cmake: add Intel Arc GPU support via SYCL backend

- Add sycl to the backend link loop so ggml-sycl links when built statically
- Add -fsycl link option for consumer executables (ggml-sycl links the
  SYCL runtime PRIVATE, so consumers need it on their own link line)
- Gate _FORTIFY_SOURCE=2 with NOT GGML_SYCL: the fortified __memcpy_chk
  symbol is unresolvable in SPIR-V device code and aborts kernel compilation
- Add buildsycl.sh convenience script (icx/icpx compilers)

Tested on Intel Arc A310 (DG2) with oneAPI 2026.0 + Level Zero: full TTS
generation produces correct audio output on the GPU.

CMakeLists.txt

@@ -40,8 +40,10 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 # Audio tokenizer tensor names can exceed default GGML_MAX_NAME of 64
 add_compile_definitions(GGML_MAX_NAME=128)
 
-# Harden: mark fread/fwrite/etc with warn_unused_result on all platforms
+# Harden: mark fread/fwrite/etc with warn_unused_result on all platforms.
-if(NOT MSVC)
+# Disabled for SYCL: _FORTIFY_SOURCE replaces memcpy with __memcpy_chk
+# which is unresolvable in GPU device code and aborts kernel compilation.
+if(NOT MSVC AND NOT GGML_SYCL)
     add_compile_definitions(_FORTIFY_SOURCE=2)
 endif()
 
@@ -79,7 +81,7 @@ macro(link_ggml_backends target)
     if(TARGET ggml-base)
         target_link_libraries(${target} PRIVATE ggml-base)
     endif()
-    foreach(backend cpu blas cuda metal vulkan)
+    foreach(backend cpu blas cuda metal vulkan sycl)
         if(TARGET ggml-${backend})
             get_target_property(CURRENT_BACKEND_TYPE ggml-${backend} TYPE)
             if (CURRENT_BACKEND_TYPE STREQUAL "MODULE_LIBRARY")
@@ -90,6 +92,11 @@ macro(link_ggml_backends target)
             target_link_libraries(${target} PRIVATE ggml-${backend})
         endif()
     endforeach()
+    # SYCL backend links the runtime PRIVATE, so consumers need -fsycl
+    # on their own link line to resolve libsycl.so symbols.
+    if(TARGET ggml-sycl AND GGML_SYCL)
+        target_link_options(${target} PRIVATE -fsycl)
+    endif()
     add_dependencies(${target} version)
 endmacro()
 

buildsycl.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+rm -rf build
+mkdir build
+cd build
+
+cmake .. -DGGML_SYCL=ON -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx
+cmake --build . --config Release -j "$(nproc)"