[Bug ld/25749] PC relocation against SHN_ABS symbol in PIE or shared library should be disallowed

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=25749

Fangrui Song <i at maskray dot me> changed:

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                 CC|                            |i at maskray dot me

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
Thanks for opening this issue.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94391#c6

It is incorrect to reference a non-preemptible SHN_ABS symbol with a PC
relative relocation in a PIC (-shared or -pie) link. This is non-representable
due to ASLR (load base not fixed at link time)

There are several ways that the symbol will be considered non-preemptible:

* -pie
* -Bsymbolic
* STV_HIDDEN/STV_INTERNAL/STV_PROTECTED
* --dynamic-list exists but does not list the symbol
* VER_NDX_LOCAL

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