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arvidn / libtorrent

an efficient feature complete C++ bittorrent implementation
http://libtorrent.org
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Python binding 1.2.9 runtime fault #5040

Closed userdocs closed 4 years ago

userdocs commented 4 years ago

Please provide the following information

1.2.9

platform/architecture:

Debian 10 amd64

please describe what symptom you see, what you would expect to see instead and how to reproduce it.

Build the python binding against 1.29 and there is a runtime fault when trying to start deluge.

Traceback (most recent call last):
  File "/usr/local/bin/deluge-console", line 10, in <module>
    sys.exit(start())
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/__init__.py", line 19, in start
    Console().start()
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/console.py", line 154, in start
    from deluge.ui.console.main import ConsoleUI  # import here because (see top)
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/main.py", line 27, in <module>
    from deluge.ui.console.modes.addtorrents import AddTorrents
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/modes/addtorrents.py", line 21, in <module>
    from deluge.ui.console.modes.torrentlist.add_torrents_popup import report_add_status
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/modes/torrentlist/add_torrents_popup.py", line 16, in <module>
    from deluge.ui.console.widgets.popup import InputPopup, SelectablePopup
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/widgets/__init__.py", line 4, in <module>
    from deluge.ui.console.widgets.statusbars import StatusBars
  File "/usr/local/lib/python3.7/dist-packages/deluge/ui/console/widgets/statusbars.py", line 14, in <module>
    from deluge.core.preferencesmanager import DEFAULT_PREFS
  File "/usr/local/lib/python3.7/dist-packages/deluge/core/preferencesmanager.py", line 24, in <module>
    from deluge._libtorrent import lt
  File "/usr/local/lib/python3.7/dist-packages/deluge/_libtorrent.py", line 25, in <module>
    import libtorrent as lt
ImportError: /usr/local/lib/python3.7/dist-packages/libtorrent.cpython-37m-x86_64-linux-gnu.so: undefined symbol: _ZNK10libtorrent5entry4dictEv

This issue does not occur when i use 1.2.8 instead of 1.2.9. It is new and unique to this release.

FranciscoPombal commented 4 years ago

@userdocs

undefined symbol: _ZNK10libtorrent5entry4dictEv

Probably the same/similar cause as https://github.com/arvidn/libtorrent/issues/5024. Building libtorrent with C++14 should fix it.

userdocs commented 4 years ago

I am pretty sure it is, using this build command

$install_dir/bin/b2" -j$(nproc) fpic=on python="$python_short_version" dht=on encryption=on crypto=openssl i2p=on extensions=on variant=release threading=multi link=static boost-link=static runtime-link=static cxxstd=14 cxxflags="$CXXFLAGS" cflags="$CPPFLAGS" linkflags="$LDFLAGS" toolset=gcc install --prefix="$install_dir"
userdocs commented 4 years ago

To expand, i can successfully build qbittorrent using the same build method with no issues and the build path for libtorrent has cxx14 in the path so i am almost certain that all parts of my build are using the 14 standard, ,including boost and libtorrent.

2020-08-23_16-59-04

It could be related but i can't see how, with my limited understanding of the source code itself.

The only thing that fixes it is reverting back to 1.2.8.0 as i have not seen any obvious errors when building.

arvidn commented 4 years ago

it looks like there's some incompatibility between the main libtorrent library and the python binding. Are you sure both are builds of 1.2.9?

userdocs commented 4 years ago

Yes. I build libtorrent myself then create the binding from it. It worked fine until this release.

arvidn commented 4 years ago

If you demangle that symbol, its: libtorrent::entry::dict() const

I wonder why this didn't fail in CI. Possibly because CI only uses C++11.

arvidn commented 4 years ago

looking at this a bit more, it's not clear why that symbol wouldn't be in the main library. @userdocs Could you list the exported symbols in your libtorrent.dll? not the python binding, but main libtorrent library.

userdocs commented 4 years ago

readelf -Ws libtorrent.a give me 14 matches to this.

