[Bug binutils/27128] nm -P portable output format regression

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27128

--- Comment #6 from Alan Modra <amodra at gmail dot com> ---
@@ and @ have different meanings in symbol definitions.  sym@@ver specifies a
definition of sym that satifies references to plain sym as well as sym@ver. 
sym@ver2 in a definition only satifies references to sym@ver2.  If the tools of
which you speak really need to match up symbol definitions to references then
they would not have worked properly when multiple versions of a given symbol
existed, prior to nm reporting versions.  So I think your tools need updating,
unless they are only expected to work in simple use cases.

That said, pr25708 also had a request for a way to turn off reporting versions,
and at one stage nm had an option to conditionally display version info.  H.J.,
why was the version info made unconditional?

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