cmake_minimum_required(VERSION 3.1)
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

include(OpusFunctions)

get_library_version(OPUS_LIBRARY_VERSION OPUS_LIBRARY_VERSION_MAJOR)
message(STATUS "Opus library version: ${OPUS_LIBRARY_VERSION}")

get_package_version(PACKAGE_VERSION)
message(STATUS "Opus package version: ${PACKAGE_VERSION}")

string(REGEX
       REPLACE "^([0-9]+.[0-9]+\\.?([0-9]+)?).*"
               "\\1"
               PROJECT_VERSION
               ${PACKAGE_VERSION})
message(STATUS "Opus project version: ${PROJECT_VERSION}")

project(Opus LANGUAGES C VERSION ${PROJECT_VERSION})
include(OpusBuildtype)

option(OPUS_BUILD_SHARED_LIBRARY "Build shared library" OFF)
option(OPUS_STACK_PROTECTOR "Use stack protection" ON)
option(OPUS_CUSTOM_MODES "Enable non-Opus modes, e.g. 44.1 kHz & 2^n frames"
       OFF)
option(OPUS_BUILD_PROGRAMS "Build programs" OFF)
option(OPUS_BUILD_TESTING "Build tests" OFF)
option(OPUS_FIXED_POINT
       "Compile as fixed-point (for machines without a fast enough FPU)" OFF)
option(OPUS_ENABLE_FLOAT_API
       "Compile with the floating point API (for machines with float library"
       ON)
option(OPUS_FLOAT_APPROX
       "Enable floating point approximations (Ensure your platform supports IEEE 754 before enabling)"
       OFF)
option(OPUS_INSTALL_PKG_CONFIG_MODULE "Install PkgConfig module" ON)
option(OPUS_INSTALL_CMAKE_CONFIG_MODULE "Install CMake package config module"
       ON)

if(APPLE)
  option(OPUS_BUILD_FRAMEWORK "Build Framework bundle for Apple systems" OFF)
endif()

include(OpusConfig)
include(OpusSources)
include(GNUInstallDirs)
include(CMakeDependentOption)
include(FeatureSummary)

cmake_dependent_option(OPUS_VAR_ARRAYS 
                      "Use variable length arrays for stack arrays" 
                      ON
                      "VLA_SUPPORTED; NOT OPUS_USE_ALLOCA; NOT OPUS_NONTHREADSAFE_PSEUDOSTACK"
                      OFF)
cmake_dependent_option(OPUS_USE_ALLOCA 
                       "Use alloca for stack arrays (on non-C99 compilers)" 
                       ON
                       "USE_ALLOCA_SUPPORTED; NOT OPUS_VAR_ARRAYS; NOT OPUS_NONTHREADSAFE_PSEUDOSTACK"
                       OFF)
cmake_dependent_option(OPUS_NONTHREADSAFE_PSEUDOSTACK 
                       "Use a non threadsafe pseudostack when neither variable length arrays or alloca is supported"
                       ON
                       "NOT OPUS_VAR_ARRAYS; NOT OPUS_USE_ALLOCA"
                       OFF)

cmake_dependent_option(OPUS_FAST_MATH
                       "Enable fast math"
                       ON
                       "OPUS_FLOAT_APPROX; OPUS_FAST_MATH"
                       OFF)

if(OPUS_FAST_MATH)
  if(MSVC)
    check_and_set_flag(FAST_MATH /fp:fast)
  else()
    check_and_set_flag(FAST_MATH -ffast-math)
  endif()
endif()

if(OPUS_BUILD_SHARED_LIBRARY OR BUILD_SHARED_LIBS OR OPUS_BUILD_FRAMEWORK)
  # Global flag to cause add_library() to create shared libraries if on.
  set(BUILD_SHARED_LIBS ON)
  set(OPUS_BUILD_SHARED_LIBRARY ON)
endif()

if(OPUS_BUILD_TESTING OR BUILD_TESTING)
  set(OPUS_BUILD_TESTING ON)
  set(BUILD_TESTING ON)
endif()

if(OPUS_STACK_PROTECTOR)
  if(MSVC) # GC on by default on MSVC
    check_and_set_flag(STACK_PROTECTOR /GS)
  else()
    check_and_set_flag(STACK_PROTECTOR -fstack-protector-strong)
  endif()
else()
  if(MSVC)
    check_and_set_flag(STACK_PROTECTOR_DISABLED /GS-)
    if (STACK_PROTECTOR_DISABLED_SUPPORTED)
      set(STACK_PROTECTOR_SUPPORTED OFF)
    endif()
  else()
    set(STACK_PROTECTOR_SUPPORTED OFF)
  endif()
endif()

