1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/aom/build/cmake/version.cmake b/third_party/aom/build/cmake/version.cmake
new file mode 100644
index 0000000000..d169b12ac6
--- /dev/null
+++ b/third_party/aom/build/cmake/version.cmake
@@ -0,0 +1,57 @@
+#
+# 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 3.5)
+
+set(REQUIRED_ARGS "AOM_ROOT" "AOM_CONFIG_DIR" "GIT_EXECUTABLE"
+    "PERL_EXECUTABLE")
+
+foreach(arg ${REQUIRED_ARGS})
+  if("${${arg}}" STREQUAL "")
+    message(FATAL_ERROR "${arg} must not be empty.")
+  endif()
+endforeach()
+
+include("${AOM_ROOT}/build/cmake/util.cmake")
+
+# Generate the version string for this run.
+unset(aom_version)
+if(EXISTS "${GIT_EXECUTABLE}")
+  execute_process(COMMAND ${GIT_EXECUTABLE} --git-dir=${AOM_ROOT}/.git describe
+                  OUTPUT_VARIABLE aom_version ERROR_QUIET)
+  string(STRIP "${aom_version}" aom_version)
+
+  # Remove the leading 'v' from the version string.
+  string(FIND "${aom_version}" "v" v_pos)
+  if(${v_pos} EQUAL 0)
+    string(SUBSTRING "${aom_version}" 1 -1 aom_version)
+  endif()
+endif()
+
+if("${aom_version}" STREQUAL "")
+  set(aom_version "${AOM_ROOT}/CHANGELOG")
+endif()
+
+unset(last_aom_version)
+if(EXISTS "${AOM_CONFIG_DIR}/config/aom_version.h")
+  extract_version_string("${AOM_CONFIG_DIR}/config/aom_version.h"
+                         last_aom_version)
+endif()
+
+if(NOT "${aom_version}" STREQUAL "${last_aom_version}")
+
+  # TODO(tomfinegan): Perl dependency is unnecessary. CMake can do everything
+  # that is done by version.pl on its own (if a bit more verbose...).
+  execute_process(COMMAND
+                    ${PERL_EXECUTABLE} "${AOM_ROOT}/build/cmake/version.pl"
+                    --version_data=${aom_version}
+                    --version_filename=${AOM_CONFIG_DIR}/config/aom_version.h
+                    VERBATIM)
+endif()