add vendor packages

cross_compile/vendor_packages/liblz4_vendor/CMakeLists.txt

@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.10)
+project(liblz4_vendor)
+
+# ament_package(CONFIG_EXTRAS liblz4_vendor-extras.cmake)
+
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+
+# uncomment the following section in order to fill in
+# further dependencies manually.
+# find_package(<dependency> REQUIRED)
+
+include(FetchContent)
+FetchContent_Declare(
+  liblz4_vendor
+  URL https://github.com/lz4/lz4/archive/refs/tags/v1.9.4.tar.gz
+  SOURCE_SUBDIR build/cmake
+)
+
+set(BUILD_STATIC_LIBS OFF CACHE BOOL "BUILD_STATIC_LIBS." FORCE)
+set(LZ4_BUILD_LEGACY_LZ4C OFF CACHE BOOL "LZ4_BUILD_LEGACY_LZ4C." FORCE)
+set(LZ4_BUILD_CLI OFF CACHE BOOL "LZ4_BUILD_CLI." FORCE)
+set(LZ4_BUNDLED_MODE OFF CACHE BOOL "LZ4_BUILD_CLI." FORCE)
+set(CMAKE_BUILD_TYPE Release)
+
+FetchContent_MakeAvailable(liblz4_vendor)

cross_compile/vendor_packages/liblz4_vendor/package.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<package format="2">
+  <name>liblz4_vendor</name>
+  <version>0.0.0</version>
+  <maintainer email="ericzhao0325@163.com">ericx</maintainer>
+  <description>LZ4 compression vendor package, providing a dependency for LZ4.</description>
+  <license>Apache License 2.0</license>  <!-- the contents of this package are Apache 2.0 -->
+  <license>BSD</license>  <!-- The LZ4 library is BSD; see README.md for more information -->
+  <license>GPLv2</license>  <!-- All other LZ4 files are GPLv2; see README.md for more information -->
+
+  <url type="website">https://github.com/lz4/lz4/</url>
+
+  <export>
+    <build_type>cmake</build_type>
+  </export>
+</package>