Conan 1.51: Improved download tool to support getting files from the local file system, support for components in MSBuildDeps, improved CMakePresets integration, new MesonDeps generator and lots of fixes to ease Conan 2.0 migration.
We are pleased to announce that Conan 1.51 is
out and comes with some
significant new features and bug fixes. For example, we added support in
to get files from the local file system. Also, now the
generator has support for components. We have made some improvements to the
support. We added a new
generator. Finally, we continue to work on the transition to Conan 2.0. This release
brings several fixes to make the migration easier.
Support for files in the local file system in conan.tools.files.download
Starting in Conan 1.51, the
tool can reference files from the local file system. That means that
will also work with local files. To use it in your recipes, reference the file you want to
get or download using the
file:///<location> syntax like this:
from conan import ConanFile from conan.tools.files import get class MylibConan(ConanFile): ... def source(self): get(self, "file:///path_to_folder/source.zip") # or if you want to use download... download(self, "file:///path_to_folder/main.cpp")
To learn more about these tools, please check the Conan documentation.
Components support in MSBuildDeps
This release brings component support for the
generator. Now, for Conan packages that use components, this generator will create
separate property files for each component. That means that you can customize those
property files to just include what you need. For example, if you are depending directly
on a package that has components such as boost but you
just want to use the boost filesystem and chrono components, you can easily
customize the property file in the
generate() method. Let’s see an example:
import textwrap from conan import ConanFile from conan.tools.microsoft import MSBuildDeps from conan.tools.files import save class MyappConan(ConanFile): name = "myapp" version = "1.0" ... def generate(self): deps = MSBuildDeps(self) deps.generate() # overwrite the generated conan_boost.props # with just the components # we want to use instead of all of them component_deps = textwrap.dedent(r""" <?xml version="1.0" ?> <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0"> <ImportGroup Label="PropertySheets"> <Import Condition="'$(conan_boost_chrono_props_imported)' != 'True'" Project="conan_boost_chrono.props"/> <Import Condition="'$(conan_boost_filesystem_props_imported)' != 'True'" Project="conan_boost_filesystem.props"/> </ImportGroup> <PropertyGroup> <conan_boost_props_imported>True</conan_boost_props_imported> </PropertyGroup> </Project> """) save(self, "conan_boost.props", component_deps)
Improvements in CMakePresets integration
We continue to improve the CMakePresets support in Conan. This release adds a couple of features:
architectureitems when using Ninja generator and the msvc compiler. This will make that Visual Studio can set the correct compiler automatically
There is a new conf item named tools.cmake.cmaketoolchain.presets:max_schema_version to define which schema version is used for the files CMakePresets.json and CMakeUserPresets.json. By default, the version schema of the generated CMakeUserPresets.json is 4 and the schema for the CMakePresets.json is 3, so be aware that they require CMake >= 3.23.
Read more about the CMakePresets integration in the Conan documentation.
New MesonDeps generator
In most cases, when creating packages that use Meson as the build system, you use the
along with the
generator and then Meson will find the requirements using pkg-config. There are some
cases, like the example below, where the build script uses the
project('mesonpackage', 'cpp') cxx = meson.get_compiler('cpp') mylib = cxx.find_library('mylib', required: true) executable('app', 'main.cpp', dependencies: mylib)
In this case, Meson won’t use already known detection mechanisms like pkg-config, cmake or config-tool and you must inject the correct flags to the compiler to find those libraries. This is the use case of MesonDeps that will define the appropiate args and link_args variables to link with those libraries.
Ease Conan 2.0 migration
The migration process to Conan 2.0 compatible recipes has started in Conan Center Index and the Conan team is making a great effort to help in the migration process to Conan 2.0 compatible recipes. With that in mind, we have released several patch Conan versions up to Conan 1.51.3 and backported a few fixes to Conan 1.50.2 which is the Conan version used in Conan Center Index by this date. If you want to get ready for Conan 2.0, please do not forget to check the Conan migration guide to 2.0 in the Conan documentation.
Besides the items listed above, there were some minor bug fixes you may wish to read about. If so please refer to the changelog for the complete list.
We hope you enjoy this release and look forward to your feedback.