removed multithreaded FFTW, does not make a big time difference and will simplify linking when using PETSc

code/DAMASK_spectral_utilities.f90

@@ -227,11 +227,6 @@ subroutine utilities_init()
 !--------------------------------------------------------------------------------------------------
 ! general initialization of FFTW (see manual on fftw.org for more details)
  if (pReal /= C_DOUBLE .or. pInt /= C_INT) call IO_error(0_pInt,ext_msg='Fortran to C')             ! check for correct precision in C
-!$ if(DAMASK_NumThreadsInt > 0_pInt) then
-!$   i = fftw_init_threads()                                                                        ! returns 0 in case of problem
-!$   if (i == 0_pInt) call IO_error(error_ID = 809_pInt)
-!$   call fftw_plan_with_nthreads(DAMASK_NumThreadsInt) 
-!$ endif
  call fftw_set_timelimit(fftw_timelimit)                                                            ! set timelimit for plan creation
 
 !--------------------------------------------------------------------------------------------------

code/Makefile

@@ -29,7 +29,7 @@ endif
 ifdef PETSC_DIR
 include $(PETSC_DIR)/conf/variables
 INCLUDE_DIRS :=$(PETSC_FC_INCLUDES) -DPETSc -I../lib
-LIBRARIES    :=$(PETSC_WITH_EXTERNAL_LIB) -lfftw3
+LIBRARIES    :=$(PETSC_WITH_EXTERNAL_LIB)
 COMPILERNAME ?= $(FC)
 LINKERNAME   ?= $(FLINKER)
 else
@@ -84,7 +84,7 @@ IMKL_COMPILER_gfortran :=gf
 ifeq "$(OPENMP)" "ON"
 OPENMP_FLAG_ifort =-openmp -openmp-report0 -parallel
 OPENMP_FLAG_gfortran =-fopenmp
-LIBRARIES +=-lfftw3_threads -lpthread
+LIBRARIES +=-lpthread
 ifeq "$(F90)" "ifort"
 LIBRARIES +=-liomp5
 endif