if(OPUS_CPU_X86 OR OPUS_CPU_X64)
  cmake_dependent_option(OPUS_X86_MAY_HAVE_SSE
                         "Does runtime check for SSE1 support"
                         ON
                         "SSE1_SUPPORTED"
                         OFF)
  cmake_dependent_option(OPUS_X86_MAY_HAVE_SSE2
                         "Does runtime check for SSE2 support"
                         ON
                         "SSE2_SUPPORTED"
                         OFF)
  cmake_dependent_option(OPUS_X86_MAY_HAVE_SSE4_1
                         "Does runtime check for SSE4.1 support"
                         ON
                         "SSE4_1_SUPPORTED"
                         OFF)
  cmake_dependent_option(OPUS_X86_MAY_HAVE_AVX
                         "Does runtime check for AVX support"
                         ON
                         "AVX_SUPPORTED"
                         OFF)

  # PRESUME depends on MAY HAVE, but PRESUME will override runtime detection
  if(OPUS_CPU_X64) # Assume 64 bit has SSE2 support
    cmake_dependent_option(OPUS_X86_PRESUME_SSE
                           "Assume target CPU has SSE1 support"
                           ON
                           "OPUS_X86_MAY_HAVE_SSE"
                           OFF)
    cmake_dependent_option(OPUS_X86_PRESUME_SSE2
                           "Assume target CPU has SSE2 support"
                           ON
                           "OPUS_X86_MAY_HAVE_SSE2"
                           OFF)
  else()
    cmake_dependent_option(OPUS_X86_PRESUME_SSE
                           "Assume target CPU has SSE1 support"
                           OFF
                           "OPUS_X86_MAY_HAVE_SSE"
                           OFF)
    cmake_dependent_option(OPUS_X86_PRESUME_SSE2
                           "Assume target CPU has SSE2 support"
                           OFF
                           "OPUS_X86_MAY_HAVE_SSE2"
                           OFF)
  endif()
  cmake_dependent_option(OPUS_X86_PRESUME_SSE4_1
                         "Assume target CPU has SSE4.1 support"
                         OFF
                         "OPUS_X86_MAY_HAVE_SSE4_1"
                         OFF)
  cmake_dependent_option(OPUS_X86_PRESUME_AVX
                         "Assume target CPU has AVX support"
                         OFF
                         "OPUS_X86_MAY_HAVE_AVX"
                         OFF)
endif()

set_package_properties(Git
                       PROPERTIES
                       TYPE
                       REQUIRED
                       DESCRIPTION
                       "fast, scalable, distributed revision control system"
                       URL
                       "https://git-scm.com/"
                       PURPOSE
                       "required to set up package version")

add_feature_info(OPUS_BUILD_SHARED_LIBRARY OPUS_BUILD_SHARED_LIBRARY "Build shared library")
add_feature_info(OPUS_STACK_PROTECTOR STACK_PROTECTOR_SUPPORTED "Use stack protection")
add_feature_info(OPUS_VAR_ARRAYS OPUS_VAR_ARRAYS 
                 "Use variable length arrays for stack arrays")
add_feature_info(OPUS_USE_ALLOCA OPUS_USE_ALLOCA
                 "Use alloca for stack arrays (on non-C99 compilers)")
add_feature_info(OPUS_NONTHREADSAFE_PSEUDOSTACK OPUS_NONTHREADSAFE_PSEUDOSTACK 
                 "Use a non threadsafe pseudostack when neither variable length arrays or alloca is supported")
add_feature_info(OPUS_CUSTOM_MODES OPUS_CUSTOM_MODES
                 "Enable non-Opus modes, e.g. 44.1 kHz & 2^n frames")
add_feature_info(OPUS_BUILD_TESTING OPUS_BUILD_TESTING "Build test programs")
add_feature_info(OPUS_BUILD_PROGRAMS OPUS_BUILD_PROGRAMS "Build programs")
add_feature_info(
  OPUS_FIXED_POINT OPUS_FIXED_POINT
  "compile as fixed-point (for machines without a fast enough FPU)")
add_feature_info(
  OPUS_FLOAT_API OPUS_ENABLE_FLOAT_API
  "compile with the floating point API (for machines with float library)")
add_feature_info(OPUS_FLOAT_APPROX OPUS_FLOAT_APPROX
  "Enable floating point approximations (Ensure your platform supports IEEE 754 before enabling)")
add_feature_info(OPUS_FAST_MATH FAST_MATH_SUPPORTED "Enable fast math, (depending on OPUS_FLOAT_APPROX to be enabled)")
add_feature_info(OPUS_INSTALL_PKG_CONFIG_MODULE OPUS_INSTALL_PKG_CONFIG_MODULE
                 "install PkgConfig module")
add_feature_info(OPUS_INSTALL_CMAKE_CONFIG_MODULE OPUS_INSTALL_CMAKE_CONFIG_MODULE
                 "install CMake package config module")
add_feature_info(OPUS_BUILD_FRAMEWORK OPUS_BUILD_FRAMEWORK "Build Framework bundle for Apple systems")

