diff --git a/Makefile b/Makefile
index 97732c1..9456ea8 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ src:
 	$(MAKE) -C $@
 
 man:
-	- $(MAKE) -C $@
+	- $(MAKE) -C $@ &> /dev/null
 
 all: src man
 
diff --git a/src/checkpoint.py b/src/checkpoint.py
new file mode 100644
index 0000000..9a8358a
--- /dev/null
+++ b/src/checkpoint.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+#   IRPF90 is a Fortran90 preprocessor written in Python for programming using
+#   the Implicit Reference to Parameters (IRP) method.
+#   Copyright (C) 2009 Anthony SCEMAMA 
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program; if not, write to the Free Software Foundation, Inc.,
+#   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+#   Anthony Scemama
+#   LCPQ - IRSAMC - CNRS
+#   Universite Paul Sabatier
+#   118, route de Narbonne      
+#   31062 Toulouse Cedex 4      
+#   scemama@irsamc.ups-tlse.fr
+
+
+from irpf90_t import *
+from util import *
+from variables import variables
+from modules import modules
+
+CHECKPOINT_UNIT_NUMBER=63
+
+FILENAME=irpdir+'irp_checkpoint.irp.F90'
+
+def create():
+  out_write      = [ "subroutine irp_checkpoint_write" ] 
+  l = variables.keys()
+  l.sort
+  main_modules = filter(lambda x: modules[x].is_main, modules)
+  for m in filter(lambda x: not modules[x].is_main, modules):
+    out_write   += [ "  use %s"%(modules[m].name) ]
+  out_write     += [ "  implicit none" ]
+  out_write     += [ "  integer, parameter :: iunit = %d"%(CHECKPOINT_UNIT_NUMBER) ]
+  out_write     += [ "  open(unit=%d,file='irp_checkpoint.dat',status='UNKNOWN',action='WRITE')"%(CHECKPOINT_UNIT_NUMBER) ]
+  for v in l:
+    var = variables[v]
+    if var.is_main:
+      out_write     += [ "  if (%s_is_built) then"%(v) ]
+      for w in [v]+var.others:
+        d = variables[w].dim
+        if d == []:
+          out_write += [ "    write(iunit,*) '%s', 0"%(w) ]
+        else:
+          out_write += [ "    write(iunit, *) '%s', %d"%(w, len(d)),  
+                        "    write(iunit, *) %s"%(",".join(
+                        [ "size(%s,%d)"%(w,i+1) for i in range(len(d)) ] ))
+                       ]
+        out_write   += [ "    write(iunit,*) %s"%(w) ]
+      out_write     += [ "  endif" ]
+  out_write         += [ "  close(%d)"%(CHECKPOINT_UNIT_NUMBER) ]
+  out_write         += [ "end" ]
+
+  out = '\n'.join(out_write)
+  if not same_file(FILENAME,out):
+    file = open(FILENAME,'w')
+    file.writelines(out)
+    file.close()
+
+if __name__ == '__main__':
+  create()
+
diff --git a/src/command_line.py b/src/command_line.py
index d55515d..59e3185 100644
--- a/src/command_line.py
+++ b/src/command_line.py
@@ -256,6 +256,7 @@ def print_options():
     description = p1.communicate(description)[0]
     description = description.replace('\n','\n'.ljust(27))
     print ("-%s, --%s"%(k,options[k][0])).ljust(25), description+'\n'
+  print "\n"
 
 if __name__ == '__main__':
   print_options()
diff --git a/src/cython_setup.py b/src/cython_setup.py
index ae6b6a3..6bb2e85 100755
--- a/src/cython_setup.py
+++ b/src/cython_setup.py
@@ -29,7 +29,7 @@ from distutils.extension import Extension
 from Cython.Distutils import build_ext
 import os
 
