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<body lang="EN-US" link="blue" vlink="purple">Hi,<br><br>Check out the bazel example or the plain build with setuptools:<br><br><a href="https://github.com/pybind/">https://github.com/pybind/</a><br><a href="https://github.com/pybind/python_example">https://github.com/pybind/python_example</a><br><br>Axel<br><br><div class="gmail_quote">On April 30, 2020 9:05:39 AM PDT, Andrew Voelkel <jandyman.voelkel@gmail.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="WordSection1">
<p class="MsoNormal">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:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:.25in;margin-left:.5in;line-height:18.0pt">
<span style="color:#404040">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:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;background:#F8F8F8"><span style="color:green">cmake_minimum_required</span><span style="color:#404040">(</span><span style="color:#BA2121">VERSION</span><span style="color:#404040">
</span><span style="color:#BA2121">2.8.12</span><span style="color:#404040">)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;background:#F8F8F8"><span style="color:green">project</span><span style="color:#404040">(</span><span style="color:#BA2121">example</span><span style="color:#404040">)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;background:#F8F8F8"><span style="color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;background:#F8F8F8"><span style="color:green">add_subdirectory</span><span style="color:#404040">(</span><span style="color:#BA2121">pybind11</span><span style="color:#404040">)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;background:#F8F8F8"><span style="color:green">pybind11_add_module</span><span style="color:#404040">(</span><span style="color:#BA2121">example</span><span style="color:#404040">
</span><span style="color:#BA2121">example.cpp</span><span style="color:#404040">)<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">More here:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://pybind11.readthedocs.io/en/stable/compiling.html#building-with-cmake">https://pybind11.readthedocs.io/en/stable/compiling.html#building-with-cmake</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Cplusplus-sig <cplusplus-sig-bounces+jandyman.voelkel=gmail.com@python.org> on behalf of Alain O' Miniussi <alain.miniussi@oca.eu><br>
<b>Reply-To: </b>Development of Python/C++ integration <cplusplus-sig@python.org><br>
<b>Date: </b>Thursday, April 30, 2020 at 8:30 AM<br>
<b>To: </b>Development of Python/C++ integration <cplusplus-sig@python.org><br>
<b>Subject: </b>Re: [C++-sig] Compiling boost python<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">But having one more lib outside boost means one more dependency.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">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.</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#404040;background:#FCFCFC">
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">How the cmake support for pybind ?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
----- On 29 Avr 20, at 20:09, Andrew Voelkel <jandyman.voelkel@gmail.com> wrote:<br>
<br>
<o:p></o:p></span></p>
</div>
<div>
<blockquote style="border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span style="color:black">This blurb might help with that question:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:#404040;background:#FCFCFC">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 </span><span style="font-size:12.0pt;color:#404040;background:yellow">Python (2.7 or 3.x, or PyPy2.7 >= 5.7)</span><span style="font-size:12.0pt;color:#404040;background:#FCFCFC"> 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.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l1 level1 lfo1">
Andy<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Cplusplus-sig <cplusplus-sig-bounces+jandyman.voelkel=gmail.com@python.org> on behalf of Torsten Knüppel <brumfessor@gmx.net><br>
<b>Reply-To: </b>Development of Python/C++ integration <cplusplus-sig@python.org><br>
<b>Date: </b>Wednesday, April 29, 2020 at 8:15 AM<br>
<b>To: </b>Development of Python/C++ integration <cplusplus-sig@python.org><br>
<b>Subject: </b>Re: [C++-sig] Re: Compiling boost python</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black">Hi Andy,<br>
<br>
thanks for the quick reply. I only came across pybind recently when I was encountering some dependency issues with
<a href="http://boost.python" target="_blank">boost.python</a> 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?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black">Am 29.04.20, 16:42 schrieb Andrew Voelkel <jandyman.voelkel@gmail.com>:
<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:4.8pt;margin-right:0in;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span style="color:black">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l0 level1 lfo2">
Andy<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Cplusplus-sig <cplusplus-sig-bounces+jandyman.voelkel=gmail.com@python.org> on behalf of Torsten Knüppel <brumfessor@gmx.net><br>
<b>Reply-To: </b>Development of Python/C++ integration <cplusplus-sig@python.org><br>
<b>Date: </b>Wednesday, April 29, 2020 at 7:34 AM<br>
<b>To: </b>"cplusplus-sig@python.org" <cplusplus-sig@python.org><br>
<b>Subject: </b>[C++-sig] Compiling boost python</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">Dear all,</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">I'm trying to compile boost.python with a version of python, that I've downloaded and built myself.</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">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</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">I honestly don't understand what is going on there.</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">Some questions that I have:</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> - 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.</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> The entire page mentions neither bjam, nor "build driver".</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> - 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,</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> it doesn't work with my own Python folder.</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> I wrote a small script to automate all steps:
</span><span style="color:black"><o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">#wget https://dl.bintray.com/boostorg/release/1.73.0/source/boost_1_73_0.tar.gz<br>
#tar -xvf boost_1_73_0.tar.gz<br>
cd boost_1_73_0<br>
./bootstrap.sh --prefix=../build_boost --with-libraries=python -with-python-root=../Python-3.6.10 --with-python-version=3.6 <br>
./b2 install -d+2<br>
echo "using python : : ../Python-3.6.10/python ;" > user-config.jam</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">My folder structure is as follows:</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">buildBoost.sh (the script above)</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> /Python-3.6.10 (contains the python source code and binaries that I've build myself)</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> /boost_1_73_0 (boost source code as downloaded by the script)</span><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> /build_boost (output folder as specified by prefix) </span><span style="color:black"><o:p></o:p></span></p>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">When do I need to write this user-config.jam file? What are the compilation scripts looking for - can this process be debugged?</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">I also have boost installed via apt - now I think that everytime I call b2 or bjam it uses</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">the global versions of these programs, instead of the ones contained in the boost-directory I'm compiling - is that an issue?</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">Thanks in advance.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:black">torsten</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">_______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Helvetica;color:black"><br>
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</blockquote></div><br>-- <br>Sent from my smartphone.<br>Please excuse my brevity.</body></html>