[Bug ld/19617] New: ELF: Allow -E to work without -pic/-pie/-shared in the absence of undefined symbols

[hpa at zytor dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19617

            Bug ID: 19617
           Summary: ELF: Allow -E to work without -pic/-pie/-shared in the
                    absence of undefined symbols
           Product: binutils
           Version: 2.27 (HEAD)
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hpa at zytor dot com
  Target Milestone: ---

If neither -pic, -pie, or -shared is specified, *and* there are no undefined
symbols in the executable, ld produces no dynamic sections.  However, if -E is
specified, the executable is supposed to export its symbols to modules loaded
in the future.

This configuration is common in embedded environments, including boot loaders. 
The current workaround is to use -pie, but that generates a manifest .rel.dyn
section which is pure waste if -pie isn't actually required.

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