[Bug binutils/20751] New: Enhancement: make 'nm' to show symbol versions; improve documentation on symbol versions for 'objdump' and 'readelf'; (?) standardize version display format

[sasha2048 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20751

            Bug ID: 20751
           Summary: Enhancement: make 'nm' to show symbol versions;
                    improve documentation on symbol versions for 'objdump'
                    and 'readelf'; (?) standardize version display format
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: sasha2048 at gmail dot com
  Target Milestone: ---

1. There is no support for displaying symbol version in 'nm'.
E.g. output of 'nm -D […]/libc.so.6' shows something like:
    […]
    0000000000143230 T realpath
    00000000000453c0 T realpath
    […]
which is pretty unclear.
I understand that it may be unreasonable to break current display format, but
introducing some new key like '--with-symbol-versions' would be nice.

2. While 'objdump' and 'readelf' are able to display symbol version, there is
no mention about it in documentation.
'man objdump' says: "After the section name comes another field, a number,
which for common symbols is the alignment and for other symbol is the size.
Finally the symbol's name is displayed." But when objdumping shared object with
symbol versions, 5th column is silently inserted between symbol size and symbol
name.
'readelf' displays names of symbols with version as 'address@hidden' or
'symbol@@version'. But there is no mention about that in documentation. Neither
about the fact of displaying version itself, nor about difference between '@'
and '@@'.

3. This point may be superfluous. But why not to make 'objdump' to display
version information in same way as 'readelf'? I.e. 'symbol@@version' and
'address@hidden' instead of 'version symbol' and '(version) symbol'.

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