Fix the linkage

Author: kullingk

CMakeLists.txt

@@ -24,15 +24,19 @@ ADD_LIBRARY(tiny_ui
     src/sdl2_iodevice.h    
     src/sdl2_iodevice.cpp
 )
-target_link_libraries(tiny_ui  $<IF:$<TARGET_EXISTS:SDL2::SDL2>,SDL2::SDL2,SDL2::SDL2-static>
+target_link_libraries(tiny_ui PRIVATE
+    $<IF:$<TARGET_EXISTS:SDL2::SDL2>,SDL2::SDL2,SDL2::SDL2-static>
     $<IF:$<TARGET_EXISTS:SDL2_image::SDL2_image>,SDL2_image::SDL2_image,SDL2_image::SDL2_image-static>
-    $<IF:$<TARGET_EXISTS:SDL2_ttf::SDL2_ttf>,SDL2_ttf::SDL2_ttf,SDL2_ttf::SDL2_ttf-static)
+    $<IF:$<TARGET_EXISTS:SDL2_ttf::SDL2_ttf>,SDL2_ttf::SDL2_ttf,SDL2_ttf::SDL2_ttf-static>)
 
 if( TINY_UI_SAMPLES)
     ADD_EXECUTABLE(tiny_ui_sample
         samples/main.cpp
     )
-    target_link_libraries(tiny_ui_sample tiny_ui $<IF:$<TARGET_EXISTS:SDL2::SDL2>,SDL2::SDL2,SDL2::SDL2-static>
-    $<IF:$<TARGET_EXISTS:SDL2_image::SDL2_image>,SDL2_image::SDL2_image,SDL2_image::SDL2_image-static>
-    $<IF:$<TARGET_EXISTS:SDL2_ttf::SDL2_ttf>,SDL2_ttf::SDL2_ttf,SDL2_ttf::SDL2_ttf-static)
+    target_link_libraries(tiny_ui_sample
+     tiny_ui
+     $<IF:$<TARGET_EXISTS:SDL2::SDL2>,SDL2::SDL2,SDL2::SDL2-static>
+     $<IF:$<TARGET_EXISTS:SDL2_image::SDL2_image>,SDL2_image::SDL2_image,SDL2_image::SDL2_image-static>
+     $<IF:$<TARGET_EXISTS:SDL2_ttf::SDL2_ttf>,SDL2_ttf::SDL2_ttf,SDL2_ttf::SDL2_ttf-static>)
+
 endif()