https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66826

Rich Felker <bugdal at aerifal dot cx> changed:

           What    |Removed                     |Added
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                 CC|                            |bugdal at aerifal dot cx

--- Comment #5 from Rich Felker <bugdal at aerifal dot cx> ---
I think the issue is more complicated. Even if glibc were fixed not to crash,
code like the following:

return dlsym(RTLD_NEXT, "whatever");

would return the wrong result under tco when the caller's caller is in a
different dso. GCC probably needs a "notailcall" attribute to fix this, but
maybe there are workarounds glibc could do to prevent tco without needing a new
attribute...

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