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) or the one declared in cpp_info.name or in cpp_info.names["cmake"] 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_target_link_libraries()

Helper to link all libraries to a specified target.

These targets are:

A CONAN_PKG::<PKG-NAME> target per package in the dependency graph. This is an IMPORTED INTERFACE target. IMPORTED because it is external, a pre-compiled library. INTERFACE, because it doesn’t necessarily match a library, it could be a header-only library, or the package could even contain several libraries. It contains all the properties (include paths, compile flags, etc.) that are defined in the consumer. It contains all the properties (include paths, compile flags, etc.) that are defined in the package_info() method of the recipe.
Inside each package a CONAN_LIB::<PKG-NAME>_<LIB-NAME> target will be generated for each library. Its type is IMPORTED UNKNOWN and its main purpose is to provide a correct link order. Their only properties are the location and the dependencies.
A CONAN_PKG depends on every CONAN_LIB that belongs to it, and to its direct public dependencies (e.g. other CONAN_PKG targets from its requirements).
Each CONAN_LIB depends on the direct public dependencies CONAN_PKG targets of its container package. This guarantees correct link order.

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().

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().