Update to enable clang cross compile

[Bacon-O]

clang-cross-compile

In customation added _llvm_target_arch=""

Configure prepare to read _llvm_target_arch

blank --> no change/default

"x86_64-linux-gnu" --> enables cross compiling for x86_64-linux-gnu

[AdelKS]

Hey!

So, from what I am understanding, the -march=foo check if foo applies to your machine makes cross-compiling not work since, well, it's not your machine. And you are adding a workaround for that.

What else do you need to edit for cross compiling to work with linux-tkg ?

[Bacon-O]

Hey!

So, from what I am understanding, the -march=foo check if foo applies to your machine makes cross-compiling not work since, well, it's not your machine. And you are adding a workaround for that.

What else do you need to edit for cross compiling to work with linux-tkg ?

I was looking at this a while ago and yes there was more I had to set. I was cross compiling X86 on ARM64. It was a finicky environment I had to setup.

This is on my todo list to revisit so when I do will update what else is needed.