How to use conan-2 to package an existing library( ITK )

[986247404]

What is your question?

Hi！
I want to package the compiled ITK library. The conan command is " conan export-pkg . -s build_type=Release". But I can't use this recipe in a cmake project through find_package(). What should i do ? Looking forward to your reply.
My conanfile.py like this:

from conan import ConanFile
from conan.tools.files import copy, collect_libs
import os

class ITKConan(ConanFile):
name = "itk"
version = "5.1.0"
settings = "os", "compiler", "build_type", "arch"
package_type = "shared-library"

def layout(self):
    self.folders.build = "."
    self.folders.source = self.folders.build
    self.cpp.source.includedirs = ["include"]
    self.cpp.build.libdirs = ["lib"]
    self.cpp.build.bindirs = ["bin"]

def package(self):
    local_include_folder = os.path.join(self.source_folder, self.cpp.source.includedirs[0])
    local_lib_folder = os.path.join(self.build_folder, self.cpp.build.libdirs[0])
    local_bin_folder = os.path.join(self.build_folder, self.cpp.build.bindirs[0])
    copy(self, "*", local_include_folder, os.path.join(self.package_folder, "include")
         , keep_path=True)
    copy(self, "*", src=local_lib_folder,
         dst=os.path.join(self.package_folder, "lib"), keep_path=True)
    copy(self, "*", src=local_bin_folder,
         dst=os.path.join(self.package_folder, "bin"), keep_path=True)

def package_info(self):
    self.cpp_info.libs = collect_libs(self, folder=os.path.join(
        self.package_folder, "lib"))

Have you read the CONTRIBUTING guide?

• I've read the CONTRIBUTING guide

[memsharded]

Hi @986247404

Thanks for your question.

I think it is very likely that you are missing a lot of information in the package_info() method.
You can also use the in-package xxx-config.cmake files if you prefer (and only using CMake in the consumers), see https://docs.conan.io/2/examples/tools/cmake/cmake_toolchain/use_package_config_cmake.html

Otherwise, it is possible that it is necessary to specify in the package_info() the includedirs, libdirs, etc. It is also possible that the collect_libs is not finding all libraries either.

And finally it is also very important the consumer code, using CMakeToolchain, CMakeDeps, and calling cmake ... correctly with the generated files. It would help to get the full details of the consumer, the exact commands you are using both to create the package and to consume it, and the full output of the commands. Thanks for the feedback.

[986247404]

Hi @986247404

Thanks for your question.

I think it is very likely that you are missing a lot of information in the package_info() method. You can also use the in-package xxx-config.cmake files if you prefer (and only using CMake in the consumers), see https://docs.conan.io/2/examples/tools/cmake/cmake_toolchain/use_package_config_cmake.html

Otherwise, it is possible that it is necessary to specify in the package_info() the includedirs, libdirs, etc. It is also possible that the collect_libs is not finding all libraries either.

And finally it is also very important the consumer code, using CMakeToolchain, CMakeDeps, and calling cmake ... correctly with the generated files. It would help to get the full details of the consumer, the exact commands you are using both to create the package and to consume it, and the full output of the commands. Thanks for the feedback.

Many thanks for your replying. If a library don't have xxx-config.cmake files and , what should i do to package a conan recipe and used in cmake project. Are xxx-config.cmake files "nice to have" or strictly required?

[memsharded]

The xxx-config.cmake file is necessary if you are using that package from a CMake project. This file can be:

• Generated automatically by the CMakeDeps Conan generator. For this to work correctly, you need to fill correctly the package_info() method, as the information is derived from there.
• Or contained inside the package, as a result of the cmake build + cmake install process, as described in https://docs.conan.io/2/examples/tools/cmake/cmake_toolchain/use_package_config_cmake.html

[valgur]

Is there anything missing from the ConanCenter version of ITK (https://conan.io/center/recipes/itk)? I'm not trying to imply that you should use it necessarily, just curious.

[986247404]

The xxx-config.cmake file is necessary if you are using that package from a CMake project. This file can be:

• Generated automatically by the CMakeDeps Conan generator. For this to work correctly, you need to fill correctly the package_info() method, as the information is derived from there.
• Or contained inside the package, as a result of the cmake build + cmake install process, as described in https://docs.conan.io/2/examples/tools/cmake/cmake_toolchain/use_package_config_cmake.html

Thanks a lot.

[986247404]

Is there anything missing from the ConanCenter version of ITK (https://conan.io/center/recipes/itk)? I'm not trying to imply that you should use it necessarily, just curious.

Because i have to use Module_ITKDCMTK and Module_IODCMTK modules in ITK.

[valgur]

Ok, in that case you might want to give the updated recipe in conan-io/conan-center-index#21651 a try, which adds DCMTK support. It's also available at https://github.com/valgur/conan-center-index?tab=readme-ov-file#setup.