effect of -fPIC on code speed

Andrew Haley aph@redhat.com
Wed Sep 22 05:11:00 GMT 2010


On 20/09/10 17:10, Miles Bader wrote:
> Andrew Haley <aph@redhat.com> writes:
>> It's actually part of the C standard: there may only be one definition
>> of any symbol, whether that symbol refers to a function or to data.  So,
>> for every visible symbol X in a program, &X must be the same, no matter
>> who is asking.  All manner of things break without this.
> 
> Are symbols in a shared object loaded with e.g. dlopen "visible" (in the
> sense of being unified with symbols in the executable, not visible via a
> special lookup like dlsym)?

That depends on the options you use.  man dlopen explains it.

Andrew.



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