[Bug ld/27093] New: should BFD not produce `-z norelro ignored` when target emulation is unsupported?

[ndesaulniers at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27093

            Bug ID: 27093
           Summary: should BFD not produce `-z norelro ignored` when
                    target emulation is unsupported?
           Product: binutils
           Version: 2.35.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: ndesaulniers at google dot com
                CC: amodra at gmail dot com, i at maskray dot me, maskray at 
google dot com
  Target Milestone: ---

Follow up to LKML discussion:
https://lore.kernel.org/lkml/20201214231827.GG8873@bubble.grove.modra.org/

And LLD bug:
https://bugs.llvm.org/show_bug.cgi?id=48549

It looks like BFD and LLD disagree about which aarch64 emulation targets to set
relro program headers for.  For the Linux kernel, we'd like to explicitly
disable relro, regardless of target emulation mode (The kernel tries to use
-maarch64elf, but will fall back to -maarch64linux), and linker.

I can understand warning if `-z relro` (enabling) was set, but unsupported. But
warning on `-z norelro` (disabling) feels like a papercut.

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