设置CMake OBJECT库的输出目录 [英] Set output directory for CMake OBJECT libraries

问题描述

在我的CMake文件中，我指定了一个对象库:

In my CMake file I've specified an object library:

add_library(core OBJECT ${sourcefiles})

我将在共享库中进一步参考这组目标文件:

I refer to this set of object file in a shared library further on:

add_library(sharedlib SHARED $<TARGET_OBJECTS:core>)

这很好，但是我想在不同项目之间重用构建工件.通过在sharedlib上设置LIBRARY_OUTPUT_PROPERTY，我可以将生成的.so文件定向到公共目录:

This works fine, however I would like to reuse the build artefacts between different project. By setting the LIBRARY_OUTPUT_PROPERTY on the sharedlib I can direct the generated .so file to a common directory:

set_target_properties(sharedlib PROPERTIES LIBRARY_OUTPUT_NAME /commondir)

但是，对于核心(OBJECT)库，我似乎做不到相同的事情-.o文件始终以(特定于项目的)生成的cmake-build目录结尾.这意味着每个项目无论如何都必须重建(大型)共享库...

However, I cannot seem to do the same thing for the core (OBJECT) library - the .o files always end up in the (project-specific) generated cmake-build directories. This means every project will have to rebuild the (large) shared library anyway...

我做错什么了吗，还是用CMake还行吗?

Am I doing something wrong, or is this not (yet?) possible with CMake?

推荐答案

您不能在CMake中更改对象/中间文件的输出目录.这是设计使然(允许多个相同的输出名称合而为一)项目):

You can't change the output directory of object/intermediate files in CMake. That's by design (to allow several identical output names in one project):

无法更改该名称.CMake在以下位置创建源树的精确副本二叉树."

"There is no way to change that name. CMake creates an exact copy of the source tree in the binary tree."

但是在3.9版本中，CMake学会了导出对象库:

But with version 3.9 CMake learned to export object libraries:

cmake_minimum_required(VERSION 3.9)

project(CorePorject)

file(WRITE "core.cpp" "")
file(WRITE "helper.cpp" "")
set(sourcefiles "core.cpp" "helper.cpp")

add_library(core OBJECT ${sourcefiles})    

export(
    TARGETS core
    FILE core.cmake 
    NAMESPACE Core_
)

参考

• 使用CMake设置C ++对象文件的输出位置
• 设置中间文件的目录(例如.obj)在CMake中
• 使cmake库自动被其他cmake包访问

这篇关于设置CMake OBJECT库的输出目录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！