Hi Link, On Thu, Jan 29, 2026 at 11:55:46AM +0100, Link Mauve wrote: > I’m trying to build the kernel for the Nintendo Wii, using LLVM instead > of gcc, in order to bring Rust support to this architecture (and also > because my distribution doesn’t ship a cross-compiling gcc), but I get > this build issue near the end: > ``` > % make O=wii LLVM=1 ARCH=powerpc -j1 > make[1]: Entering directory '/home/linkmauve/dev/linux/wii' > GEN Makefile > CALL ../scripts/checksyscalls.sh > DESCEND objtool > INSTALL libsubcmd_headers > WRAP arch/powerpc/boot/dtbImage.wii > objcopy: Unable to recognise the format of the input file `vmlinux' > make[3]: *** [../arch/powerpc/boot/Makefile:394: > arch/powerpc/boot/dtbImage.wii] Error 1 > make[2]: *** [../arch/powerpc/Makefile:236: zImage] Error 2 > make[1]: *** [/home/linkmauve/dev/linux/Makefile:248: __sub-make] Error 2 > make[1]: Leaving directory '/home/linkmauve/dev/linux/wii' > make: *** [Makefile:248: __sub-make] Error 2 > ``` > > I believe it should use $(OBJCOPY) instead of objcopy, which is set to > llvm-objcopy, but couldn’t figure out where it is misconfigured. > > Thanks for your help!
It is the arch/powerpc/boot/wrapper script: https://github.com/ClangBuiltLinux/linux/issues/1601 I have a WIP series from long ago that may be a good starting point for getting something working but there were some errors I never got around to solving before having to shelve it for other issues: https://git.kernel.org/pub/scm/linux/kernel/git/nathan/linux.git/log/?h=wip/llvm-1-powerpc-boot-wrapper Maybe something I (or someone else) can get back to soon. Cheers, Nathan
