Fix build errors with pplpy, scipy, kiwisolver, fpylll on macos with system python3 #29408
Description
On the platform local-homebrew-macos defined by tox.ini, running on a macos-latest system as defined in https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners#supported-runners-and-hardware-resources, a branch that includes #27824 (spkg-configure.m4 for python3) leads to the following error with pplpy, as seen in https://github.com/mkoeppe/sage/runs/538432631:
g++ -sdk macosx clang -bundle -undefined dynamic_lookup -L/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/local/lib -Wl,-rpath,/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/local/lib -L/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/homebrew/opt/readline/lib -L/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/homebrew/lib -I/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/homebrew/opt/readline/include -I/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/homebrew/include build/temp.macosx-10.14-x86_64-3.7/ppl/linear_algebra.o build/temp.macosx-10.14-x86_64-3.7/ppl/ppl_shim.o -lgmp -lgmpxx -lppl -lm -o build/lib.macosx-10.14-x86_64-3.7/ppl/linear_algebra.cpython-37m-darwin.so
clang: error: unknown argument: '-sdk'
clang: error: no such file or directory: 'macosx'
clang: error: no such file or directory: 'clang'
error: command 'g++' failed with exit status 1
Running setup.py install for pplpy: finished with status 'error'
Cleaning up...
Same kind of error with scipy, kiwisolver, fpylll.
Full logs can be downloaded at the above link.
To test locally, using #29104 + #27824, remove all python3 from the homebrew in /usr/local
and run
tox -e local-homebrew-macos-standard -- V=0 pplpy
With #29417, it is:
tox -e local-homebrew-macos-standard-python3_xcode -- V=0 pplpy
(broken out from #29404)
CC: @dimpase @videlec @kiwifb @mwageringel @embray @jhpalmieri @vbraun
Component: packages: standard
Author: Matthias Koeppe
Branch/Commit: 8317c3e
Reviewer: John Palmieri
Issue created by migration from https://trac.sagemath.org/ticket/29408