if(OPUS_CPU_X86 OR OPUS_CPU_X64)
  add_feature_info(OPUS_X86_MAY_HAVE_SSE OPUS_X86_MAY_HAVE_SSE
                   "does runtime check for SSE1 support")
  add_feature_info(OPUS_X86_MAY_HAVE_SSE2 OPUS_X86_MAY_HAVE_SSE2
                   "does runtime check for SSE2 support")
  add_feature_info(OPUS_X86_MAY_HAVE_SSE4_1 OPUS_X86_MAY_HAVE_SSE4_1
                   "does runtime check for SSE4_1 support")
  add_feature_info(OPUS_X86_MAY_HAVE_AVX OPUS_X86_MAY_HAVE_AVX
                   "does runtime check for AVX support")
  add_feature_info(OPUS_X86_PRESUME_SSE OPUS_X86_PRESUME_SSE
                   "assume target CPU has SSE1 support will override the runtime check")
  add_feature_info(OPUS_X86_PRESUME_SSE2 OPUS_X86_PRESUME_SSE2
                   "assume target CPU has SSE2 support will override the runtime check")
  add_feature_info(OPUS_X86_PRESUME_SSE4_1 OPUS_X86_PRESUME_SSE4_1
                   "assume target CPU has SSE4_1 support will override the runtime check")
  add_feature_info(OPUS_X86_PRESUME_AVX OPUS_X86_PRESUME_AVX
                   "assume target CPU has AVX support will override the runtime check")
endif()

feature_summary(WHAT ALL)

set(Opus_PUBLIC_HEADER
    ${CMAKE_CURRENT_SOURCE_DIR}/include/opus.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/opus_defines.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/opus_multistream.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/opus_projection.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/opus_types.h)

if(OPUS_CUSTOM_MODES)
  list(APPEND Opus_PUBLIC_HEADER ${CMAKE_CURRENT_SOURCE_DIR}/include/opus_custom.h)
endif()

add_library(opus ${opus_headers} ${opus_sources} ${opus_sources_float} ${Opus_PUBLIC_HEADER})
add_library(Opus::opus ALIAS opus)

set_target_properties(opus
                      PROPERTIES SOVERSION
                                 ${OPUS_LIBRARY_VERSION_MAJOR}
                                 VERSION
                                 ${OPUS_LIBRARY_VERSION}
                                 PUBLIC_HEADER
                                 "${Opus_PUBLIC_HEADER}")

target_include_directories(
  opus
  PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/opus>
  PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
          ${CMAKE_CURRENT_SOURCE_DIR}
          celt
          silk)

target_link_libraries(opus PRIVATE ${OPUS_REQUIRED_LIBRARIES})
target_compile_definitions(opus PRIVATE OPUS_BUILD ENABLE_HARDENING)

if(NOT MSVC)
  target_compile_definitions(opus PRIVATE _FORTIFY_SOURCE=2)
endif()

if(OPUS_FLOAT_APPROX)
  target_compile_definitions(opus PRIVATE FLOAT_APPROX)
endif()

if(OPUS_VAR_ARRAYS)
  target_compile_definitions(opus PRIVATE VAR_ARRAYS)
elseif(OPUS_USE_ALLOCA)
  target_compile_definitions(opus PRIVATE USE_ALLOCA)
elseif(OPUS_NONTHREADSAFE_PSEUDOSTACK)
  target_compile_definitions(opus PRIVATE NONTHREADSAFE_PSEUDOSTACK)
else()
  message(ERROR Neet to set a define for stack allocation)
endif()

