From 244a9b8514d066a457574b73ef82cc5925148fc2 Mon Sep 17 00:00:00 2001
From: Davide Grohmann <davide.grohmann@arm.com>
Date: Mon, 15 Aug 2022 17:11:54 +0200
Subject: Make sure that unused symbols are dropped when using GCC

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
---
 applications/message_handler/lib/freertos_allocator.cpp | 8 ++++----
 cmake/toolchain/arm-none-eabi-gcc.cmake                 | 6 +++++-
 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
-- 
cgit v1.2.1