fix: always use MSVC for Vulkan on Windows x64

Author: giladgd

docs/guide/Vulkan.md

@@ -59,6 +59,13 @@ If you see `Vulkan used VRAM` in the output, it means that Vulkan support is wor
 
   :::
 
+* :::details Windows only: enable long paths support
+  Open cmd as Administrator and run this command:
+  ```shell
+  reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem" /v "LongPathsEnabled" /t REG_DWORD /d "1" /f  
+  ```
+  :::
+
 ### Building From Source
 When you use the [`getLlama`](../api/functions/getLlama) method, if there's no binary that matches the provided options, it'll automatically build `llama.cpp` from source.
 

src/bindings/utils/compileLLamaCpp.ts

@@ -59,7 +59,10 @@ export async function compileLlamaCpp(buildOptions: BuildOptions, compileOptions
         : buildFolderName.withoutCustomCmakeOptions;
     const useWindowsLlvm = (
         platform === "win" &&
-        (buildOptions.gpu === false || buildOptions.gpu === "vulkan") &&
+        (
+            buildOptions.gpu === false ||
+            (buildOptions.gpu === "vulkan" && buildOptions.arch === "arm64") // Vulkan can't be compiled on Windows x64 with LLVM ATM
+        ) &&
         !ignoreWorkarounds.includes("avoidWindowsLlvm") &&
         !buildOptions.customCmakeOptions.has("CMAKE_TOOLCHAIN_FILE") &&
         !requiresMsvcOnWindowsFlags.some((flag) => buildOptions.customCmakeOptions.has(flag))
@@ -105,7 +108,7 @@ export async function compileLlamaCpp(buildOptions: BuildOptions, compileOptions
 
                 if (toolchainFile != null &&
                     buildOptions.gpu === "vulkan" &&
-                    useWindowsLlvm &&
+                    (useWindowsLlvm || (platform === "win" && buildOptions.arch === "arm64")) &&
                     !cmakeCustomOptions.has("GGML_VULKAN_SHADERS_GEN_TOOLCHAIN")
                 )
                     cmakeToolchainOptions.set("GGML_VULKAN_SHADERS_GEN_TOOLCHAIN", toolchainFile);