[question] Is new cmake_layout compatible with cpp_info.components ?

Hi, I’ve been using CMakeToolchain for a while with the CMake build helper that comes with it. But after updating today I saw that CMake build helper does not accept a build_folder parameter anymore.

Looking at why it happened I arrived at https://github.com/conan-io/conan/pull/8554/files#diff-d72013a45b00a0adf06f4536d6a8c8844461e51b72911937d63e6dda9a3d440aR64 this means that the new way of providing the folder topology is via def layout(self) right?

My first move was to employ the new cmake_layout utility, but I was unable to create a package if this one used self.cpp_info.components

ERROR: 
	ConanException: say/0.1 package_info(): self.cpp_info.components cannot be used with self.cpp_info global values at the same time

Conanfile example:

from conans import ConanFile, CMake
from conan.tools.layout import cmake_layout, LayoutPackager

class Pkg(ConanFile):
    name = "say"
    version = "0.1"
    settings = "os", "compiler", "arch", "build_type"
    generators = "cmake"
    exports_sources = "src/*"

    def layout(self):
        cmake_layout(self)

    def build(self):
        cmake = CMake(self)
        cmake.configure()
        cmake.build()

    def package(self):
        LayoutPackager(self).package()

    def package_info(self):
        self.cpp_info.components["say"].libs = ["say"]

So, I am doing something wrong? Is this intended or just a bug/missing feature?

Thanks!

• I’ve read the CONTRIBUTING guide.

[memsharded]

Hi @Hopobcn

yes, please check the warning notes in https://docs.conan.io/en/latest/reference/conanfile/methods.html#layout.

It is extremely risky to try to introduce the layout() functionality changes in the old generators. Only the new ones will fully support this functionality (Note that internally we are replacing all the logic of the generators to work, from the self.dependencies, to new cpp_info structure definitions.)

[lasote]

on my way!