Hey, Is it possible to cross-compile bpftool for arm64? I'm trying to do the same thing we do for perf, but bpftool Makefile doesn't seem to support CROSS_COMPILE variable, so one needs to pass CC=aarch64-linux-gnu-gcc as well. Problems do not end there as it requires EXTRA_LDFLAGS="-lz" too. With that I'm getting a long sad error about missing stuff from libbfd:
/lib/aarch64-linux-gnu/libbfd.a(elflink.o): In function `elf_link_add_object_symbols': /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:4938: undefined reference to `objalloc_free_block' /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:5185: undefined reference to `_sch_istable' /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:5185: undefined reference to `_sch_istable' /lib/aarch64-linux-gnu/libbfd.a(elflink.o): In function `bfd_elf_size_dynamic_sections': /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:6373: undefined reference to `lbasename' /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:6604: undefined reference to `lbasename' /lib/aarch64-linux-gnu/libbfd.a(elflink.o): In function `elf_output_implib': /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:11172: undefined reference to `xmalloc' /lib/aarch64-linux-gnu/libbfd.a(archures.o): In function `bfd_default_scan': /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/archures.c:1171: undefined reference to `_sch_istable' /build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/archures.c:1171: undefined reference to `_sch_istable' Binutils for arm64 are installed: $ dpkg -l | fgrep binutils ii binutils 2.28-5 amd64 GNU assembler, linker and binary utilities ii binutils-aarch64-linux-gnu 2.28-5 amd64 GNU binary utilities, for aarch64-linux-gnu target ii binutils-dev 2.28-5 amd64 GNU binary utilities (BFD development files) I'd love for it to work out of the box just like perf.
