clang: enable the LoongArch target in in-tree llvm builds

[zhaoxiaoqiang007_gmail.com]

Summary

Enable the LoongArch target, assembler parser and disassembler.

Signed-off-by: Xiaoqiang Zhao <[e-mail]>

[emaste]

Do we need a change in share/mk/src.opts.mk? Adding LLVM_TARGET_LOONGARCH to __DEFAULT_NO_OPTIONS for now?

src.conf.5 will need to be regenerated as well

[dim]

I'm generally fine with this, but it is there a concrete plan to add LoongArch support for the base system? Otherwise I would advise to use one of the llvm ports for bringup first.

Btw, this would also need adjustments in share/mk/src.opts.mk to add the MK_LLVM_TARGET_LOONGARCH make macro.

[zhaoxiaoqiang007_gmail.com]

In D59899#1374726, @emaste wrote:

Do we need a change in share/mk/src.opts.mk? Adding LLVM_TARGET_LOONGARCH to __DEFAULT_NO_OPTIONS for now?

src.conf.5 will need to be regenerated as well

Disable it for now is make sense

[emaste]

is there a concrete plan to add LoongArch support for the base system?

There's a lot of work (in review) to add support. I suspect we'll be iterating on it for some time, but IMO it's reasonable to have the toolchain infrastructure in the base system now.

[zhaoxiaoqiang007_gmail.com]

In D59899#1375377, @emaste wrote:

is there a concrete plan to add LoongArch support for the base system?

There's a lot of work (in review) to add support. I suspect we'll be iterating on it for some time, but IMO it's reasonable to have the toolchain infrastructure in the base system now.

agree, as it already works well

[dim]

I just removed the remnants of the Mips target in rGb5d1e0c5a4929e2be3bc58aad8e5b707860ec0fd, please rebase.

[zhaoxiaoqiang007_gmail.com]

In D59899#1376284, @dim wrote:

I just removed the remnants of the Mips target in rGb5d1e0c5a4929e2be3bc58aad8e5b707860ec0fd, please rebase.

got it

[zhaoxiaoqiang007_gmail.com]

rebase main
disable llvm LoongArch on other build target

[dim]

I will commit this with a few small changes.

[emaste]

LGTM