From 5f3aa045b3f4a5e7a82949b130f2e6393a469b29 Mon Sep 17 00:00:00 2001
From: xiaojiazhu <258828110.@qq.com>
Date: Tue, 12 Mar 2024 14:45:26 -0700
Subject: [PATCH] Improve:cmake.

---
 CMakeLists.txt | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 219ef3a0..61145a71 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ include(CheckCXXCompilerFlag)
 CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
 CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
 CHECK_CXX_COMPILER_FLAG("-std=c++14" COMPILER_SUPPORTS_CXX14)
-
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
 
 # 获取所有修改过的文件
 execute_process(
@@ -26,8 +26,13 @@ execute_process(
 	OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 set(ALL_MODEFIED_FILES "")
+string(LENGTH "${MODIFIED_FILES}" GIT_RESULT_STRING_LENGTH)
+if(GIT_RESULT_STRING_LENGTH EQUAL 0)
+	message("Nothing changed.")
+else()
+	string(REPLACE "\n" ";" MODIFIED_FILES_LIST ${MODIFIED_FILES})
+endif()
 # 遍历每个文件
-string(REPLACE "\n" ";" MODIFIED_FILES_LIST ${MODIFIED_FILES})
 foreach(FILE ${MODIFIED_FILES_LIST})
 	# 检查文件扩展名，只格式化.cpp和.h文件
 	get_filename_component(FILE_EXT ${FILE} EXT)
@@ -35,7 +40,7 @@ foreach(FILE ${MODIFIED_FILES_LIST})
 	set(ALL_MODEFIED_FILES "${ALL_MODEFIED_FILES};${FILE}")
 	endif()
 endforeach()
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
+string(LENGTH "${ALL_MODEFIED_FILES}" MODIFIED_STRING_LENGTH)
 # find the clang-tidy tools
 unset(CLANG_TIDY_EXE  CACHE)
 unset(CLANG_TIDY_FIND  CACHE)
@@ -47,6 +52,7 @@ if ("${CLANG_TIDY_SUPPORT}" MATCHES "true")
 	set(CLANG_TIDY_EXE ${CLANG_TIDY_FIND} CACHE STRING INTERNAL)
 	message("CLANG_TIDY_EXE = ${CLANG_TIDY_EXE}")
 
+	if(MODIFIED_STRING_LENGTH GREATER 0)
 	add_custom_target(
 		check_modified_code
 		COMMAND ${CLANG_TIDY_EXE}
@@ -57,6 +63,7 @@ if ("${CLANG_TIDY_SUPPORT}" MATCHES "true")
 		-p ${PLATFORM_PATH}/cmake-shell
 		WORKING_DIRECTORY ${PLATFORM_PATH}
 	)
+	endif()
 	
 	else()
 	# message(FATAL_ERROR "See ${CMAKE_SOURCE_DIR_IPCSDK}/doc.")
@@ -79,6 +86,7 @@ if ("${CLANG_FORMAT_SUPPORT}" MATCHES "true")
 	set(CLANG_FORMAT_EXE ${CLANG_FORMAT_FIND} CACHE STRING INTERNAL)
 	message("CLANG_FORMAT_EXE = ${CLANG_FORMAT_EXE}")
 
+	if(MODIFIED_STRING_LENGTH GREATER 0)
 	add_custom_target(
 		format_modified_code
 		COMMAND ${CLANG_FORMAT_EXE}
@@ -86,6 +94,7 @@ if ("${CLANG_FORMAT_SUPPORT}" MATCHES "true")
 		-i ${ALL_MODEFIED_FILES}
 		WORKING_DIRECTORY ${PLATFORM_PATH}
 	)
+	endif()
 
 	else()
 	message(FATAL_ERROR "You set support clang-format, but clang-format not found.
@@ -98,10 +107,12 @@ See:${IPC_SDK_PATH}/builde/global_config.cmake")
 	endif()
 endif()
 
+if(MODIFIED_STRING_LENGTH GREATER 0)
 add_custom_target(
 	improve_modified_code
 	DEPENDS format_modified_code check_modified_code
 )
+endif()
 
 if(${TARGET_PLATFORM} MATCHES ${DEFINE_LINUX})
 # execute_process(COMMAND sh build_lvgl_for_cmakelist.sh ${TARGET_PLATFORM} ${CMAKE_SOURCE_DIR_IPCSDK} WORKING_DIRECTORY ${EXTERNAL_SOURCE_PATH}/lvglLinux-x86/)