[Bug ld/25882] .gnu.attributes are not checked for shared libraries

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=25882

--- Comment #9 from Rich Felker <bugdal at aerifal dot cx> ---
OK, I should have read more before commenting. My comments in particular
pertain specifically to powerpc64 although other archs might be affected too. I
see that the error was downgraded to a warning since the breaking change first
appeared in a release, which is an improvement, but it's still likely going to
lead to people doing very wrong things based on that warning. For example,
Alpine Linux got this merge request:

https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/13547

which would have created a broken Frankenstein-ABI to make the error message go
away rather than fixing the problem. I can envision folks doing the exact same
sort of thing when they see a warning, because I get/see wrong "warning fix"
patches all the time for compiler warnings.

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