与添加的消毒剂重新配置的cmake并非触发忍者以重新编译
让我们假设一个最小的顶级cmakelists.txt类似：
1 cmake_minimum_required(VERSION 3.22)
2 set(CMAKE_CXX_STANDARD 20)
3
4 project(stackoverflow LANGUAGES CXX C)
5
6 add_executable(prog src/main.cpp)
7
8 option(ENABLE_SANITIZER "Enables sanitizer" OFF)
9 if(ENABLE_SANITIZER)
10 target_compile_options(prog PUBLIC -fsanitize=address)
11 target_link_options(prog PUBLIC -fsanitize=address)
12 endif()
其中选项enable_sanitizer在构建中添加了地址消毒剂。
当我使用消毒剂配置
cmake -S . -B ./build -G "Ninja Multi-Config" -DENABLE_SANITIZER=ON
并随着
cmake --build ./build/ --target prog
应有的一切编译，但是当我重新配置
cmake -S . -B ./build -G "Ninja Multi-Config"
会发生这种情况：
ninja: no work to do.
并再次构建它时，忍者告诉我，当我明确删除编译选项和链接选项时，为什么 为什么会发生这种情况？
Let's assume a minimal top level CMakeLists.txt like this:
1 cmake_minimum_required(VERSION 3.22)
2 set(CMAKE_CXX_STANDARD 20)
3
4 project(stackoverflow LANGUAGES CXX C)
5
6 add_executable(prog src/main.cpp)
7
8 option(ENABLE_SANITIZER "Enables sanitizer" OFF)
9 if(ENABLE_SANITIZER)
10 target_compile_options(prog PUBLIC -fsanitize=address)
11 target_link_options(prog PUBLIC -fsanitize=address)
12 endif()
Where the option ENABLE_SANITIZER adds an address sanitizer to the build.
When I configure with the sanitizer with
cmake -S . -B ./build -G "Ninja Multi-Config" -DENABLE_SANITIZER=ON
and build with
cmake --build ./build/ --target prog
everything compiles as it should, but when I reconfigure with
cmake -S . -B ./build -G "Ninja Multi-Config"
and build it again, ninja tells me that there is nothing to do:
ninja: no work to do.
Why does this happen when I clearly removed a compile option and link option?
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设置变量时，将其设置在CACHE
CMAKECACHE.TXT中。当您在重新配置时不重置它时，它将保留其先前的值。选项.... OFF，仅将选项设置为OFF如果未设置。甚至set（enable_sanitizer off）will 如果在缓存中设置该变量，则仅set（.... cache'“”“”“”“ force），请参阅文档。When you set a variable, it is set inside cache
CMakeCache.txt. When you don't reset it when reconfiguring, it preserves its previous value. Theoption.... OFF, only set's the option toOFFif it is unset. Evenset(ENABLE_SANITIZER OFF)will not set the variable if it is in cache, onlyset(.... CACHE "" "" FORCE), refer to documentation.