[PATCH 2/2] all: improve R_NEG support for AIX

[Nick Clifton]

Hi Clement,

> bfd/ChangeLog:
> C2021-04-19  Clément Chigot  <clement.chigot@atos.net>
> 
> 	PR binutils/21700
> 	* reloc.c (BFD_RELOC_PPC_NEG): New relocation.
> 	* bfd-in2.h: Regenerate.
> 	* libbfd.h: Regenerate.
> 	* coff-rs6000.c (_bfd_xcoff_reloc_type_lookup): Add
> 	BFD_RELOC_PPC_NEG handler.
> 	(xcoff_reloc_type_neg): Correctly substract addend.
> 	* coff64-rs6000.c (xcoff64_howto_table): Add R_NEG_32
> 	howto.
> 	(xcoff64_rtype2howto): Add handler for R_NEG_32.
> 	(xcoff64_reloc_type_lookup): Add BFD_RELOC_PPC_NEG handler.
> 
> gas/ChangeLog:
> 2021-04-19  Clément Chigot  <clement.chigot@atos.net>
> 
> 	PR binutils/21700
> 	* config/tc-ppc.c (ppc_get_csect_to_adjust): New function.
> 	(ppc_fix_adjustable): Manage fx_subsy part.
> 	(tc_gen_reloc): Create second relocation when both
> 	fx_addsy and fx_subsy are provided.
> 	* config/tc-ppc.h (RELOC_EXPANSION_POSSIBLE): New define.
> 	(MAX_RELOC_EXPANSION): Likewise.
> 	(TC_FORCE_RELOCATION_SUB_SAME): Likewise
> 	(UNDEFINED_DIFFERENCE_OK): Likewise
> 	* testsuite/gas/all/gas.exp: Skip difference between two
> 	undefined symbols test.
> 
> ld/ChangeLog:
> 2021-04-19  Clément Chigot  <clement.chigot@atos.net>
> 
> 	PR binutils/21700
> 	* testsuite/ld-powerpc/aix52.exp: Add new test.
> 	* testsuite/ld-powerpc/aix-neg-reloc-32.d: New test.
> 	* testsuite/ld-powerpc/aix-neg-reloc-64.d: New test.
> 	* testsuite/ld-powerpc/aix-neg-reloc.ex: New test.
> 	* testsuite/ld-powerpc/aix-neg-reloc.s: New test.
> 
Approved - please apply.

Cheers
   Nick