$ conan install [-h] [-g GENERATOR] [-if INSTALL_FOLDER] [-m [MANIFESTS]] [-mi [MANIFESTS_INTERACTIVE]] [-v [VERIFY]] [--no-imports] [-j JSON] [-b [BUILD]] [-e ENV] [-o OPTIONS] [-pr PROFILE] [-r REMOTE] [-s SETTINGS] [-u] path_or_reference
Installs the requirements specified in a recipe (conanfile.py or conanfile.txt). It can also be used to install a concrete package specifying a reference. If any requirement is not found in the local cache, it will retrieve the recipe from a remote, looking for it sequentially in the configured remotes. When the recipes have been downloaded it will try to download a binary package matching the specified settings, only from the remote from which the recipe was retrieved. If no binary package is found, it can be build from sources using the ‘–build’ option. When the package is installed, Conan will write the files for the specified generators.
positional arguments: path_or_reference Path to a folder containing a recipe (conanfile.py or conanfile.txt) or to a recipe file. E.g., ./my_project/conanfile.txt. It could also be a reference optional arguments: -h, --help show this help message and exit -g GENERATOR, --generator GENERATOR Generators to use -if INSTALL_FOLDER, --install-folder INSTALL_FOLDER Use this directory as the directory where to put the generatorfiles. E.g., conaninfo/conanbuildinfo.txt -m [MANIFESTS], --manifests [MANIFESTS] Install dependencies manifests in folder for later verify. Default folder is .conan_manifests, but can be changed -mi [MANIFESTS_INTERACTIVE], --manifests-interactive [MANIFESTS_INTERACTIVE] Install dependencies manifests in folder for later verify, asking user for confirmation. Default folder is .conan_manifests, but can be changed -v [VERIFY], --verify [VERIFY] Verify dependencies manifests against stored ones --no-imports Install specified packages but avoid running imports -j JSON, --json JSON Path to a json file where the install information will be written -b [BUILD], --build [BUILD] Optional, use it to choose if you want to build from sources: --build Build all from sources, do not use binary packages. --build=never Never build, use binary packages or fail if a binary package is not found. --build=missing Build from code if a binary package is not found. --build=outdated Build from code if the binary is not built with the current recipe or when missing binary package. --build=[pattern] Build always these packages from source, but never build the others. Allows multiple --build parameters. 'pattern' is a fnmatch file pattern of a package name. Default behavior: If you don't specify anything, it will be similar to '--build=never', but package recipes can override it with their 'build_policy' attribute in the conanfile.py. -e ENV, --env ENV Environment variables that will be set during the package build, -e CXX=/usr/bin/clang++ -o OPTIONS, --options OPTIONS Define options values, e.g., -o Pkg:with_qt=true -pr PROFILE, --profile PROFILE Apply the specified profile to the install command -r REMOTE, --remote REMOTE Look in the specified remote server -s SETTINGS, --settings SETTINGS Settings to build the package, overwriting the defaults. E.g., -s compiler=gcc -u, --update Check updates exist from upstream remotes
conan install executes methods of a conanfile.py in the following order:
Note this describes the process of installing a pre-built binary package. If the package has to be built, conan install --build executes the following:
Install a package requirement from a
conanfile.txt, saved in your current directory with one option and setting (other settings will be defaulted as defined in
$ conan install . -o PkgName:use_debug_mode=on -s compiler=clang
You have to take into account that settings are cached as defaults in the conaninfo.txt file, so you don’t have to type them again and again in the conan install or conan create commands.
However, the default options are defined in your conanfile. If you want to change the default options across all your conan install commands, change them in the conanfile. When you change the options on the command line, they are only changed for one shot. Next time, conan install will take the conanfile options as default values, if you don’t specify them again in the command line.
Install the OpenCV/2.4.10@lasote/testing reference with its default options and default settings from
$ conan install opencv/2.4.10@lasote/testing
Install the OpenCV/2.4.10@lasote/testing reference updating the recipe and the binary package if new upstream versions are available:
$ conan install opencv/2.4.10@lasote/testing --update
Both the conan install and create commands have options to specify whether conan should try to build things or not:
- --build=never: This is the default option. It is not necessary to write it explicitly. Conan will not try to build packages when the requested configuration does not match, in which case it will throw an error.
- --build=missing: Conan will try to build from source, all packages of which the requested configuration was not found on any of the active remotes.
- --build=outdated: Conan will try to build from code if the binary is not built with the current recipe or when missing binary package.
- --build=[pattern]: A fnmatch file pattern of a package name. E.g.,
zlibpackage. Conan will force the build of the packages, the name of which matches the given pattern. Several patterns can be specified, chaining multiple options, e.g., --build=pattern1 --build=pattern2.
- --build: Always build everything from source. Produces a clean re-build of all packages and transitively dependent packages
With the -e parameters you can define:
- Global environment variables (-e SOME_VAR="SOME_VALUE"). These variables will be defined before the build step in all the packages and will be cleaned after the build execution.
- Specific package environment variables (-e zlib:SOME_VAR="SOME_VALUE"). These variables will be defined only in the specified packages (e.g., zlib).
You can specify this variables not only for your direct
requires but for any package in the
If you want to define an environment variable but you want to append the variables declared in your requirements you can use the  syntax:
$ conan install . -e PYTHONPATH=[/other/path]
This way the first entry in the PYTHONPATH variable will be /other/path but the PYTHONPATH values declared in the requirements of the project will be appended at the end using the system path separator.
With the -s parameters you can define:
- Global settings (-s compiler="Visual Studio"). Will apply to all the requires.
- Specific package settings (-s zlib:compiler="MinGW"). Those settings will be applied only to the specified packages.
You can specify custom settings not only for your direct
requires but for any package in the
With the -o parameters you can only define specific package options.
$ conan install . -o zlib:shared=True $ conan install . -o zlib:shared=True -o bzip2:option=132 # you can also apply the same options to many packages with wildcards: $ conan install . -o *:shared=True
You can use profiles files to create predefined sets of settings, options and environment variables.