Fix NOTFOUND paths being added as dependencies

Fixes #930.

README.md

@@ -119,6 +119,7 @@ information on what to include when reporting a bug.
           OpenGL and OpenGL ES header macros
 - Bugfix: `glfwGetInstanceProcAddress` returned `NULL` for
           `vkGetInstanceProcAddr` when `_GLFW_VULKAN_STATIC` was enabled
+- Bugfix: Invalid library paths were used in test and example CMake files (#930)
 - [Win32] Bugfix: Undecorated windows could not be iconified by the user (#861)
 - [Win32] Bugfix: Deadzone logic could underflow with some controllers (#910)
 - [Win32] Bugfix: Bitness test in `FindVulkan.cmake` was VS specific (#928)

examples/CMakeLists.txt

@@ -3,7 +3,7 @@ link_libraries(glfw)
 
 include_directories(${glfw_INCLUDE_DIRS} "${GLFW_SOURCE_DIR}/deps")
 
-if (BUILD_SHARED_LIBS)
+if (MATH_LIBRARY)
     link_libraries("${MATH_LIBRARY}")
 endif()
 
@@ -39,7 +39,10 @@ add_executable(simple WIN32 MACOSX_BUNDLE simple.c ${ICON} ${GLAD})
 add_executable(splitview WIN32 MACOSX_BUNDLE splitview.c ${ICON} ${GLAD})
 add_executable(wave WIN32 MACOSX_BUNDLE wave.c ${ICON} ${GLAD})
 
-target_link_libraries(particles "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}")
+target_link_libraries(particles "${CMAKE_THREAD_LIBS_INIT}")
+if (RT_LIBRARY)
+    target_link_libraries(particles "${RT_LIBRARY}")
+endif()
 
 set(WINDOWS_BINARIES boing gears heightmap particles simple splitview wave)
 set(CONSOLE_BINARIES offscreen)

tests/CMakeLists.txt

@@ -3,7 +3,7 @@ link_libraries(glfw)
 
 include_directories(${glfw_INCLUDE_DIRS} "${GLFW_SOURCE_DIR}/deps")
 
-if (BUILD_SHARED_LIBS)
+if (MATH_LIBRARY)
     link_libraries("${MATH_LIBRARY}")
 endif()
 
@@ -38,8 +38,12 @@ add_executable(timeout WIN32 MACOSX_BUNDLE timeout.c ${GLAD})
 add_executable(title WIN32 MACOSX_BUNDLE title.c ${GLAD})
 add_executable(windows WIN32 MACOSX_BUNDLE windows.c ${GETOPT} ${GLAD})
 
-target_link_libraries(empty "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}")
-target_link_libraries(threads "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}")
+target_link_libraries(empty "${CMAKE_THREAD_LIBS_INIT}")
+target_link_libraries(threads "${CMAKE_THREAD_LIBS_INIT}")
+if (RT_LIBRARY)
+    target_link_libraries(empty "${RT_LIBRARY}")
+    target_link_libraries(threads "${RT_LIBRARY}")
+endif()
 
 set(WINDOWS_BINARIES empty gamma icon joysticks sharing tearing threads timeout
                      title windows)