Cannot import cppyy under Mac OS

[yzhang-23]

I'm trying to use cppyy on my Mac mini M2 pro (Mac OS Ventura 13.3.1). Following the documentation, I ran

python -m pip install cppyy

and then want to test the installation with python, but I got the following error messages (only the top messages are shown):

% python
Python 3.11.1 (main, Feb 15 2023, 12:26:07) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cppyy
(Re-)building pre-compiled headers (options: -O2); this may take a minute ...
In file included from input_line_10:9:
In file included from ./etc/dictpch/allHeaders.h:373:
./include/TClassEdit.h:29:10: fatal error: 'cxxabi.h' file not found
#include <cxxabi.h>
^~~~~~~~~~
Error: ./bin/rootcling: compilation failure (/var/folders/rc/fl4k257n5qd_385smlp095lh0000gn/T/allDict55c2af541f_dictUmbrella.h)
/Users/yzhang/Library/Python/3.11/lib/python/site-packages/cppyy_backend/loader.py:139: UserWarning: No precompiled header available (failed to build); this may impact performance.
warnings.warn('No precompiled header available (%s); this may impact performance.' % msg)
In file included from libCoreLegacy dictionary payload:7:
In file included from /Users/yzhang/Library/Python/3.11/lib/python/site-packages/cppyy_backend/include/Riostream.h:24:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/fstream:192:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/filesystem:938:29: error: constructor for 'std::filesystem::path' must explicitly initialize the member '_pn' which does not have a default constructor
_LIBCPP_INLINE_VISIBILITY path() noexcept {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/filesystem:1512:15: note: member is declared here
string_type _pn;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/string:693:5: note: 'std::string' declared here
basic_string
^
...

What could be the reason for these errors? Any hint? Thank you very much!

[wlav]

Same as #150. Unfortunately, I can't reproduce it and have no idea what is causing it. :( In addition, on a normal install, the pre-compiled header should be build as part of the install process, not on first use.

[yzhang-23]

on a normal install, the pre-compiled header should be build as part of the install process, not on first use.

I was also surprised that the pre-compiled headers were built on first use. Is there a way to build the headers before importing cppyy?

[wlav]

The install process already does that. You should be able to find a .pch file in /Users/yzhang/Library/Python/3.11/lib/python/site-packages/cppyy_backend/etc. But otherwise the process of building the PCH is the same as cppyy uses when it fails to find it.

[Alex-EEE]

Have you tried installing with conda

(WORK) $ conda install -c conda-forge cppyy
(WORK) [current compiler] $

this installs a different compiler, might have better luck

[yzhang-23]

Have you tried installing with conda

(WORK) $ conda install -c conda-forge cppyy
(WORK) [current compiler] $

this installs a different compiler, might have better luck

I tried to install with conda, but that was for cppyy 2.4.0. Is there a way to install cppyy 3.0.0 with conda?

[wlav]

I'm trying to complete the github workflows that were contributed (wlav/cppyy-backend#8). Although it doesn't run all yet, the building of the Mac wheels does and I'm finding that those wheels do NOT work on my laptop. In a way, that's not good, but it may also help me to get some fixes for upstream as it's the only reliable way that I have to break things on my box.

[wlav]

Should all be good now with release 3.1.0. Feel free to reopen if you find otherwise.