samples: net: mqtt: Enable LTO to increase available flash

krish2718 · rlubos · commit 59e24018dda0 · 2025-06-10T10:35:45.000+02:00
Customers when using TLS + Wi-Fi are running out of flash esp. for
TF-M/NS builds, enable LTO by default to conserver flash.

This saves ~52K of flash for NS and ~58K for non-NS.

Signed-off-by: Chaitanya Tata &lt;Chaitanya.Tata@nordicsemi.no&gt;
diff --git a/samples/net/mqtt/boards/nrf7002dk_nrf5340_cpuapp.conf b/samples/net/mqtt/boards/nrf7002dk_nrf5340_cpuapp.conf
@@ -59,3 +59,7 @@ CONFIG_NET_SOCKETS_DNS_TIMEOUT=30000
 
 # For Wi-Fi cred
 CONFIG_SETTINGS=y
+
+# Link-time optimizations
+CONFIG_LTO=y
+CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
diff --git a/samples/net/mqtt/boards/nrf7002dk_nrf5340_cpuapp_ns.conf b/samples/net/mqtt/boards/nrf7002dk_nrf5340_cpuapp_ns.conf
@@ -61,3 +61,7 @@ CONFIG_NET_SOCKETS_DNS_TIMEOUT=30000
 CONFIG_TFM_PROFILE_TYPE_SMALL=y
 CONFIG_PM_PARTITION_SIZE_TFM_SRAM=0xc000
 CONFIG_PM_PARTITION_SIZE_TFM=0x20000
+
+# Link-time optimizations
+CONFIG_LTO=y
+CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
