Function vkCreatePipelineCache 

pub unsafe extern "system" fn vkCreatePipelineCache(
    device: VkDevice,
    pCreateInfo: *const VkPipelineCacheCreateInfo,
    pAllocator: *const VkAllocationCallbacks,
    pPipelineCache: *mut VkPipelineCache,
) -> VkResult

Available if built with exported-prototypes.