homebrew-macos-standard: Fix Fortran-related doctest errors

[mkoeppe]

From #29451:

https://github.com/mkoeppe/sage/runs/559191935

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sage -t src/sage/interfaces/gap.py  # 1 doctest failed
sage -t src/sage/misc/inline_fortran.py  # 3 doctests failed
sage -t src/sage/misc/persist.pyx  # 2 doctests failed
sage -t src/sage/repl/ipython_extension.py  # 4 doctests failed
----------------------------------------------------------------------

      File "/Users/runner/runners/2.165.2/work/sage/sage/.tox/local-homebrew-macos-standard/local/lib/python3.7/site-packages/sage/misc/inline_fortran.py", line 194, in eval
        "failed to compile Fortran code:\n{}".format(exc.output))
    RuntimeError: failed to compile Fortran code:
    b'Could not locate executable g++ -std=gnu++11 -pthread -bundle -undefined dynamic_lookup\nIn file included from /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/tmpjff9tknw/src.macosx-10.15-x86_64-3.7/fortran_modulemodule.c:16:\nIn file included from /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/tmpjff9tknw/src.macosx-10.15-x86_64-3.7/fortranobject.h:13:\nIn file included from 

To reproduce (with #29417):

 tox -e local-homebrew-macos-standard -- ptest 

CC: @jhpalmieri @isuruf @dimpase

Component: porting

Reviewer: John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/29463

[mkoeppe]

comment:1

Should check if the fix in #29408 fixes any of these too.

[mkoeppe]

comment:2

Tests at https://github.com/mkoeppe/sage/actions/runs/73955490

[jhpalmieri]

comment:3

The fix in #29408 works at least with the OS X Python installation. When I say "works," I mean that all tests pass. I did, however, twice see a dialog box saying "Python quit unexpectedly."

I will also try with Homebrew's Python.

[jhpalmieri]

comment:4

Same behavior with Homebrew's Python. So if #29408 gets a positive review, we can close this.

[mkoeppe]

comment:5

Replying to @jhpalmieri:

The fix in #29408 works at least with the OS X Python installation. When I say "works," I mean that all tests pass. I did, however, twice see a dialog box saying "Python quit unexpectedly."

Yes, I have seen this too on my machine. My guess is that we have some tests that crash some python process deliberately

[jhpalmieri]

comment:6

Oh, yes, that makes sense.

[mkoeppe]

comment:8

Still present on 9.1.rc0 because #29408 is not merged

[jhpalmieri]

comment:9

Can now be closed, I think.

[jhpalmieri]

Reviewer: John Palmieri