Build error on macOS: ar: Argument list too long (there is a fix, but a better one wanted)

[barracuda156]

On macOS there is an issue with length of ar arguments: I get an error ar: Argument list too long.
I made a fix, but it is quite ugly :)

I had to split the target here: https://github.com/macports/macports-ports/blob/1c8cb98aa54e71148f4a5c416a6c82adb20f5a00/math/AlphaSparse/files/0010-Makefile.tail-split-lib-target-to-fix-ar-error.patch
And also re-shuffle files from plain/kernel: https://github.com/macports/macports-ports/blob/1c8cb98aa54e71148f4a5c416a6c82adb20f5a00/math/AlphaSparse/Portfile#L42

Can it be fixed in a neater way?

[barracuda156]

Turned out that the failure occurs even on x86_64 and recent macOS like Catalina: https://build.macports.org/builders/ports-10.15_x86_64-builder/builds/130695/steps/install-port/logs/stdio

[ryandesign]

I guess the problem is that ar is being given the absolute paths of each object file, and the path to the directory that MacPorts builds happen in is rather long to begin with. Could the Makefile call ar with relative paths to the objects, perhaps even just the filenames?

[barracuda156]

@NCIC-AlphaSparse Any chance of addressing this?