take into account sysctl deprecation in modern linux kernels

AUTHORS

@@ -0,0 +1,22 @@
+Original Authors:
+
+Balint Joo, Jefferson Lab           email: bjoo AT jab.org
+Dhiraj D. Kalamkar, Intel Parallel Computing Labs, Bangalore, India   email: dhiraj.d.kalamkar AT intel.com
+Karthikeyan Vaidyanathan, Intel Parallel Computing Labs, Bangalore, India  email:  karthikeyan.vaidyanathan AT intel.com
+Mikhail Smelyanskiy, Intel Parallel Computing Labs, Santa Clara, USA   email: mikhail.smelianskiy AT intel.com
+
+Contributors:
+*) Thorsten Kurth (LBL) 
+*) Aaron Walden (ODU) - for integrating the AVX512 output from the code-generator and testing in Intel SDE
+
+*) Mario Schroeck (INFN) (mario.schroeck AT roma3.infn.it) and Alexei Strelchenko (FNAL, astrel AT fnal.gov) - for work on the Twisted Mass Fermion (qphix-tmf) branch
+*) Peter Labus (HISKP Uni Bonn + SISSA) (plabus AT sissa.it) - work on twisted mass and twisted clover operators
+*) Martin Ueding (HISKP Uni Bonn) () - cleanup of codebase and tests, overhaul of QPhiX build system, merge of code generator, 
+   work on twisted, twisted clover, non-degenerate twisted, non-degenerate twisted clover, Hasenbusch-style mass
+   preconditioning for Wilson clover operator
+*) Bartosz Kostrzewa (HISKP, Uni Bonn) (bartosz_kostrzewa AT fastmail.com) - work on twisted, twisted clover,
+   non-degenerate twisted, non-degenerate twisted clover
+
+*) Diptorup Deb, RENCI University of North Carolina Chapel Hill (diptorup AT cs.unc.edu)-is working on portability to other compilers
+
+*) Thanks to Kiran Pamnany, Intel Parallel Computing Labs, Bangalore, India  for the MIC Barrier routine (Barrier_mic.h) email: kiran.pamndany AT intel.com

CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 3.1)
 project(QPhiX)
 include(CTest)
+include(CheckFunctionExists)
+include(CheckIncludeFiles)
 
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_EXTENSIONS OFF)
@@ -31,9 +33,19 @@ option(mpi_comms "Use plain MPI comms instead of QMP in the kernels" ON)
 # Codegen stuff
 set(host_cxx ${CMAKE_CXX_COMPILER} CACHE STRING "select target CXX Compiler for building libqphix-codegen.a" )
 set(host_cxxflags ${CMAKE_CXX_FLAGS} CACHE STRING  "select target CXXFLAGS for building libqphix-codege.a")
-set(recursive_jN '' CACHE STRING "select -j value for recursive make (defaults to 1)")
+set(recursive_jN 1 CACHE STRING "select -j value for recursive make (defaults to 1)")
 option(skip_build "Developer only: Reduce building of certain kernels for faster build" OFF)
 
+###############################################################################
+#                         check system includes                               #
+###############################################################################
+check_function_exists(sysconf QPHIX_HAVE_SYSCONF)
+check_include_files("sys/sysctl.h" QPHIX_HAVE_SYSCTL)
+
+if(NOT DEFINED QPHIX_HAVE_SYSCONF OR NOT DEFINED QPHIX_HAVE_SYSCTL)
+  message(FATAL_ERROR "either sysconf or sys/sysctl.h must be available")
+endif()
+
 ###############################################################################
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/CMakeModules/")

include/qphix/qphix_config_internal.h.in.cmake

@@ -22,6 +22,8 @@
 #cmakedefine QPHIX_SCALAR_SOURCE
 #cmakedefine QPHIX_BUILD_QDPJIT
 #cmakedefine QPHIX_MPI_COMMS_CALLS
+#cmakedefine QPHIX_HAVE_SYSCONF
+#cmakedefine QPHIX_HAVE_SYSCTL
 
 #define QPHIX_LLC_CACHE_ALIGN @QPHIX_LLC_CACHE_ALIGN@
 #endif

include/qphix/tsc.h

@@ -2,7 +2,11 @@
 
 // Stuff for rdtsc
 #include <sys/types.h>
+#ifdef QPHIX_HAVE_SYSCONF
+// no need for any headers
+#elif defined QPHIX_HAVE_SYSCTL
 #include <sys/sysctl.h>
+#endif
 
 typedef long long TSC_tick;
 #define CLOCK_NOW(a) (a) = __rdtsc()