[PATCH v3 0/1] aarch64: Use build attributes for feature marking

[Muhammad Kamran]

This is v3 of the patch.

This version updates the AArch64 assembly feature marking logic to emit
AArch64 feature-and-bits build attributes when the toolchain supports build
attributes via __ARM_BUILDATTR64_FV.

For such toolchains, assembly objects now use .aeabi_attribute entries
for BTI, PAC, and GCS. For older toolchains, the existing
NT_GNU_PROPERTY_TYPE_0 note emission is kept as the fallback.

Compared with the previous version, I kept the existing GNU_PROPERTY
macro layout and indentation unchanged, so the diff is focused on the new
build-attribute support. The same selection logic is mirrored in
elf/tst-asm-helper.h, since some assembly tests and custom test DSOs
cannot include sysdep.h.

v2 can be found here:
https://inbox.sourceware.org/libc-alpha/20260518104714.19292-1-muhammad.kamran@arm.com/T/#t

v1 can be found here:
https://inbox.sourceware.org/libc-alpha/20260518094339.10846-1-muhammad.kamran@arm.com/T/#u

Changes since v2:
	* Address feedback from Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>.
	Reverted indentation change for macro GNU_PROPERTY.

Changes since v1:
	* Emit feature bti/gcs/pac 0 if the individual feature is disabled
	rather than not emitting it in build attributes.

Muhammad Kamran (1):
  aarch64: Use build attributes for asm feature marking

 elf/tst-asm-helper.h     | 37 ++++++++++++++++++++++++++++++-------
 sysdeps/aarch64/sysdep.h | 32 ++++++++++++++++++++++++++++----
 2 files changed, 58 insertions(+), 11 deletions(-)

-- 
2.43.0