[PATCH v12 00/25] AArch64 AEABI build attributes (a.k.a. object attributes v2)

[Jan Beulich]

On 22.01.2026 16:19, Jan Beulich wrote:
> On 16.01.2026 19:59, Matthieu Longo wrote:
>> Matthieu Longo (20):
>>   bfd: move elf_new_obj_attr to the BFD public API
>>   gas: use common code for object attribute v1 & v2 parsing
>>   bfd: parse Object Attributes v2's section in input object files
>>   bfd: add support for copying Object Attributes v2
>>   objcopy tests for Object Attributes v2
>>   OAv2 merge: plumbing of generic merge logic during linkage
>>   OAv2 merge: find first input containing an object attributes section
>>   OAv2 merge: create a section for object attributes
>>   OAv2 merge: merge subsections and tags at file scope
>>   OAv2 merge: mark unknown subsections
>>   OAv2 merge: merging Object Attributes
>>   OAv2 merge: prune unsupported or invalid subsections and attributes
>>   OAv2 merge: translate GNU properties to Object Attributes v2 (and vice versa)
>>   ld tests for generic merge coverage of Object Attributes v2
>>   aarch64: merge of Object Attributes v2 during linkage
>>   ld tests for AArch64-specific merge coverage for AEABI Build Attributes
>>   gnu directives: add support for .gnu_attribute and .gnu_subsection in OAv2 context
>>   gnu directives: gas/readelf tests for gnu attributes v2
>>   gnu directives: bfd: generic tests for objcopy of gnu attributes v2
>>   gnu directives: bfd: generic tests for merge of gnu attributes v2
>>
>> Richard Ball (5):
>>   Object Attributes v2: new abstractions for subsections and attributes
>>   gas: implement parsing of object attributes v2
>>   bfd: write Object Attributes v2
>>   readelf: dump Object Attributes v2
>>   Serialization and dumping tests of Object Attributes v2
> 
> Looks like there's yet more fallout, this time on an Arm64 build host (afaict):
> 
> /usr/bin/ld: config/obj-elf-attr.o: in function `obj_attr_v2_record':
> /home/builder/worker/binutils-fedora-arm64/binutils-build/gas/../../binutils-gdb/gas/config/obj-elf-attr.c:1058:(.text+0x1020): undefined reference to `bfd_elf_obj_attr_v2_init'
> /usr/bin/ld: /home/builder/worker/binutils-fedora-arm64/binutils-build/gas/../../binutils-gdb/gas/config/obj-elf-attr.c:1064:(.text+0x1040): undefined reference to `_bfd_obj_attr_v2_find_by_tag'
> /usr/bin/ld: /home/builder/worker/binutils-fedora-arm64/binutils-build/gas/../../binutils-gdb/gas/config/obj-elf-attr.c:1084:(.text+0x1104): undefined reference to `obj_attr_v2_t_append'
> /usr/bin/ld: config/obj-elf-attr.o: in function `obj_attr_v2_subsection_record':
> /home/builder/worker/binutils-fedora-arm64/binutils-build/gas/../../binutils-gdb/gas/config/obj-elf-attr.c:1158:(.text+0x137c): undefined reference to `obj_attr_subsection_v2_t_append'
> /usr/bin/ld: /home/builder/worker/binutils-fedora-arm64/binutils-build/gas/../../binutils-gdb/gas/config/obj-elf-attr.c:1133:(.text+0x13e8): undefined reference to `obj_attr_subsection_v2_t_remove'
> /usr/bin/ld: /home/builder/worker/binutils-fedora-arm64/binutils-build/gas/../../binutils-gdb/gas/config/obj-elf-attr.c:1135:(.text+0x13fc): undefined reference to `obj_attr_subsection_v2_t_append'
> collect2: error: ld returned 1 exit status
> make[3]: *** [Makefile:1305: as-new] Error 1

Actually, looking a little more closely, from their names these all look like
functions that weren't intended for use outside of libbfd. So likely we're
seeing the results of an --enable-shared build above.

Jan