Cleanup

Cleanup of 8bdb105897.

Add build macro to configuration header and documentation.  Add
corresponding CMake option.  Add change log entry and credit.  Add
loader static library to link dependencies and add detection to
FindVulkan.cmake.

CMakeLists.txt

@@ -25,6 +25,7 @@ option(GLFW_BUILD_EXAMPLES "Build the GLFW example programs" ON)
 option(GLFW_BUILD_TESTS "Build the GLFW test programs" ON)
 option(GLFW_BUILD_DOCS "Build the GLFW documentation" ON)
 option(GLFW_INSTALL "Generate installation target" ON)
+option(GLFW_VULKAN_STATIC "Use the Vulkan loader statically linked into application" OFF)
 option(GLFW_DOCUMENT_INTERNALS "Include internals in documentation" OFF)
 
 if (WIN32)
@@ -57,6 +58,10 @@ else()
     set(GLFW_LIB_NAME glfw3)
 endif()
 
+if (GLFW_VULKAN_STATIC)
+    set(_GLFW_VULKAN_STATIC 1)
+endif()
+
 list(APPEND CMAKE_MODULE_PATH "${GLFW_SOURCE_DIR}/CMake/modules")
 
 find_package(Threads REQUIRED)
@@ -148,6 +153,21 @@ else()
     message(FATAL_ERROR "No supported platform was detected")
 endif()
 
+#--------------------------------------------------------------------
+# Add Vulkan static library if requested
+#--------------------------------------------------------------------
+if (GLFW_VULKAN_STATIC)
+    if (VULKAN_FOUND AND VULKAN_STATIC_LIBRARY)
+        list(APPEND glfw_LIBRARIES ${VULKAN_STATIC_LIBRARY})
+    else()
+        if (BUILD_SHARED_LIBS OR GLFW_BUILD_EXAMPLES OR GLFW_BUILD_TESTS)
+            message(FATAL_ERROR "Vulkan loader static library not found")
+        else()
+            message(WARNING "Vulkan loader static library not found")
+        endif()
+    endif()
+endif()
+
 #--------------------------------------------------------------------
 # Find and add Unix math and time libraries
 #--------------------------------------------------------------------