-to_remove = """cython_setup.py command_line.py""".split()
+to_remove = """cython_setup.py version.py command_line.py""".split()
 ext_modules = []
 
 files = os.listdir('.')
diff --git a/src/irp_stack.py b/src/irp_stack.py
index ce238d8..295bfe7 100644
--- a/src/irp_stack.py
+++ b/src/irp_stack.py
@@ -31,6 +31,7 @@ from command_line import command_line
 do_assert = command_line.do_assert
 do_debug = command_line.do_debug
 do_openmp = command_line.do_openmp
+do_memory = command_line.do_memory
 
 import irpf90_t
 
@@ -53,34 +54,45 @@ subroutine irp_enter(irp_where)
  use irp_stack_mod
  integer       :: ithread
  character*(*) :: irp_where
-!$ integer, external :: omp_get_thread_num
-!$ integer, external :: omp_get_num_threads
- ithread = 0
-!$ ithread = omp_get_thread_num()
-$1
 """
-
-  if not command_line.do_openmp:
+  if do_openmp:
     txt += """
+ integer, external :: omp_get_thread_num
+ integer, external :: omp_get_num_threads
+ ithread = omp_get_thread_num()
 if (ithread /= 0) then
    print *, 'Error: Provider is called by thread', ithread
    call irp_trace
    stop 1
 endif
+"""
+  else:
+    txt += """
+ ithread = 0
 """
 
-  if command_line.do_memory:
-      txt+="""
+  txt += "$1"
+
+  if do_memory:
+     txt+="""
  if (.not.alloc) then
- nthread = 1
+"""
+     if do_openmp:
+       txt += """
  !$OMP PARALLEL
  !$OMP SINGLE
- !$ nthread = omp_get_num_threads()
+ nthread = omp_get_num_threads()
  !$OMP END SINGLE
  !$OMP END PARALLEL
-  print *, 'Allocating irp_stack(',STACKMAX,',',nthread,')'
-  print *, 'Allocating irp_cpu(',STACKMAX,',',nthread,')'
-  print *, 'Allocating stack_index(',nthread,')'
+"""
+     else:
+       txt += """
+ nthread = 1
+ """
+     txt += """
+   print *, 'Allocating irp_stack(',STACKMAX,',',nthread,')'
+   print *, 'Allocating irp_cpu(',STACKMAX,',',nthread,')'
+   print *, 'Allocating stack_index(',nthread,')'
  endif"""
   txt +="""
 $2
@@ -90,25 +102,41 @@ subroutine irp_enter_f(irp_where)
  use irp_stack_mod
  integer       :: ithread
  character*(*) :: irp_where
-!$ integer, external :: omp_get_thread_num
-!$ integer, external :: omp_get_num_threads
- ithread = 0
-!$ ithread = omp_get_thread_num()
+ """
+  if do_openmp:
+    txt += """
+ integer, external :: omp_get_thread_num
+ integer, external :: omp_get_num_threads
+ ithread = omp_get_thread_num()
+"""
+  else:
+    txt += """
+  ithread = 0
+"""
+  txt += """
 $1
 """
-  if command_line.do_memory:
-      txt+="""
+  if do_memory:
+    txt+="""
  if (.not.alloc) then
+"""
+    if do_openmp:
+      txt += """
  !$OMP PARALLEL
  !$OMP SINGLE
- !$ nthread = omp_get_num_threads()
+  nthread = omp_get_num_threads()
+ !$OMP END SINGLE
+ !$OMP END PARALLEL
+"""
+    else:
+      txt += """
+  nthread = 1
+"""
+    txt +="""
   print *, 'Allocating irp_stack(',STACKMAX,',',nthread,')'
   print *, 'Allocating irp_cpu(',STACKMAX,',',nthread,')'
   print *, 'Allocating stack_index(',nthread,')'
- !$OMP END SINGLE
- !$OMP END PARALLEL
- endif"""
-  txt +="""
+ endif
 $2
 end subroutine
 
@@ -117,9 +145,17 @@ subroutine irp_leave (irp_where)
   character*(*) :: irp_where
   integer       :: ithread
   double precision :: cpu
-!$ integer, external :: omp_get_thread_num
+"""
+  if do_openmp:
+    txt += """
+ integer, external :: omp_get_thread_num
+ ithread = omp_get_thread_num()
+ """
+  else:
+    txt += """
  ithread = 0
-!$ ithread = omp_get_thread_num()
+ """
+  txt += """
 $3
 $4
 end subroutine
@@ -127,32 +163,49 @@ end subroutine
 
