obs-studio/cmake/Modules/FindMbedTLS.cmake

# Once done these will be defined:
#
# * MBEDTLS_FOUND
# * MBEDTLS_INCLUDE_DIRS
# * MBEDTLS_LIBRARIES
#

find_package(PkgConfig QUIET)
if(PKG_CONFIG_FOUND)
  pkg_check_modules(_MBEDTLS QUIET mbedtls)
endif()

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

# If we're on MacOS or Linux, please try to statically-link mbedtls.
if(ENABLE_STATIC_MBEDTLS AND (APPLE OR UNIX))
  set(_MBEDTLS_LIBRARIES libmbedtls.a)
  set(_MBEDCRYPTO_LIBRARIES libmbedcrypto.a)
  set(_MBEDX509_LIBRARIES libmbedx509.a)
endif()

find_path(
  MBEDTLS_INCLUDE_DIR
  NAMES mbedtls/ssl.h
  HINTS ENV MBEDTLS_PATH ${MBEDTLS_PATH} ${CMAKE_SOURCE_DIR}/${MBEDTLS_PATH} ${_MBEDTLS_INCLUDE_DIRS}
  PATHS /usr/include /usr/local/include /opt/local/include /sw/include
  PATH_SUFFIXES include)

find_library(
  MBEDTLS_LIB
  NAMES ${_MBEDTLS_LIBRARIES} mbedtls libmbedtls
  HINTS ENV MBEDTLS_PATH ${MBEDTLS_PATH} ${CMAKE_SOURCE_DIR}/${MBEDTLS_PATH} ${_MBEDTLS_LIBRARY_DIRS}
  PATHS /usr/lib /usr/local/lib /opt/local/lib /sw/lib
  PATH_SUFFIXES
    lib${_lib_suffix}
    lib
    libs${_lib_suffix}
    libs
    bin${_lib_suffix}
    bin
    ../lib${_lib_suffix}
    ../lib
    ../libs${_lib_suffix}
    ../libs
    ../bin${_lib_suffix}
    ../bin)

find_library(
  MBEDCRYPTO_LIB
  NAMES ${_MBEDCRYPTO_LIBRARIES} mbedcrypto libmbedcrypto
  HINTS ENV MBEDCRYPTO_PATH ${MBEDCRYPTO_PATH} ${CMAKE_SOURCE_DIR}/${MBEDCRYPTO_PATH} ${_MBEDCRYPTO_LIBRARY_DIRS}
  PATHS /usr/lib /usr/local/lib /opt/local/lib /sw/lib
  PATH_SUFFIXES
    lib${_lib_suffix}
    lib
    libs${_lib_suffix}
    libs
    bin${_lib_suffix}
    bin
    ../lib${_lib_suffix}
    ../lib
    ../libs${_lib_suffix}
    ../libs
    ../bin${_lib_suffix}
    ../bin)

find_library(
  MBEDX509_LIB
  NAMES ${_MBEDX509_LIBRARIES} mbedx509 libmbedx509
  HINTS ENV MBEDX509_PATH ${MBEDX509_PATH} ${CMAKE_SOURCE_DIR}/${MBEDX509_PATH} ${_MBEDX509_LIBRARY_DIRS}
  PATHS /usr/lib /usr/local/lib /opt/local/lib /sw/lib
  PATH_SUFFIXES
    lib${_lib_suffix}
    lib
    libs${_lib_suffix}
    libs
    bin${_lib_suffix}
    bin
    ../lib${_lib_suffix}
    ../lib
    ../libs${_lib_suffix}
    ../libs
    ../bin${_lib_suffix}
    ../bin)

# Sometimes mbedtls is split between three libs, and sometimes it isn't. If it isn't, let's check if the symbols we need
# are all in MBEDTLS_LIB.
if(MBEDTLS_LIB
   AND NOT MBEDCRYPTO_LIB
   AND NOT MBEDX509_LIB)
  set(CMAKE_REQUIRED_LIBRARIES ${MBEDTLS_LIB})
  set(CMAKE_REQUIRED_INCLUDES ${MBEDTLS_INCLUDE_DIR})
  include(CheckSymbolExists)
  check_symbol_exists(mbedtls_x509_crt_init "mbedtls/x509_crt.h" MBEDTLS_INCLUDES_X509)
  check_symbol_exists(mbedtls_sha256_init "mbedtls/sha256.h" MBEDTLS_INCLUDES_CRYPTO)
  unset(CMAKE_REQUIRED_INCLUDES)
  unset(CMAKE_REQUIRED_LIBRARIES)
endif()

# If we find all three libraries, then go ahead.
if(MBEDTLS_LIB
   AND MBEDCRYPTO_LIB
   AND MBEDX509_LIB)
  set(MBEDTLS_INCLUDE_DIRS ${MBEDTLS_INCLUDE_DIR})
  set(MBEDTLS_LIBRARIES ${MBEDTLS_LIB} ${MBEDCRYPTO_LIB} ${MBEDX509_LIB})

  foreach(component TLS CRYPTO X509)
    if(NOT TARGET Mbedtls::${component} AND MBED${component}_LIB)
      if(IS_ABSOLUTE "${MBED${component}_LIB}")
        add_library(Mbedtls::${component} UNKNOWN IMPORTED)
        set_target_properties(Mbedtls::${component} PROPERTIES IMPORTED_LOCATION "${MBED${component}_LIB}")
      else()
        add_library(Mbedtls::${component} INTERFACE IMPORTED)
        set_target_properties(Mbedtls::${component} PROPERTIES IMPORTED_LIBNAME "${MBED${component}_LIB}")
      endif()

      set_target_properties(Mbedtls::${component} PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
                                                             "${MBED${component}_INCLUDE_DIR}")
    endif()
  endforeach()

  if(NOT TARGET Mbedtls::Mbedtls)
    add_library(Mbedtls::Mbedtls INTERFACE IMPORTED)
    target_link_libraries(Mbedtls::Mbedtls INTERFACE Mbedtls::TLS Mbedtls::CRYPTO Mbedtls::X509)
  endif()

  # Otherwise, if we find MBEDTLS_LIB, and it has both CRYPTO and x509 within the single lib (i.e. a windows build
  # environment), then also feel free to go ahead.
elseif(
  MBEDTLS_LIB
  AND MBEDTLS_INCLUDES_CRYPTO
  AND MBEDTLS_INCLUDES_X509)
  set(MBEDTLS_INCLUDE_DIRS ${MBEDTLS_INCLUDE_DIR})
  set(MBEDTLS_LIBRARIES ${MBEDTLS_LIB})

  if(NOT TARGET Mbedtls::Mbedtls)
    if(IS_ABSOLUTE "${MBED${component}_LIB}")
      add_library(Mbedtls::${component} UNKNOWN IMPORTED)
      set_target_properties(Mbedtls::${component} PROPERTIES IMPORTED_LOCATION "${MBEDTLS_LIBRARIES}")
    else()
      add_library(Mbedtls::${component} INTERFACE IMPORTED)
      set_target_properties(Mbedtls::${component} PROPERTIES IMPORTED_LIBNAME "${MBEDTLS_LIBRARIES}")
    endif()

    set_target_properties(Mbedtls::${component} PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${MBEDTLS_INCLUDE_DIRS}")
  endif()
endif()

# Now we've accounted for the 3-vs-1 library case:
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(MbedTLS DEFAULT_MSG MBEDTLS_LIBRARIES MBEDTLS_INCLUDE_DIRS)
mark_as_advanced(MBEDTLS_INCLUDE_DIR MBEDTLS_LIB MBEDCRYPTO_LIB MBEDX509_LIB)