Problem building Panda on Mac with Python3 from Homebrew

Installation
1

On my quest to make double precision wheels of Panda, I’m struggling build Panda on MacOS using Python3 from Homebrew.

I get several errors : if I do anything makepanda does not find libpython3.7m, if I follow Installing Panda3D on a Mac with Python 3.4? it builds partially, but fails later as there are unresolved symbols in pzip, …

Looking at the buildbot script for mac os I don’t see anything specific (and seeing that the python interpreter used to launch the build is /usr/local/bin/python I guess it’s also using Homebrew), there is also https://github.com/panda3d/panda3d/pull/263 but it seems invasive.

So, what is the recommended way ?

2

The unresolved symbols in pzip sounds like you may be referring to this problem:

It is caused by using thirdparty packages that are compiled against an older macOS SDK.

3

Ah, I missed that one :slight_smile: Which is exactly the problem I’m having with pzip, thanks!

4

It builds fine now, however the *.so libraries (core.so, direct.so, …) are not present in the generated wheel

5

Actually makewheel.py looks for files ending with “.cpython-37m-darwin.so” however makepanda.py generates simple “.so” files.

Nota: To be able to build I modified the line 2161 from :

elif GetTarget() == 'darwin':

to :

elif False:

But I don’t see why it should impact the suffix of the generated libraries.

6

Actually it’s worse than that, the files under built/panda3d were files from an older build, after cleaning and rebuilding all, the directory is empty and there is no core.so (or any variant) built anywhere.

7

Did you build with Python bindings enabled? Did the makepanda output say anything about not building with Python support enabled?

8

ah right that make more sense, I built with --everything and I saw “Using Python 3.7” but I overlooked the warning a dozen lines later :

WARNING: Could not locate thirdparty package python, excluding from build

I guess I’m back to square one to indicate to makepanda where my version of Python resides, I though the modification in SdkLocatePython() would be enough.

9

With the following command (and the test still deactivated in makepanda.py) it starts building with python enabled :

makepanda/makepanda.py --everything --wheel --threads 4 --osxtarget=10.7 --python-incdir  /usr/local/Cellar/python/3.7.2/Frameworks/Python.framework/Versions/3.7/include --python-libdir  /usr/local/Cellar/python/3.7.2/Frameworks/Python.framework/Versions/3.7/lib
10

And the build is successful and the wheel is working :slight_smile: