On 12/18, Ivan Babrou wrote: > 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 Ah, we do "include ../../scripts/Makefile.include" on the first line of the Makefile, it should define proper CC, but this can override it.
Did you try removing it? Or changing to 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 EXTRA_LDFLAGS are added too early :-( Looking at your command: gcc ... -lz -liberty -o bpftool map_perf_ring.o ... .../libbpf.a -lelf -lbfd -lopcodes. Try changing LIBS in the tools/bpf/bpftool/Makefile to: LIBS = -lelf -lbfd -liberty -lz -lopcodes $(LIBBPF) This is, again, a semi-known issue, I need that perf patch to get into the tree first. It's probably time to ping that original thread, it's been quit for about a month... > /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.
