CMake:如何在包含的标头更改时自动重建 .obj 文件

从我自己的搜索中，我不确定"正常"行为是什么： 当关联的源文件中包含的标头发生更改时，CMake 通常会重建 .obj 文件吗？ 因为它在我的项目中根本没有这样做。这是我的顶级CMakeList.txt：

cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
enable_language(CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# project and binary name
project("myProjectName")

# compiler specific warnings
# and warnings are treated as errors
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
set(warnings "-Wall -Wextra -Werror")
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
set(warnings "/W4 /WX /EHsc")
endif()
if (NOT CONFIGURED_ONCE)
set(CMAKE_CXX_FLAGS "${warnings}"
CACHE STRING "Flags used by the compiler during all build types." FORCE)
set(CMAKE_C_FLAGS   "${warnings}"
CACHE STRING "Flags used by the compiler during all build types." FORCE)
endif()
# default build-type is Debug:
if (NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE "Debug")
endif()

# =============================
# libraries
# =============================
# external
# eigen numerics library
find_package (Eigen3 3.3 REQUIRED NO_MODULE)
set( EIGEN Eigen3::Eigen )
# some internal libraries here
set( LIB_NAME_1 lib1 )
set( LIB_NAME_2 lib2 )

# =============================
# directory configuration
# =============================
# for finding libraries and such in the project's subdirectories
# all paths are prepended with the project's root directory
set(CMAKE_PREFIX_PATH ${CMAKE_SOURCE_DIR})
# specifiying output directories 
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
#set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
# the last one is disabled to allow for tests in a different directory
# include paths
include_directories(
${CMAKE_SOURCE_DIR}/include
${CMAKE_SOURCE_DIR}/lib # I put header-only libraries there
${CMAKE_SOURCE_DIR}/src # for template definitions
)

# =============================
# unit test configuration
# =============================
# enable_testing() sets the internal flag "CMAKE_TESTING_ENABLED" to 1
# add_test() commands are only run when enable_testing() has executed.
# here, it is only executed in debug mode
if(CMAKE_BUILD_TYPE MATCHES Debug)
enable_testing()
endif()

# the unit test framework used here is "Catch2" (single header file "catch.hpp")
# (https://github.com/catchorg/Catch2)
if ( ${CMAKE_TESTING_ENABLED} )
message( "-- Tests are enabled" )
set( UNIT_TEST_LIB catch2 )
endif()

# =============================
# subdir calls
# =============================
# the second parameter specifies the output path for binaries.
# however, the respective CMAKE_XYZ_OUTPUT_DIRECTORY takes precedence
add_subdirectory(lib)
add_subdirectory(src bin)
if ( ${CMAKE_TESTING_ENABLED} )
add_subdirectory(tests tests)
endif()

然后我有另一个 CMakeLists.txt在 lib、src 和测试中。这些命令仅包含使用相应源文件的addLibrary、addExecutable和targetLinkLibraries命令。除了在"测试"中，还有addTest和addCustomCommand使单元测试在构建后运行

。问题是：我是否错过了某些内容，并且应该在标题更改时重建(1(？还是这是正常行为(2(？

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