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x86: Remove empty X86_FEATURE_1_AND property

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There is no need to generate .note.gnu.property section with empty
X86_FEATURE_1_AND property.  This patch adds fixup_gnu_properties
to ELF linker backend so that x86 backend can remove it.

bfd/

	PR ld/23515
	* elf-bfd.h (elf_backend_data): Add fixup_gnu_properties.
	* elf-properties.c (_bfd_elf_link_setup_gnu_properties): Call
	backend fixup_gnu_properties if it isn't NULL.  Discard
	.note.gnu.property section if all properties have been removed.
	* elfxx-target.h (elf_backend_fixup_gnu_properties): New.
	(elfNN_bed): Initialize fixup_gnu_properties.
	* elfxx-x86.c (_bfd_x86_elf_link_fixup_gnu_properties): New
	function.
	* elfxx-x86.h (_bfd_x86_elf_link_fixup_gnu_properties): New
	prototype.
	(elf_backend_fixup_gnu_properties): New.

ld/

	PR ld/23515
	* testsuite/ld-i386/ibt-plt-2a.d: Updated.
	* testsuite/ld-i386/ibt-plt-2b.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2a-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2a.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2b-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2b.d: Likewise.
This commit is contained in:
H.J. Lu
2018-08-17 03:54:05 -07:00
parent 2ecae92e23
commit bfb1e8c15a
13 changed files with 137 additions and 77 deletions
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4
bfd/elf-bfd.h
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@ -1479,6 +1479,10 @@ struct elf_backend_data
/* Set up GNU properties. */
bfd *(*setup_gnu_properties) (struct bfd_link_info *);
/* Fix up GNU properties. */
void (*fixup_gnu_properties) (struct bfd_link_info *,
elf_property_list **);
/* Encoding used for compact EH tables. */
int (*compact_eh_encoding) (struct bfd_link_info *);