[RFC][PATCH] Handle arbitrary .plt/.got displacements in ld on ARM

[Yury Gribov]

Will wrote:
> I think elf32_arm_use_long_plt_entry should probably be
> a boolean rather than size_t.

Done, thanks

> The comments on the PLT entries could be more verbose (i.e. point out
> that one PLT can address 28 bits and the other 32).

Ok, I tried my best.

> I wonder whether the FOUR_WORD_PLT #define is now rather ambiguous,
> maybe it should be removed?

That was my impression as well. At least there are no options in 
configure scripts to define.

> The gold parts of this patch look like they are not related?

Sorry, unrelated indeed.

> And obviously there would need to be ld testcases.

Added ld/testsuite/ld-arm/long-plt-format.{s,d}. BTW are there any 
guidelines for writing tests? I was unable to find any...

-Y
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