_ZNK10libtorrent5entry4dictB5cxx11Ev

And 0 matches to this

_ZNK10libtorrent5entry4dictEv

This seems to tie into this comment https://github.com/arvidn/libtorrent/issues/5040#issuecomment-678644936 but i don't understand why as i appear to be using cxx14. Here are my settings:

Configure script has finished system check.

   Config results:
  -=-=-=-=-=-=-=-=-

Package:
  name:                 libtorrent-rasterbar
  version:              1.2.9
  git revision:         a80f458

Build environment:
  build system:         x86_64-pc-linux-gnu
  host system:          x86_64-pc-linux-gnu
  target system:        x86_64-pc-linux-gnu

Compiler and linker flags:
  CPPFlags:             -I/root/python-libtorrent-build/include -I/root/python-libtorrent-build/include
  CFlags:               -pthread -g -O2 -fvisibility=hidden
  CXXFlags:             -std=c++14 -ftemplate-depth=512 -Wno-format-zero-length -fvisibility=hidden -fvisibility-inlines-hidden
  LDFlags:              -L/root/python-libtorrent-build/lib -Wl,--no-as-needed -ldl -L/root/python-libtorrent-build/lib -lpthread -pthread -fvisibility=hidden -fvisibility-inlines-hidden
  Libs:                 -lboost_system -lpthread
  Defs:                 -DPACKAGE_NAME=\"libtorrent-rasterbar\" -DPACKAGE_TARNAME=\"libtorrent-rasterbar\" -DPACKAGE_VERSION=\"1.2.9\" -DPACKAGE_STRING=\"libtorrent-rasterbar\ 1.2.9\" -DPACKAGE_BUGREPORT=\"arvid@libtorrent.org\" -DPACKAGE_URL=\"http://www.libtorrent.org\" -DPACKAGE=\"libtorrent-rasterbar\" -DVERSION=\"1.2.9\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DHAVE_PTHREAD_PRIO_INHERIT=1 -DHAVE_PTHREAD=1 -DHAVE_BOOST=/\*\*/ -DHAVE_CXX11=1 -DHAVE_BOOST_SYSTEM=/\*\*/ -DHAVE_CLOCK_GETTIME=1 -DNDEBUG=1 -DTORRENT_USE_INVARIANT_CHECKS=0 -DTORRENT_USE_OPENSSL=1 -DTORRENT_USE_LIBCRYPTO=1 -DHAVE_PYTHON=\"3.7\" -DHAVE_BOOST_PYTHON=/\*\*/ -DHAVE_ICONV=1 -DICONV_CONST= -DBOOST_ASIO_HAS_STD_CHRONO=1 -DBOOST_EXCEPTION_DISABLE=1 -DBOOST_ASIO_ENABLE_CANCELIO=1 -DTORRENT_BUILDING_SHARED=1

Build options:
  deprecated functions: yes
  debug build:          no
  invariant checks:     no
  logging support:      yes

Features:
  encryption support:   yes
  dht support:          yes

Extra builds:
  examples:             no
  tests:                no
  python bindings:      yes

Pthread library:
  CFlags:               -pthread
  Libs:                 -lpthread

Boost libraries:
  version:
  CPPFlags:             -I/root/python-libtorrent-build/include
  LDFlags:              -L/root/python-libtorrent-build/lib
  boost.system:         -lboost_system
  boost.python:         -lboost_python37

Python environment:
  -automake-
  binary:               /usr/bin/python3.7
  version:              3.7
  platform:             linux
  prefix:               ${prefix}
  exec_prefix:          ${exec_prefix}
  pythondir:            ${prefix}/lib/python3.7/site-packages
  pkgpythondir:         ${pythondir}/libtorrent-rasterbar
  pyexecdir:            ${exec_prefix}/lib/python3.7/site-packages
  pkgpyexecdir:         ${pyexecdir}/libtorrent-rasterbar

  -m4-
  cppflags:             -I/usr/include/python3.7m
  ldflags:
  extra libs:           -lcrypt -lpthread -ldl  -lutil -lm

