MaskRay added a comment.
In D92633#2433108 <https://reviews.llvm.org/D92633#2433108>, @tmsriram wrote:
> You said : "The name -mpie-copy-relocations is misleading [1] and does not
> capture the idea that this option can actually apply to all of
> -fno-pic,-fpie, ..."
>
> Could you please clarify why this option needs to apply to -fno-pic? Here is
> what I tried with trunk clang:
If the user wants to guarantee no copy relocations in -fno-pic code, they can
theoretically apply -fno-direct-access-external-data to use a GOT indirection.
This is not implemented, though.
> extern int var;
> int get() { return var; }
>
> $ clang -S foo.c -o -
> ....
> movl var, %eax
> popq %rbp
> ...
>
> With -fno-pic, this will never need to use -mpie-copy-relocations at all, so
> this case is not relevant right? Did I miss anything?
-fno-pic code can only be used with -no-pie links (position-dependent
executables) If var is not defined in the linked executable, it will have a
copy relocation.
Repository:
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https://reviews.llvm.org/D92633/new/
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