[cfe-dev] Why -fno-pic and -fPIC gives the same results?

[Peter Smith via cfe-dev]

Hello,

On many targets the instructions needed for an empty function won't
need to refer to an address at all, so will always be position
independent, hence no difference in code-generation. If you make the
example a bit more complex, such as using a global variable then
you'll see some code-generation differences between -fPIC and
-fno-pic.

Hope this helps.

Peter

On Thu, 24 Jan 2019 at 15:28, Peng Yu via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
>
> Hi,
>
> I got this. Why -fno-pic and -fPIC are the same?
>
> $ cat f.c
> void f() { }
> $ clang -fno-pic f.c -c -o nopic.o
> $ clang -fPIC f.c -c -o pic.o
> $ cmp nopic.o pic.o
> $ echo "$?"
> 0
>
> --
> Regards,
> Peng
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