Linux 如何使用 CMAKE_INSTALL_PREFIX
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How to use CMAKE_INSTALL_PREFIX
提问by Alex F
I want to generate Makefile with install target, making installation to /usr instead of default /usr/local. Assuming that build directory is done in the source subdirectory, I execute:
我想用安装目标生成 Makefile，安装到 /usr 而不是默认的 /usr/local。假设构建目录在源子目录中完成，我执行：
cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr ..
cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr ..
CMakeCache.txt contains: CMAKE_INSTALL_PREFIX:PATH=/usr(OK?)
CMakeCache.txt 包含：（CMAKE_INSTALL_PREFIX:PATH=/usr好吗？）
Now I execute:
现在我执行：
make make install
All files are still installed to usr/local. What is wrong?
所有文件仍然安装到 usr/local。怎么了？
Edit: There is no CMAKE_INSTALL_PREFIX in any of CMakeLists.txt project files. Before running cmake, I delete everything from the output directory. install directives in CMakeLists.txt look like:
编辑：任何 CMakeLists.txt 项目文件中都没有 CMAKE_INSTALL_PREFIX。在运行 cmake 之前，我删除了输出目录中的所有内容。CMakeLists.txt 中的安装指令如下所示：
install(TARGETS mylibrary DESTINATION lib)
install(TARGETS mylibrary DESTINATION lib)
回答by ryan_tu
There are two ways to use this variable:
有两种方法可以使用这个变量：
passing it as a command line argument just like Job mentioned:
cmake -DCMAKE_INSTALL_PREFIX=< install_path > ..assigning value to it in
CMakeLists.txt:SET(CMAKE_INSTALL_PREFIX < install_path >)But do remember to place it BEFORE
PROJECT(< project_name>)command, otherwise it will not work!
就像 Job 提到的那样，将它作为命令行参数传递：
cmake -DCMAKE_INSTALL_PREFIX=< install_path > ..为它赋值
CMakeLists.txt：SET(CMAKE_INSTALL_PREFIX < install_path >)但是一定要记得把它放在
PROJECT(< project_name>)命令之前，否则它不会工作！
回答by Jim
But do remember to place it BEFORE PROJECT(< project_name>) command, otherwise it will not work!
但是一定要记得把它放在 BEFORE PROJECT(<project_name>) 命令之前，否则它不会工作！
My first week of using cmake - after some years of GNU autotools - so I am still learning (better then writing m4 macros), but I think modifying CMAKE_INSTALL_PREFIX aftersetting project is the better place.
我使用 cmake 的第一周 - 经过几年的 GNU autotools - 所以我仍在学习（比编写 m4 宏更好），但我认为在设置项目后修改 CMAKE_INSTALL_PREFIX是更好的地方。
CMakeLists.txt
CMakeLists.txt
cmake_minimum_required (VERSION 2.8)
set (CMAKE_INSTALL_PREFIX /foo/bar/bubba)
message("CIP = ${CMAKE_INSTALL_PREFIX} (should be /foo/bar/bubba")
project (BarkBark)
message("CIP = ${CMAKE_INSTALL_PREFIX} (should be /foo/bar/bubba")
set (CMAKE_INSTALL_PREFIX /foo/bar/bubba)
message("CIP = ${CMAKE_INSTALL_PREFIX} (should be /foo/bar/bubba")
First run (no cache)
首次运行（无缓存）
CIP = /foo/bar/bubba (should be /foo/bar/bubba
-- The C compiler identification is GNU 4.4.7
-- etc, etc,...
CIP = /usr/local (should be /foo/bar/bubba
CIP = /foo/bar/bubba (should be /foo/bar/bubba
-- Configuring done
-- Generating done
Second run
第二次运行
CIP = /foo/bar/bubba (should be /foo/bar/bubba
CIP = /foo/bar/bubba (should be /foo/bar/bubba
CIP = /foo/bar/bubba (should be /foo/bar/bubba
-- Configuring done
-- Generating done
Let me know if I am mistaken, I have a lot of learning to do. It's fun.
如果我弄错了，请告诉我，我有很多学习要做。好有趣。
