obs-studio/cmake/Modules/FindLibrnnoise.cmake

# Once done these will be defined:
#
# LIBRNNOISE_FOUND LIBRNNOISE_INCLUDE_DIRS LIBRNNOISE_LIBRARIES
#
# For use in OBS:
#
# RNNOISE_INCLUDE_DIR

find_package(PkgConfig QUIET)
if(PKG_CONFIG_FOUND)
  pkg_check_modules(_RNNOISE QUIET rnnoise)
endif()

if(CMAKE_SIZEOF_VOID_P EQUAL 8)
  set(_lib_suffix 64)
else()
  set(_lib_suffix 32)
endif()

find_path(
  RNNOISE_INCLUDE_DIR
  NAMES rnnoise.h
  HINTS ENV RNNOISE_PATH ${RNNOISE_PATH} ${CMAKE_SOURCE_DIR}/${RNNOISE_PATH}
        ${_RNNOISE_INCLUDE_DIRS}
  PATHS /usr/include /usr/local/include /opt/local/include /sw/include
  PATH_SUFFIXES include)

find_library(
  RNNOISE_LIB
  NAMES ${_RNNOISE_LIBRARIES} rnnoise
  HINTS ENV RNNOISE_PATH ${RNNOISE_PATH} ${CMAKE_SOURCE_DIR}/${RNNOISE_PATH}
        ${_RNNOISE_LIBRARY_DIRS}
  PATHS /usr/lib /usr/local/lib /opt/local/lib /sw/lib
  PATH_SUFFIXES
    lib${_lib_suffix}
    lib
    libs${_lib_suffix}
    libs
    bin${_lib_suffix}
    bin
    ../lib${_lib_suffix}
    ../lib
    ../libs${_lib_suffix}
    ../libs
    ../bin${_lib_suffix}
    ../bin)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Librnnoise DEFAULT_MSG RNNOISE_LIB
                                  RNNOISE_INCLUDE_DIR)
mark_as_advanced(RNNOISE_INCLUDE_DIR RNNOISE_LIB)

if(LIBRNNOISE_FOUND)
  set(LIBRNNOISE_INCLUDE_DIRS ${RNNOISE_INCLUDE_DIR})
  set(LIBRNNOISE_LIBRARIES ${RNNOISE_LIB})

  if(NOT TARGET Librnnoise::Librnnoise)
    if(IS_ABSOLUTE "${LIBRNNOISE_LIBRARIES}")
      add_library(Librnnoise::Librnnoise UNKNOWN IMPORTED)
      set_target_properties(
        Librnnoise::Librnnoise PROPERTIES IMPORTED_LOCATION
                                          "${LIBRNNOISE_LIBRARIES}")
    else()
      add_library(Librnnoise::Librnnoise INTERFACE IMPORTED)
      set_target_properties(
        Librnnoise::Librnnoise PROPERTIES IMPORTED_LIBNAME
                                          "${LIBRNNOISE_LIBRARIES}")
    endif()

    set_target_properties(
      Librnnoise::Librnnoise PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
                                        "${LIBRNNOISE_INCLUDE_DIRS}")
  endif()
endif()