cmake/Modules/FindALSA.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#.rst:
# FindALSA
# --------
#
# Find alsa
#
# Find the alsa libraries (asound)
#
# IMPORTED Targets
# ^^^^^^^^^^^^^^^^
#
# This module defines :prop_tgt:`IMPORTED` target ``ALSA::ALSA``, if
# ALSA has been found.
#
# Result Variables
# ^^^^^^^^^^^^^^^^
#
# This module defines the following variables:
#
# ``ALSA_FOUND``
#   True if ALSA_INCLUDE_DIR & ALSA_LIBRARY are found
#
# ``ALSA_LIBRARIES``
#   List of libraries when using ALSA.
#
# ``ALSA_INCLUDE_DIRS``
#   Where to find the ALSA headers.
#
# 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

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(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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)