fix(cxx): use __cxa_throw() stub in case exceptions disabled

Reduces binary size since the linker will drop some code due to --gc-sections.

Author: Lapshin

components/cxx/CMakeLists.txt

@@ -39,7 +39,9 @@ if(NOT CONFIG_CXX_EXCEPTIONS)
         _Unwind_Resume_or_Rethrow
         _Unwind_Backtrace
         __cxa_call_unexpected
-        __gxx_personality_v0)
+        __gxx_personality_v0
+        __cxa_throw
+        __cxa_allocate_exception)
 
     foreach(wrap ${WRAP_FUNCTIONS})
         target_link_libraries(${COMPONENT_LIB} INTERFACE "-Wl,--wrap=${wrap}")

components/cxx/cxx_exception_stubs.cpp

@@ -178,4 +178,16 @@ extern "C" _Unwind_Reason_Code __wrap___gxx_personality_v0(int version,
     return abort_return<_Unwind_Reason_Code>();
 }
 
+// Reduces binary size since the linker will drop some code due to --gc-sections.
+extern "C" void __wrap___cxa_allocate_exception(void)
+{
+    abort();
+}
+
+// Reduces binary size since the linker will drop some code due to --gc-sections.
+extern "C" void __wrap___cxa_throw(void)
+{
+    abort();
+}
+
 #endif // CONFIG_COMPILER_CXX_EXCEPTIONS