This patch introduces a new option -offloading-target-id for HIP.
Offloading target id is a generalization of CUDA/HIP GPU arch.
It is a device name plus optional feature strings delimited by
plus sign, e.g. gfx906+xnack+sram-ecc. GPU arch is the degenerated
case of offloading target id where there is no feature string. For
each device name, there is a limited number of predefined feature
strings which are allowed to show up in offloading target it. When
feature strings show up in offloading target id, they must follow
predefined order. Therefore offloading target id is a unique id
to convey device name and enabled target feature.
For each offloading target id, a device compilation will be performed
by the driver. If the device compilation results in a device object,
the offloading target id is used in the fat binary to uniquely identify
the device object. This is to allow runtime to load the device
object suitable for the device configuration.
This patches changes HIP action builder to handle -offloading-target-id
option. It generalizes GPUArchList in CUDA/HIP action builder so that
it can handle both CUDA GPU arch and HIP offloading target id. It changes
HIP toolchain to handle offloading target id as bound arch.
This patch is NFC for CUDA toolchain.