anjiahao1 opened a new pull request, #19454:
URL: https://github.com/apache/nuttx/pull/19454
## Summary
* The `nucleo-f302r8:ihm07m1_b16` (FOC motor control) configuration no
longer links: the image overflows the STM32F302R8 64 KiB flash region
by ~470 bytes.
* Enable GNU Full LTO (`CONFIG_LTO_FULL=y`) for this configuration so
cross-module dead-code elimination brings the image back under the
flash limit.
## Impact
* Is new feature added? Is existing feature changed? NO.
* Impact on user? NO.
* Impact on build? YES — this config now builds with LTO; link time and
memory usage increase, but the image fits flash (88% used vs. previous
overflow).
* Impact on hardware? NO.
* Impact on documentation? NO.
* Impact on security? NO.
* Impact on compatibility? NO.
* Anything else? LTO_FULL is marked EXPERIMENTAL in Kconfig; chosen here
because the config is otherwise unbuildable within 64 KiB.
## Testing
I confirm that changes are verified on local setup and works as intended:
* Build Host(s): Ubuntu, arm-none-eabi-gcc 12.2.1
* Target(s): `nucleo-f302r8:ihm07m1_b16` (STM32F302R8, 64 KiB flash)
* Build: `./tools/configure.sh nucleo-f302r8:ihm07m1_b16 && make`
Testing logs before change (link fails — flash overflowed):
```
arm-none-eabi-ld: region `flash' overflowed by 472 bytes
Memory region Used Size Region Size %age Used
flash: 66008 B 64 KB 100.72%
```
Testing logs after change (links cleanly with LTO):
```
Memory region Used Size Region Size %age Used
flash: 57740 B 64 KB 88.10%
sram: 5688 B 16 KB 34.72%
```
## PR verification Self-Check
* [X] This PR introduces only one functional change.
* [X] I have updated all required description fields above.
* [X] My PR adheres to Contributing Guidelines and Documentation (git
commit title and message, coding standard, etc).
* [ ] My PR is still work in progress (not ready for review).
* [X] My PR is ready for review and can be safely merged into a codebase.
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