Make sure that unused symbols are dropped when using GCC22.08-rc2

Add compiler and linker options to add each symbols in its own section
so unused one can be dropped.

Also adds missing noexcept

Change-Id: I9143ae5865c4a071c6e09d14eb08ce3069b4b2db

2 files changed, 9 insertions, 5 deletions

diff --git a/applications/message_handler/lib/freertos_allocator.cpp b/applications/message_handler/lib/freertos_allocator.cpp
index c7fdba6..883ada8 100644
--- a/applications/message_handler/lib/freertos_allocator.cpp
+++ b/applications/message_handler/lib/freertos_allocator.cpp
@@ -28,18 +28,18 @@ void *operator new[](size_t size) {
     return pvPortMalloc(size);
 }
 
-void operator delete(void *ptr) {
+void operator delete(void *ptr) noexcept {
     vPortFree(ptr);
 }
 
-void operator delete(void *ptr, std::size_t) {
+void operator delete(void *ptr, std::size_t) noexcept {
     vPortFree(ptr);
 }
 
-void operator delete[](void *ptr) {
+void operator delete[](void *ptr) noexcept {
     vPortFree(ptr);
 }
 
-void operator delete[](void *ptr, std::size_t) {
+void operator delete[](void *ptr, std::size_t) noexcept {
     vPortFree(ptr);
 }
diff --git a/cmake/toolchain/arm-none-eabi-gcc.cmake b/cmake/toolchain/arm-none-eabi-gcc.cmake
index ce54cd5..492abc5 100644
--- a/cmake/toolchain/arm-none-eabi-gcc.cmake
+++ b/cmake/toolchain/arm-none-eabi-gcc.cmake
@@ -52,7 +52,9 @@ add_compile_options(
     -mcpu=${GCC_CPU}
     -mthumb
     "$<$<CONFIG:DEBUG>:-gdwarf-3>"
-    "$<$<COMPILE_LANGUAGE:CXX>:-fno-unwind-tables;-fno-rtti;-fno-exceptions>")
+    "$<$<COMPILE_LANGUAGE:CXX>:-fno-unwind-tables;-fno-rtti;-fno-exceptions>"
+    -fdata-sections
+    -ffunction-sections)
 
 # Compile defines
 add_compile_definitions(
@@ -88,6 +90,8 @@ if (FLOAT)
     add_link_options(-mfloat-abi=${FLOAT})
 endif()
 
+add_link_options(LINKER:--nmagic,--gc-sections)
+
 # Compilation warnings
 add_compile_options(
     -Wall