linux-mips build fix

[Ulrich Drepper]

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Franz Sirl wrote:

> Sorry, one word is missing, I meant it's available for runtime linking, 
> after all this was one of the reasons why HIDDEN was introduced after 
> all, or?

Local symbols are not added to the dynamic symbol table and therefore 
are not available at runtime.  LOCAL symbols can have whatever 
visibility they have, it doesn't matter at runtime.

The only difference is that if you mark a symbol with extern scope as 
hidden the compiler will be able to perform some optimizations.  In case 
of function calls this is only the case for platforms like SH4 where 
function calls are effectively variable references.  For all other 
platforms, I think, the linker is able to perform the optimizations.

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