Wrong object file generated with -fPIC option 2.17 ported to Interix

Wrong object file generated with -fPIC option 2.17 ported to Interix

[Mayank Kumar]

Hi All
While porting binutils 2.17 to interix, I am getting the following issue:-
An object file generated using -fPIC option has undefined symbols like the following:-
  U L10@GOTOFF
  U L12@GOTOFF
  U L5@GOTOFF
  U L6@GOTOFF
  U _gl1@GOT
  U _src@GOT


I also found that this is happening in the assembly phase. I did the following:-
Gcc  -S -fPIC file.c

As -o file.o file.s

The object file generated have all the above as undefined symbol. I want to know what part of assembler or bfd code resolves these labels so that I can debug more to find out why these undefined symbols are getting generated.

Thanks
Mayank

Re: Wrong object file generated with -fPIC option 2.17 ported to Interix

[Nick Clifton]

Hi Mayank,

> An object file generated using -fPIC option has undefined symbols like the following:-
>   U L10@GOTOFF
>   U L12@GOTOFF

> I also found that this is happening in the assembly phase. I did the following:-
>  gcc  -S -fPIC file.c
>  as -o file.o file.s
> 
> The object file generated have all the above as undefined symbol.

Just to be clear - it is gcc that is generating the references to these 
symbols, not the assembler.  If you look at "file.s" you should see them there.

 > I want to know what part of assembler or bfd code resolves these
> labels so that I can debug more to find out why these undefined
 > symbols are getting generated.

The "@GOTOFF" part of the symbol is a directive to the assembler telling it how 
the relocation for the symbol's value should be generated.  See the function 
lex_get() in gas/config/tc-i386.c

Cheers
   Nick