[C++-sig] Compiling boost python

[Alain O' Miniussi]

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 [ http://boost.python/ | 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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