fix: keep CPU builds portable across x86 hosts

docs/build.md

@@ -118,6 +118,12 @@ adapters and separate `riva_server` executable are needed.
 
 The preset selects which components and ggml backend are compiled.
 
+On x86_64 hosts, CPU presets disable ggml's native-architecture optimization
+by default so portable artifacts do not require instruction sets from the build
+host. On other architectures, the preset keeps ggml's normal defaults so that
+architecture-specific kernels remain available. Pass `-DGGML_NATIVE=ON` or
+`-DGGML_NATIVE=OFF` explicitly when the target requires a different choice.
+
 Additional CMake definitions can follow the preset:
 
 ```bash

scripts/configure.sh

@@ -138,4 +138,19 @@ if [ "${#missing[@]}" -ne 0 ]; then
     exit 1
 fi
 
-cmake --preset "$PRESET" "$@"
+case "$PRESET" in
+    cpu-*)
+        case "$(uname -m)" in
+            x86_64|amd64)
+                ggml_native="$(cmake_bool_override GGML_NATIVE OFF "$@")"
+                cmake --preset "$PRESET" "-DGGML_NATIVE=$ggml_native" "$@"
+                ;;
+            *)
+                cmake --preset "$PRESET" "$@"
+                ;;
+        esac
+        ;;
+    *)
+        cmake --preset "$PRESET" "$@"
+        ;;
+esac