[MacPorts] #64041: [M1 Monterey] Trying to replace gcc-devel with gcc11: py39-numpy+gcc11+openblas fails

[MacPorts]

#64041: [M1 Monterey] Trying to replace gcc-devel with gcc11:
py39-numpy+gcc11+openblas fails
--------------------+------------------------
 Reporter:  ednl    |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.7.1
 Keywords:          |       Port:  py39-numpy
--------------------+------------------------
 For some reason, gfortran is linked to gcc-devel instead of to gcc11, and
 py39-numpy depends on gfortran in its standard variant. So when I
 unsuspectingly installed py39-numpy, I got gcc-devel "for free". Trouble
 is, there's a new version of the devel branch every day, so any general
 port upgrade now pulls in new versions of gcc-devel and libgcc-devel,
 which takes a long time.

 While trying to replace the current versions, I successfully installed
 `gcc11`, `libgcc11` and `openblas +gcc11 +lapack +native` but when I tried
 to `sudo port install py39-numpy +gcc11 +openblas` it fails with:

 {{{
 :info:build In file included from
 /opt/local/Library/Frameworks/Python.framework/Versions/3.9/include/python3.9/pyport.h:205,
 :info:build                  from
 /opt/local/Library/Frameworks/Python.framework/Versions/3.9/include/python3.9/Python.h:50,
 :info:build                  from
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_python_py-
 numpy/py39-numpy/work/numpy-1.21.4/numpy/core/src/umath/_umath_tests.dispatch.c:9,
 :info:build                  from
 build/src.macosx-12.0-arm64-3.9/numpy/core/src/umath/_umath_tests.dispatch.asimdhp.c:12:
 :info:build /opt/local/lib/gcc11/gcc/arm64-apple-darwin21/11.1.0/include-
 fixed/math.h:68:5: error: #error "Unsupported value of
 __FLT_EVAL_METHOD__."
 :info:build    68 | #   error "Unsupported value of __FLT_EVAL_METHOD__."
 }}}

 Apart from fixing this error, I think the best solution would be to once
 again link `gfortran` to a normal release version of gcc, if that is
 possible, instead of to gcc-devel.

-- 
Ticket URL: <https://trac.macports.org/ticket/64041>
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