[Bug binutils/21212] New: Improve "Empty loadable segment detected" warning

[binutils at ineranves dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=21212

            Bug ID: 21212
           Summary: Improve "Empty loadable segment detected" warning
           Product: binutils
           Version: 2.29 (HEAD)
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: binutils at ineranves dot de
  Target Milestone: ---

Created attachment 9868
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9868&action=edit
git patch

This warning is currently shown (among other situations) when a segment has
p_filesz = 0 and a p_memsz > 0 , which is a valid setup to initialize flash
memory of embedded systems with zeros and explicitly mentioned in the ELF
specification as a valid use case.
The attached patch limits the warning to situations when p_filesz > 0 - which
happens when a segment is truncated to 0 length by an objcopy operation that
removes all of the segment's sections.

When the warning is shown, it should identify the segment it is talking about.
The attached patch includes the p_vaddr of the segment for that purpose.

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