Intrusive SHAMap smart pointers for efficient memory use and lock-free synchronization (#5152)

The main goal of this optimisation is memory reduction in SHAMapTreeNodes by introducing intrusive pointers instead of standard std::shared_ptr and std::weak_ptr.

Author: vlntb

CMakeLists.txt

@@ -21,6 +21,18 @@ endif()
 project (xrpl)
 set(Boost_NO_BOOST_CMAKE ON)
 
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+    # GCC-specific fixes
+    add_compile_options(-Wno-unknown-pragmas -Wno-subobject-linkage)
+    # -Wno-subobject-linkage can be removed when we upgrade GCC version to at least 13.3
+elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    # Clang-specific fixes
+    add_compile_options(-Wno-unknown-warning-option) # Ignore unknown warning options
+elseif(MSVC)
+    # MSVC-specific fixes
+    add_compile_options(/wd4068) # Ignore unknown pragmas
+endif()
+
 # make GIT_COMMIT_HASH define available to all sources
 find_package(Git)
 if(Git_FOUND)