if(OPUS_CUSTOM_MODES)
  target_compile_definitions(opus PRIVATE CUSTOM_MODES)
endif()

if(BUILD_SHARED_LIBS)
  if(WIN32)
    target_compile_definitions(opus PRIVATE DLL_EXPORT)
  else()
    include(CheckCCompilerFlag)
    check_c_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
    if(COMPILER_HAS_HIDDEN_VISIBILITY)
      set_target_properties(opus PROPERTIES C_VISIBILITY_PRESET hidden)
    endif()
  endif()
endif()

add_sources_group(opus silk ${silk_headers} ${silk_sources})
add_sources_group(opus celt ${celt_headers} ${celt_sources})

if(OPUS_FIXED_POINT)
  add_sources_group(opus silk ${silk_sources_fixed})
  target_include_directories(opus PRIVATE silk/fixed)
  target_compile_definitions(opus PRIVATE FIXED_POINT=1)
else()
  add_sources_group(opus silk ${silk_sources_float})
  target_include_directories(opus PRIVATE silk/float)
endif()

if(NOT OPUS_ENABLE_FLOAT_API)
  target_compile_definitions(opus PRIVATE DISABLE_FLOAT_API)
endif()

#[[Build flags for SSE will be set the following way:
MSVC: If OPUS_X86_PRESUME_X is set then we will set the highest possible /arch:X
we won't set any ARCH flag for OPUS_X86_MAY_HAVE_SSE due to:
https://randomascii.wordpress.com/2016/12/05/vc-archavx-option-unsafe-at-any-speed/
For non MSVC: we will set the compiler flags on per file basis for OPUS_X86_MAY_HAVE_SSE
for OPUS_X86_PRESUME_X we will set it for the target]]

if((OPUS_X86_MAY_HAVE_SSE AND NOT OPUS_X86_PRESUME_SSE) OR
   (OPUS_X86_MAY_HAVE_SSE2 AND NOT OPUS_X86_PRESUME_SSE2) OR
   (OPUS_X86_MAY_HAVE_SSE4_1 AND NOT OPUS_X86_PRESUME_SSE4_1) OR
   (OPUS_X86_MAY_HAVE_AVX AND NOT OPUS_X86_PRESUME_AVX))
  target_compile_definitions(opus PRIVATE OPUS_HAVE_RTCD)
endif()

if(SSE1_SUPPORTED)
  if(OPUS_X86_MAY_HAVE_SSE)
    add_sources_group(opus celt ${celt_sources_sse})
    target_compile_definitions(opus PRIVATE OPUS_X86_MAY_HAVE_SSE)
    if(NOT MSVC)
      set_source_files_properties(${celt_sources_sse} PROPERTIES COMPILE_FLAGS -msse)
    endif()
  endif()
  if(OPUS_X86_PRESUME_SSE)
    target_compile_definitions(opus PRIVATE OPUS_X86_PRESUME_SSE)
    if(NOT MSVC)
      target_compile_options(opus PRIVATE -msse)
    endif()
  endif()
endif()

if(SSE2_SUPPORTED)
  if(OPUS_X86_MAY_HAVE_SSE2)
    add_sources_group(opus celt ${celt_sources_sse2})
    target_compile_definitions(opus PRIVATE OPUS_X86_MAY_HAVE_SSE2)
    if(NOT MSVC)
      set_source_files_properties(${celt_sources_sse2} PROPERTIES COMPILE_FLAGS -msse2)
    endif()
  endif()
  if(OPUS_X86_PRESUME_SSE2)
    target_compile_definitions(opus PRIVATE OPUS_X86_PRESUME_SSE2)
    if(NOT MSVC)
      target_compile_options(opus PRIVATE -msse2)
    endif()
  endif()
endif()

if(SSE4_1_SUPPORTED)
  if(OPUS_X86_MAY_HAVE_SSE4_1)
    add_sources_group(opus celt ${celt_sources_sse4_1})
    add_sources_group(opus silk ${silk_sources_sse4_1})
    target_compile_definitions(opus PRIVATE OPUS_X86_MAY_HAVE_SSE4_1)
    if(NOT MSVC)
      set_source_files_properties(${celt_sources_sse4_1} ${silk_sources_sse4_1} PROPERTIES COMPILE_FLAGS -msse4.1)
    endif()

