Clang does not support -Wl,--no-undefined

CMakeLists.txt

@@ -103,11 +103,19 @@ target_include_directories(alarm_handler
         "${PROJECT_BINARY_DIR}"
 	${Boost_INCLUDE_DIRS})
 
-set_target_properties(alarm_handler 
-    PROPERTIES 
+if(NOT (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang"))
+    set_target_properties(alarm_handler
+        PROPERTIES
         OUTPUT_NAME ${AH_NAME}
         LINK_FLAGS "-Wl,--no-undefined"
         CXX_STANDARD 17)
+else()
+    set_target_properties(alarm_handler
+        PROPERTIES
+        OUTPUT_NAME ${AH_NAME}
+        LINK_FLAGS ""
+        CXX_STANDARD 17)
+endif()
 
 if(DO_CLANG_TIDY)
     set_target_properties(alarm_handler 

test/testdevice/CMakeLists.txt

@@ -76,11 +76,19 @@ target_include_directories(testdevice
         "${PROJECT_BINARY_DIR}"
 	)
 
-set_target_properties(testdevice 
-    PROPERTIES 
+if(NOT (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang"))
+    set_target_properties(testdevice
+        PROPERTIES
         OUTPUT_NAME ${DEV_NAME}
         LINK_FLAGS "-Wl,--no-undefined"
         CXX_STANDARD 17)
+else()
+    set_target_properties(testdevice
+        PROPERTIES
+        OUTPUT_NAME ${DEV_NAME}
+        LINK_FLAGS ""
+        CXX_STANDARD 17)
+endif()
 
 target_compile_options(testdevice 
     PRIVATE "$<$<CONFIG:DEBUG>:-g>")