[PATCH 1/4] gas: add visibility support for XCOFF

[Nick Clifton]

Hi Clement,

> XCOFF assembly defines the visibility using an additional argument
> on several pseudo-ops: .globl, .weak, .extern and .comm.
> This implies that .globl and .weak syntax is different than the
> usual GNU syntax. But we want to provide compatibility with AIX
> assembler, especially because GCC is generating the visibility
> using this XCOFF syntax.
> 
> PR 22085
> 
> bfd/ChangeLog:
> 
>          * coffcode.h (coff_write_object_contents): Change XCOFF header
>          vstamp field to 2.
>          * coffgen.c (coff_print_symbol): Increase the size for n_type.
> 
> gas/ChangeLog:
> 
>          * config/tc-ppc.c (ppc_xcoff_get_visibility): New function.
>          (ppc_globl): New function.
>          (ppc_weak): New function.
>          (ppc_comm): Add visibility field support.
>          (ppc_extern): Likewise.
>          * testsuite/gas/all/cofftag.d: Adjust to new n_type size
>          providing by objdump.
>          * testsuite/gas/ppc/test1xcoff32.d: Likewise.
>          * testsuite/gas/ppc/aix.exp: Add new tests.
>          * testsuite/gas/ppc/xcoff-visibility-1-32.d: New test.
>          * testsuite/gas/ppc/xcoff-visibility-1-64.d: New test.
>          * testsuite/gas/ppc/xcoff-visibility-1.s: New test.
> 
> include/ChangeLog:
> 
>          * coff/internal.h (SYM_V_INTERNAL, SYM_V_HIDDEN,
>          SYM_V_PROTECTED, SYM_V_EXPORTED, SYM_V_MASK): New defines.
>          * coff/xcoff.h (struct xcoff_link_hash_entry): Add visibility
>          field.
> 
> ld/ChangeLog:
> 
>          * testsuite/ld-pe/pr19803.d: Adjust to new n_type size
>          providing by objdump.

Approved - please apply.

Cheers
   Nick