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This comment from @AvacadoCookie should be pinned, IMO.

If anyone is getting errors about Cython or setuptools, and they are using Conda, that comment has the answer.

If anyone is getting errors about Cython or setuptools, and they are using pyenv, there are 2 possible ways to fix it:

1. pyenv local system to set Python back to the system installed Python for this session.
2. pip install Cython setuptools to install the necessary packages to your preferred python installation.

For all users with ModuleNotFoundError: No module named 'Cython' or 'setuptools' reported, please try the following methods to address the problem:

1. Quit conda environment. Now after which python typed in console, the output should be /usr/bin/python.
2. Try again.
3. If the installation still failed, try again after pacman -S cython python-setuptools.

@nadavz the error is because you need gcc-libs in the system, Mike maybe we need to add that package in the makedepends list

@nadavz thank you for telling us. Please try (re)installing lib32-gcc-libs. If that does not work try "pacman -S --needed base-devel".

For me it failed with:

[1/1] Cythonizing _pydevd_bundle/pydevd_cython.pyx
running build_ext
building '_pydevd_bundle.pydevd_cython' extension
creating build
creating build/temp.linux-x86_64-3.9
creating build/temp.linux-x86_64-3.9/_pydevd_bundle
gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -fno-semantic-interposition -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fPIC -I/usr/include/python3.9 -c _pydevd_bundle/pydevd_cython.c -o build/temp.linux-x86_64-3.9/_pydevd_bundle/pydevd_cython.o
creating build/lib.linux-x86_64-3.9
creating build/lib.linux-x86_64-3.9/_pydevd_bundle
gcc -pthread -shared -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -fno-semantic-interposition -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection build/temp.linux-x86_64-3.9/_pydevd_bundle/pydevd_cython.o -L/usr/lib -o build/lib.linux-x86_64-3.9/_pydevd_bundle/pydevd_cython.cpython-39-x86_64-linux-gnu.so
copying build/lib.linux-x86_64-3.9/_pydevd_bundle/pydevd_cython.cpython-39-x86_64-linux-gnu.so -> _pydevd_bundle
[1/1] Cythonizing _pydevd_frame_eval/pydevd_frame_evaluator_common.pyx
running build_ext
building '_pydevd_frame_eval.pydevd_frame_evaluator_common' extension
creating build/temp.linux-x86_64-3.9/_pydevd_frame_eval
gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -fno-semantic-interposition -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fPIC -I_pydevd_frame_eval -I/usr/include/python3.9 -c _pydevd_frame_eval/pydevd_frame_evaluator_common.c -o build/temp.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_common.o
In file included from /usr/include/python3.9/internal/pycore_interp.h:13,
                 from _pydevd_frame_eval/internal_pycore.h:7,
                 from _pydevd_frame_eval/pydevd_frame_evaluator_common.c:640:
/usr/include/python3.9/internal/pycore_gc.h:61: warning: "_PyGC_FINALIZED" redefined
   61 | #define _PyGC_FINALIZED(o) \
      |
In file included from /usr/include/python3.9/objimpl.h:208,
                 from /usr/include/python3.9/Python.h:85,
                 from _pydevd_frame_eval/pydevd_frame_evaluator_common.c:25:
/usr/include/python3.9/cpython/objimpl.h:131: note: this is the location of the previous definition
  131 | #  define _PyGC_FINALIZED(o) PyObject_GC_IsFinalized(o)
      |
creating build/lib.linux-x86_64-3.9/_pydevd_frame_eval
gcc -pthread -shared -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -fno-semantic-interposition -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection build/temp.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_common.o -L/usr/lib -o build/lib.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_common.cpython-39-x86_64-linux-gnu.so
copying build/lib.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_common.cpython-39-x86_64-linux-gnu.so -> _pydevd_frame_eval
[1/1] Cythonizing _pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.pyx
running build_ext
building '_pydevd_frame_eval.pydevd_frame_evaluator_py39_and_above' extension
gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -fno-semantic-interposition -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fPIC -I_pydevd_frame_eval -I./_pydevd_frame_eval -I/usr/include/python3.9 -c _pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.c -o build/temp.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.o
In file included from /usr/include/python3.9/internal/pycore_interp.h:13,
                 from _pydevd_frame_eval/internal_pycore.h:7,
                 from _pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.c:641:
/usr/include/python3.9/internal/pycore_gc.h:61: warning: "_PyGC_FINALIZED" redefined
   61 | #define _PyGC_FINALIZED(o) \
      |
In file included from /usr/include/python3.9/objimpl.h:208,
                 from /usr/include/python3.9/Python.h:85,
                 from _pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.c:26:
/usr/include/python3.9/cpython/objimpl.h:131: note: this is the location of the previous definition
  131 | #  define _PyGC_FINALIZED(o) PyObject_GC_IsFinalized(o)
      |
gcc -pthread -shared -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -fno-semantic-interposition -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection build/temp.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.o -L/usr/lib -o build/lib.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.cpython-39-x86_64-linux-gnu.so
copying build/lib.linux-x86_64-3.9/_pydevd_frame_eval/pydevd_frame_evaluator_py39_and_above.cpython-39-x86_64-linux-gnu.so -> _pydevd_frame_eval
Compiled amd64
Note: may need sudo apt-get install libx32gcc-4.8-dev and sudo apt-get install libc6-dev-i386 and sudo apt-get install g++-multilib to compile 32 bits
In file included from /usr/include/features.h:497,
                 from /usr/include/bits/libc-header-start.h:33,
                 from /usr/include/stdio.h:27,
                 from attach.cpp:7:
/usr/include/gnu/stubs.h:7:11: fatal error: gnu/stubs-32.h: No such file or directory
    7 | # include <gnu/stubs-32.h>
      |           ^~~~~~~~~~~~~~~~
compilation terminated.
mv: cannot stat 'attach_linux_x86.so': No such file or directory

