Ignore Wdangling-reference warnings on GCC 13

.clang-uml

@@ -3,6 +3,7 @@ output_directory: docs/diagrams
 comment_parser: clang
 remove_compile_flags:
   - -Wno-class-memaccess
+  - -Wno-dangling-reference
 generate_links:
   link: "{% if existsIn(element, \"doxygen_link\") %}{{ element.doxygen_link }}{% endif %}"
   tooltip: "{% if existsIn(element, \"comment\") and existsIn(element.comment, \"brief\") %}{{ abbrv(trim(replace(element.comment.brief.0, \"\\n+\", \" \")), 256) }}{% else %}{{ element.name }}{% endif %}"

CMakeLists.txt

@@ -136,14 +136,21 @@ endif()
 # Setup custom compile options depending on various compiler
 # and environment quirks
 #
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "13.0")
+        # Workaround over Wdangling-reference false positives in libfmt
+        set(CUSTOM_COMPILE_OPTIONS ${CUSTOM_COMPILE_OPTIONS} -Wno-dangling-reference)
+    endif()
+endif()
+
 if(LLVM_VERSION_MAJOR GREATER_EQUAL 17)
     if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-        set(CUSTOM_COMPILE_OPTIONS "-Wno-class-memaccess")
+        set(CUSTOM_COMPILE_OPTIONS ${CUSTOM_COMPILE_OPTIONS} -Wno-class-memaccess)
     endif()
 endif()
 if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     set(CUSTOM_COMPILE_OPTIONS
-            "${CUSTOM_COMPILE_OPTIONS} -Wno-unused-private-field")
+            ${CUSTOM_COMPILE_OPTIONS} -Wno-unused-private-field)
 endif()
 
 #