Let me correct myself. The problematic symbol in the situation here is
"ff_pd_1", a global variable. It's declared with the attribute
visibility("hidden"). The symbol isn't exported. Knowing this, gcc apparently
doesn't generate PIC code for accessing it even when you add -fPIC.
By default, gcc assumes your executable isn't going to be larger than 2 gig.
Executables are normally loaded within the first 2 gig of the address space, so
any global variable ought to be reachable by a 32-bit address. This doesn't
work for shared libraries. The address needs to be 64-bit.
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