Runtime linker error in some builds --without-system-gcc #29675
Description
This is only a minor problem because we really only need our own gcc build when system GCC is 10.x.
tox -e docker-debian-buster-standard-python2-gcc_spkg (https://github.com/mkoeppe/sage/runs/661787508):
[dochtml] File "sage/matrix/args.pyx", line 23, in init sage.matrix.args (build/cythonized/sage/matrix/args.c:21224)
[dochtml] File "/sage/local/lib/python2.7/site-packages/sage/matrix/matrix_space.py", line 46, in <module>
[dochtml] from . import matrix_modn_sparse
[dochtml] File "sage/matrix/matrix_integer_sparse.pxd", line 5, in init sage.matrix.matrix_modn_sparse (build/cythonized/sage/matrix/matrix_modn_sparse.cpp:16301)
[dochtml] ImportError: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /sage/local/lib/python2.7/site-packages/sage/matrix/matrix_integer_sparse.so)
[dochtml] Full log file: logs/dochtml.log
Also:
tox -e docker-debian-buster-standard-gcc-spkg(https://github.com/mkoeppe/sage/runs/743789697)tox -e docker-ubuntu-bionic-standard-gcc-spkg
(https://github.com/mkoeppe/sage/runs/743789609)
CC: @dimpase
Component: build
Issue created by migration from https://trac.sagemath.org/ticket/29675