diff --git a/cmake/QtExecutableHelpers.cmake b/cmake/QtExecutableHelpers.cmake
index dc73f578446..37670c14570 100644
--- a/cmake/QtExecutableHelpers.cmake
+++ b/cmake/QtExecutableHelpers.cmake
@@ -370,6 +370,7 @@ function(qt_internal_add_configure_time_executable target)
     set(target_binary_dir "${CMAKE_CURRENT_BINARY_DIR}/configure_time_bins")
     if(arg_CONFIG)
         set(CMAKE_TRY_COMPILE_CONFIGURATION "${arg_CONFIG}")
+        string(TOUPPER "_${arg_CONFIG}" config_suffix)
     endif()
 
     get_cmake_property(is_multi_config GENERATOR_IS_MULTI_CONFIG)
@@ -463,6 +464,29 @@ function(qt_internal_add_configure_time_executable target)
             set(cmake_flags_arg CMAKE_FLAGS "${arg_CMAKE_FLAGS}")
         endif()
         configure_file("${template}" "${target_binary_dir}/CMakeLists.txt" @ONLY)
+
+        qt_internal_get_enabled_languages_for_flag_manipulation(enabled_languages)
+        foreach(lang IN LISTS enabled_languages)
+            set(compiler_flags_var "CMAKE_${lang}_FLAGS")
+            list(APPEND cmake_flags_arg "-D${compiler_flags_var}:STRING=${${compiler_flags_var}}")
+            if(arg_CONFIG)
+                set(compiler_flags_var_config "${compiler_flags_var}${config_suffix}")
+                list(APPEND cmake_flags_arg
+                    "-D${compiler_flags_var_config}:STRING=${${compiler_flags_var_config}}")
+            endif()
+        endforeach()
+
+        qt_internal_get_target_link_types_for_flag_manipulation(target_link_types)
+        foreach(linker_type IN LISTS target_link_types)
+            set(linker_flags_var "CMAKE_${linker_type}_LINKER_FLAGS")
+            list(APPEND cmake_flags_arg "-D${linker_flags_var}:STRING=${${linker_flags_var}}")
+            if(arg_CONFIG)
+                set(linker_flags_var_config "${linker_flags_var}${config_suffix}")
+                list(APPEND cmake_flags_arg
+                    "-D${linker_flags_var_config}:STRING=${${linker_flags_var_config}}")
+            endif()
+        endforeach()
+
         try_compile(result
             "${target_binary_dir}"
             "${target_binary_dir}"
diff --git a/src/tools/syncqt/CMakeLists.txt b/src/tools/syncqt/CMakeLists.txt
index 4d2cb640f07..b23d5836ef3 100644
--- a/src/tools/syncqt/CMakeLists.txt
+++ b/src/tools/syncqt/CMakeLists.txt
@@ -1,6 +1,17 @@
-# The tool should be optimized for maximum performance when working.
-if(NOT QT_USE_DEFAULT_CMAKE_OPTIMIZATION_FLAGS)
+if(NOT QT_INTERNAL_AVOID_OVERRIDING_SYNCQT_CONFIG)
+    qt_internal_get_configs_for_flag_manipulation(configs)
+    qt_internal_remove_known_optimization_flags(LANGUAGES CXX CONFIGS ${configs})
+    # The /RTC1 flag is present in the default DEBUG flags list and contradicts -O2 but is not
+    # removed by qt_internal_remove_known_optimization_flags
+    qt_internal_remove_compiler_flags("/RTC1" LANGUAGES CXX CONFIGS ${configs})
     qt_internal_get_optimize_full_flags(optimize_full_flags)
+    qt_internal_add_compiler_flags(LANGUAGES CXX CONFIGS ${configs} FLAGS "${optimize_full_flags}")
+
+    # Replace all linker flags with those we use in the RelWithDebInfo configuration
+    list(REMOVE_ITEM configs RELWITHDEBINFO)
+    foreach(config IN LISTS configs)
+        set(CMAKE_EXE_LINKER_FLAGS_${config} "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
+    endforeach()
 endif()
 
 set(compile_definitions
@@ -15,7 +26,6 @@ qt_get_tool_target_name(target_name syncqt)
 if(NOT QT_SYNC_HEADERS_AT_CONFIGURE_TIME)
     qt_internal_add_tool(${target_name}
         DEFINES ${compile_definitions}
-        COMPILE_OPTIONS ${optimize_full_flags}
         TOOLS_TARGET Core
         CORE_LIBRARY None
         INSTALL_DIR "${INSTALL_LIBEXECDIR}"
@@ -39,7 +49,6 @@ else()
     # To re-build syncqt use 'syncqt_build' target.
     qt_internal_add_configure_time_tool(${target_name}
         DEFINES ${compile_definitions}
-        COMPILE_OPTIONS ${optimize_full_flags}
         TOOLS_TARGET Core
         INSTALL_DIRECTORY "${INSTALL_LIBEXECDIR}"
         CMAKE_FLAGS