    if(OPUS_FIXED_POINT)
      add_sources_group(opus silk ${silk_sources_fixed_sse4_1})
      if(NOT MSVC)
        set_source_files_properties(${silk_sources_fixed_sse4_1} PROPERTIES COMPILE_FLAGS -msse4.1)
      endif()
    endif()
  endif()
  if(OPUS_X86_PRESUME_SSE4_1)
    target_compile_definitions(opus PRIVATE OPUS_X86_PRESUME_SSE4_1)
    if(NOT MSVC)
      target_compile_options(opus PRIVATE -msse4.1)
    endif()
  endif()
endif()

if(AVX_SUPPORTED)
  # mostly placeholder in case of avx intrinsics is added
  if(OPUS_X86_MAY_HAVE_AVX)
    target_compile_definitions(opus PRIVATE OPUS_X86_MAY_HAVE_AVX)
  endif()
  if(OPUS_X86_PRESUME_AVX)
    target_compile_definitions(opus PRIVATE OPUS_X86_PRESUME_AVX)
    if(NOT MSVC)
      target_compile_options(opus PRIVATE -mavx)
    endif()
  endif()
endif()

if(MSVC)
  if(AVX_SUPPORTED AND OPUS_X86_PRESUME_AVX) # on 64 bit and 32 bits
    add_definitions(/arch:AVX)
  elseif(OPUS_CPU_X86) # if AVX not supported then set SSE flag
    if((SSE4_1_SUPPORTED AND OPUS_X86_PRESUME_SSE4_1)
       OR (SSE2_SUPPORTED AND OPUS_X86_PRESUME_SSE2))
      target_compile_definitions(opus PRIVATE /arch:SSE2)
    elseif(SSE1_SUPPORTED AND OPUS_X86_PRESUME_SSE)
      target_compile_definitions(opus PRIVATE /arch:SSE)
    endif()
  endif()
endif()

if(CMAKE_SYSTEM_PROCESSOR MATCHES "(arm|aarch64)")
  add_sources_group(opus celt ${celt_sources_arm})
endif()

if(COMPILER_SUPPORT_NEON AND OPUS_USE_NEON)

  if(OPUS_MAY_HAVE_NEON)
    if(RUNTIME_CPU_CAPABILITY_DETECTION)
      message(STATUS "OPUS_MAY_HAVE_NEON enabling runtime detection")
      target_compile_definitions(opus PRIVATE OPUS_HAVE_RTCD)
    else()
      message(ERROR "Runtime cpu capability detection needed for MAY_HAVE_NEON")
    endif()
    # Do runtime check for NEON
    target_compile_definitions(opus
                               PRIVATE
                               OPUS_ARM_MAY_HAVE_NEON
                               OPUS_ARM_MAY_HAVE_NEON_INTR)
  endif()

  add_sources_group(opus celt ${celt_sources_arm_neon_intr})
  add_sources_group(opus silk ${silk_sources_arm_neon_intr})

  # silk arm neon depends on main_Fix.h
  target_include_directories(opus PRIVATE silk/fixed)

  if(OPUS_FIXED_POINT)
    add_sources_group(opus silk ${silk_sources_fixed_arm_neon_intr})
  endif()

  if(OPUS_PRESUME_NEON)
    target_compile_definitions(opus
                               PRIVATE
                               OPUS_ARM_PRESUME_NEON
                               OPUS_ARM_PRESUME_NEON_INTR)
  endif()
endif()

target_compile_definitions(opus
                           PRIVATE
                           $<$<BOOL:${HAVE_LRINT}>:HAVE_LRINT>
                           $<$<BOOL:${HAVE_LRINTF}>:HAVE_LRINTF>)

if(OPUS_BUILD_FRAMEWORK)
  set_target_properties(opus PROPERTIES
                        FRAMEWORK TRUE
                        FRAMEWORK_VERSION ${PROJECT_VERSION}
                        MACOSX_FRAMEWORK_IDENTIFIER org.xiph.opus
                        MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PROJECT_VERSION}
                        MACOSX_FRAMEWORK_BUNDLE_VERSION ${PROJECT_VERSION}
                        XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
                        OUTPUT_NAME Opus)
endif()

