cmake tutorial 编译选项

[junxnone]

• 自定义编译选项
  

  CMake/Help/guide/tutorial/Step3/CMakeLists.txt

  Line 11 in 0876d54

  option(USE_MYMATH "Use tutorial provided math implementation" ON)

• 使用编译选项作为条件
  

  CMake/Help/guide/tutorial/Step3/CMakeLists.txt

  Lines 18 to 22 in 0876d54

  	if(USE_MYMATH)
  	add_subdirectory(MathFunctions)
  	list(APPEND EXTRA_LIBS MathFunctions)
  	list(APPEND EXTRA_INCLUDES "${PROJECT_SOURCE_DIR}/MathFunctions")
  	endif()

• 编译选项变量生成到 头文件中在模板文件中的定义
  

  CMake/Help/guide/tutorial/Step3/TutorialConfig.h.in

  Line 4 in 0876d54

  #cmakedefine USE_MYMATH

• 生成的头文件

#define USE_MYMATH

/* #undef USE_MYMATH */

• 生成静态库 libMathFunctions.a
  

  CMake/Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt

  Line 1 in 0876d54

  add_library(MathFunctions mysqrt.cxx)