工具链路径自适应

gcc-arm-none-eabi.cmake

@@ -5,7 +5,20 @@ set(CMAKE_SYSTEM_PROCESSOR arm)
 # Skip linker test for bare-metal (avoids _exit/_sbrk etc.)
 set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
 
-set(ARM_TOOLCHAIN_DIR "C:/Program Files/Arm/GNU Toolchain mingw-w64-x86_64-arm-none-eabi")
+# 路径检测：环境变量 → PATH
+set(ARM_TOOLCHAIN_DIR "$ENV{ARM_GCC_ROOT}" CACHE PATH "ARM GCC toolchain root")
+
+if(NOT ARM_TOOLCHAIN_DIR OR NOT EXISTS "${ARM_TOOLCHAIN_DIR}/bin/arm-none-eabi-gcc${CMAKE_EXECUTABLE_SUFFIX}")
+    find_program(_GCC arm-none-eabi-gcc)
+    if(_GCC)
+        get_filename_component(_BIN ${_GCC} DIRECTORY)
+        get_filename_component(ARM_TOOLCHAIN_DIR ${_BIN} DIRECTORY)
+    endif()
+endif()
+
+if(NOT ARM_TOOLCHAIN_DIR)
+    message(FATAL_ERROR "ARM GCC not found. Install or set ARM_GCC_ROOT env var.")
+endif()
 
 set(CMAKE_C_COMPILER    "${ARM_TOOLCHAIN_DIR}/bin/arm-none-eabi-gcc.exe")
 set(CMAKE_CXX_COMPILER  "${ARM_TOOLCHAIN_DIR}/bin/arm-none-eabi-g++.exe")