On Wed, Sep 16, 2020 at 02:47:33PM -0500, Seth Forshee wrote: > The requirement to build resolve_btfids whenever CONFIG_DEBUG_INFO_BTF > is enabled breaks some cross builds. For example, when building a 64-bit > powerpc kernel on amd64 I get: > > Auto-detecting system features: > ... libelf: [ [32mon[m ] > ... zlib: [ [32mon[m ] > ... bpf: [ [31mOFF[m ] > > BPF API too old > make[6]: *** [Makefile:295: bpfdep] Error 1 > > The contents of tools/bpf/resolve_btfids/feature/test-bpf.make.output: > > In file included from /home/sforshee/src/u-k/unstable/tools/arch/powerpc/include/uapi/asm/bitsperlong.h:11, > from /usr/include/asm-generic/int-ll64.h:12, > from /usr/include/asm-generic/types.h:7, > from /usr/include/x86_64-linux-gnu/asm/types.h:1, > from /home/sforshee/src/u-k/unstable/tools/include/linux/types.h:10, > from /home/sforshee/src/u-k/unstable/tools/include/uapi/linux/bpf.h:11, > from test-bpf.c:3: > /home/sforshee/src/u-k/unstable/tools/include/asm-generic/bitsperlong.h:14:2: error: #error Inconsistent word size. Check asm/bitsperlong.h > 14 | #error Inconsistent word size. Check asm/bitsperlong.h > | ^~~~~ > > This is because tools/arch/powerpc/include/uapi/asm/bitsperlong.h sets > __BITS_PER_LONG based on the predefinied compiler macro __powerpc64__, > which is not defined by the host compiler. What can we do to get cross > builds working again? could you please share the command line and setup? thanks, jirka
