CODEWITHSUNDEEP
cmake
edovino
edovino

Reputation: 3325

Set output directory for CMake OBJECT libraries

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

add_library(core OBJECT ${sourcefiles})

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

add_library(sharedlib SHARED $<TARGET_OBJECTS:core>)

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)

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...

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

Upvotes: 3

Views: 9960

Answers (1)

Florian
Florian

Reputation: 42842

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):

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

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_
)

References

Upvotes: 4

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