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I installed xeus-cling with the usual conda install xeus-cling and get the following runtime errors when I go to start a C++ kernel (11, 14 and 17 versions) in the Jupyter notebook:

/opt/anaconda3/envs/cling/include/c++/v1/stdlib.h:143:12: error: no member named 'ldiv' in the global namespace
  return ::ldiv(__x, __y);

< many such errors, eventually >

/opt/anaconda3/envs/cling/include/c++/v1/cstdlib:122:9: error: no member named 'rand' in the global namespace
using ::rand;
      ~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]

I tried re-installing XCode command line tools - no go. Same setup works fine on my Linux machine.

How can I fix these errors and get the kernel to start?

I filed an issue here with the recent XCode version 12.5.1 (12E507) - it looks like either xeus-cling conda package is using an incompatible toolchain, or XCode is misconfigured - either way, the C++ kernel won't start. Conda 4.10.1 with Python 3.9.6 (in case this matters). Thanks in advance!

Max Kaznady
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  • Do you by any chance install things from both conda-forge and default ? Try to make the channels strict ? Which macos os version ? and M1 or intel mac ? – Matt Jul 27 '21 at 18:13
  • I'm having the same problem. Installed Xcode. Install both conda-forge and default. I am running Big Sur on my Mac mini M1 chip and MacBook Pro on intel. Both had the same issues. What do you mean by making the channels strict – Arthur Decker Jul 27 '21 at 23:39
  • +1 to the above response: same problems on Intel and M1, both conda channels (also tried others), same Big Sur 11.3.1 – Max Kaznady Aug 01 '21 at 14:17
  • I have the same issue on my MacBook Pro on intel with Big Sur 11.5. – William GILLARD Sep 17 '21 at 06:36
  • Same error on macbook pro on M1 with macOS Monterey – Isky Dec 28 '21 at 12:08

1 Answers1

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See here (GitHub)

SylvainCorlay suggests trying:

conda remove libcxx --force

And it worked for me (MacOS Monterey, Mambaforge)

Arkivaren
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