cmake: Add ENABLE_LZ4 option

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 03e8da1dcd730ed0b7693d77f2f64665f92411ff..f0f95419d8cce0cf9cca72d700bf719fc50f5f5f 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -179,6 +179,7 @@ include(CTest)
 
 OPTION(ENABLE_NETTLE "Enable use of Nettle" ON)
 OPTION(ENABLE_OPENSSL "Enable use of OpenSSL" ON)
+OPTION(ENABLE_LZ4 "Enable the use of the system LZ4 library if found" ON)
 OPTION(ENABLE_LZO "Enable the use of the system LZO library if found" OFF)
 OPTION(ENABLE_LZMA "Enable the use of the system LZMA library if found" ON)
 
@@ -509,15 +510,19 @@ MARK_AS_ADVANCED(CLEAR LZO2_LIBRARY)
 #
 # Find LZ4
 #
-IF (LZ4_INCLUDE_DIR)
-  # Already in cache, be silent
-  SET(LZ4_FIND_QUIETLY TRUE)
-ENDIF (LZ4_INCLUDE_DIR)
+IF(ENABLE_LZ4)
+  IF (LZ4_INCLUDE_DIR)
+    # Already in cache, be silent
+    SET(LZ4_FIND_QUIETLY TRUE)
+  ENDIF (LZ4_INCLUDE_DIR)
 
-FIND_PATH(LZ4_INCLUDE_DIR lz4.h)
-FIND_LIBRARY(LZ4_LIBRARY NAMES lz4 liblz4)
-INCLUDE(FindPackageHandleStandardArgs)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(LZ4 DEFAULT_MSG LZ4_LIBRARY LZ4_INCLUDE_DIR)
+  FIND_PATH(LZ4_INCLUDE_DIR lz4.h)
+  FIND_LIBRARY(LZ4_LIBRARY NAMES lz4 liblz4)
+  INCLUDE(FindPackageHandleStandardArgs)
+  FIND_PACKAGE_HANDLE_STANDARD_ARGS(LZ4 DEFAULT_MSG LZ4_LIBRARY LZ4_INCLUDE_DIR)
+ELSE(ENABLE_LZ4)
+  SET(LZ4_FOUND FALSE) # Override cached value
+ENDIF(ENABLE_LZ4)
 IF(LZ4_FOUND)
   SET(HAVE_LIBLZ4 1)
   SET(HAVE_LZ4_H 1)