general: fixes for gcc 13

src/CMakeLists.txt

@@ -126,6 +126,17 @@ else()
         add_compile_options("-stdlib=libc++")
     endif()
 
+    # GCC bugs
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12" AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        # These diagnostics would be great if they worked, but are just completely broken
+        # and produce bogus errors on external libraries like fmt.
+        add_compile_options(
+            -Wno-array-bounds
+            -Wno-stringop-overread
+            -Wno-stringop-overflow
+        )
+    endif()
+
     # Set file offset size to 64 bits.
     #
     # On modern Unixes, this is typically already the case. The lone exception is