[C++-sig] Compiling boost python

[Axel Huebl]

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 Knüppel <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 Knüppel <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
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-- 
Sent from my smartphone.
Please excuse my brevity.
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