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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindALSA
--------
Finds the Advanced Linux Sound Architecture (ALSA) library (``asound``).
Imported Targets
^^^^^^^^^^^^^^^^
This module provides the following :ref:`Imported Targets`:
``ALSA::ALSA``
.. versionadded:: 3.12
Target encapsulating the ALSA library usage requirements. This target is
available only if ALSA is found.
Result Variables
^^^^^^^^^^^^^^^^
This module defines the following variables:
``ALSA_FOUND``
Boolean indicating whether the ALSA library is found.
``ALSA_LIBRARIES``
List of libraries needed for linking to use ALSA library.
``ALSA_INCLUDE_DIRS``
Include directories containing headers needed to use ALSA library.
Cache Variables
^^^^^^^^^^^^^^^
The following cache variables may also be set:
``ALSA_INCLUDE_DIR``
The ALSA include directory.
``ALSA_LIBRARY``
The absolute path of the asound library.
Examples
^^^^^^^^
Finding the ALSA library and linking it to a project target:
.. code-block:: cmake
find_package(ALSA)
target_link_libraries(project_target PRIVATE ALSA::ALSA)
#]=======================================================================]
cmake_policy(PUSH)
cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
find_path(ALSA_INCLUDE_DIR NAMES alsa/asoundlib.h
DOC "The ALSA (asound) include directory"
)
find_library(ALSA_LIBRARY NAMES asound
DOC "The ALSA (asound) library"
)
if(ALSA_INCLUDE_DIR AND EXISTS "${ALSA_INCLUDE_DIR}/alsa/version.h")
file(STRINGS "${ALSA_INCLUDE_DIR}/alsa/version.h" alsa_version_str REGEX "^#define[\t ]+SND_LIB_VERSION_STR[\t ]+\".*\"")
string(REGEX REPLACE "^.*SND_LIB_VERSION_STR[\t ]+\"([^\"]*)\".*$" "\\1" ALSA_VERSION_STRING "${alsa_version_str}")
unset(alsa_version_str)
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(ALSA
REQUIRED_VARS ALSA_LIBRARY ALSA_INCLUDE_DIR
VERSION_VAR ALSA_VERSION_STRING)
if(ALSA_FOUND)
set( ALSA_LIBRARIES ${ALSA_LIBRARY} )
set( ALSA_INCLUDE_DIRS ${ALSA_INCLUDE_DIR} )
if(NOT TARGET ALSA::ALSA)
add_library(ALSA::ALSA UNKNOWN IMPORTED)
set_target_properties(ALSA::ALSA PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${ALSA_INCLUDE_DIRS}")
set_property(TARGET ALSA::ALSA APPEND PROPERTY IMPORTED_LOCATION "${ALSA_LIBRARY}")
endif()
endif()
mark_as_advanced(ALSA_INCLUDE_DIR ALSA_LIBRARY)
cmake_policy(POP)
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