[Bug ld/29540] New: ld ppc64: unneeded R_PPC64_NONE in .rela.dyn when linking Linux vdso

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29540

            Bug ID: 29540
           Summary: ld ppc64: unneeded R_PPC64_NONE in .rela.dyn when
                    linking Linux vdso
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

This should be reproducible with many Linux versions, but I have just checked
some recent commits, e.g. dcf8e5633e2e69ad60b730ab5905608b756a032f today

% git remote -v | grep origin
origin  https://github.com/torvalds/linux (fetch)
origin  https://github.com/torvalds/linux (push)
% make O=/tmp/linux/ppc64le ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu-
-j60 defconfig all
% readelf -Wr /tmp/linux/ppc64le/arch/powerpc/kernel/vdso/vdso64.so.dbg

Relocation section '.rela.dyn' at offset 0x14f0 contains 4 entries:
    Offset             Info             Type               Symbol's Value 
Symbol's Name + Addend
0000000000000000  0000000000000000 R_PPC64_NONE                              0
0000000000000000  0000000000000000 R_PPC64_NONE                              0
0000000000000000  0000000000000000 R_PPC64_NONE                              0
0000000000000000  0000000000000000 R_PPC64_NONE                              0

The linker script is innocent. I don't reproduce the problem with other ports
(though I know that the riscv port produces R_RISCV_NONE in certain scenarios)

make O=/tmp/linux/x86_64 -j60 defconfig all && readelf -Wr
/tmp/linux/x86_64/arch/x86/entry/vdso/vdso64.so
make O=/tmp/linux/aarch64 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1
-j60 all && readelf -Wr /tmp/linux/aarch64/arch/arm64/kernel/vdso/vdso.so
make O=/tmp/linux/riscv64 ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- -j60
defconfig all && readelf -Wr /tmp/linux/riscv64/arch/riscv/kernel/vdso/vdso.so
make O=/tmp/linux/s390x ARCH=s390 CROSS_COMPILE=s390x-linux-gnu- -j60 defconfig
all && readelf -Wr /tmp/linux/s390x/arch/s390/kernel/vdso64/vdso64.so

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