install(TARGETS opus
        EXPORT OpusTargets
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
        FRAMEWORK DESTINATION ${CMAKE_INSTALL_PREFIX}
        PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/opus)

if(OPUS_INSTALL_PKG_CONFIG_MODULE)
  set(prefix ${CMAKE_INSTALL_PREFIX})
  set(exec_prefix ${CMAKE_INSTALL_PREFIX})
  set(libdir ${CMAKE_INSTALL_FULL_LIBDIR})
  set(includedir ${CMAKE_INSTALL_FULL_INCLUDEDIR})
  set(VERSION ${PACKAGE_VERSION})
  if(HAVE_LIBM)
    set(LIBM "-lm")
  endif()
  configure_file(opus.pc.in opus.pc)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/opus.pc
          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
endif()

if(OPUS_INSTALL_CMAKE_CONFIG_MODULE)
  set(CPACK_GENERATOR TGZ)
  include(CPack)
  set(CMAKE_INSTALL_PACKAGEDIR ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
  install(EXPORT OpusTargets
          NAMESPACE Opus::
          DESTINATION ${CMAKE_INSTALL_PACKAGEDIR})

  include(CMakePackageConfigHelpers)

  set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR})
  configure_package_config_file(${CMAKE_SOURCE_DIR}/cmake/OpusConfig.cmake.in
                                OpusConfig.cmake
                                INSTALL_DESTINATION
                                ${CMAKE_INSTALL_PACKAGEDIR}
                                PATH_VARS
                                INCLUDE_INSTALL_DIR
                                INSTALL_PREFIX
                                ${CMAKE_INSTALL_PREFIX})
  write_basic_package_version_file(OpusConfigVersion.cmake
                                   VERSION ${PROJECT_VERSION}
                                   COMPATIBILITY SameMajorVersion)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/OpusConfig.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/OpusConfigVersion.cmake
          DESTINATION ${CMAKE_INSTALL_PACKAGEDIR})
endif()

if(OPUS_BUILD_PROGRAMS)
  # demo
  if(OPUS_CUSTOM_MODES)
    add_executable(opus_custom_demo ${opus_custom_demo_sources})
    target_include_directories(opus_custom_demo
                               PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
    target_link_libraries(opus_custom_demo PRIVATE opus)
  endif()

  add_executable(opus_demo ${opus_demo_sources})
  target_include_directories(opus_demo PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
  target_include_directories(opus_demo PRIVATE silk) # debug.h
  target_include_directories(opus_demo PRIVATE celt) # arch.h
  target_link_libraries(opus_demo PRIVATE opus ${OPUS_REQUIRED_LIBRARIES})

  # compare
  add_executable(opus_compare ${opus_compare_sources})
  target_include_directories(opus_compare PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
  target_link_libraries(opus_compare PRIVATE opus ${OPUS_REQUIRED_LIBRARIES})
endif()

if(BUILD_TESTING)
  enable_testing()

  # tests
  add_executable(test_opus_decode ${test_opus_decode_sources})
  target_include_directories(test_opus_decode
                             PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
  target_link_libraries(test_opus_decode PRIVATE opus)
  if(OPUS_FIXED_POINT)
    target_compile_definitions(test_opus_decode PRIVATE DISABLE_FLOAT_API)
  endif()
  add_test(test_opus_decode test_opus_decode)

  add_executable(test_opus_padding ${test_opus_padding_sources})
  target_include_directories(test_opus_padding
                             PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
  target_link_libraries(test_opus_padding PRIVATE opus)
  add_test(test_opus_padding test_opus_padding)

  if(NOT BUILD_SHARED_LIBS)
    # disable tests that depends on private API when building shared lib
    add_executable(test_opus_api ${test_opus_api_sources})
    target_include_directories(test_opus_api
                               PRIVATE ${CMAKE_CURRENT_BINARY_DIR} celt)
    target_link_libraries(test_opus_api PRIVATE opus)
    if(OPUS_FIXED_POINT)
      target_compile_definitions(test_opus_api PRIVATE DISABLE_FLOAT_API)
    endif()
    add_test(test_opus_api test_opus_api)

    add_executable(test_opus_encode ${test_opus_encode_sources})
    target_include_directories(test_opus_encode
                               PRIVATE ${CMAKE_CURRENT_BINARY_DIR} celt)
    target_link_libraries(test_opus_encode PRIVATE opus)
    add_test(test_opus_encode test_opus_encode)
  endif()
endif()