[Bug ld/31067] New: symbols eliminated by --gc-sections still trigger warnings for gnu.warning.SYM

[rearnsha at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31067

            Bug ID: 31067
           Summary: symbols eliminated by --gc-sections still trigger
                    warnings for gnu.warning.SYM
           Product: binutils
           Version: 2.42 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: rearnsha at sourceware dot org
  Target Milestone: ---

Created attachment 15222
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15222&action=edit
bug demonstrator

If a function with an associated .gnu.warning.<function> section is dragged
into a link set then the warning will be emitted even if <function> is later
discarded entirely by --gc-sections.  See the attached testcase as a trivial
example.  This is a reduction from a real-world example where the whole printf
functionality was eliminated from a program, but the warning from _write in
newlib's libnosys.a was still emitted.

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