[Bug target/81708] The x86 stack canary location should be customizable

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81708

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
                 CC|                            |aoliva at gcc dot gnu.org
         Resolution|FIXED                       |---

--- Comment #15 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Uroš,

stack-prot-sym.c fails on ia32 with PIC/PIE: the address/value of my_guard is
loaded from the GOT, instead of appearing as %gs:my_guard.

After being confused by the expectation that my_guard should be a LE TLS
symbol, I'm coming to the conclusion that my expectation was incorrect, and it
is indeed supposed to be a plain offset, so the code is correct, if not as
efficient as on PDC.  Does that sound right?

I'm undecided as to whether avoiding the GOT reference, and requiring the
symbol to be usable as a link-time constant, would be desirable/doable. 
Thoughts?