[Bug dynamic-link/25669] New: Provide extra information when a found library file is not suitable

[Bug dynamic-link/25669] New: Provide extra information when a found library file is not suitable

[bugzilla.sourceware at me dot benboeckel.net]

https://sourceware.org/bugzilla/show_bug.cgi?id=25669

            Bug ID: 25669
           Summary: Provide extra information when a found library file is
                    not suitable
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: bugzilla.sourceware at me dot benboeckel.net
  Target Milestone: ---

Created attachment 12372
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12372&action=edit
Add logging for when ABI-tag is used to reject a found library

When logging with `LD_DEBUG=libs`, output is created which lists all the paths
which are tried in order. However, sometimes a path is listed as searched and
then the result ends up with a `File not found` error. This is confusing when a
found library was rejected for reasons of its contents. Architecture
differences are fine; that's more readily discoverable (though probably still
worth logging about). I'm mostly interested in avoiding the confusion from the
`.note.ABI-tag` checking that is done. As an example, this issue:
<https://github.com/Microsoft/WSL/issues/3023>.

I have a (currently untested) patch (attached) which adds information for this
case. Is it recommended to find other locations and log about those rejection
cases as well or is just this instance fine?

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[Bug dynamic-link/25669] Provide extra information when a found library file is not suitable

[bugzilla.sourceware at me dot benboeckel.net]

https://sourceware.org/bugzilla/show_bug.cgi?id=25669

--- Comment #1 from Ben Boeckel <bugzilla.sourceware at me dot benboeckel.net> ---
I've now tested this patch and it appears to work as I'd expect:

   2750004:       trying file=/home/boeckb/misc/code/sb/too-old/./libl.so
   2750004:         (insufficient OS version requirements: 5050d < 60000)

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[Bug dynamic-link/25669] Provide extra information when a found library file is not suitable

[bugzilla.sourceware at me dot benboeckel.net]

https://sourceware.org/bugzilla/show_bug.cgi?id=25669

--- Comment #2 from Ben Boeckel <bugzilla.sourceware at me dot benboeckel.net> ---
Created attachment 12510
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12510&action=edit
Patch which adds rejection reasons to other rejection codepaths

I've added reasons for rejects to the other codepaths.

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