Bug 15968

Summary:	rust-target-config.bbclass: +v5 is not a valid target feature flag
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	Zixun Li <zli>
Component:	devtools / tool chain	Assignee:	Ross Burton <ross.burton>
Status:	NEW ---	QA Contact:
Severity:	normal
Priority:	Medium	CC:	meta.mr.watcher, meta.watcher, randy.macleod, richard.purdie, sundeep.kokkonda
Version:	5.2
Target Milestone:	6.2
Hardware:	x86
OS:	x86_64
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	No (bug/feature does not impact docs)

Description Zixun Li 2025-09-09 12:01:34 UTC

Following warning is observed while compiling rust program for Microchip SAM9X60 processor (ARM926EJ-S architecture):

'+v5' is not a recognized feature for this target (ignoring feature)

This flag is added by llvm_features_from_tune() from rust-target-config.bbclass.

rustc --print target-features --target arm-poky-linux-gnueabi only have following options for armv5:

v5te                       - Support ARM v5TE, v5TEj, and v5TExp instructions.
armv5t                     - ARMv5t architecture.
armv5te                    - ARMv5te architecture.
armv5tej                   - ARMv5tej architecture.
v5t                        - Support ARM v5T instructions.

It's also not inside llvm's target features llvm/lib/Target/ARM
/ARMFeatures.td

Comment 1 Randy MacLeod 2025-09-11 14:49:02 UTC

Ross to try to work on identifying the arm version desired.

Comment 2 Richard Purdie 2025-09-11 14:49:47 UTC

Probably should map to vt5 and error if thumb not available

Comment 3 Ross Burton 2025-09-11 14:50:11 UTC

What version of yocto was used here? There have been changes to the rust configuration recently.

Comment 4 Zixun Li 2025-09-11 15:13:56 UTC

(In reply to Ross Burton from comment #3)
> What version of yocto was used here? There have been changes to the rust
> configuration recently.

I'm using v5.2. '+v5' exist from the very beginning since 61e1570.