effort to have no warnings once again

CMakeLists.txt

@@ -175,20 +175,19 @@ function(give_options_without_warnings target)
         target_compile_options(${target} PUBLIC
                                          ${BUILD_FLAGS}
                                          $<$<CONFIG:Release>:${BUILD_FLAGS_RELEASE}>
-                                         $<$<CONFIG:Debug>:${BUILD_FLAGS_DEBUG}>
-                                         $<$<BOOL:${LINUX}>:-Wl,-rpath,$ORIGIN/>)
+                                         $<$<CONFIG:Debug>:${BUILD_FLAGS_DEBUG}>)
 
         target_link_options(${target} PUBLIC
                                       ${BUILD_FLAGS}
                                       # -Wl,--no-undefined # TODO: use later for implementing no-libc
                                       $<$<CONFIG:Release>:${BUILD_FLAGS_RELEASE}>
                                       $<$<CONFIG:Debug>:${BUILD_FLAGS_DEBUG}>
-                                      $<$<BOOL:${LINUX}>:-Wl,-rpath,$ORIGIN/>
                                       -Bsymbolic-functions
                                       -Wl,--hash-style=gnu)
 
         target_compile_definitions(${target} PRIVATE
-                                             $<$<BOOL:${TWN_FEATURE_DYNLIB_GAME}>:TWN_FEATURE_DYNLIB_GAME>)
+                                             $<$<BOOL:${TWN_FEATURE_DYNLIB_GAME}>:TWN_FEATURE_DYNLIB_GAME>
+                                             _GNU_SOURCE)
 endfunction()
 
 
@@ -200,7 +199,8 @@ function(give_options target)
                 -Wno-padded
                 -Wno-declaration-after-statement
                 -Wno-unsafe-buffer-usage
-                -Wno-unused-command-line-argument)
+                -Wno-unused-command-line-argument
+                -Wno-covered-switch-default)
 
         set(WARNING_FLAGS
                 -Wall
@@ -264,6 +264,8 @@ function(use_townengine target sources output_directory)
                 # launcher binary, loads game and engine shared library
                 add_executable(${target} ${TWN_ROOT_DIR}/src/twn_main.c)
 
+                target_compile_options(${target} PRIVATE $<$<BOOL:${LINUX}>:-Wl,-rpath,$ORIGIN/>)
+
                 # todo: copy instead?
                 # put libtownengine.so alongside the binary
                 set_target_properties(${TWN_TARGET} PROPERTIES