execute_process
执行一个或更多个子进程。运行一条或多条命令，使得前一条命令的标准输出以管道的方式成为下一条命令的标准输入。所有进程公用一个单独的标准错误管道。
cmd1 在ubuntu环境可以是shell的commond 如cp、mkdir之类
如：
execute_process(COMMAND mkdir ${CMAKE_CURRENT_BINARY_DIR}/libs) 创建文件夹
execute_process(COMMAND cp ${PROJECT_SOURCE_DIR}/lib/libx264.a ${CMAKE_CURRENT_BINARY_DIR}/libs) 拷贝
cmd1 填入 CMAKE_COMMAND(CMAKE_COMMAND指向CMake可执行文件的完整路径 )
拷贝指令如下：
execute_process(COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_SOURCE_DIR}/lib/libx264.a ${CMAKE_CURRENT_BINARY_DIR})
命令集合如下：
Usage: /home/user/bin/cmake -E [command] [arguments …]
Available commands:
build build_dir - build the project in build_dir.
chdir dir cmd [args]… - run command in a given directory
compare_files file1 file2 - check if file1 is same as file2
copy file destination - copy file to destination (either file or directory)
copy_directory source destination - copy directory ‘source’ content to directory ‘destination’
copy_if_different in-file out-file - copy file if input has changed
echo [string]… - displays arguments as text
echo_append [string]… - displays arguments as text but no new line
environment - display the current environment
make_directory dir - create a directory
md5sum file1 […] - compute md5sum of files
remove [-f] file1 file2 … - remove the file(s), use -f to force it
remove_directory dir - remove a directory and its contents
rename oldname newname - rename a file or directory (on one volume)
tar [cxt][vfz][cvfj] file.tar file/dir1 file/dir2 … - create a tar archive
time command [args] … - run command and return elapsed time
touch file - touch a file.
touch_nocreate file - touch a file but do not create it.
Available on UNIX only:
create_symlink old new - create a symbolic link new -> old