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building for Python 2 #4560

Closed
beroal opened this issue Apr 19, 2020 · 5 comments
Closed

building for Python 2 #4560

beroal opened this issue Apr 19, 2020 · 5 comments

Comments

@beroal
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beroal commented Apr 19, 2020

Please provide the following information

libtorrent version (or branch): 1.2.5 RC_1_2

platform/architecture: ArchLinux 5.6.4-arch1-1 #1 SMP PREEMPT Mon, 13 Apr 2020 12:21:19 +0000 x86_64 GNU/Linux

compiler and compiler version: g++ (Arch Linux 9.3.0-1) 9.3.0, cmake 3.17.1

I am trying to build the library with the Python binding for Python 2 with the following command.

  cmake \f
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX="/usr" \
    -DCMAKE_INSTALL_LIBDIR="lib" \
    -Dpython-bindings=ON \
    -Dboost-python-module-name="python-2.7" \
    "../libtorrent"
  make

Assigning python2 or python-2.7 to boost-python-module-name causes an error like this.

    libtorrent ... Skipped
Reset branch 'makepkg'
CMake Error at /usr/lib64/cmake/Boost-1.72.0/BoostConfig.cmake:120 (find_package):
  Could not find a package configuration file provided by "boost_python-2.7"
  (requested version 1.72.0) with any of the following names:

    boost_python-2.7Config.cmake
    boost_python-2.7-config.cmake

  Add the installation prefix of "boost_python-2.7" to CMAKE_PREFIX_PATH or
  set "boost_python-2.7_DIR" to a directory containing one of the above
  files.  If "boost_python-2.7" provides a separate development package or
  SDK, be sure it has been installed.
Call Stack (most recent call first):
  /usr/lib64/cmake/Boost-1.72.0/BoostConfig.cmake:185 (boost_find_component)
  /usr/share/cmake-3.17/Modules/FindBoost.cmake:444 (find_package)
  bindings/python/CMakeLists.txt:56 (find_package)


==> ERROR: A failure occurred in build().

Probably, I misunderstood bindings/python/CMakeLists.txt. If python is assigned to boost-python-module-name, import libtorrent in Python 2 fails with

ImportError: /usr/lib/libboost_python38.so.1.72.0: undefined symbol: PyUnicode_InternFromString
@wiserain
Copy link

You may want to try the module name as python27.

@beroal
Copy link
Author

beroal commented Apr 27, 2020

Now it builds the library, but for Python 3.8.

Building code:

  echo "Debug python version: $_boost"

  cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX="/usr" \
    -DCMAKE_INSTALL_LIBDIR="lib" \
    -Dpython-bindings=ON \
    -Dboost-python-module-name="$_boost" \
    "../libtorrent"
  make

Log:

Debug python version: python27
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc - works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ - works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Compiler default is C++14
-- Building in C++14 mode
-- Performing Test Iconv_IS_BUILT_IN
-- Performing Test Iconv_IS_BUILT_IN - Success
-- Found Iconv: /usr/lib/libc.so  
-- Found OpenSSL: /usr/lib/libcrypto.so (found version "1.1.1f")  
-- Found Boost: /usr/lib64/cmake/Boost-1.72.0/BoostConfig.cmake (found version "1.72.0") found components: system 
-- Found PythonInterp: /usr/bin/python (found version "3.8.2") 
-- Found PythonLibs: /usr/lib/libpython3.8.so (found version "3.8.2") 
-- Found Boost: /usr/lib64/cmake/Boost-1.72.0/BoostConfig.cmake (found version "1.72.0") found components: python27 
-- Performing Test _WNO_DEPRECATED_DECLARATIONS
-- Performing Test _WNO_DEPRECATED_DECLARATIONS - Success
-- Python site packages: lib/python3.8/site-packages
-- Python extension suffix: .cpython-38-x86_64-linux-gnu.so
-- The following features have been enabled:

 * BUILD_SHARED_LIBS, build libtorrent as a shared library
 * python-bindings, build python bindings
 * dht, enable support for Mainline DHT
 * deprecated-functions, enable deprecated functions for backwards compatibility
 * encryption, Enables encryption in libtorrent
 * exceptions, build with exception support
 * extensions, Enables protocol extensions
 * i2p, build with I2P support
 * logging, build with logging
 * mutable-torrents, Enables mutable torrent support
 * streaming, Enables support for piece deadline

-- The following RECOMMENDED packages have been found:

 * Iconv, GNU encoding conversion library, <https://www.gnu.org/software/libiconv/>
   Convert strings between various encodings
 * OpenSSL, Full-strength general purpose cryptography library, <https://www.openssl.org/>
   Provides HTTPS support to libtorrent

-- The following REQUIRED packages have been found:

 * Threads
 * boost_system (required version == 1.72.0)
 * PythonInterp
 * PythonLibs
 * boost_headers (required version == 1.72.0)
 * boost_python (required version == 1.72.0)
 * Boost

-- The following features have been disabled:

 * static_runtime, build libtorrent with static runtime
 * build_tests, build tests
 * build_examples, build examples
 * build_tools, build tools

-- Configuring done
-- Generating done
-- Build files have been written to: /var/abs/local/libtorrent-rasterbar-1_2-git/src/py2
Scanning dependencies of target torrent-rasterbar
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writing dependency_links to /var/abs/local/libtorrent-rasterbar-1_2-git/src/py2/bindings/python/libtorrent.egg-info/dependency_links.txt
writing top-level names to /var/abs/local/libtorrent-rasterbar-1_2-git/src/py2/bindings/python/libtorrent.egg-info/top_level.txt
writing manifest file '/var/abs/local/libtorrent-rasterbar-1_2-git/src/py2/bindings/python/libtorrent.egg-info/SOURCES.txt'
reading manifest file '/var/abs/local/libtorrent-rasterbar-1_2-git/src/py2/bindings/python/libtorrent.egg-info/SOURCES.txt'
writing manifest file '/var/abs/local/libtorrent-rasterbar-1_2-git/src/py2/bindings/python/libtorrent.egg-info/SOURCES.txt'
[100%] Built target python_bindings

@FranciscoPombal
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Current CMake script is using the deprecated PythonInterp and PythonLibs scripts. For what it's worth, here is an attempt at improving it, though supporting python 2 is not a priority: #4574

@wiserain
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Not sure how and what it is now, but it was okay with 1.2.5 and python2.7. Here is cmake command I used to build it.

cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX="/usr" \
    -DCMAKE_INSTALL_LIBDIR="lib" \
    -Dpython-bindings=ON \
    -Dboost-python-module-name="python27" \
    -DPython_ADDITIONAL_VERSIONS="2.7" \
    "../"
  make

@beroal
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beroal commented Apr 27, 2020 

    -DPython_ADDITIONAL_VERSIONS="2.7"

Thank you! I did not provide this variable to cmake. Now it builds.

@beroal beroal closed this as completed Apr 27, 2020
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@beroal @FranciscoPombal @wiserain