offset is outside the section

[nickdesaulniers]

on linux-next, it seems that ARCH=arm allyesconfig builds spew these error from LLD:

ld.lld: error: arch/arm/crypto/curve25519-glue.o:(__ksymtab_strings): offset is outside the section
ld.lld: error: arch/arm/crypto/chacha-glue.o:(__ksymtab_strings): offset is outside the section
ld.lld: error: arch/arm/mm/dma-mapping.o:(.rodata.str1.1): offset is outside the section
ld.lld: error: arch/arm/mm/mmu.o:(.rodata.str1.1): offset is outside the section
ld.lld: error: arch/arm/crypto/poly1305-glue.o:(__ksymtab_strings): offset is outside the section
ld.lld: error: init/do_mounts.o:(.rodata.str1.1): offset is outside the section
...

It looks like there's only two sections that produce the warning, __ksymtab_strings and .rodata.str1.1.

$ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make LLVM=1 -j71 allyesconfig
$ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make LLVM=1 -j71

[nathanchance]

Presumably, this is reproducible with ToT LLVM?

I can test this later tonight (currently testing a few other things in my box).

[nathanchance]

Uhh, I don't think ARCH=arm allyesconfig works with ld.lld because it is big endian by default, which is not supported by ld.lld.

$ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- LLVM=1 O=out/arm distclean allyesconfig all
ld.lld: error: unknown argument '--be8'
...
ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected
ld.lld: error: arch/arm/common/krait-l2-accessors.o:(__ksymtab_strings): offset is outside the section
...
ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected
ld.lld: error: arch/arm/common/mcpm_entry.o:(.rodata.str1.1): offset is outside the section
...

$ rg ENDIAN out/arm/.config
785:CONFIG_CPU_BIG_ENDIAN=y
786:CONFIG_CPU_ENDIAN_BE8=y
814:CONFIG_ARCH_SUPPORTS_BIG_ENDIAN=y
8064:CONFIG_FB_FOREIGN_ENDIAN=y
8065:CONFIG_FB_BOTH_ENDIAN=y
8066:# CONFIG_FB_BIG_ENDIAN is not set
8067:# CONFIG_FB_LITTLE_ENDIAN is not set
9254:CONFIG_USB_OHCI_LITTLE_ENDIAN=y
10376:CONFIG_VHOST_CROSS_ENDIAN_LEGACY=y

I see errors of that nature on Linux 5.7 and LLVM 10.0.1 so it is not a recent change.

Forcing little endian works just fine:

$ echo "CONFIG_CPU_BIG_ENDIAN=n" > le.config

$ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- KCONFIG_ALLCONFIG=le.config LLVM=1 O=out/arm distclean allyesconfig all
...

It is entirely possible that something like d8e85e1 needs to happen for ARCH=arm as well so that it defaults to little endian, this is not the first time something like this has come up. I am just in the habit of forcing little endian for allyesconfig that I do not give it much thought.

[nickdesaulniers]

Maybe this is a papercut we could make less painful by having LLD warn for unsupported triples? Wont fix the issue, but would make more sense.

[nickdesaulniers]

dup of #965