:
> >
> >For C++ codebases that have an existing CMake-based build system, a
> >Python extension module can be created with just a few lines of code:
> >cmake_minimum_required(VERSION 2.8.12)
> >project(example)
> >
> >add_subdirectory(pybind11)
> >pybind11_add_module(example example.cpp)
> >
> >More here:
> >
> >
> https://pybind11.readthedocs.io/en/stable/compiling.html#building-with-cmake
> >
> >
> >From: Cplusplus-sig
> ><cplusplus-sig-bounces+jandyman.voelkel=gmail.com at python.org> on behalf
> >of Alain O' Miniussi <alain.miniussi at oca.eu>
> >Reply-To: Development of Python/C++ integration
> ><cplusplus-sig at python.org>
> >Date: Thursday, April 30, 2020 at 8:30 AM
> >To: Development of Python/C++ integration <cplusplus-sig at python.org>
> >Subject: Re: [C++-sig] Compiling boost python
> >
> >But having one more lib outside boost means one more dependency.
> >
> >The sad thing is that dropping support for "the oldest and buggiest of
> >compiler specimens" in Boost would be rational to do, there are plenty
> >of old Boost releases for those.
> >How the cmake support for pybind ?
> >
> >----- On 29 Avr 20, at 20:09, Andrew Voelkel
> ><jandyman.voelkel at gmail.com> wrote:
> >
> >This blurb might help with that question:
> >
> >The main issue with Boost.Python?and the reason for creating such a
> >similar project?is Boost. Boost is an enormously large and complex
> >suite of utility libraries that works with almost every C++ compiler in
> >existence. This compatibility has its cost: arcane template tricks and
> >workarounds are necessary to support the oldest and buggiest of
> >compiler specimens. Now that C++11-compatible compilers are widely
> >available, this heavy machinery has become an excessively large and
> >unnecessary dependency. Think of this library as a tiny self-contained
> >version of Boost.Python with everything stripped away that isn?t
> >relevant for binding generation. Without comments, the core header
> >files only require ~4K lines of code and depend on Python (2.7 or 3.x,
> >or PyPy2.7 >= 5.7) and the C++ standard library. This compact
> >implementation was possible thanks to some of the new C++11 language
> >features (specifically: tuples, lambda functions and variadic
> >templates). Since its creation, this library has grown beyond
> >Boost.Python in many ways, leading to dramatically simpler binding code
> >in many common situations.
> >
> >
> >  *   Andy
> >
> >From: Cplusplus-sig
> ><cplusplus-sig-bounces+jandyman.voelkel=gmail.com at python.org> on behalf
> >of Torsten Kn?ppel <brumfessor at gmx.net>
> >Reply-To: Development of Python/C++ integration
> ><cplusplus-sig at python.org>
> >Date: Wednesday, April 29, 2020 at 8:15 AM
> >To: Development of Python/C++ integration <cplusplus-sig at python.org>
> >Subject: Re: [C++-sig] Re: Compiling boost python
> >
> >Hi Andy,
> >
> >thanks for the quick reply. I only came across pybind recently when I
> >was encountering some dependency issues with
> >boost.python<http://boost.python> and looked for an alternative. It
> >looks really useful, but I hesitated to make the switch - but I think I
> >will do it sooner or later. Maybe one question regarding pybind - is it
> >easy to create bindings for different Python versions?
> >Am 29.04.20, 16:42 schrieb Andrew Voelkel <jandyman.voelkel at gmail.com>:
> >Have you considered using pybind11? It?s the same basic idea as
> >boost.python, but it is cleaner, much better supported and documented,
> >and has a large user community. I just discovered this lately, have
> >been using it, and I?m thrilled with it. The only catch is that you
> >need to be compiling with at least a C++11 compiler, but that is a
> >pretty low bar these days.
> >
> >
> >  *   Andy
> >
> >From: Cplusplus-sig
> ><cplusplus-sig-bounces+jandyman.voelkel=gmail.com at python.org> on behalf
> >of Torsten Kn?ppel <brumfessor at gmx.net>
> >Reply-To: Development of Python/C++ integration
> ><cplusplus-sig at python.org>
> >Date: Wednesday, April 29, 2020 at 7:34 AM
> >To: "cplusplus-sig at python.org" <cplusplus-sig at python.org>
> >Subject: [C++-sig] Compiling boost python
> >
> >Dear all,
> >
> >I'm trying to compile boost.python with a version of python, that I've
> >downloaded and built myself.
> >Is the "No-install quickstart"-page
> >(
> https://www.boost.org/doc/libs/1_73_0/libs/python/doc/html/building/no_install_quickstart.html
> )
> >still updated, because some of the links are broken and
> >I honestly don't understand what is going on there.
> >Some questions that I have:
> >- What is the bjam "build driver"? When I go to Section 5 of the boost
> >Getting Started page - they mention something about an easy install
> >option and another one for custom binaries.
> >  The entire page mentions neither bjam, nor "build driver".
> >- I manage to build boost, by first running the bootstrap script and
> >then calling b2 - if I select e.g. graph - it is built and copied into
> >the correct directory, that I've specified. However,
> >   it doesn't work with my own Python folder.
> >  I wrote a small script to automate all steps:
> >
> >#wget
> >https://dl.bintray.com/boostorg/release/1.73.0/source/boost_1_73_0.tar.gz
> >#tar -xvf boost_1_73_0.tar.gz
> >cd boost_1_73_0
> >./bootstrap.sh --prefix=../build_boost --with-libraries=python
> >-with-python-root=../Python-3.6.10 --with-python-version=3.6
> >./b2 install -d+2
> >echo "using python : : ../Python-3.6.10/python ;" > user-config.jam
> >
> >My folder structure is as follows:
> >
> >buildBoost.sh (the script above)
> >/Python-3.6.10 (contains the python source code and binaries that I've
> >build myself)
> >     /boost_1_73_0 (boost source code as downloaded by the script)
> >     /build_boost (output folder as specified by prefix)
> >
> >When do I need to write this user-config.jam file? What are the
> >compilation scripts looking for - can this process be debugged?
> >I also have boost installed via apt - now I think that everytime I call
> >b2 or bjam it uses
> >the global versions of these programs, instead of the ones contained in
> >the boost-directory I'm compiling - is that an issue?
> >
> >Thanks in advance.
> >torsten
> >_______________________________________________ Cplusplus-sig mailing
> >list Cplusplus-sig at python.org
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> >
> >_______________________________________________
> >Cplusplus-sig mailing list
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>
> --
> Sent from my smartphone.
> Please excuse my brevity.
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