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September 2020

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Boost Python Wrong Python Version macOS
by Mortimer Hemmit Sept. 11, 2020

Sept. 11, 2020

Hello, I am trying to build the Python library for Boost 1.74.0 on macOS Catalina 10.15.8 with the default Clang 11.0.3. I also installed Python 3.7.9 from python.org I am following the instructions located at <https://www.boost.org/doc/libs/1_74_0/more/getting_started/unix-variants.ht…> and <https://www.boost.org/doc/libs/1_74_0/libs/python/doc/html/building/install…> I untar the archive and then execute this command in the boost directory: ./bootstrap.sh --with-python=python3.7 --with-libraries=python This gives me output saying that it detected python 3.7. *****BEGIN OUTPUT***** Building Boost.Build engine with toolset clang... tools/build/src/engine/b2 Detecting Python version... 3.7 Detecting Python root... /Library/Frameworks/Python.framework/Versions/3.7 Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in project-config.jam.1 Generating Boost.Build configuration in project-config.jam for clang... Bootstrapping is done. To build, run: ./b2 To generate header files, run: ./b2 headers To adjust configuration, edit 'project-config.jam'. Further information: - Command line help: ./b2 --help - Getting started guide: http://www.boost.org/more/getting_started/unix-variants.html - Boost.Build documentation: http://www.boost.org/build/ *****END OUTPUT***** Then, I run sudo ./b2 --with-python However, when it builds the libraries, it saves it with a folder path that has 2.7, and I get files such as libboost_python27.dylib. *****BEGIN OUTPUT***** In file included from /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include/numpy/ufuncobject.h:327: *****END OUTPUT***** /System/Library is where the default macOS Python 2.7 is stored. How can I convince Boost to use the Python 3.7 that I installed, instead of the default Python 2.7? It looked like it detected it in bootstrap, but it doesn't use it later. Is the way that I specified the desired python executable correct? Any help or guidance is greatly appreciated. Thank you, Mortimer

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compiler error during boost.python tutorial (exposing class World), wrong number of template arguments
by ckim＠etri.re.kr Sept. 9, 2020

Sept. 9, 2020

Hello all, I was following the boost.python tutorial but have this compile error that I don't know how to solve. The compiler says I need 4 template parameters for the class exposing class_ definition, but I only have one. (the other three are optional, aren't they?) BOOST_PYTHON_MODULE(world_ext) { using namespace boost::python; class_<World>("World") .def("greet", &World::greet) .def("set", &World::set) ; } I have asked the question on https://stackoverflow.com/questions/63803975/compile-error-during-boost-pyth on-tutorial-error-wrong-number-of-template-argu. If someone please tell me how to fix it, I would deeply appreciate it. Thank you. BTW, the tutorial is so old and doesn't fit with current boost code, and even the build method is different from the tutorial. For beginners to boost.python, it will take unnecessarily long to catch things. Chan Kim, Principal Research Member Processor Research Team, Intelligent Semiconductor Research ETRI(Electronics and Telecommunications Research Institute) O) +82-42-860-5773 C) +82-10-3418-9152 E) <mailto:ckim@etri.re.kr> ckim(a)etri.re.kr

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