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. XXX is the name of the require in uppercase. e.g. “ZLIB” for zlib/1.2.8@lasote/stable requirement:

NAME	VALUE
CONAN_XXX_ROOT	Abs path to root package folder.
CONAN_INCLUDE_DIRS_XXX	Header’s folders
CONAN_LIB_DIRS_XXX	Library folders (default {CONAN_XXX_ROOT}/lib)
CONAN_BIN_DIRS_XXX	Binary folders (default {CONAN_XXX_ROOT}/bin)
CONAN_SRC_DIRS_XXX	Sources folders
CONAN_LIBS_XXX	Library names to link
CONAN_DEFINES_XXX	Library defines
CONAN_COMPILE_DEFINITIONS_XXX	Compile definitions
CONAN_CXX_FLAGS_XXX	CXX flags
CONAN_SHARED_LINK_FLAGS_XXX	Shared link flags
CONAN_C_FLAGS_XXX	C flags

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
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

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_XXXX_YYYY

User declared value

Where XXXX means the name of the requirement in uppercase and YYYY 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 output directories. Deactivates the call to the macro 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::PkgName 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 package_info() method of the recipe.
Inside each package a CONAN_LIB::PkgName_LibName 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 the bin/ and lib/ output directories.

conan_set_find_library_paths()

Sets CMAKE_INCLUDE_PATH and CMAKE_INCLUDE_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.

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().