使用 AMD 的 Vulkan 内存分配器时出现链接器错误 (LNK2005)

Question

I have just started using AMD's VMA by including vk_mem_alloc.h in my header file with #define VMA_IMPLEMENTATION before it. But when I build the project, a lot of LNK2005 error appear.

My file structure is like

VulkanBase ( .h + .cpp ) -(Base class of)-> ExApp (.cpp)

I have declared this library in VulkanBase.h file. The errors are like all the members in vk_mem_alloc.h have already defined in ExApp.cpp . At the end of the error list, it showed that one or more multiply defined symbols found .

Does anyone have an idea? Thank you in advance.

Answer 1

the best thing to do is in you VulkanBase.h file include the vma header file and in your VulkanBase.cpp file before you include your VulkanBase.h file define the #define VMA_IMPLEMENTATION. This way you only have one implementation of vma exist and it is compiled in your VulkanBase.cpp. You can Include VulkanBase.h file in other .cpp/.h files which only has VMA declarations. Hope that helps