cmake

This is the reference page for cmake generator. Go to Integrations/CMake if you want to learn how to integrate your project or recipes with CMake.

It generates a file named conanbuildinfo.cmake and declares some variables and methods.

Variables in conanbuildinfo.cmake

  • Package declared variables:

    For each requirement conanbuildinfo.cmake file declares the following variables. Where <PKG-NAME> is the placeholder for the name of the require in uppercase (ZLIB for zlib/1.2.8@lasote/stable) in cpp_info.names["cmake_find_package"] or cpp_info.names["cmake_find_package_multi"] if specified:

    NAME

    VALUE

    CONAN_<PKG-NAME>_ROOT

    Abs path to root package folder.

    CONAN_INCLUDE_DIRS_<PKG-NAME>

    Header’s folders

    CONAN_LIB_DIRS_<PKG-NAME>

    Library folders (default {CONAN_<PKG-NAME>_ROOT}/lib)

    CONAN_BIN_DIRS_<PKG-NAME>

    Binary folders (default {CONAN_<PKG-NAME>_ROOT}/bin)

    CONAN_SRC_DIRS_<PKG-NAME>

    Sources folders

    CONAN_LIBS_<PKG-NAME>

    Library names to link (package libs, system libs and frameworks)

    CONAN_PKG_LIBS_<PKG-NAME>

    Package library names to link

    CONAN_SYSTEM_LIBS_<PKG-NAME>

    System library names to link

    CONAN_DEFINES_<PKG-NAME>

    Library defines

    CONAN_COMPILE_DEFINITIONS_<PKG-NAME>

    Compile definitions

    CONAN_CXX_FLAGS_<PKG-NAME>

    CXX flags

    CONAN_SHARED_LINK_FLAGS_<PKG-NAME>

    Shared link flags

    CONAN_C_FLAGS_<PKG-NAME>

    C flags

    CONAN_FRAMEWORKS_<PKG-NAME>

    Frameworks names to use them in find_library()

    CONAN_FRAMEWORKS_FOUND_<PKG-NAME>

    Frameworks found after using CONAN_FRAMEWORKS in find_library()

    CONAN_FRAMEWORK_PATHS_<PKG-NAME>

    Framework folders to locate the frameworks (OSX)

  • Global declared variables:

    This generator also declares some global variables with the aggregated values of all our requirements. The values are ordered in the right order according to the dependency tree.

    NAME

    VALUE

    CONAN_INCLUDE_DIRS

    Aggregated header’s folders

    CONAN_LIB_DIRS

    Aggregated library folders

    CONAN_BIN_DIRS

    Aggregated binary folders

    CONAN_SRC_DIRS

    Aggregated sources folders

    CONAN_LIBS

    Aggregated library names to link (with system libs and frameworks)

    CONAN_SYSTEM_LIBS

    Aggregated system libraries names to link

    CONAN_DEFINES

    Aggregated library defines

    CONAN_COMPILE_DEFINITIONS

    Aggregated compile definitions

    CONAN_CXX_FLAGS

    Aggregated CXX flags

    CONAN_SHARED_LINK_FLAGS

    Aggregated Shared link flags

    CONAN_C_FLAGS

    Aggregated C flags

    CONAN_FRAMEWORKS

    Aggregated frameworks to be found with find_library() (OSX)

    CONAN_FRAMEWORKS_FOUND

    Aggregated found frameworks after find_library() call (OSX)

    CONAN_FRAMEWORK_PATHS

    Aggregated framework folders (OSX)

    CONAN_BUILD_MODULES

    Aggregated paths for build module files (like .cmake)

  • User information declared variables:

    If any of the requirements is filling the user_info object in the package_info method a set of variables will be declared following this naming:

    NAME

    VALUE

    CONAN_USER_<PKG-NAME>_<VAR-NAME>

    User declared value

    Where <PKG-NAME> means the name of the requirement in uppercase and <VAR-NAME> the variable name. For example, if this recipe declares:

    class MyLibConan(ConanFile):
        name = "mylib"
        version = "1.6.0"
    
