The question is in fact: what is a section for GCC? Is it just a way to
 group functions together to improve memory cache efficiency; or is the
 GCC user authorised to use sections to forbid access to some functions
 at link time?

For user-declared ("attribute") sections, GCC just outputs
the necessary assembler magic, and that's it.  Anything else
is handled by your binary format tools, if at all.


Segher

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