[Bug ld/31906] libdep.so plugin escaping with `\` has bugs, can segfault

[me at harmenstoppels dot nl]

https://sourceware.org/bugzilla/show_bug.cgi?id=31906

--- Comment #3 from Harmen Stoppels <me at harmenstoppels dot nl> ---
Hi Nick, you're right. But there are larger issues, such as the fact that `\`
isn't escaping anything, it's a "skipped character".

I submitted a patch that addresses the issues reported here as well as others
https://sourceware.org/pipermail/binutils/2024-June/134936.html.

I marked that as RFC because it has a small change of behavior: treat \ as
literal character. That's justified by the fact that nobody could possibly have
relied on it because of these off by one errors.

I also started a discussion about the plugin's usefulness in general here
https://sourceware.org/pipermail/binutils/2024-June/134962.html, it could be
better.

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