Initial support for compiling natively on macOS#131
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- Introduce a Makefile variable `MACOS_BUILDER`. Default is to still use the krunvm-based approach; set `MACOS_BUILDER` to `native` to use the new native compilation approach. - Default to an LLVM-based toolchain when compiling natively on macOS. Allow the user to set the basename of tools. Users can also set their `PATH` as needed to prioritize GNU variants of tools, which is needed for e.g. sed, tar. - Vendor `elf.h` (derived from GNU libc), `byteswap.h`, `endian.h`, which are not available on macOS and are needed to compile the Linux kernel. - The Linux kernel build process expects a case-sensitive file system. Signed-off-by: Caleb Xu <caxu@redhat.com>
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MACOS_BUILDER. Default is to still use the krunvm-based approach; setMACOS_BUILDERtonativeto use the new native compilation approach.PATHas needed to prioritize GNU variants of tools, which is needed for e.g. sed, tar.elf.h(derived from GNU libc),byteswap.h,endian.h, which are not available on macOS and are needed to compile the Linux kernel.Apart from vendoring the missing host headers above and adjusting the
HOSTCFLAGSdue to macOS also defining a conflictinguuid_t, there wasn't any patching needed on the kernel source. There are still some warnings along the way; I think there may be some downstream patches available which may not be backported to the 6.12 branch (or were submitted but never accepted upstream at all). Not sure how much we care about the warnings.