luajit: add universal variant

[ryandesign (Ryan Carsten Schmidt)]

If possible, please add a universal variant to the luajit port.

[anddam (Andrea D'Amore)]

I'm not sure it can be built universal, src/Makefile is guessing the arch using $(CC) $(CFLAGS) -E lj_arch.h -dM and searching the output for known arch strings, this fails when passing two -arch because the preprocessor doesn't support that

clang: error: cannot use 'c-header-cpp-output' output with multiple -arch options

Any suggestion?

[ryandesign (Ryan Carsten Schmidt)]

The lack of a universal variant in luajit is still a problem. Because of this, the ports that depend on luajit can't have universal variants either, and neither can the ports depending on those ports, and so on.

If the build system cannot build for multiple architectures simultaneously, it can be told to build for each architecture separately using the muniversal portgroup.

[ryandesign (Ryan Carsten Schmidt)]

This affects gegl-0.4, for example.

[Frederik van Hövell <frederik@…>]

In b3427f9e6de113b64620377780cf52f80248d152/macports-ports (master):

luajit: Support 'universal' variant

• Add PortGroup muniversal 1.1
• Use muniversal portgroup, which builds each requested arch separately
  • Suggestion by Ryan Carsten Schmidt (ryandesign) - see ticket below
• Fix universal build on x86_64 hosts
  • Cleanup options for building on separate architecture (that is not runnable on current host)
    • i.e. when targetting arm64 from a x86_64 host system
  • Based on:
    • ​https://www.freelists.org/post/luajit/Building-universal-libraries-x86-64-and-arm64-for-osx,4
    • ​https://git.openembedded.org/meta-openembedded/plain/meta-oe/recipes-devtools/luajit/luajit_git.bb

Closes: #41304