Artem-B wrote:
> Summary: Currently, `-Xarch_` is used to forward argument specially to
> certain toolchains. Currently, this is only supported by the Darwin
> toolchain. We want to be able to use this generically, and for offloading
> too. This patch moves the handling out of the Darwin Toolchain and places it
> in the `getArgsForToolchain` helper which is run before the arguments get
> passed to the tools.
I think this could use some editing. `-Xarch` is intended to set flags per
*target*. Same toolchain may handle more than one target. Perhaps rephrase
along the lines of "forward argument to the toolchain used for the given target
architecture"?
> this is only supported by the Darwin toolchain.
This is the confusing part. I'm pretty sure `-Xarch_host` `-Xarch_device` and
variety of `-Xarch_{gfx,sm}..` variants are also supported by HIP/Cuda
toolchains right now.
IMO, a better way to describe the situation is that MachO is the last remaining
special case implementation of Xarch and the patch folds it into a common
`Xarch` handling that's already used by offloading toolchains.
https://github.com/llvm/llvm-project/pull/125421
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