cpu: Fix build for MacOS.
* The value of build environment variable KVM_ISA is serialized into
the generated file `kvm_isa.hh'. This value should be a string, but on
hosts where the KVM headers are not available, the default `None` is
inserted. Changed the default value to the string `""` in this case.
* Added missing include for `std::array`.
Change-Id: I651122cc46fc9c0757f592b05f4b4cab285cb91f
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/57889
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed
