gfortran does not accept option -m64 on arch arm64

[platipodium (Carsten Lemmen)]

On arm64 with gccdevel (11) the configure script to netcdf-fortran wrongly configures -m64 as a command line option.

FCFLAGS='-pipe -Os -m64'

[platipodium (Carsten Lemmen)]

Log output from ./configure

[kencu (Ken)]

Oh boy... it would almost be easier to fix up the gcc fortran driver to accept that flag, than it would be to change all of the many buildscripts to somehow know not to send the flag to gcc on arm.

Let me ask upstream.

configure:6759: /opt/local/bin/gfortran-mp-devel -c -pipe -Os -m64 -x f95 conftest.f90 >&5
gfortran-mp-devel: error: unrecognized command-line option '-m64'

[kencu (Ken)]

<​https://github.com/iains/gcc-darwin-arm64/issues/40>

[platipodium (Carsten Lemmen)]

Could you think of a workaround until this is fixed upstream?

[kencu (Ken)]

Upstream put in a fix allowing the gfortran driver on arm64 to accept the m64 flag.

<​https://github.com/iains/gcc-darwin-arm64/commit/a2840b63dc4e557cd270d8d5aad87d8d60ca8c53>.

A new version of gcc-devel was put through MacPorts this morning with this commit in it.

<​https://github.com/macports/macports-ports/commit/3faf6f298205fdedd3e244631aa47799a8ef2be8>

so this should be fixed once you get that new version of gcc-devel installed.

Please report back success and we can close this.

[platipodium (Carsten Lemmen)]

port install libgcc-devel @11-20210124_0 gcc-devel @11-20210124_0 netcdf-fortran

Confirmed working for me now. Thanks for reporting this upstream and getting it fixed.