From 74ac37c10a43b13c827286ee726008c1dd16b087 Mon Sep 17 00:00:00 2001
From: Lorenzo Fontana <lo@linux.com>
Date: Thu, 12 Dec 2019 19:04:07 +0100
Subject: [PATCH] new: allow protobuf to be compiled statically optionally

Co-Authored-By: Leonardo Di Donato <leodidonato@gmail.com>
Signed-off-by: Lorenzo Fontana <lo@linux.com>
---
 cmake/modules/FindProtobuf.cmake | 46 ++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 cmake/modules/FindProtobuf.cmake

diff --git a/cmake/modules/FindProtobuf.cmake b/cmake/modules/FindProtobuf.cmake
new file mode 100644
index 00000000..509d6962
--- /dev/null
+++ b/cmake/modules/FindProtobuf.cmake
@@ -0,0 +1,46 @@
+#
+# Copyright (C) 2019 The Falco Authors.
+#
+# 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.
+#
+
+option(
+  BUILD_STATIC_PROTOBUF
+  "Build a static version of protobuf (useful for building in Operating Systems that don't have the protobuf package)"
+  OFF)
+
+if(NOT BUILD_STATIC_PROTOBUF)
+  # todo(fntlnz, leodido): check that protobuf version is greater or equal than 3.5.0
+  find_program(PROTOC NAMES protoc)
+  find_path(PROTOBUF_INCLUDE NAMES google/protobuf/message.h)
+  find_library(PROTOBUF_LIB NAMES libprotobuf.so)
+  if(PROTOC
+     AND PROTOBUF_INCLUDE
+     AND PROTOBUF_LIB)
+    message(STATUS "Found protobuf: compiler: ${PROTOC}, include: ${PROTOBUF_INCLUDE}, lib: ${PROTOBUF_LIB}")
+  else()
+    message(FATAL_ERROR "Couldn't find system protobuf")
+  endif()
+else()
+  set(PROTOBUF_SRC "${PROJECT_BINARY_DIR}/protobuf-prefix/src/protobuf")
+  message(STATUS "Using bundled protobuf in '${PROTOBUF_SRC}'")
+  set(PROTOC "${PROTOBUF_SRC}/target/bin/protoc")
+  set(PROTOBUF_INCLUDE "${PROTOBUF_SRC}/target/include")
+  set(PROTOBUF_LIB "${PROTOBUF_SRC}/target/lib/libprotobuf.a")
+  ExternalProject_Add(
+    protobuf
+    URL "https://github.com/protocolbuffers/protobuf/releases/download/v3.8.0/protobuf-cpp-3.8.0.tar.gz"
+    URL_MD5 "9054bb5571905a28b3ae787d1d6cf8de"
+    CONFIGURE_COMMAND /usr/bin/env ./configure --with-zlib --prefix=${PROTOBUF_SRC}/target
+    BUILD_COMMAND ${CMD_MAKE}
+    BUILD_IN_SOURCE 1
+    BUILD_BYPRODUCTS ${PROTOC} ${PROTOBUF_INCLUDE} ${PROTOBUF_LIB}
+    INSTALL_COMMAND make install)
+endif()