Cannot use libiio as a cmake subproject

[myzinsky]

Just consider this minimal CMakeLists.txt:

cmake_minimum_required(VERSION 3.10)
include(FetchContent)
project(qluto4)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

message(STATUS "Fetching libiio from github")
FetchContent_Declare(
    libiio
    GIT_REPOSITORY https://github.com/analogdevicesinc/libiio
    GIT_TAG main
)

include_directories(build/_deps/libiio-build)

FetchContent_MakeAvailable(libiio)

When I want to build this project, it fails with the following error:

...
[ 30%] Built target iio
[ 31%] Building C object _deps/libiio-build/CMakeFiles/iio-compat.dir/compat.c.o
[ 32%] Building C object _deps/libiio-build/CMakeFiles/iio-compat.dir/dynamic-unix.c.o
[ 34%] Linking C shared library iio.framework/iio
Fixup Current symbolic link
/bin/sh: line 0: cd: /Users/myzinsky/Programming/qluto4/build/iio.framework/Versions: No such file or directory
make[2]: *** [_deps/libiio-build/iio.framework/Versions/0.99/iio] Error 1
make[2]: *** Deleting file `_deps/libiio-build/iio.framework/Versions/0.99/iio'
make[1]: *** [_deps/libiio-build/CMakeFiles/iio-compat.dir/all] Error 2
make: *** [all] Error 2

So it seems that cmake places the generated framework iio.framework not where it actually expects it. I can find the file at:

build/_deps/libiio-build/iio.framewok

Seems that libiio uses CMAKE_BINARY_DIR variable when create the version file: CMakeLists.txt:374. Most likely, the project expects given directory to refer to the project's binary directory. So that makes it impossible to build up proper projects using FetchContent. Would there be a quick solution to support this?

[rgetz]

I think this is Darwin specific - Maybe @tfcollins can have a look?

[tfcollins]

This seems to have been solved here https://github.com/analogdevicesinc/libad9361-iio/issues/130

[rgetz]

@myzinsky does the other issue solve this one (I'm not sure - they looked seperate to me).

-Robin

[myzinsky]

Somehow magically yes. However, I would prefer to use FetchContent_Declare instead of ExternalProject_Add, as for many other projects.