[CANN] Adapt to dynamically loadable backends mechanism

Author: leo-pony

ggml/include/ggml-cann.h

@@ -33,6 +33,9 @@ extern "C" {
  * @brief Maximum number of CANN devices supported.
  */
 #define GGML_CANN_MAX_DEVICES 16
+#define GGML_CANN_NAME "CANN"
+
+GGML_API ggml_backend_reg_t ggml_backend_cann_reg(void);
 
 /**
  * @brief Initializes the CANN backend for a specified device.

ggml/src/ggml-backend.cpp

@@ -561,6 +561,10 @@ void * ggml_backend_reg_get_proc_address(ggml_backend_reg_t reg, const char * na
 #  include "ggml-amx.h"
 #endif
 
+#ifdef GGML_USE_CANN
+#include "ggml-cann.h"
+#endif
+
 struct ggml_backend_registry {
     std::vector<ggml_backend_reg_t> backends;
     std::vector<ggml_backend_dev_t> devices;
@@ -584,11 +588,15 @@ struct ggml_backend_registry {
 #ifdef GGML_USE_RPC
         register_backend(ggml_backend_rpc_reg());
 #endif
+
 #ifdef GGML_USE_AMX
         register_backend(ggml_backend_amx_reg());
 #endif
 
-        // TODO: kompute, cann
+#ifdef GGML_USE_CANN
+        register_backend(ggml_backend_cann_reg());
+#endif
+        // TODO: kompute
 
         register_backend(ggml_backend_cpu_reg());
     }