Styjun

I want to link a framework, that I made myself called VideoCapturer, to another project through its VideoCapturerConfig.cmake.
But I can't get the "usage requirement" / "target_link_libraries" correctly.

When I give the full path, hardcoded, to the location of the install framework, it works!

target_link_libraries( myprojectA
 PUBLIC -framework /install/path/to/videocapturer.framework )

I would rather do that with a target provided by find_package() for more robustness.

Here is the piece of CMake I wrote to build and install the framework

# MyVideoCapturer framework
project( MyVideoCapturer )

### General variables
set( myvideocapturer_targets_export_name "$CMAKE_PROJECT_NAMETargets" )
set( myvideocapturer_config_install_dir "$CMAKE_INSTALL_LIBDIR/cmake/$CMAKE_PROJECT_NAME" )
set( myvideocapturer_project_config "$CMAKE_PROJECT_NAMEConfig.cmake" )
set( myvideocapturer_version_config "$CMAKE_PROJECT_NAMEConfigVersion.cmake" )

add_library( VideoCapturer "" )
add_library( MyVideoCapturer::VideoCapturer ALIAS VideoCapturer )

add_subdirectory( src ) # Mostly target_sources( VideoCapturer PRIVATE someSrcFiles.cpp )
list( APPEND _pubheaders "macVideoCapturer/VideoCapturer.h" )
set_target_properties( VideoCapturer PROPERTIES
 FRAMEWORK TRUE
 PUBLIC_HEADER "$_pubheaders"
 XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "iPhone Developer"
 )

### Install targets, headers and export
include( GNUInstallDirs )
install(
 TARGETS VideoCapturer
 EXPORT "$myvideocapturer_targets_export_name"
 FRAMEWORK DESTINATION $CMAKE_INSTALL_LIBDIR
 PUBLIC_HEADER DESTINATION $CMAKE_INSTALL_INCLUDEDIR
 )

install(
 EXPORT "$myvideocapturer_targets_export_name"
 DESTINATION "$myvideocapturer_config_install_dir"
 NAMESPACE MyVideoCapturer::
 FILE $myvideocapturer_targets_export_name.cmake
 )

### Config file for Packaging
include( CMakePackageConfigHelpers )
configure_package_config_file(
 "Config.cmake.in"
 "$myvideocapturer_project_config"
 INSTALL_DESTINATION $myvideocapturer_config_install_dir
 PATH_VARS
 myvideocapturer_config_install_dir
 NO_SET_AND_CHECK_MACRO
 NO_CHECK_REQUIRED_COMPONENTS_MACRO
 )

in my Config.cmake.in

@PACKAGE_INIT@
include( "$CMAKE_CURRENT_LIST_DIR/@myvideocapturer_targets_export_name@.cmake" )

After installation of that framework :
in MyVideoCapturerTargets.cmake :

# Create imported target CppMacVideoCapturer::VideoCapturer
add_library(CppMacVideoCapturer::VideoCapturer SHARED IMPORTED)
set_property(TARGET CppMacVideoCapturer::VideoCapturer PROPERTY FRAMEWORK 1)

to my understanding, 2 lines should be enough to get it right :

find_package( myvideocapturer REQUIRED )
target_link_libraries( myprojectA
 PUBLIC -framework videocapturer )

when I try that, the project can't find the headers located in Videocapturer.framework/Headers
and if I try :

target_link_libraries( myprojectA
 PUBLIC -framework MyVideoCapturer::myvideocapturer )

CMake doesn't find the target.

Any idea how can I export my framework ?

Thanks a lot

EDIT

Thanks to tsyvarev I found a way to solve it. I am not sure if this is the "proper" way to do it though.

In the base project :

if( APPLE )
 target_include_directories( VideoCapturer
 PUBLIC $<INSTALL_INTERFACE:$CMAKE_INSTALL_LIBDIR/VideoCapturer.framework>
 )
else() # Framework is Apple-only
 target_include_directories( VideoCapturer
 PUBLIC $<INSTALL_INTERFACE:$CMAKE_INSTALL_INCLUDEDIR>
 )
endif()

EDIT 1/4/19 : the right way seems to do :

 target_include_directories( VideoCapturer
 PUBLIC $<INSTALL_INTERFACE:$CMAKE_INSTALL_LIBDIR/VideoCapturer.framework>
 )

last edit : Please read my own answer

The right way to install / export or package a framework is something like this : https://github.com/forexample/ios-dynamic-framework

However, it does contain a workaround, there is no find_package

This repository has a lot of good examples for "modern" CMake. check it out!