llvm-objcopy: error: invalid output format: 'elf64-s390'

[emojifreak]

This can be a duplicate of #1524. s390 build fails at the final state as

  OBJCOPY arch/s390/boot/compressed/info.o
llvm-objcopy: error: invalid output format: 'elf64-s390'
make[2]: *** [arch/s390/boot/compressed/Makefile:55: arch/s390/boot/compressed/info.o] Error 1
  OBJCOPY arch/s390/boot/compressed/vmlinux.bin
  GZIP    arch/s390/boot/compressed/vmlinux.bin.gz
  OBJCOPY arch/s390/boot/compressed/piggy.o
llvm-objcopy: error: invalid output format: 'elf64-s390'
make[2]: *** [arch/s390/boot/compressed/Makefile:88: arch/s390/boot/compressed/piggy.o] Error 1
make[2]: Target 'arch/s390/boot/compressed/vmlinux' not remade because of errors.
make[1]: *** [arch/s390/boot/Makefile:69: arch/s390/boot/compressed/vmlinux] Error 2

This can be reproduced by

#!/bin/sh

KVER=5.16-rc3
LANG=C.UTF-8
export LANG
cd /var/tmp/tmp11s390

  cat >/tmp/config$$.txt <<EOF
CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT=n
CONFIG_KASAN=n
CONFIG_GCOV_KERNEL=n
CONFIG_COMPILE_TEST=n
CONFIG_TRIM_UNUSED_KSYMS=y
CONFIG_SHADOW_CALL_STACK=y
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y
CONFIG_INIT_STACK_ALL_ZERO=y
CONFIG_KVM=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_DYNAMIC=y

CONFIG_WERROR=n
CONFIG_RUNTIME_TESTING_MENU=n
CONFIG_XFS_FS=n
CONFIG_OVERLAY_FS=n
CONFIG_EMBEDDED=n

CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_DWARF5=y

CONFIG_ACPI=y
CONFIG_EFI_STUB=y
CONFIG_EFI=y
CONFIG_DMI=y
CONFIG_NUMA=y
CONFIG_MEMORY_HOTPLUG=y
CONFIG_HOTPLUG_PCI=y
CONFIG_HOTPLUG_PCI_PCIE=y
CONFIG_HOTPLUG_CPU=y

CONFIG_MARCH_Z15=y
CONFIG_TUNE_Z15=y
CONFIG_SCHED_TOPOLOGY=y
EOF


for a in s390; do
  rm -rf /var/tmp/tmp11s390/$a
  mkdir /var/tmp/tmp11s390/$a
  cd /var/tmp/tmp11s390/$a
  exec </dev/null >build-log-${KVER}-${a}.txt 2>&1
  set -xe
  tar zxf /var/tmp/linux-${KVER}.tar.gz
  cd linux-${KVER}

  sed -i 's/-O2/-O3/g' Makefile
  sed -i 's/-Os/-Oz/g' Makefile
  cp /tmp/config$$.txt .config
  make LLVM=1 LLVM_IAS=0 CROSS_COMPILE=s390x-linux-gnu- LD=s390x-linux-gnu-ld allmodconfig
  cat /tmp/config$$.txt >>.config

  yes '' |
    chrt --idle 0 nice -19 make --keep-going ARCH=$a LLVM=1 LLVM_IAS=0 CROSS_COMPILE=s390x-linux-gnu- LD=s390x-linux-gnu-ld KCFLAGS="-mllvm -polly-ast-use-context -mllvm -polly-invariant-load-hoisting -mllvm -polly-opt-fusion=max -mllvm -polly-run-inliner -mllvm -polly-vectorizer=stripmine -mllvm -polly-run-dce" all &
  exec </dev/null >/dev/null 2>&1
done 
wait

[nathanchance]

Yes, same issue as before, s390 does not appear to be supported with llvm-objcopy: https://github.com/llvm/llvm-project/blob/2f16b87b4b1d3fee07aff71a9bf79c3a8d514e7a/llvm/tools/llvm-objcopy/ConfigManager.cpp#L286-L319

This is reproducible with just defconfig:

$ make -skj"$(nproc)" ARCH=s390 CC=clang CROSS_COMPILE=s390x-linux-gnu- LLVM_IAS=0 OBJCOPY=llvm-objcopy distclean defconfig bzImage
...
llvm-objcopy: error: invalid output format: 'elf64-s390'
make[3]: *** [arch/s390/purgatory/Makefile:49: arch/s390/purgatory/purgatory.ro] Error 1
...

cc @uweigand in case I am missing something.

[nathanchance]

Same workaround as ld.lld: OBJCOPY=s390x-linux-gnu-objcopy.