fftw-3 @3.3.10 +universal fails to build with universal_archs containing arm64 and x86_64

[wenbingzhang]

--->  Configuring fftw-3
Error: Failed to configure fftw-3: consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_fftw-3/fftw-3/work/fftw-3.3.10-arm64/config.log
Error: Failed to configure fftw-3: configure failure: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_fftw-3/fftw-3/main.log for details.

[ryandesign (Ryan Carsten Schmidt)]

It looks like you're on an Intel Mac running macOS 12 and you're trying to compile this port for arm64. Is that right?

The log says:

./configure: line 2408: /opt/local/bin/gfortran-mp-13: Bad CPU type in executable

What is the CPU type of that executable? This command would tell you:

file /opt/local/bin/gfortran-mp-13

Also, for what architecture does MacPorts think it has installed it? This command would tell you:

port -v installed $(port provides /opt/local/bin/gfortran-mp-13)

[wenbingzhang]

/opt/local/bin/gfortran-mp-13: Mach-O 64-bit executable x86_64

[wenbingzhang]

The following ports are currently installed:
  gcc13 @13.2.0_4+stdlib_flag (active) requested_variants='' platform='darwin 21' archs='x86_64' date='2024-03-22T15:00:55+0800'
  gcc13 @13.2.0_4+stdlib_flag+universal requested_variants='+universal' platform='darwin 21' archs='arm64 x86_64' date='2024-03-22T14:15:19+0800

[jmroot (Joshua Root)]

Universal with arm64 and x86_64 isn't going to work out of the box for anything that builds with gfortran or gcc generally, because you can't target different architectures with the same gcc (except i386 and x86_64 via multilib).