[Bug modula2/107612] plugin/m2rte doesn't build on Mac OS X 10.7

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107612

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
hmm .. some odd things.

With Rainer's patch actually the plugin build succeeded on x86_64-darwin19
(Catalina) 

so then the plugin fails to load because it is missing the libstdc++ version
needed (since that is not yet installed).

so if I then install libstdc++ and resume the build.

.. then the target library build fails with a lot of missing symbols.

(I am also trying on rosetta-2 x86_64 on macOS12).

A weird thing that I can't explain (and could be unrelated, it just happens to
appear at the same time) is that when I try to restart a parallel build (after
fixing things up) I end up with a make instance spinning at 100% .. yet if I
resume the build as a single process... it proceeds.

unfortunately, I have no time for analysis - I have some CPU cycles, but no
spare engineering ones...