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Solodrai wrote: > On 12/24/25 5:01 PM, kernel test robot wrote: >> tree: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master >> head: f14cdb1367b947d373215e36cfe9c69768dbafc9 >> commit: 522397d05e7d4a7c30b91841492360336b24f833 [8/9] resolve_btfids: Change in-place update with raw binary output >> config: nios2-randconfig-001-20251224 (https://download.01.org/0day-ci/archive/20251225/202512250932.X7mdviuH-lkp@intel.com/config) >> compiler: nios2-linux-gcc (GCC) 11.5.0 >> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251225/202512250932.X7mdviuH-lkp@intel.com/reproduce) >> >> If you fix the issue in a separate patch/commit (i.e. not just a new version of >> the same patch/commit), kindly add following tags >> | Reported-by: kernel test robot >> | Closes: https://lore.kernel.org/oe-kbuild-all/202512250932.X7mdviuH-lkp@intel.com/ >> >> All errors (new ones prefixed by >>): >> >> Complex, interval and imaginary float types are not supported >> Error while encoding BTF. > > Hi Dinh, Alan, > > Not sure why this has surfaced only now, but it appears that kernel > build with ARCH=nios2 and CONFIG_DEBUG_INFO_BTF=y has been broken for > a long time. > > I tried the following revisions: > - bpf-next @ 522397d05e7d as in bug report > - bpf-next @ 014e1cdb5fad without the gen-btf.sh patch > - v6.18 > - v6.17 > - v6.12 (~1y ago) > > All fail with the same error in pahole [1]: > > Complex, interval and imaginary float types are not supported > Encountered error while encoding BTF. > > I used v1.24 in most experiments, the default debian:bookworm > installation. Upgrading pahole to v1.31 doesn't change this behavior. > > I also stumbled on a phoronix article [2], saying Nios II support has > ended with GCC 15. Is it actively supported in Linux? > > Not clear to me if anything needs to be fixed here. I'd appreciate any input. > > Thanks. hi Ihor, it's probably worth separating the issue of complex/interval/imaginary support from nios2 support. In terms of the latter, if the breakage is old I agree that it is at least a lower priority. Did you figure out where the problematic type comes from? Might be a workaround we could apply there. It also does raise a valid issue about supporting a larger menu of floating-point types supported by GNU C/C++. To do so it looks like we'd need 2 bits to support the range of possibilities - standard floating point - complex floating point - interval floating point - imaginary floating point Is there interest in supporting these? Thanks! Alan > > [1] https://git.kernel.org/pub/scm/devel/pahole/pahole.git/tree/btf_encoder.c?h=v1.31#n469 > [2] https://www.phoronix.com/news/GCC-15-Drops-Altera-Nios-II > > >>>> FAILED: load BTF from .tmp_vmlinux1.BTF.1: No such file or directory >> > >