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-rw-r--r--src/seastar/cmake/Findragel.cmake45
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diff --git a/src/seastar/cmake/Findragel.cmake b/src/seastar/cmake/Findragel.cmake
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+#
+# This file is open source software, licensed to you under the terms
+# of the Apache License, Version 2.0 (the "License"). See the NOTICE file
+# distributed with this work for additional information regarding copyright
+# ownership. 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.
+#
+
+#
+# Copyright (C) 2018 Scylladb, Ltd.
+#
+
+find_program (
+ ragel_RAGEL_EXECUTABLE
+ ragel)
+
+mark_as_advanced (ragel_RAGEL_EXECUTABLE)
+
+set (_ragel_version_pattern "[0-9]+\\.[0-9]+\\.[0-9]+(\\.[0-9]+)?")
+
+if (ragel_RAGEL_EXECUTABLE)
+ set (ragel_FOUND ON)
+
+ exec_program (${ragel_RAGEL_EXECUTABLE}
+ ARGS -v
+ OUTPUT_VARIABLE _ragel_version_output)
+
+ if (${_ragel_version_output} MATCHES "version (${_ragel_version_pattern})")
+ set (ragel_VERSION ${CMAKE_MATCH_1})
+ endif ()
+endif ()
+
+find_package_handle_standard_args (ragel
+ REQUIRED_VARS ragel_RAGEL_EXECUTABLE
+ VERSION_VAR ragel_VERSION)