xor: add option to encode with pthreads

CMakeLists.txt

@@ -29,6 +29,9 @@ MESSAGE(STATUS "REDSET_LINK_STATIC: ${REDSET_LINK_STATIC}")
 OPTION(ENABLE_CUDA "Whether to enable CUDA support" OFF)
 MESSAGE(STATUS "ENABLE_CUDA: ${ENABLE_CUDA}")
 
+OPTION(ENABLE_PTHREADS "Whether to enable pthreads support" ON)
+MESSAGE(STATUS "ENABLE_PTHREADS: ${ENABLE_PTHREADS}")
+
 OPTION(ENABLE_TESTS "Whether to build tests" ON)
 MESSAGE(STATUS "ENABLE_TESTS: ${ENABLE_TESTS}")
 
@@ -84,6 +87,16 @@ LIST(APPEND REDSET_EXTERNAL_STATIC_LIBS ZLIB::ZLIB)
 LIST(APPEND REDSET_SERIAL_LIBS ZLIB::ZLIB)
 LIST(APPEND REDSET_SERIAL_STATIC_LIBS ZLIB::ZLIB)
 
+# PTHREADS
+IF(ENABLE_PTHREADS)
+  FIND_PACKAGE(Threads REQUIRED)
+  IF(CMAKE_USE_PTHREADS_INIT)
+      SET(HAVE_PTHREADS TRUE)
+      LIST(APPEND REDSET_EXTERNAL_LIBS Threads::Threads)
+      LIST(APPEND REDSET_EXTERNAL_STATIC_LIBS Threads::Threads)
+  ENDIF()
+ENDIF(ENABLE_PTHREADS)
+
 ## HEADERS
 INCLUDE(CheckIncludeFile)
 INCLUDE(GNUInstallDirs)

cmake/config.h.in

@@ -1,2 +1,3 @@
 // System Specific
 #cmakedefine HAVE_BYTESWAP_H
+#cmakedefine HAVE_PTHREADS

cmake/redsetConfig.cmake.in

@@ -7,4 +7,8 @@ find_dependency(rankstr REQUIRED)
 find_dependency(MPI REQUIRED)
 find_dependency(ZLIB REQUIRED)
 
+if (@HAVE_PTHREADS@)
+  find_dependency(Threads REQUIRED)
+endif()
+
 include("${CMAKE_CURRENT_LIST_DIR}/redsetTargets.cmake")