1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/aom/build/cmake/exports.cmake b/third_party/aom/build/cmake/exports.cmake
new file mode 100644
index 000000000..8153aad98
--- /dev/null
+++ b/third_party/aom/build/cmake/exports.cmake
@@ -0,0 +1,65 @@
+##
+## 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.
+##
+if (NOT AOM_BUILD_CMAKE_EXPORTS_CMAKE_)
+set(AOM_BUILD_CMAKE_EXPORTS_CMAKE_ 1)
+
+include("${AOM_ROOT}/build/cmake/exports_sources.cmake")
+
+# Creates the custom target which handles generation of the symbol export lists.
+function (setup_exports_target)
+  if ("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
+    set(symbol_file_ext "syms")
+  elseif ("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS" AND MSVC)
+    set(symbol_file_ext "def")
+  else ()
+    set(symbol_file_ext "ver")
+  endif ()
+
+  set(aom_sym_file "${AOM_CONFIG_DIR}/libaom.${symbol_file_ext}")
+
+  add_custom_target(generate_exports
+                    COMMAND ${CMAKE_COMMAND}
+                      -DAOM_ROOT="${AOM_ROOT}"
+                      -DAOM_CONFIG_DIR="${AOM_CONFIG_DIR}"
+                      -DAOM_TARGET_SYSTEM=${AOM_TARGET_SYSTEM}
+                      -DAOM_SYM_FILE="${aom_sym_file}"
+                      -DAOM_MSVC=${MSVC}
+                      -DAOM_XCODE=${XCODE}
+                      -DCONFIG_NAME=$<CONFIG>
+                      -DCONFIG_AV1_DECODER=${CONFIG_AV1_DECODER}
+                      -DCONFIG_AV1_ENCODER=${CONFIG_AV1_ENCODER}
+                      -P "${AOM_ROOT}/build/cmake/generate_exports.cmake"
+                    SOURCES ${AOM_EXPORTS_SOURCES}
+                    DEPENDS ${AOM_EXPORTS_SOURCES})
+
+  # Make libaom depend on the exports file, and set flags to pick it up when
+  # creating the dylib.
+  add_dependencies(aom generate_exports)
+
+  if (APPLE)
+    set_property(TARGET aom APPEND_STRING PROPERTY LINK_FLAGS
+                 "-exported_symbols_list ${aom_sym_file}")
+  elseif (WIN32)
+    message(FATAL_ERROR "Windows DLL builds not supported yet.")
+    if (NOT MSVC)
+      set_property(TARGET aom APPEND_STRING PROPERTY LINK_FLAGS
+                   "-Wl,--version-script ${aom_sym_file}")
+    endif ()
+
+    # TODO(tomfinegan): Sort out the import lib situation and flags for MSVC.
+
+  else ()
+    set_property(TARGET aom APPEND_STRING PROPERTY LINK_FLAGS
+                 "-Wl,--version-script,${aom_sym_file}")
+  endif ()
+endfunction ()
+
+endif ()  # AOM_BUILD_CMAKE_EXPORTS_CMAKE_