fix: improve host compiler detection in vulkan shader build

Improve host compiler detection for vulkan shader generation:
- Add NO_CMAKE_FIND_ROOT_PATH to all compiler searches
- Consolidate compiler detection logic
- Fix Windows-specific MSVC detection
- Ensure correct compiler search in cross-compilation

Author: sparkleholic

ggml/src/ggml-vulkan/CMakeLists.txt

@@ -4,33 +4,28 @@ cmake_policy(SET CMP0114 NEW)
 find_package(Vulkan COMPONENTS glslc REQUIRED)
 
 function(detect_host_compiler)
+    find_program(GNU_C_COMPILER gcc NO_CMAKE_FIND_ROOT_PATH)
+    find_program(GNU_CXX_COMPILER g++ NO_CMAKE_FIND_ROOT_PATH)
+    find_program(CLANG_C_COMPILER clang NO_CMAKE_FIND_ROOT_PATH)
+    find_program(CLANG_CXX_COMPILER clang++ NO_CMAKE_FIND_ROOT_PATH)
+
     if (CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
-        find_program(MSVC_COMPILER cl)
-        find_program(GNU_C_COMPILER gcc)
-        find_program(GNU_CXX_COMPILER g++)
+        find_program(MSVC_COMPILER cl NO_CMAKE_FIND_ROOT_PATH)
         if (MSVC_COMPILER)
             set(HOST_C_COMPILER "${MSVC_COMPILER}" PARENT_SCOPE)
             set(HOST_CXX_COMPILER "${MSVC_COMPILER}" PARENT_SCOPE)
-        elseif (CLANG_C_COMPILER AND CLANG_CXX_COMPILER)
-            set(HOST_C_COMPILER "${CLANG_C_COMPILER}" PARENT_SCOPE)
-            set(HOST_CXX_COMPILER "${CLANG_CXX_COMPILER}" PARENT_SCOPE)
-        else()
-            message(WARNING "Neither MSVC nor clang found")
+            return()
         endif()
+    endif()
+
+    if (GNU_C_COMPILER AND GNU_CXX_COMPILER)
+        set(HOST_C_COMPILER "${GNU_C_COMPILER}" PARENT_SCOPE)
+        set(HOST_CXX_COMPILER "${GNU_CXX_COMPILER}" PARENT_SCOPE)
+    elseif (CLANG_C_COMPILER AND CLANG_CXX_COMPILER)
+        set(HOST_C_COMPILER "${CLANG_C_COMPILER}" PARENT_SCOPE)
+        set(HOST_CXX_COMPILER "${CLANG_CXX_COMPILER}" PARENT_SCOPE)
     else()
-        find_program(CLANG_C_COMPILER clang)
-        find_program(CLANG_CXX_COMPILER clang++)
-        find_program(GNU_C_COMPILER gcc)
-        find_program(GNU_CXX_COMPILER g++)
-        if (GNU_C_COMPILER AND GNU_CXX_COMPILER)
-            set(HOST_C_COMPILER "${GNU_C_COMPILER}" PARENT_SCOPE)
-            set(HOST_CXX_COMPILER "${GNU_CXX_COMPILER}" PARENT_SCOPE)
-        elseif (CLANG_C_COMPILER AND CLANG_CXX_COMPILER)
-            set(HOST_C_COMPILER "${CLANG_C_COMPILER}" PARENT_SCOPE)
-            set(HOST_CXX_COMPILER "${CLANG_CXX_COMPILER}" PARENT_SCOPE)
-        else()
-            message(WARNING "Neither clang nor gcc found")
-        endif()
+        message(WARNING "No suitable host compiler found")
     endif()
 endfunction()