Question

据我了解，这些变量用于项目由子目录组成的情况，例如每个子目录还具有CMakeLists.txt文件。

CMAKE_CURRENT_SOURCE_DIR

是指正在处理的源主管的路径？和

CMAKE_SOURCE_DIR

是指最高级的源目录？我不确定。

Answer 1

CMAKE_SOURCE_DIR是cmake最初被调用的地方，CMAKE_CURRENT_SOURCE_DIR是cmake当前正在工作的地方。例如，如果您使用add_subdirectory命令将对项目的依赖项包括在内，则该依赖项将具有自己的CMAKE_CURRENT_SOURCE_DIR，但CMAKE_SOURCE_DIR将保持不变。

扩展一些程序员的评论，想象一下您在项目的不同目录中有以下三个CMakeFiles

CMakeLists.txt

cmake_minimum_required(VERSION 3.12)

message("root dir CMAKE_SOURCE_DIR = ${CMAKE_SOURCE_DIR}")
message("root dir CMAKE_CURRENT_SOURCE_DIR = ${CMAKE_CURRENT_SOURCE_DIR}")

add_subdirectory(sub1)
add_subdirectory(sub2)

sub1 / CMakeLists.txt

message("sub1 dir CMAKE_SOURCE_DIR = ${CMAKE_SOURCE_DIR}")
message("sub1 dir CMAKE_CURRENT_SOURCE_DIR = ${CMAKE_CURRENT_SOURCE_DIR}")

sub2 / CMakeLists.txt

message("sub2 dir CMAKE_SOURCE_DIR = ${CMAKE_SOURCE_DIR}")
message("sub2 dir CMAKE_CURRENT_SOURCE_DIR = ${CMAKE_CURRENT_SOURCE_DIR}")

在 root 目录上运行cmake .会给我输出

root dir CMAKE_SOURCE_DIR = /Users/henrique/cmake_tests
root dir CMAKE_CURRENT_SOURCE_DIR = /Users/henrique/cmake_tests
sub1 dir CMAKE_SOURCE_DIR = /Users/henrique/cmake_tests
sub1 dir CMAKE_CURRENT_SOURCE_DIR = /Users/henrique/cmake_tests/sub1
sub2 dir CMAKE_SOURCE_DIR = /Users/henrique/cmake_tests
sub2 dir CMAKE_CURRENT_SOURCE_DIR = /Users/henrique/cmake_tests/sub2

现在，如果我在 sub1 目录上运行cmake .，则两个变量的值相同：

sub1 dir CMAKE_SOURCE_DIR = /Users/henrique/cmake_tests/sub1
sub1 dir CMAKE_CURRENT_SOURCE_DIR = /Users/henrique/cmake_tests/sub1

CMAKE_CURRENT_SOURCE_DIR和CMAKE_SOURCE_DIR变量之间的区别？

1 个答案: