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I ran into link errors complaining about references to hidden symbol _Unwind_GetIP from a DSO.
It turns out unwind-dw2.c is compiled with -fvisibility=hidden for the static library case (but not for the shared library case).
In my link, I was using the libgcc.a (for that particular platform I don't use libgcc.so). So the linker complained.
Anyways, -fvisibility=hidden is needed for libgcc.a (This was done a different way in the past, by editing the assembly file) because otherwise, you can have the same symbol exported from two different shared libraries which is bad.
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