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

[Jan Beulich]

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

If I had already put in my "bfd: avoid elf-attrs.c for ELF-attributes-free targets",
I would have feared it was me to have screwed up. But I deliberately kept that out
until your stuff would have gone in (and now also until we would have branched).

Jan