On Tue, Dec 18, 2018 at 4:30 PM Stanislav Fomichev <s...@fomichev.me> wrote: > > On 12/18, Ivan Babrou wrote: > > 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 > What error are you getting? Can you try setting the ARCH: > make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
It just fails with the following: $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Auto-detecting system features: ... libbfd: [ on ] ... disassembler-four-args: [ OFF ] make[1]: Entering directory '/tmp/build/linux-4.19.10/tools/lib/bpf' make[1]: Leaving directory '/tmp/build/linux-4.19.10/tools/lib/bpf' LINK bpftool /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /usr/bin/ld: /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a(libbpf-in.o): Relocations in generic ELF (EM: 183) /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a: error adding symbols: File in wrong format collect2: error: ld returned 1 exit status Makefile:96: recipe for target 'bpftool' failed make: *** [bpftool] Error 1 The reason is that CROSS_COMPILE doesn't do anything: $ grep ^CC Makefile CC = gcc > [..] > > requires EXTRA_LDFLAGS="-lz" too. With that I'm getting a long sad > > error about missing stuff from libbfd: > For this I've been waiting for the following patch to be merged > first: https://lkml.org/lkml/2018/11/16/243 > Basically, on some platforms, -lbfd requires -liberty and/or -lz. > We need to test each case individually for bpftool, but the feature > tests are semi-broken without the patch above. Adding -liberty doesn't help: $ make ARCH=arm64 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CC=aarch64-linux-gnu-gcc EXTRA_LDFLAGS="-lz -liberty"^C (reverse-i-search)`QUI': make -C /tmp/build/linux-4.19.10/tools/bpf/bpftool KBUILD_BUILD_TIMESTAMP="Mon Sep 27 00:00:00 UTC 2010" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CC=aarch64-linux-gnu-gcc EXTRA_LDFLAGS="-lz -liberty" O=/tmp/build/arm64/bpftool DESTDIR=/tmp/build/arm64/debian/bpftooltmp/usr install LOCALVERSION=-cloudflare-2018.12.6-dev QUIET_LINK= ^CIET_CC= ivan@36s338:/tmp/build/linux-4.19.10/tools/bpf/bpftool$ make ARCH=arm64 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CC=aarch64-linux-gnu-gcc EXTRA_LDFLAGS="-lz -liberty" QUIET_LINK= QUIET_CC= Auto-detecting system features: ... libbfd: [ on ] ... disassembler-four-args: [ OFF ] make[1]: Entering directory '/tmp/build/linux-4.19.10/tools/lib/bpf' make[1]: Leaving directory '/tmp/build/linux-4.19.10/tools/lib/bpf' aarch64-linux-gnu-gcc -O2 -W -Wall -Wextra -Wno-unused-parameter -Wshadow -Wno-missing-field-initializers -DPACKAGE='"bpftool"' -D__EXPORTED_HEADERS__ -I/tmp/build/linux-4.19.10/kernel/bpf/ -I/tmp/build/linux-4.19.10/tools/include -I/tmp/build/linux-4.19.10/tools/include/uapi -I/tmp/build/linux-4.19.10/tools/lib/bpf -I/tmp/build/linux-4.19.10/tools/perf -DBPFTOOL_VERSION='"4.19.10"' -DCOMPAT_NEED_REALLOCARRAY -lz -liberty -o bpftool map_perf_ring.o xlated_dumper.o perf.o prog.o btf_dumper.o common.o cgroup.o main.o json_writer.o cfg.o map.o jit_disasm.o disasm.o /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a -lelf -lbfd -lopcodes /tmp/build/linux-4.19.10/tools/lib/bpf/libbpf.a /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' ... /lib/aarch64-linux-gnu/libopcodes.a(arm-dis.o): In function `print_insn_neon': /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:4452: undefined reference to `floatformat_ieee_single_little' /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:4452: undefined reference to `floatformat_ieee_single_little' /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:4452: undefined reference to `floatformat_to_double' /lib/aarch64-linux-gnu/libopcodes.a(arm-dis.o): In function `parse_disassembler_options': /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:6177: undefined reference to `_sch_istable' /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:6177: undefined reference to `_sch_istable' /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:6180: undefined reference to `_sch_istable' /lib/aarch64-linux-gnu/libopcodes.a(arm-dis.o): In function `print_insn': /build/binutils-YyZpUv/binutils-2.28/builddir-single/opcodes/../../opcodes/arm-dis.c:6754: undefined reference to `_sch_istable' collect2: error: ld returned 1 exit status Makefile:96: recipe for target 'bpftool' failed make: *** [bpftool] Error 1 > > > > /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.
