Cross compile GMP for Apple Silicon

[Pierre Chatelier]

>> I tried to compile GMP on a x86_64 buidl machien to target apple silicon systems:
>> ./configure --enable-fat --build=x86_64-apple-darwin13.0.0 --host=arm64-apple-darwin
>> 
>> But this resulst in assembler code not being recognized :
>> tmp-add_n.s:71:10: error: unknown token in expression
>> cmp x4, #1
>> 
>> I assume that GMP is not yet ready for the aamd64 architecture (or whatever its name)
>> Are there plans for that ? (I could not find that information while browsing gmplib.org <http://gmplib.org/>)
> 
> You don't mention what version of GMP you tried. There have been discussions related to arm64-apple-darwin in the past few months, check this list or gmp-bugs, and people did succeed with snapshots from master at the time.
The latest release 6.2.1. I did not try develop branches.
Ok, so this is a work in progress.

> 
>> Secondary question : will the configure script support Universal binaries natively, or will it end to the developer's responsability to merge x_86_64 and aamd64 builds ? (lipo -create ...)
> 
> Most likely the packager's responsibility, doing it directly would complicate things a lot for no gain.
OK