TLS question

[Ian Lance Taylor]

Alireza Moshtaghi <alireza.moshtaghi@ericsson.com> writes:

> An extern variable is defined as an UND symbol in the elf file, however,
> when it is classified with __thread, the linker needs to match it up
> with the correct definition from another object file.
> The way that I have implemented TLS support in my port of binutils, the
> linker complains that the extern symbol is not TLS and it can not link
> it to the definition from the other object file. 
>
> The only thing that I can think of is to teach ld to look at the
> relocation for that symbol and if it is a TLS relocation, it should be
> able to match the two, but I don't know how to teach ld to do so.
>
> Question is: where in the linker I must modify?

An extern __thread variable should be SHN_UNDEF, STB_GLOBAL, STT_TLS.
In other words, you don't have to look at relocations, you just have to
look at the symbol type.

Ian