Add doc/support/generate.sh

doc/support/compat.sh

Index: doc/support/compat.sh
diff --git a/doc/support/compat.sh b/doc/support/compat.sh
new file mode 100644
index 0000000000000000000000000000000000000000..e71352394416adcb7fcf7656a3300ba0696621e5
--- /dev/null
+++ b/doc/support/compat.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Copyright 2015 The Crashpad Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+if [[ "${BASH_SOURCE[0]}" = "${0}" ]]; then
+  echo "${0}: this file must be sourced, not run directly" >& 2
+  exit 1
+fi
+
+# Some extensions of command-line tools behave differently on different systems.
+# $sed_ext should be a sed invocation that enables extended regular expressions.
+# $date_time_t should be a date invocation that causes it to print the date and
+# time corresponding to a time_t string that immediately follows it.
+case "$(uname -s)" in
+  Darwin)
+    sed_ext="sed -E"
+    date_time_t="date -r"
+    ;;
+  Linux)
+    sed_ext="sed -r"
+    date_time_t="date -d@"
+    ;;
+  *)
+    echo "${0}: unknown operating system" >& 2
+    exit 1
+    ;;
+esac