gold linker: rejected multiple definitions with the same absolute value

[Michael Orlitzky]

Hello,

When compiling a hardened kernel[0] with CONFIG_PAX_RAP=y and using
ld.gold as my linker, I get the following error (among others similar):

 ld: error: init/mounts.o: multiple definition of '__rap_hash_ret_panic'
 ld: init/main.o: previous definition here

As it says, the symbol is defined in both places...

 $ readelf --symbols init/main.o | grep __rap_hash_ret_panic
 415: ffffffff8eba9bf0     0 OBJECT  GLOBAL DEFAULT  ABS __rap_hash_r...

 $ readelf --symbols init/mounts.o | grep __rap_hash_ret_panic
 165: ffffffff8eba9bf0     0 OBJECT  GLOBAL DEFAULT  ABS __rap_hash_r...
But, as you can see, both symbols have equal absolute values. The BFD
linker lets that slide. Is the stricter approach the intended behavior
for ld.gold?


[0] https://github.com/minipli/linux-unofficial_grsec