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Re: PIC is wasteful

On 24/06/11 09:09, Agner Fog wrote:
> 
> When I compile with -fno-exceptions I don't get this error, but instead 
> I get:
> 
> relocation R_X86_64_32 against `a local symbol' can not be used when 
> making a shared object; recompile with -fPIC
> 
> This 'local symbol' is my function in section .eh_frame. Why does it 
> make .eh_frame when I turn off exception handling?

It's an ABI requirement for thread cancellation.

> A further problem in 64 bit mode is that even though I compile with 
> -mcmodel=medium, I get:
> 
> relocation R_X86_64_32 against `VariableName' can not be used when 
> making a shared object; recompile with -fPIC
> 
> Why does it make 32 bit absolute addresses when I specify 
> -mcmodel=medium?

Small symbols are placed in the lower 2G.

Andrew.
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