What types of relocations needed to be saved in the option "-emit-relocs" in ld linker?

[罗海玲]

Hi all,
    I’m new of ld linker. And I have a simple problem about ld linker. 
What types of relocations needed to be saved in the option "-emit-relocs” 
in ld linker? Do all types of relocations need to be saved?

Thanks.

Best regards,
Luo