[PATCH, ARM] Add support for value 3 of Tag_ABI_VFP_args attribute

[Thomas Preud'homme]

Hi,

This patch adds support for the value 3 of the Tag_ABI_VFP_args EABI attribute, in particular with linking. A file with value 3 for this attribute can be linked to other files with any value for this attribute, for instance with value 0 (softfloat, default) or value 1 (hardfloat). The patchs also extends readelf and gdb to handle this new value and add testcases in bfd.

ChangeLog are as follows:

*** bfd/ChangeLog ***

2014-07-23  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* elf32-arm.c (elf32_arm_merge_eabi_attributes): Handle new
	Tag_ABI_VFP_args value.
	(elf32_arm_post_process_headers): Set e_flags in ELF header as soft
	float instead of hard float when Tag_ABI_VFP_args is 2 or 3.

*** binutils/ChangeLog ***

2014-07-23  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* readelf.c (arm_attr_tag_ABI_VFP_args): Add "compatible".

*** gdb/ChangeLog ***

2014-07-23  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* arm-tdep.c (arm_gdbarch_init): Explicitely handle value 3 of
	Tag_ABI_VFP_args.

*** gold/ChangeLog ***

2014-07-23  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* arm.cc (Target_arm::do_adjust_elf_header): Set e_flags in ELF header
	as soft float instead of hard float when Tag_ABI_VFP_args is 2 or 3.
	(Target_arm::merge_object_attributes): Handle new Tag_ABI_VFP_args
	value.

*** ld/testsuite/ChangeLog ***

2014-07-23  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* ld-arm/attr-merge-2a.s: Add Tag_ABI_VFP_args.
	* ld-arm/attr-merge-2b.s: Likewise.
	* ld-arm/attr-merge-2.attr: Likewise.
	* ld-arm/attr-merge-4a.s: Add Tag_ABI_FP_number_model and
	Tag_ABI_VFP_args.
	* ld-arm/attr-merge-4b.s: Likewise.
	* ld-arm/attr-merge-4.attr: Likewise.
	* ld-arm/attr-merge-6a.s: Likewise.
	* ld-arm/attr-merge-6b.s: Likewise.
	* ld-arm/attr-merge-6.attr: Add Tag_ABI_FP_number_model.


See patch in attachment.

This was tested with with the binutils regression testsuite and no new regressions were found. Is it OK for trunk?

Best regards,

Thomas Preud'homme
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