add parallel third-party cmake

third_party/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(parallel)

third_party/parallel/CMakeLists.txt

@@ -0,0 +1,26 @@
+set(URL http://ftp.gnu.org/gnu/parallel/parallel-20141022.tar.bz2)
+set(FILE_NAME parallel.tar.bz2)
+
+set(FILE_DIR ${CMAKE_CURRENT_DIR})
+set(FILE_PATH ${FILE_DIR}/${FILE_NAME})
+
+message(STATUS "downloading: ${FILE_NAME}")
+
+file(DOWNLOAD ${URL} ${FILE_PATH}
+     EXPECTED_MD5 c01f53f9f6cc721a81591308f9e689c4
+     STATUS status
+     LOG log)
+
+message(STATUS "downloading: ${FILE_NAME} - done")
+
+message(STATUS "extracting ... ${FILE_PATH}")
+
+if(NOT EXISTS "${FILE_PATH}")
+  message(FATAL_ERROR "error: file to extract does not exist: '${FILE_NAME}'")
+endif()
+
+execute_process(COMMAND ${CMAKE_COMMAND} -E tar xjf ${FILE_PATH}
+                WORKING_DIRECTORY ${FILE_DIR}
+                RESULT_VARIABLE rv)
+
+message(STATUS "extracting ... done")