conda python3 and system python3

[Vincent Delecroix]

Hello,

I am trying to build sage in a conda environment. I did install a lot
of things in it (including Python 3.9). However, the configure
scripts does choose a strange solution

configure:34331: result: no, this is a misconfigured Python whose
sysconfig compiler/linker flags contain -I or -L options, which may
cause wrong versions of libraries to leak into the build
of Python packages - see https://trac.sagemath.org/ticket/31132; to use
it anyway, use ./configure
--with-python=/home/vincent/miniconda3/envs/sage-build/bin/python3
configure:33784: checking ... whether /usr/bin/python3 is good

Instead of using the conda Python3 it succeeds in using the system
one. Which would better be avoided here.

Vincent

[Isuru Fernando]

Looks like the check for misconfigured python is a little bit too extreme.

If sysconfig's CFLAGS includes any path in the environment's CFLAGS,

then it shouldn't be considered misconfigured.

Isuru

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[Matthias Koeppe]

This is already tracked in https://trac.sagemath.org/ticket/31539