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samples: matter: enable LTO by default for release and nRF70
Enable LTO by default for release configuration in all samples and applications and for nRF70. Signed-off-by: Maciej Baczmanski <[email protected]> Co-authored-by: Kamil Kasperczyk <[email protected]>
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‎applications/matter_bridge/prj_release.conf‎

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@@ -56,5 +56,9 @@ CONFIG_CHIP_ENABLE_READ_CLIENT=y
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# Enable Watchdog
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CONFIG_NCS_SAMPLE_MATTER_WATCHDOG=y
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# Enable LTO to decrease the flash usage.
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CONFIG_LTO=y
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CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
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# Increase heap size to accommodate the memory required for additional bridged devices.
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CONFIG_CHIP_MALLOC_SYS_HEAP_SIZE=16384

‎applications/matter_bridge/sample.yaml‎

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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto:
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applications.matter_bridge:
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sysbuild: true
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build_only: true
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extra_args:
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto.br_ble:
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applications.matter_bridge.br_ble:
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sysbuild: true
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build_only: true
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extra_args:
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto.br_ble.smp_dfu:
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applications.matter_bridge.br_ble.smp_dfu:
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sysbuild: true
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build_only: true
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extra_args:
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto.nrf5340.wifi:
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applications.matter_bridge.nrf5340.wifi:
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sysbuild: true
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build_only: true
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extra_args:
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto.br_ble.nrf54h20.wifi:
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applications.matter_bridge.br_ble.nrf54h20.wifi:
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sysbuild: true
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build_only: true
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extra_args:
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto.br_ble.memory_profiling:
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applications.matter_bridge.br_ble.memory_profiling:
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sysbuild: true
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build_only: true
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extra_args:
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- CONFIG_BRIDGE_MIGRATE_VERSION_1=n
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- CONFIG_WIFI_NM_WPA_SUPPLICANT_WPA3=n
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integration_platforms:
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- nrf7002dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpuapp
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- nrf54h20dk/nrf54h20/cpuapp
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platform_allow:
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- nrf7002dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpuapp
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- nrf54h20dk/nrf54h20/cpuapp
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_bridge.lto.smart_plug:
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applications.matter_bridge.smart_plug:
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sysbuild: true
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build_only: true
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extra_args:

‎applications/matter_weather_station/prj_release.conf‎

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@@ -69,6 +69,10 @@ CONFIG_BOARD_SERIAL_BACKEND_CDC_ACM=n
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# Enable Watchdog
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CONFIG_NCS_SAMPLE_MATTER_WATCHDOG=y
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# Enable LTO
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CONFIG_LTO=y
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CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
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# Enable Diagnostic Logs feature
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CONFIG_NCS_SAMPLE_MATTER_DIAGNOSTIC_LOGS=y
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CONFIG_NCS_SAMPLE_MATTER_DIAGNOSTIC_LOGS_CRASH_LOGS=y

‎applications/matter_weather_station/sample.yaml‎

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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_weather_station.lto:
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sysbuild: true
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build_only: true
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extra_args:
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- OVERLAY_CONFIG=overlay-factory_data.conf
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- FILE_SUFFIX=factory_data
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- CONFIG_CHIP_FACTORY_DATA=y
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- SB_CONFIG_MATTER_FACTORY_DATA_GENERATE=y
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- CONFIG_LTO=y
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- CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
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platform_allow: thingy53/nrf5340/cpuapp
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platform_exclude: thingy53/nrf5340/cpuapp/ns
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integration_platforms:
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- thingy53/nrf5340/cpuapp
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tags:
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- sysbuild
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- ci_applications_matter
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applications.matter_weather_station.nrf7002eb:
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sysbuild: true
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build_only: true