External libraries:
  system libiconv:      no

OpenSSL library:
  OpenSSL Libs:         -lssl -lcrypto
  OpenSSL LDFlags:      -L/root/python-libtorrent-build/lib
  OpenSSL Includes:     -I/root/python-libtorrent-build/include

Type 'make' to compile libtorrent-rasterbar 1.2.9
or type 'make V=1' for verbose compiling
and then 'make install' to install it into /usr/local

CXXFLAGS = -std=c++14
LDFLAGS = -Wl,--no-as-needed -ldl -L/root/python-libtorrent-build/lib -lpthread -pthread
OS = LINUX
...patience...
...found 1551 targets...
...updating 414 targets...
arvidn commented 4 years ago

could you include a few more lines from the b2 output, right after you cut off?

userdocs commented 4 years ago 
CXXFLAGS = -std=c++14
LDFLAGS = -Wl,--no-as-needed -ldl -L/root/python-libtorrent-build/lib -lpthread -pthread
OS = LINUX
...patience...
...found 1551 targets...
...updating 414 targets...
common.copy /root/python-libtorrent-build/include/../include/libtorrent/xml_parse.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/write_resume_data.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/web_peer_connection.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/web_connection_base.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/version.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/vector_utils.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/utp_stream.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/utp_socket_manager.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/upnp.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/utf8.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/units.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/union_endpoint.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/udp_tracker_connection.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/udp_socket.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/tracker_manager.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent_status.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent_peer_allocator.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent_peer.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent_info.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent_handle.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent_flags.hpp
common.copy /root/python-libtorrent-build/include/../include/libtorrent/torrent.hpp
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/add_scalar.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/fe.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/ge.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/key_exchange.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/announce_entry.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/sc.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/keypair.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/alert_manager.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/assert.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/sign.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bandwidth_limit.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/ed25519/src/verify.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bandwidth_queue_entry.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bandwidth_manager.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bitfield.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bdecode.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bloom_filter.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/chained_buffer.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/close_reason.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/cpuid.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/crc32c.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/block_cache.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/alert.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_buffer_holder.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/choker.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_buffer_pool.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_io_job.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_job_fence.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/create_torrent.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_io_thread_pool.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_job_pool.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/error_code.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/entry.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/escape_string.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/string_util.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/disk_io_thread.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/file.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/fingerprint.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/gzip.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/file_storage.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/path.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/hex.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/hasher.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/http_parser.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/identify_client.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/ip_filter.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/http_stream.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/ip_notifier.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/merkle.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/ip_voter.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/platform_util.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/listen_socket_handle.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/web_connection_base.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/http_connection.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/bt_peer_connection.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/http_seed_connection.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/web_peer_connection.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/peer_connection_handle.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/i2p_stream.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/lazy_bdecode.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/instantiate_connection.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/packet_buffer.o
gcc.compile.c++ bin/gcc-8/release/crypto-openssl/cxxstd-14-iso/fpic-on/link-static/threading-multi/src/peer_connection.o
...on 100th target...

and so on.

userdocs commented 4 years ago

Are you able to shed any light on this as i am a little lost as to whether the issue is with my build process or the code of this release?

As far as i can see i am using cxx14 in the build process for boost and libtorrent and cannot find any documented solution i am not using to build with cxx14.

I have CXXFLAGS="-std=c++14" and cxxstd=14 set.

If this is a release issue i will just wait it out.

arvidn commented 4 years ago

The mangled symbol you found in libtorrent.a is:

libtorrent::entry::dict[abi:cxx11]() const

that abi:cxx11 is an ABI tag. My reading of the abi_tag attribute is that this is attached to this function because the return value is tagged. The return value being std::map. Here's a post describing abi tags.

So, fundamentally, it still seems the client and the library are built in some slightly ABI incompatible ways.

Btw, the error you get in python suggests that the libtorrent library is not linked statically into the python binding. If you want to do that you have to say libtorrent-link=static (and possibly boost-link=static too), on the b2 command line. This could also explain the issue, that perhaps the binding is pulling in an older shared library. ldd on the python module should tell you.

