Merge branch 'feature/modify_cmake_script_for_esp8266' into 'master'

feat(cmake): Modify cmake script for esp8266

See merge request sdk/ESP8266_RTOS_SDK!137

Author: wujiangang

tools/cmake/idf_functions.cmake

@@ -128,8 +128,8 @@ function(idf_verify_environment)
     # Warn if the toolchain version doesn't match
     #
     # TODO: make these platform-specific for diff toolchains
-    gcc_version_check("5.2.0")
-    crosstool_version_check("1.22.0-80-g6c4433a")
+    #gcc_version_check("5.2.0")
+    #crosstool_version_check("1.22.0-80-g6c4433a")
 
 endfunction()
 

tools/cmake/project.cmake

@@ -83,7 +83,8 @@ macro(project name)
     # Now the configuration is loaded, set the toolchain appropriately
     #
     # TODO: support more toolchains than just ESP32
-    set(CMAKE_TOOLCHAIN_FILE $ENV{IDF_PATH}/tools/cmake/toolchain-esp32.cmake)
+    #set(CMAKE_TOOLCHAIN_FILE $ENV{IDF_PATH}/tools/cmake/toolchain-esp32.cmake)
+    set(CMAKE_TOOLCHAIN_FILE $ENV{IDF_PATH}/tools/cmake/toolchain-esp8266.cmake)
 
     # Declare the actual cmake-level project
     _project(${name} ASM C CXX)

tools/cmake/toolchain-esp8266.cmake

@@ -0,0 +1,8 @@
+set(CMAKE_SYSTEM_NAME Generic)
+
+set(CMAKE_C_COMPILER xtensa-lx106-elf-gcc)
+set(CMAKE_CXX_COMPILER xtensa-lx106-elf-g++)
+set(CMAKE_ASM_COMPILER xtensa-lx106-elf-gcc)
+set(CMAKE_OBJCOPY_COMPILER xtensa-lx106-elf-objcopy)
+
+set(CMAKE_EXE_LINKER_FLAGS "-nostdlib" CACHE STRING "Linker Base Flags")