I then installed core/lib32-glibc which provides /usr/include/gnu/stubs-32.h, but then I got

<SNIP>
Compiled amd64
Note: may need sudo apt-get install libx32gcc-4.8-dev and sudo apt-get install libc6-dev-i386 and sudo apt-get install g++-multilib to compile 32 bits
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: cannot find libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
collect2: error: ld returned 1 exit status
mv: cannot stat 'attach_linux_x86.so': No such file or directory
Compiled x86

I'm not in a virtualenv shell.

Don't build it in a virtualenv active shell

As of 2021.2.3, the package build fails for me with

ModuleNotFoundError: No module named 'Cython'
==> ERROR: A failure occurred in build().
    Aborting...

Hi @franga2000 for me the debugging works without problems with libffi from core repo, what is your error? I don't like to add aur depend even more if I cannot confirm the problem...

The libffi package no longer includes the ABI v7 compatibility library (see [0]), but I can't get the PyCharm debugger running without it. Installing aur/libffi7 fixes it, so this package should probably depend on it.

[0] https://github.com/archlinux/svntogit-packages/commit/856bd5b52222f1456334e0a08c13e58bdfda9db0#diff-3e341d2d9c67be01819b25b25d5e53ea3cdf3a38d28846cda85a195eb9b7203a

Hi @olii, good catch thanks, the best is to build it running the script, fixed.

After install, when trying to attach the debugger to a running Python process I get the following error:

RuntimeError: Could not find dll file to inject: /opt/pycharm-professional/plugins/python/helpers/pydev/pydevd_attach_to_process/attach_linux_amd64.so

I noticed that the .so library is in the original package but the library is deleted in the build process:

find pycharm-${pkgver}/plugins/python/helpers/pydev/ \( -name *.so -o -name *.pyd \) -delete

I think that we should either leave libraries in pydevd_attach_to_process untouched or rebuild them by the script located in:

/opt/pycharm-professional/plugins/python/helpers/pydev/pydevd_attach_to_process/linux_and_mac/compile_linux.sh

What do you think?

@donny, thanks for the suggestion. I deleted my comment. With the PKGEXT var set it goes much better.