Can you tell me the command you invoke to build the binding on debian? Perhaps I can reproduce it on ubuntu.

userdocs commented 4 years ago

libtorrent-link=static is undocumented and b2 also throws an error about it not being recognised.

Here is my ldd of both the libtorrent.a library and the python library. It is about as static as it can be due to glibc not linking statically on these platforms.

root@localhost:~# ldd python-libtorrent-build/lib/libtorrent.a
        not a dynamic executable

root@localhost:~# ldd python-libtorrent-build/completed/lib/python3.8/site-packages/libtorrent.cpython-38-x86_64-linux-gnu.so
        linux-vdso.so.1 (0x00007ffdb39e9000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fcc4b679000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fcc4b656000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fcc4b475000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fcc4b326000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fcc4b30b000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcc4b119000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fcc4c110000)

I use a build script that you can just use on an Ubuntu VM to quickly produce all the relevant libraries (slightly modified from the standard due to the addition of openmpi).

https://gist.github.com/userdocs/fc0c45cfe3200f49ed21e5888bef4367

Relevant lines.

Boost install https://gist.github.com/userdocs/fc0c45cfe3200f49ed21e5888bef4367#file-python-binding-sh-L377

Libtorrent and python

https://gist.github.com/userdocs/fc0c45cfe3200f49ed21e5888bef4367#file-python-binding-sh-L401#L403

Note: the python binding requires the use of ./configure to successfully build against the libtorrent library. Perhaps the issue arises here somehow.

userdocs commented 4 years ago

I think the problem is here

...updated 414 targets...
running install
running build
running build_ext
building 'libtorrent' extension
creating build
creating build/temp.linux-x86_64-3.8
creating build/temp.linux-x86_64-3.8/root
creating build/temp.linux-x86_64-3.8/root/python-libtorrent-build
creating build/temp.linux-x86_64-3.8/root/python-libtorrent-build/libtorrent
creating build/temp.linux-x86_64-3.8/root/python-libtorrent-build/libtorrent/bindings
creating build/temp.linux-x86_64-3.8/root/python-libtorrent-build/libtorrent/bindings/python
creating build/temp.linux-x86_64-3.8/root/python-libtorrent-build/libtorrent/bindings/python/src
x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -I/root/python-libtorrent-build/include -fPIC -I../../include -I/root/python-libtorrent-build/include -I/root/python-libtorrent-build/include -I/root/python-libtorrent-build/include -I/root/python-libtorrent-build/include -I/usr/include/python3.8 -c /root/python-libtorrent-build/libtorrent/bindings/python/src/alert.cpp -o build/temp.linux-x86_64-3.8/root/python-libtorrent-build/libtorrent/bindings/python/src/alert.o -DTORRENT_USE_OPENSSL -DTORRENT_USE_LIBCRYPTO -DBOOST_ASIO_HAS_STD_CHRONO=1 -DBOOST_EXCEPTION_DISABLE -DBOOST_ASIO_ENABLE_CANCELIO -DTORRENT_LINKING_SHARED -std=c++1y -ftemplate-depth=512 -Wno-format-zero-length -fvisibility=hidden -fvisibility-inlines-hidden -Wno-deprecated-declarations -g0 -Os -std=c++11

Specifically this -std=c++11 when the python binding starts.

userdocs commented 4 years ago

I introduced that in my testing, the normal command also has -std=c++14.

userdocs commented 4 years ago

I have created a working build by switching to b2 for the building the python module instead of python setup install method.

This creates a working library with which solves the original issue but does not explain it.

"$install_dir/bin/b2" -j$(nproc) fpic=on python="$python_short_version" dht=on encryption=on crypto=openssl i2p=on extensions=on variant=release threading=multi libtorrent-link=static boost-link=static cxxstd=14 cxxflags="$CXXFLAGS" cflags="$CPPFLAGS" linkflags="$LDFLAGS" toolset=gcc stage_module