cmake/generate_exports.cmake

#
# Copyright (c) 2017, Alliance for Open Media. All rights reserved.
#
# This source code is subject to the terms of the BSD 2 Clause License and the
# Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License was
# not distributed with this source code in the LICENSE file, you can obtain it
# at www.aomedia.org/license/software. If the Alliance for Open Media Patent
# License 1.0 was not distributed with this source code in the PATENTS file, you
# can obtain it at www.aomedia.org/license/patent.
#
cmake_minimum_required(VERSION 3.16)

# CMAKE_SHARED_LIBRARY_PREFIX can be empty
set(REQUIRED_ARGS "AOM_ROOT" "AOM_CONFIG_DIR" "AOM_TARGET_SYSTEM" "AOM_SYM_FILE"
                  "CONFIG_AV1_DECODER" "CONFIG_AV1_ENCODER")

foreach(arg ${REQUIRED_ARGS})
  if("${${arg}}" STREQUAL "")
    message(FATAL_ERROR "${arg} must not be empty.")
  endif()
endforeach()

include("${AOM_ROOT}/cmake/exports_sources.cmake")

if("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
  set(symbol_prefix "_")
elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS")
  file(WRITE "${AOM_SYM_FILE}" "LIBRARY ${CMAKE_SHARED_LIBRARY_PREFIX}aom\n"
                               "EXPORTS\n")
else()
  set(symbol_suffix ";")
endif()

set(aom_sym_file "${AOM_SYM_FILE}")

if("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
  file(REMOVE "${aom_sym_file}")
elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS")
  file(WRITE "${aom_sym_file}" "LIBRARY ${CMAKE_SHARED_LIBRARY_PREFIX}aom\n"
                               "EXPORTS\n")
else()
  file(WRITE "${aom_sym_file}" "{\nglobal:\n")
endif()

foreach(export_file ${AOM_EXPORTS_SOURCES})
  file(STRINGS "${export_file}" exported_file_data)
  set(exported_symbols "${exported_symbols} ${exported_file_data};")
  string(STRIP "${exported_symbols}" exported_symbols)
endforeach()

foreach(exported_symbol ${exported_symbols})
  string(STRIP "${exported_symbol}" exported_symbol)
  if("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS")
    string(SUBSTRING ${exported_symbol} 0 4 export_type)
    string(COMPARE EQUAL "${export_type}" "data" is_data)
    if(is_data)
      set(symbol_suffix " DATA")
    else()
      set(symbol_suffix "")
    endif()
  endif()
  string(REGEX REPLACE "text \|data " "" "exported_symbol" "${exported_symbol}")
  set(exported_symbol "  ${symbol_prefix}${exported_symbol}${symbol_suffix}")
  file(APPEND "${aom_sym_file}" "${exported_symbol}\n")
endforeach()

if("${aom_sym_file}" MATCHES "ver$")
  file(APPEND "${aom_sym_file}" " \nlocal:\n  *;\n};")
endif()