external: fix compilation of Vulkan headers on 32-bit Windows.

doc/changelog.dox

@@ -54,6 +54,10 @@ See also:
     recognize also uppercase file extensions (see
     [mosra/magnum#312](https://github.com/mosra/magnum/pull/312))
 
+@subsection changelog-latest-bugfixes Bug fixes
+
+-   Fixed compilation of the @ref Vk library on 32-bit Windows
+
 @section changelog-2019-01 2019.01
 
 Released 2019-02-04, tagged as

src/MagnumExternal/Vulkan/flextVk.cpp

@@ -33,7 +33,7 @@ FlextVkInstance flextVkInstance{};
 FlextVkDevice flextVkDevice{};
 
 void flextVkInit() {
-    flextvkEnumerateInstanceVersion = reinterpret_cast<VkResult(*)(uint32_t*)>(vkGetInstanceProcAddr(nullptr, "vkEnumerateInstanceVersion"));
+    flextvkEnumerateInstanceVersion = reinterpret_cast<VkResult(VKAPI_PTR*)(uint32_t*)>(vkGetInstanceProcAddr(nullptr, "vkEnumerateInstanceVersion"));
 }
 
 void flextVkInitInstance(VkInstance instance, FlextVkInstance* data) {

src/MagnumExternal/Vulkan/flextVk.cpp.template

@@ -48,7 +48,7 @@ void flextVkInit() {
     @for f in funcs:
     @if f.name in ['EnumerateInstanceVersion']:
     flextvk@f.name = reinterpret_cast<@f.returntype\
-(*)(@f.param_type_list_string())>(vkGetInstanceProcAddr(nullptr, "vk@f.name"));
+(VKAPI_PTR*)(@f.param_type_list_string())>(vkGetInstanceProcAddr(nullptr, "vk@f.name"));
     @end
     @end
     @end