        # ...
    
        def package_info(self):
            self.user_info.var1 = 2
    

    Other library requiring mylib and using this generator will get:

    conanbuildinfo.cmake
     # ...
     set(CONAN_USER_MYLIB_var1 "2")
    

Macros available in conanbuildinfo.cmake

conan_basic_setup()

This is a helper and general purpose macro that uses all the macros below to set all the CMake variables according to the Conan generated variables. See the macros below for detailed information.

macro(conan_basic_setup)
    set(options TARGETS NO_OUTPUT_DIRS SKIP_RPATH KEEP_RPATHS SKIP_STD SKIP_FPIC)
Parameters:
  • TARGETS (Optional): Setup all the CMake variables by target (only CMake > 3.1.2). Activates the call to the macro conan_target_link_libraries().

  • NO_OUTPUT_DIRS (Optional): Do not adjust the build output directories. Deactivates the call to the macro [conan_output_dirs_setup()](#conan_output_dirs_setup).

  • SKIP_RPATH (Optional): [DEPRECATED] Use KEEP_RPATHS instead. Activate CMAKE_SKIP_RPATH variable in OSX.

  • KEEP_RPATHS (Optional): Do not adjust the CMAKE_SKIP_RPATH variable in OSX. Activates the call to the macro conan_set_rpath()

  • SKIP_STD (Optional): Do not adjust the C++ standard flag in CMAKE_CXX_FLAGS. Deactivates the call to the macro conan_set_std().

  • SKIP_FPIC (Optional): Do not adjust the CMAKE_POSITION_INDEPENDENT_CODE flag. Deactivates the call to the macro conan_set_fpic().

Note

You can also call each of the following macros individually instead of using the conan_basic_setup().

conan_check_compiler()

Checks that your compiler matches the one declared in settings.

This method can be disabled setting the CONAN_DISABLE_CHECK_COMPILER variable.

conan_output_dirs_setup()

Adjusts each CMAKE_RUNTIME_OUTPUT_DIRECTORY variable to be ${CMAKE_CURRENT_BINARY_DIR}/bin and each CMAKE_ARCHIVE_OUTPUT_DIRECTORY and CMAKE_LIBRARY_OUTPUT_DIRECTORY variable to be ${CMAKE_CURRENT_BINARY_DIR}/lib.

Calling this method makes writing the package() method for recipies easier. All artifacts will always be found in the same location. Otherwise, they may be found in different locations depending on your build environment (eg Linux vs Windows).

conan_set_find_library_paths()

Sets CMAKE_INCLUDE_PATH and CMAKE_LIBRARY_PATH.

conan_global_flags()

Sets the corresponding variables to CMake’s include_directories() and link_directories(). You can enable the variable CONAN_SYSTEM_INCLUDES in order to get directories included with the SYSTEM option.

conan_define_targets()

Defines the targets for each dependency (target flags instead of global flags).

conan_set_rpath()

Sets CMAKE_SKIP_RPATH=1 in the case of working in OSX.

conan_set_vs_runtime()

Adjusts the runtime flags /MD, /MDd, /MT or /MTd for Visual Studio.

conan_set_std()

Sets CMAKE_CXX_STANDARD and CMAKE_CXX_EXTENSIONS to the appropriate values.

conan_set_libcxx()

Adjusts the standard library flags (libc++`, libstdc++, libstdc++11) in CMAKE_CXX_FLAGS.

conan_set_find_paths()

Adjusts CMAKE_MODULE_PATH and CMAKE_PREFIX_PATH to the values of deps_cpp_info.build_paths.

conan_include_build_modules()

Includes CMake files declared in CONAN_BUILD_MODULES using the include(...) directive. This loads the functions or macros that packages may export and makes them available for usage in the consumers CMakeLists.txt.

conan_find_apple_frameworks(FRAMEWORKS_FOUND FRAMEWORKS)

Find framework library names provided in ${FRAMEWORKS} using find_library() and return the found values in FRAMEWORKS_FOUND.

Input variables for conanbuildinfo.cmake

CONAN_CMAKE_SILENT_OUTPUT

Default to: FALSE

Activate it to silence the Conan message output.

CONAN_DISABLE_CHECK_COMPILER

Default to: FALSE

Deactivates the check of the compiler done with the method conan_check_compiler().