How to define a cmake macro in a sub_directory that uses the CURRENT_SOURCE_DIR?

Question

What I want to do is to create a CMakeLists.txt that defines a convenience macro to use in parent scope. I can use the macro just fine. However, I used the ${CMAKE_CURRENT_SOURCE_DIR} which is unfortunately not the directory of the CMake script the macro is defined in, but the one it is called from. Is there any way I can change that?

MWE

cmake_minimum_required(VERSION 3.6)
project(git_info CXX)
macro(do_stuff)
    message("This CMakeLists.txt file is in ${CMAKE_CURRENT_SOURCE_DIR}")
endmacro()

One ugly way I found was to export variables to the parent scope that contain the path and use that in the macro. But I would prefer to only export the macro definition, if possible, to keep things clean.

Edit: To clarify a bit. I have one folder with my top-levelCMakeLists.txt and one folder (my_folder) inside with the above MWE CMakeLists.txt. The top-level CMakeLists.txt looks as follows:

cmake_minimum_required(VERSION 3.6)
project(top_project CXX)
add_subdirectory(my_folder)
do_stuff()

score 2 · Accepted Answer · edited May 23 '17 at 11:46

2

You have to transfer CMAKE_CURRENT_LIST_DIR outside the macro into another variable or - in your case - a user defined global property:

set_property(GLOBAL PROPERTY DoStuffPath "${CMAKE_CURRENT_LIST_DIR}")

macro(do_stuff)
    get_property(_my_marcros_file GLOBAL PROPERTY DoStuffPath)
    message("This CMakeLists.txt file is in ${_my_marcros_file}")
endmacro()

That also works when the macros are defined in a file added with include().

References

edited May 23 '17 at 11:46

Community

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1

answered Mar 13 '17 at 08:58

Florian

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This has the issue, that, since the macro is called in parent_scope, `_my_marcros_file` is invisible to the place where the macro is defined. Thus the printed message will be ("This CMakeLists.txt file is in "). – NOhs Mar 13 '17 at 09:10
I added some clarification to the question. – NOhs Mar 13 '17 at 09:15
But it is the other way around. I want to use the macro defined in the child scope in parent scope. Which works, but I don't want to make the variables of the child scope visible to the parent scope. – NOhs Mar 13 '17 at 09:19
@MrZ Ok. I've just see your changed question. Modified my code to work in your scenario also by using a user defined global property. – Florian Mar 13 '17 at 09:21

score -1 · Answer 2 · answered Mar 13 '17 at 20:08

-1

Use CMAKE_SOURCE_DIR to get a path to outermost parent CMakeLists.txt.

answered Mar 13 '17 at 20:08

dragn

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How to define a cmake macro in a sub_directory that uses the CURRENT_SOURCE_DIR?

2 Answers2

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