add `-DCMAKE_SYSTEM_NAME=Darwin` cmake flag (#1832)

llm/ext_server/ext_server.cpp

@@ -12,6 +12,7 @@ void llama_server_init(ext_server_params *sparams, ext_server_resp_t *err) {
 #if SERVER_VERBOSE != 1
   log_disable();
 #endif
+  LOG_TEE("system info: %s", llama_print_system_info());
   assert(err != NULL && sparams != NULL);
   err->id = 0;
   err->msg[0] = '\0';

llm/generate/gen_darwin.sh

@@ -13,7 +13,7 @@ CMAKE_DEFS="-DCMAKE_OSX_DEPLOYMENT_TARGET=11.0 -DLLAMA_METAL=on -DLLAMA_ACCELERA
 BUILD_DIR="${LLAMACPP_DIR}/build/darwin/metal"
 case "${GOARCH}" in
 "amd64")
-    CMAKE_DEFS="-DCMAKE_SYSTEM_PROCESSOR=x86_64 -DCMAKE_OSX_ARCHITECTURES=x86_64 -DLLAMA_NATIVE=off -DLLAMA_AVX=on -DLLAMA_AVX2=off -DLLAMA_AVX512=off -DLLAMA_FMA=off -DLLAMA_F16C=off ${CMAKE_DEFS}"
+    CMAKE_DEFS="-DCMAKE_SYSTEM_NAME=Darwin -DCMAKE_SYSTEM_PROCESSOR=x86_64 -DCMAKE_OSX_ARCHITECTURES=x86_64 -DLLAMA_NATIVE=off -DLLAMA_AVX=on -DLLAMA_AVX2=off -DLLAMA_AVX512=off -DLLAMA_FMA=off -DLLAMA_F16C=off ${CMAKE_DEFS}"
     ;;
 "arm64")
     CMAKE_DEFS="-DCMAKE_SYSTEM_PROCESSOR=arm64 -DCMAKE_OSX_ARCHITECTURES=arm64 ${CMAKE_DEFS}"