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The reason for having this logic in the assembler is for the case where you have function calls / branches to transform from one state to the other and push the rest out to the linker to handle by veneering. For arch versions that didn't have the equivalent {x} variant we would want to push out the relocations.
Actually, it seems that I misunderstood the purpose of arm_force_relocation. It just triggers a flag for gas internal use, which is set appropriately in md_apply_fix.Finally, I am not sure about the new behaviour of arm_force_relocation(): it now returns 1 in several new occurrences, but the corresponding relocations do not appear in the object file (see blx-local test)
I'll have to take another look at this and get back to you.
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