   # $1
   if do_assert or do_debug:
-    txt = txt.replace("$1","""
+    s = """
  if (.not.alloc) then
+ """
+    if do_openmp:
+      s += """
  !$OMP PARALLEL
  !$OMP SINGLE
- !$ nthread = omp_get_num_threads()
+ nthread = omp_get_num_threads()
  !$OMP END SINGLE
  !$OMP END PARALLEL
  !$OMP CRITICAL
  if (.not.alloc) then
-   allocate(irp_stack(0:STACKMAX,nthread+1))
-   allocate(irp_cpu(0:STACKMAX,nthread+1))
-   allocate(stack_index(nthread+1))
+   allocate(irp_stack(0:STACKMAX,nthread))
+   allocate(irp_cpu(0:STACKMAX,nthread))
+   allocate(stack_index(nthread))
    stack_index = 0
    alloc = .True.
  endif
  !$OMP END CRITICAL
  endif
  stack_index(ithread+1) = mod(stack_index(ithread+1)+1,STACKMAX)
- irp_stack(stack_index(ithread+1),ithread+1) = irp_where""")
-    if command_line.do_memory:
+ irp_stack(stack_index(ithread+1),ithread+1) = irp_where"""
+    else:
+      s += """
+ nthread = 1
+ if (.not.alloc) then
+   allocate(irp_stack(0:STACKMAX,1))
+   allocate(irp_cpu(0:STACKMAX,1))
+   allocate(stack_index(2))
+   stack_index = 0
+   alloc = .True.
+ endif
+ endif
+ stack_index(1) = mod(stack_index(1)+1,STACKMAX)
+ irp_stack(stack_index(1),1) = irp_where"""
+    if do_memory:
       txt+="""
   print *, 'Allocating irp_stack(',STACKMAX,','nthread,')'
   print *, 'Allocating irp_cpu(',STACKMAX,','nthread,')'
   print *, 'Allocating stack_index(',nthread,')'"""
   else:
-    txt = txt.replace("$1","")
+    s = ""
+  txt = txt.replace("$1",s)
 
   # $2
   if do_debug:
@@ -184,9 +237,17 @@ subroutine irp_trace
  use irp_stack_mod
  integer :: ithread
  integer :: i
+"""
+  if do_openmp:
+    txt += """
 !$ integer, external :: omp_get_thread_num
- ithread = 0
 !$ ithread = omp_get_thread_num()
+"""
+  else:
+    txt += """
+ ithread = 0
+"""
+  txt += """
  if (.not.alloc) return
  print *, 'Stack trace: ', ithread
  print *, '-------------------------'
diff --git a/src/irpf90.py b/src/irpf90.py
index 528289c..ada860f 100644
--- a/src/irpf90.py
+++ b/src/irpf90.py
@@ -100,6 +100,9 @@ def main():
   import touches
   touches.create()
 
+  import checkpoint
+  checkpoint.create()
+
   import create_man
   create_man.run()
 
diff --git a/src/makefile.py b/src/makefile.py
index cfc55e8..d1ce7eb 100644
--- a/src/makefile.py
+++ b/src/makefile.py
@@ -91,6 +91,7 @@ def run():
     result += "\n"
     result += "SRC += %sirp_stack.irp.F90"%(irpdir)
     result += " %sirp_touches.irp.F90"%(irpdir)
+    result += " %sirp_checkpoint.irp.F90"%(irpdir)
     if command_line.do_openmp:
       result += " %sirp_locks.irp.F90"%(irpdir)
     if command_line.do_profile:
@@ -107,7 +108,7 @@ def run():
         result += " %s%s.irp.module.o"%(irpdir,m.filename)
     print >>file, result
 
