Comment 5 for bug 1746765

seen with 4.13 and 4.15 kernel builds, works with the 2.29 branch, aarch64-linux-gnu.
log at
https://launchpadlibrarian.net/355195922/buildlog_ubuntu-bionic-arm64.linux_4.15.0-6.7_BUILDING.txt.gz

  LD vmlinux.o
  MODPOST vmlinux.o
ld: arch/arm64/kernel/head.o: relocation R_AARCH64_ABS32 against `_kernel_offset_le_lo32' can not be used when making a shared object
ld: arch/arm64/kernel/efi-entry.stub.o: relocation R_AARCH64_ABS32 against `__efistub_stext_offset' can not be used when making a shared object
arch/arm64/kernel/head.o: In function `kimage_vaddr':
(.idmap.text+0x0): dangerous relocation: unsupported relocation
arch/arm64/kernel/head.o: In function `__primary_switch':
/<<PKGBUILDDIR>>/arch/arm64/kernel/head.S:772:(.idmap.text+0x340): dangerous relocation: unsupported relocation
/<<PKGBUILDDIR>>/arch/arm64/kernel/head.S:772:(.idmap.text+0x348): dangerous relocation: unsupported relocation
/<<PKGBUILDDIR>>/Makefile:1026: recipe for target 'vmlinux' failed
make[2]: *** [vmlinux] Error 1