Helper macros for find modules:
Prints warnings if the CMake version or the project’s required CMake version is older than that required by extra-cmake-modules.
ecm_find_package_parse_components(<name> RESULT_VAR <variable> KNOWN_COMPONENTS <component1> [<component2> [...]] [SKIP_DEPENDENCY_HANDLING])
This macro will populate <variable> with a list of components found in
<name>_FIND_COMPONENTS, after checking that all those components are in the
KNOWN_COMPONENTS; if there are any unknown components, it will print
an error or warning (depending on the value of <name>_FIND_REQUIRED) and call
The order of components in <variable> is guaranteed to match the order they
are listed in the
SKIP_DEPENDENCY_HANDLING is not set, for each component the variable
<name>_<component>_component_deps will be checked for dependent components.
If <component> is listed in <name>_FIND_COMPONENTS, then all its (transitive)
dependencies will also be added to <variable>.
ecm_find_package_handle_library_components(<name> COMPONENTS <component> [<component> [...]] [SKIP_DEPENDENCY_HANDLING]) [SKIP_PKG_CONFIG])
Creates an imported library target for each component. The operation of this macro depends on the presence of a number of CMake variables.
The <name>_<component>_lib variable should contain the name of this library,
and <name>_<component>_header variable should contain the name of a header
file associated with it (whatever relative path is normally passed to
‘#include’). <name>_<component>_header_subdir variable can be used to specify
which subdirectory of the include path the headers will be found in.
ecm_find_package_components() will then search for the library
and include directory (creating appropriate cache variables) and create an
imported library target named <name>::<component>.
Additional variables can be used to provide additional information:
SKIP_PKG_CONFIG, the <name>_<component>_pkg_config variable is set, and
pkg-config is found, the pkg-config module given by
<name>_<component>_pkg_config will be searched for and used to help locate the
library and header file. It will also be used to set
Note that if version information is found via pkg-config, <name>_<component>_FIND_VERSION can be set to require a particular version for each component.
SKIP_DEPENDENCY_HANDLING is not set, the
of the imported target for <component> will be set to contain the imported
targets for the components listed in <name>_<component>_component_deps.
<component>_FOUND will also be set to
FALSE if any of the components in
<name>_<component>_component_deps are not found. This requires the components
in <name>_<component>_component_deps to be listed before <component> in the
The following variables will be set:
the imported targets
the found libraries
the combined required include directories for the components
the “other” CFLAGS provided by pkg-config, if any
the value of
<name>_<component>_VERSIONfor the first component that has this variable set (note that components are searched for in the order they are passed to the macro), although if it is already set, it will not be altered
These variables are never cleared, so if
ecm_find_package_handle_library_components() is called multiple times with
different components (typically because of multiple
find_package() calls) then
<name>_TARGETS, for example, will contain all the targets found in any
call (although no duplicates).