如何使用CMAKE_INSTALL_PREFIX

Question

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 ..

CMakeCache.txt包含:( CMAKE_INSTALL_PREFIX:PATH=/usr好吗？)

现在我执行:

make
make install

所有文件仍然安装到usr/local.怎么了？

编辑:任何CMakeLists.txt项目文件中都没有CMAKE_INSTALL_PREFIX.在运行cmake之前,我从输出目录中删除了所有内容.CMakeLists.txt中的install指令如下所示:

install(TARGETS mylibrary DESTINATION lib)

Answer 1

那应该是(参见文档):

cmake -DCMAKE_INSTALL_PREFIX=/usr ..

Answer 2

有两种方法可以使用此变量:

• 将它作为命令行参数传递,就像Job提到的那样:

  cmake -DCMAKE_INSTALL_PREFIX=< install_path > ..

• 在CMakeLists.txt以下内容中为其赋值:

  SET(CMAKE_INSTALL_PREFIX < install_path >)

  但是请记住将它放在BEFORE PROJECT(< project_name>)命令之外,否则它将无法工作!

Answer 3

但是请记住将其放置在PROJECT（<project_name>）命令之前，否则将不起作用！

我使用cmake的第一周-经过几年的GNU autotools-所以我仍然在学习（最好写m4宏），但是我认为在设置项目后修改CMAKE_INSTALL_PREFIX 是更好的地方。

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")

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

第二次

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

如果我弄错了，请告诉我，我有很多学习要做。好有趣。