-    print >>file, "OBJ1 = $(OBJ_IRP) $(OBJ) %sirp_touches.irp.o"%(irpdir),
+    print >>file, "OBJ1 = $(OBJ_IRP) $(OBJ) %sirp_touches.irp.o %sirp_checkpoint.irp.o"%(irpdir,irpdir),
     if command_line.do_profile:
       print >>file, " %sirp_profile.irp.o"%(irpdir), " irp_rdtsc.o",
     if command_line.do_codelet:
@@ -150,7 +151,7 @@ def run():
       print >>file, filename," ".join(mds)," ".join(m.includes)
       if not m.is_main:
         buffer += "\t - @echo '"+filename+" ".join(mds)+"' >> %sdist_Makefile\n"%(irpdir)
-    print >>file, "%sirp_touches.irp.o: $(OBJ) "%(irpdir),
+    print >>file, "%sirp_touches.irp.o %sirp_checkpoint.irp.o: $(OBJ) "%(irpdir,irpdir),
     mds = filter(lambda x: not x.is_main,mod)
     mds = map(lambda x: " %s%s.irp.o %s%s.irp.o"%(irpdir,x.filename,irpdir,x.filename),mds)
     print >>file," ".join(mds)
@@ -162,33 +163,6 @@ def run():
       print >>file," ".join(mds)
     
 
-#   print >>file, "%sdist_Makefile:"%(irpdir)
-#   print >>file, "\t- @echo FC=$(FC) > %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo FCFLAGS=$(FCFLAGS) >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo LIB=$(LIB) >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo .DEFAULT_GOAL: exe >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo 'exe: $$(EXE).irp.F90 $(OBJ_IRP) $(OBJ) irp_touches.irp.o'  >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo '\t$$(FC) -o $$(EXE) $$(EXE).irp.F90 $(OBJ_IRP) $(OBJ) irp_touches.irp.o $$(LIB)' >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo '%%.o: %%.F90'  >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo '\t$$(FC) $$(FCFLAGS) -c $$*.F90 -o $$*.o' >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo 'clean:' >> %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @echo '\trm *.o *.mod $$(EXE) 2>/dev/null' >> %sdist_Makefile"%(irpdir)
-#   print >>file, buffer
-#   print >>file, "\t- @echo '\tirp_touches.irp.o: irp_touches.irp.F90 $(OBJ_IRP) $(OBJ) >> %sdist_Makefile"%(irpdir)
-
-#   print >>file, "%%.dist: %sdist_Makefile"%(irpdir)
-#   print >>file, "\t- @mkdir -p dist/$*| DO_NOTHING="
-#   print >>file, "\t- @cp %s* dist/$*/| DO_NOTHING="%(irpdir)
-#   print >>file, "\t- @for i in $(ALL) $(OBJ) irp_touches.irp.o $(ALL_OBJ); do rm dist/$*/$$i ; done| DO_NOTHING="
-#   print >>file, "\t- @for i in $(ALL) ; do rm dist/$*/$$i.irp.F90 ; done| DO_NOTHING="
-#   print >>file, "\t- @rm dist/$*/{*.irp.f,*.mod,irpf90_entities}| DO_NOTHING="
-#   print >>file, "\t- @rm dist/$*/*.mod 2>/dev/null| DO_NOTHING="
-#   print >>file, "\t- @echo 'EXE = $*' > dist/$*/Makefile| DO_NOTHING="
-#   print >>file, "\t- @cat dist/$*/dist_Makefile >> dist/$*/Makefile| DO_NOTHING="
-#   print >>file, "\t- @rm dist/$*/dist_Makefile| DO_NOTHING="
-#   print >>file, "\t- @cp %s$*.irp.F90 dist/$*/| DO_NOTHING="%(irpdir)
-#   print >>file, "\t- cd dist ; tar -zcvf ../$*.tar.gz $*\n"
-
     for dir in [ irpdir ] + map(lambda x: irpdir+x, command_line.include_dir):
       print >>file, dir+"%.irp.module.o: $(OBJ) "+dir+"%.irp.module.F90"
       print >>file, "\t$(FC) $(FCFLAGS) -c "+dir+"$*.irp.module.F90 -o "+dir+"$*.irp.module.o"
diff --git a/src/preprocessed_text.py b/src/preprocessed_text.py
index b7a4bf8..ec7575a 100644
--- a/src/preprocessed_text.py
+++ b/src/preprocessed_text.py
@@ -522,6 +522,8 @@ def irp_simple_statements(text):
   def process_assert(line):
     assert type(line) == Assert
     if command_line.do_assert:
+      if '(' not in line.text or ')' not in line.text:
+         error.fail(line,"Syntax error in ASSERT statement (parentheses)")
       condition = "(%s"%(line.text.split('(',1)[1])
       if condition == "":
         error.fail(line,"Error in Assert statement")
diff --git a/src/profile.py b/src/profile.py
index 9f66708..7ff7fe4 100644
--- a/src/profile.py
+++ b/src/profile.py
@@ -136,8 +136,8 @@ subroutine irp_print_timer()
  call profile_sort()
  print '(A24,A8,A17,A20,A13,A20)', '', 'N.Calls', 'Tot Cycles', 'Avg Cycles', &
                           'Tot Secs', 'Avg Secs'
-   print '(A)', '----------------------------------------------'// &
-                '----------------------------------------------'
+   print '(A)', '---------------------------------------------------'// &
+                '---------------------------------------------------'
  do ii=1,%(n)d
   i = irp_order(ii)
   if (irp_profile(3,i) > 0.) then
diff --git a/src/util.py b/src/util.py
index 0c81577..b03a50b 100644
--- a/src/util.py
+++ b/src/util.py
@@ -110,9 +110,9 @@ def dimsize(x):
       if b0.replace('-','').isdigit():
         size = "%s - (%d)"%(b1,int(b0)-1)
       elif b1.replace('-','').isdigit():
-        size = "%d - %s"%(int(b1)+1,b0)
+        size = "%d - (%s)"%(int(b1)+1,b0)
       else:
-        size = "%s - %s + 1"%(b1,b0)
+        size = "%s - (%s) + 1"%(b1,b0)
     return size
 
