Made lz4 external dependency #48 (#106)

README.md

@@ -26,8 +26,10 @@ If you ok with this warning, then...
 - xxhash
 - zlib
 - zstd
+- lz4
 - snappy 1.1.8+
 
+
 ## Runtime requirements
 
 - libidn11-dev (IDN)
@@ -39,7 +41,7 @@ If you ok with this warning, then...
 sudo apt-get -y update
 sudo apt-get -y install git cmake ninja-build libidn11-dev ragel yasm protobuf-compiler \
   protobuf-compiler-grpc libprotobuf-dev libgrpc++-dev libgrpc-dev libgrpc++1 libgrpc10 \
-  rapidjson-dev zlib1g-dev libxxhash-dev libzstd-dev libsnappy-dev
+  rapidjson-dev zlib1g-dev libxxhash-dev libzstd-dev libsnappy-dev liblz4-dev
 
 wget https://apt.llvm.org/llvm.sh
 chmod u+x llvm.sh

cmake/FindLZ4.cmake

@@ -0,0 +1,26 @@
+find_library(LZ4_LIBRARIES
+    NAMES lz4 liblz4
+    HINTS $ENV{LZ4_ROOT}/lib
+)
+
+find_path(LZ4_INCLUDE_DIR
+    NAMES lz4.h lz4hc.h
+    HINTS $ENV{LZ4_ROOT}/include
+)
+
+set(LZ4_INCLUDE_DIRS
+  ${LZ4_INCLUDE_DIR}
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LZ4 DEFAULT_MSG LZ4_LIBRARIES LZ4_INCLUDE_DIRS)
+
+mark_as_advanced(LZ4_LIBRARIES LZ4_INCLUDE_DIRS)
+
+if(LZ4_FOUND AND NOT LZ4::LZ4)
+    add_library(LZ4::LZ4 UNKNOWN IMPORTED)
+    set_target_properties( LZ4::LZ4 PROPERTIES
+        INTERFACE_INCLUDE_DIRECTORIES "${LZ4_INCLUDE_DIRS}"
+        IMPORTED_LOCATION ${LZ4_LIBRARIES})
+endif()
+

cmake/external_libs.cmake

@@ -9,6 +9,7 @@ find_package(RapidJSON REQUIRED)
 find_package(ZLIB REQUIRED)
 find_package(xxHash REQUIRED)
 find_package(ZSTD REQUIRED)
+find_package(LZ4 REQUIRED)
 find_package(Snappy 1.1.8 REQUIRED CONFIG)
 
 # rapidjson

contrib/libs/CMakeLists.txt

@@ -5,7 +5,6 @@ add_subdirectory(fastlz)
 add_subdirectory(jwt-cpp)
 add_subdirectory(libbz2)
 add_subdirectory(libc_compat)
-add_subdirectory(lz4)
 add_subdirectory(lzmasdk)
 add_subdirectory(nayuki_md5)
 #add_subdirectory(zstd)