if (NOT TARGET Catch2) project(Catch2 CXX) set(CMAKE_CXX_STANDARD 11) add_library(${PROJECT_NAME} INTERFACE) target_include_directories(${PROJECT_NAME} INTERFACE ${CMAKE_C files: add_library(Catch2::Catch2 ALIAS Catch2) # This one is historical, left over from when ApprovalTests.cpp was first created. # We could encourage users to move away from it. add_library(catch2_ALIAS_Catch2)

set(LIB_NAME ApprovalTests) add_library(${LIB_NAME} INTERFACE) target_include_directories(${LIB_NAME} INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}) add_library(${LIB_NAME}::${LIB_NAME} ALIAS ${LIB_NAME})

set(LIB_NAME shared_code) set(CMAKE_CXX_STANDARD 17) add_library(${LIB_NAME} SVGDrawing.cpp SVGDrawing.h ComplexOperation.cpp ComplexOperation.h HelloApprovals.cpp HelloApprovals FileUtilities.h Logger.cpp Logger.h StringUtilities.cpp StringUtilities.h ) add_library( ${LIB_NAME}:${LIB_NAME} ALIAS ${LIB_NAME} ) target_include_directories(${LIB_NAME}

printf("hello, mylib!\n"); 6 } 改进：mylib 作为一个静态库 CMakeLists.txt main.cpp | mylib.cpp 1 add_library(mylib STATIC mylib.cpp) 3 add_executable(main main.cpp) 5 target link libraries(main PUBLIC mylib) ~/Codes/course/11/00 (master) $ 改进：mylib 作为一个动态库 CMakeLists.txt main.cpp | mylib.cpp 1 add_library(mylib SHARED mylib.cpp) 3 add_executable(main main.cpp) 5 target link libraries(main PUBLIC mylib) 改进：mylib 作为一个对象库 对象库类似于静态库，但不生成 .a 文件，只由 CMake 记住该库生成了哪些对象文件 CMakeLists.txt main.cpp | mylib.cpp 1 add_library(mylib OBJECT mylib.cpp) 3 add_executable(main main.cpp) 5 target link libraries(main PUBLIC mylib)

implementation of add (from add.cpp, which will be an add.o file), we can use the add function. 1 // add_library/add.hpp 2 #pragma once 4 // Contains only function declarations 5 // Note: int add(int, of add (from add.cpp, which will be an add.o file), we can use the add function. #### 1 // add_library/add.hpp 2 #pragma once 3 4 // Contains only function declarations 5 // Note: int add(int,int) is it's best to give 7 // names to parameters in declaration. 8 int add(int a, int b); 1 // add_library/add.cpp 2 3 // Include 'add.hpp' and provide 4 // definition for our function. 5 #include

## {fmt} library For experimentation: fork of {fmt} using the new CMake module capabilities add_library(fmt) target_sources(fmt) FILE_SET fmt_module TYPE CXX_MODULES FILES src/fmt.cc  target_compile_features(fmt PUBLIC cxx_std_20) add_library(fmt::fmt ALIAS fmt)  # Create imported target fmt::fmt add_library(fmt::fmt SHARED IMPORTED) set_target_properties(fmt::fmt PROPERTIES CXX_extensions "OFF"

dyndep support added to ninja, merged into 1.10 (released Jan 2020) ## C++ Modules: Example Target add_library(A) target_sources(A) PRIVATE a2.cpp a3.cpp PRIVATE FILE_SET CXX_MODULES FILES a1.cpp) files" ## C++ Modules: Example Project add_library(A) # add sources to A add_library(B) # add sources to B target_link_libraries(B PRIVATE A) add_library(C) # add sources to C target_link_libraries(C EXPORT_BUILD_DATABASE property on targets set(CMAKE_EXPORT_BUILD_DATABASE 1) find_package(WithModules) add_library(A) # add sources to A target_link_libraries(A PRIVATE WithModules::WithModules) ## Build Databases:

问题是，我应该把这两条指令写在工程的 CMakeLists.txt 还是 src 目录下的 CMakeLists.txt，把握一个简单的原则，在哪里 ADD_EXECUTABLE 或 ADD_LIBRARY，如果需要改变目标存放路径，就在哪里加入上述的定义。 在这个例子里，当然就是指 src 下的 CMakeLists.txt 了。 4. 如何安装。 安装的需要有两种，一种是从代码编译后直接 ..] [COMPONENT ] [OPTIONAL] [] [...] 参数中的 TARGETS 后面跟的就是我们通过 ADD_EXECUTABLE 或者 ADD_LIBRARY 定义的目标文件，可能是可执行二进制、动态库、静态库。 目标类型也就相对应的有三种，ARCHIVE 特指静态库，LIBRARY 特指动态库，RUNTIME 特指可执行目标二进制。 DESTINATION SET(LIBRARY OUTPUT PATH <路径>) 来指定一个新的位置。 这两者的区别我们上一节已经提到了，所以，这里不再赘述，下面，我们解释一下一个新的指令 ADD LIBRARY ADD_LIBRARY(libname [SHARED|STATIC|MODULE] [EXCLUDE_FROM_ALL] source1 source2 ... sourceN) 你不需要写全 libhello

[Image](/uploads/documents/c/2/6/e/c26ec0084396c02bc15cec03c0c8e179/p10_1.jpg) set(CMAKE_CXX_STANDARD 20) add_library(my_module MODULE my_module.cpp) target_sources(my_module PRIVATE my_module.ixx) Make sure to s> ## Header Only Libraries (with FILE SET) add_library(Eigen INTERFACE) target_sources(Eigen INTERFACE FILE_SET HEADERS BASE_DIRS src FILES src/eigen CMake cmake_minimum_required(VERSION 3.23) project(simple CXX) set(CMAKE_CXX_STANDARD 20) add_library(simple) target_sources(simple PRIVATE FILE_SET cxx_modules TYPE CXX_MODULES FILES A.cpp B.cpp

_1.jpg) ## The target and its "usage requirements" are at the heart of Modern CMake add_library(MathFunctions MathFunctions.css) target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH") "USE_MYMATH") target_compile_definitions(MathFunctions PUBLIC "MYMATH_REQUIRED_FLAG") add_library(SqrtLibrary STATIC mysqrt.css) target_link_libraries(MathFunctions PUBLIC SqrtLibrary) add_executable(Tutorial MathFunctions/libSqrtLibrary.a && : ## Library is treated the same: built-in source tree or prebuilt add_library(bar) # part of the build find_package(bar REQUIRED) # external to the build add_executable(foo)