Re: ld reloc error

[Alan Modra]

On Tue, Apr 20, 2004 at 10:46:04AM -0400, address@hidden wrote:
> I define a global symbol, onetwothree=0x123 in defit.s.  I reference it in
> another file, refit.s.
> 
> If I link everything as one big executable, it comes out as 0x123 in the
> both the definition and reference files, which is what I want.
> 
> If I put both the definition and reference in a shareable (.so) file, the
> reference gets relocated by the base of the shareable, which isn't right. 
> The definition remains as 0x123, it does not get relocated.

Yes, this is a known problem that likely will not be fixed soon.  To
fix it, you'd need to modify glibc's ld.so to not relocate absolute syms
at run time.  That can't be done at the moment because ld emits some
absolute symbols that _do_ need to be relocated, eg. your .so has

    12: 00001444     0 OBJECT  GLOBAL DEFAULT  ABS _DYNAMIC
    16: 000014e8     0 NOTYPE  GLOBAL DEFAULT  ABS __bss_start
    18: 00000123     0 OBJECT  GLOBAL DEFAULT  ABS onetwothree
    19: 000014e8     0 NOTYPE  GLOBAL DEFAULT  ABS _edata
    20: 000014dc     0 OBJECT  GLOBAL DEFAULT  ABS _GLOBAL_OFFSET_TABLE_
    21: 000014e8     0 NOTYPE  GLOBAL DEFAULT  ABS _end

All of these need relocating relative to the start of the library,
except your onetwothree symbol.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre