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[patch] elf32-arm.c: Fix shared library creation on arm-none-symbianelf.

Alan Modra amodra@bigpond.net.au
Tue Jul 26 13:17:00 GMT 2005 
On Mon, Jul 25, 2005 at 01:17:02PM -0700, Kazu Hirata wrote:
> Hi,
> 
> Attached is a patch to fix shared library creation on
> arm-none-symbianelf.
> 
> Consider a simple object file that comes from:
> 
>         .comm   g,4,4
> 
> When I try to create a shared library with this object file, I get:
> 
> ./ld-new: a.out: could not find output section .got for input section .got
> ./ld-new: final link failed: Nonrepresentable section on output
> 
> The problem is that the linker wants to output _GLOBAL_OFFSET_SYMBOL_
> to the .got section, but before that happens,
> elf32_arm_size_dynamic_sections prunes the .got section by adding
> SEC_EXCLUDE to the .got section's flags.
> 
> The patch fixes the problem by keeping the .got section even if it's
> empty.
> 
> Tested by building i686-pc-linux-gnu X arm-none-symbianelf.  I have a
> strong feeling that I am papering over a real bug elsewhere, but I
> don't know where to go from here.

You see this on symbianelf because the got header is defined to be
zero size.

/* There is no .got section for BPABI objects, and hence no header.  */
#undef elf_backend_got_header_size
#define elf_backend_got_header_size 0

However, that comment makes me think you shouldn't have a
_GLOBAL_OFFSET_TABLE_ symbol either.  If the comment is correct, then
perhaps you need

#define elf_backend_want_got_sym 0

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre
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