[Bug 271374] emulators/mame-0.254 fails to build on {amd64,i386}-14-CURRENT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271374

--- Comment #18 from Alastair Hogge <agh@riseup.net> ---
I thought I had made some progress with cleaning up the Port makefile,
specifically tool chain related maintenance, however, Clang is still crashing.
The builds with Clang have been progressively difficult to succeed. It is
difficult to determine the cause, upstream is aware of cyclic build
dependencies, the limitations of the pre-build system GENie, consistent races
between generated code and building that code, progress is made addressing
these. I do not think building with only one make job as an alternative to
avoiding crashes work anymore. It is becoming difficult or impossible now to
test build, on multiple platforms and releases at once, with Clang. I used to
be able to run 6 x 4 builder poudriere-testport's, now I might be able to get
two if I stagger the start. On a AMD Ryzen 9 3950X 16-Core 64GiB of system
memory. Everything is built tmpfs. I recall the GCC builds using less memory
and will look at those again.

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