‎doc/nrf/protocols/matter/getting_started/memory_optimization.rst‎

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LTO is an advanced compilation technique that performs optimization across all compiled units of an application at the link stage, rather than within each unit separately.
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LTO is enabled by default for:
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- The :ref:`matter_bridge_app` application.
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- The ``release`` configuration of the :ref:`matter_samples` and the :ref:`matter_weather_station_app`.
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- The ``nrf7002dk/nrf5340/cpuapp`` build target in the :ref:`matter_samples`.
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To enable LTO, set the :kconfig:option:`CONFIG_LTO` and :kconfig:option:`CONFIG_ISR_TABLES_LOCAL_DECLARATION` Kconfig options to ``y``.
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.. _ug_matter_device_memory_profiling:

‎doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst‎

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* Enabled SUIT DFU support for the :ref:`matter_bridge_app` application.
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Currently, only the Matter OTA protocol is fully supported for SUIT DFU purposes.
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* Enabled Link Time Optimization (LTO) by default for the ``release`` configuration.
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nRF5340 Audio
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-------------
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Thingy:53: Matter weather station
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---------------------------------
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|no_changes_yet_note|
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* Enabled Link Time Optimization (LTO) by default for the ``release`` configuration.
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Samples
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=======
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* Updated the :ref:`matter_template_sample` sample document with the instructions on how to build the sample on the nRF54L15 DK with support for Matter OTA DFU and DFU over Bluetooth SMP, and using internal MRAM only.
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* Enabled SUIT DFU support for the :ref:`matter_lock_sample`, and :ref:`matter_template_sample` samples.
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Currently, only the Matter OTA protocol is fully supported for SUIT DFU purposes.
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* Enabled Link Time Optimization (LTO) by default for the ``release`` configuration and ``nrf7002dk/nrf5340/cpuapp`` build target.
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Networking samples
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------------------

‎samples/matter/light_bulb/boards/nrf7002dk_nrf5340_cpuapp.conf‎

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#
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# Copyright (c) 2025 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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#
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# Enable LTO to decrease the flash usage.
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CONFIG_LTO=y
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CONFIG_ISR_TABLES_LOCAL_DECLARATION=y

‎samples/matter/light_bulb/prj_release.conf‎

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# Enable Watchdog
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CONFIG_NCS_SAMPLE_MATTER_WATCHDOG=y
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# Enable LTO to decrease the flash usage.
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CONFIG_LTO=y
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CONFIG_ISR_TABLES_LOCAL_DECLARATION=y

‎samples/matter/light_bulb/sample.yaml‎

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tags:
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- sysbuild
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- ci_samples_matter
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sample.matter.light_bulb.lto:
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sysbuild: true
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build_only: true
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extra_args:
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- CONFIG_LTO=y
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- CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
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integration_platforms:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf7002dk/nrf5340/cpuapp
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- nrf54l15dk/nrf54l15/cpuapp
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platform_allow:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf7002dk/nrf5340/cpuapp
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- nrf54l15dk/nrf54l15/cpuapp
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tags:
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- sysbuild
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- ci_samples_matter
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sample.matter.light_bulb.ffs:
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sysbuild: true
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build_only: true
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf54l15dk/nrf54l15/cpuapp
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- nrf7002dk/nrf5340/cpuapp
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integration_platforms:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf54l15dk/nrf54l15/cpuapp
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tags:
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- sysbuild
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- ci_samples_matter
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sample.matter.light_bulb.lto.memory_profiling.persistent_subscriptions:
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sysbuild: true
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build_only: true
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extra_args:
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- CONFIG_CHIP_PERSISTENT_SUBSCRIPTIONS=y
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- CONFIG_CHIP_MEMORY_PROFILING=y
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- CONFIG_SHELL_MINIMAL=y
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- CONFIG_LTO=y
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- CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
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platform_allow: nrf7002dk/nrf5340/cpuapp
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integration_platforms:
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- nrf7002dk/nrf5340/cpuapp
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tags:
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- sysbuild

‎samples/matter/light_switch/boards/nrf7002dk_nrf5340_cpuapp.conf‎

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#
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# Copyright (c) 2025 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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#
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# Enable LTO to decrease the flash usage.
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CONFIG_LTO=y
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CONFIG_ISR_TABLES_LOCAL_DECLARATION=y

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