 def put_info(text,filename):
diff --git a/src/variable.py b/src/variable.py
index bf462b2..56a61a8 100644
--- a/src/variable.py
+++ b/src/variable.py
@@ -464,17 +464,6 @@ class Variable(object):
       name = self.name
       same_as = self.same_as
 
-      def check_openmp():
-        if not command_line.do_openmp:
-          result =  [ "!$ nthreads = omp_get_num_threads()" ,
-                      "!$ if (nthreads > 1) then" ,
-                      "!$   print *, irp_here//': Error: Provider in an openMP section'" ,
-                      "!$   stop 1",
-                      "!$ endif" ]
-        else:
-          result = []
-        return result
-
       def build_alloc(name):
         self = variables[name]
         if self.dim == []:
@@ -547,7 +536,8 @@ class Variable(object):
         result += [ "!DEC$ ATTRIBUTES FORCEINLINE :: provide_%s"%(name) ]
       result += [ "subroutine provide_%s"%(name) ] 
       result += build_use( [same_as]+self.to_provide )
-      result += ["!$ use omp_lib"]
+      if command_line.do_openmp:
+        result += [" use omp_lib"]
       result.append("  implicit none")
       length = len("provide_%s"%(name))
       result += [\
@@ -557,8 +547,6 @@ class Variable(object):
       "!$ integer                  :: nthreads"]
       if command_line.do_openmp:
         result.append(" call irp_lock_%s(.True.)"%(same_as))
-      else:
-        result += check_openmp()
       if command_line.do_assert or command_line.do_debug:
         result.append("  call irp_enter(irp_here)")
       result += call_provides(self.to_provide)
diff --git a/src/version.py b/src/version.py
index e3a0f01..38ec8ed 100644
--- a/src/version.py
+++ b/src/version.py
@@ -1 +1 @@
-version = "1.5.0"
+version = "1.6.0"