[Bug ld/29654] New: ld: add -w to suppress warnings

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29654

            Bug ID: 29654
           Summary: ld: add -w to suppress warnings
           Product: binutils
           Version: 2.40 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

Apple ld64 and llvm-project ld64.lld support -w to suppress warnings. -w was
picked likely because compiler drivers use -w to suppress warnings.
I think -w mildly benefits GNU ld/gold as well.

With --noinhibit-exec, we downgrade errors to warnings. When analyzing a large
executable with relocation overflow issues, we may use --noinhibit-exec
--emit-relocs
to get relocations and an output file despite relocation overflow issues.
Since we know the output otherwise does not link, the warnings are not useful.
If we have -w, we can add -w to not see the unuseful warnings.

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