Add -Wshadow to the gcc command line options used when compiling the binutils.

Fix up all warnings generated by the addition of this switch.

7 files changed, 171 insertions, 172 deletions

diff --git a/gprof/ChangeLog b/gprof/ChangeLog
index e9ae218..acc8697 100644
--- a/gprof/ChangeLog
+++ b/gprof/ChangeLog
@@ -1,3 +1,12 @@
+2009-12-11  Nick Clifton  <nickc@redhat.com>
+
+	* Makefile.in: Regenerate.
+	* cg_arcs.c: Fix shadowed variable warnings.
+	* cg_dfn.c: Likewise.
+	* cg_print.c: Likewise.
+	* configure: Likewise.
+	* hist.c: Likewise.
+
 2009-11-30  Joseph Myers  <joseph@codesourcery.com>
 
 	* configure: Regenerate.
diff --git a/gprof/Makefile.in b/gprof/Makefile.in
index c67e913..291c018 100644
--- a/gprof/Makefile.in
+++ b/gprof/Makefile.in
@@ -47,9 +47,11 @@ ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../bfd/warning.m4 \
 	$(top_srcdir)/../config/depstand.m4 \
 	$(top_srcdir)/../config/gettext-sister.m4 \
+	$(top_srcdir)/../config/largefile.m4 \
 	$(top_srcdir)/../config/lead-dot.m4 \
 	$(top_srcdir)/../config/nls.m4 \
 	$(top_srcdir)/../config/override.m4 \
+	$(top_srcdir)/../config/plugins.m4 \
 	$(top_srcdir)/../config/po.m4 \
 	$(top_srcdir)/../config/progtest.m4 \
 	$(top_srcdir)/../libtool.m4 $(top_srcdir)/../ltoptions.m4 \
diff --git a/gprof/cg_arcs.c b/gprof/cg_arcs.c
index 10f3f97..1fa619d 100644
--- a/gprof/cg_arcs.c
+++ b/gprof/cg_arcs.c
@@ -437,13 +437,13 @@ inherit_flags (Sym *child)
 static void
 propagate_flags (Sym **symbols)
 {
-  int index;
+  int sym_index;
   Sym *old_head, *child;
 
   old_head = 0;
-  for (index = symtab.len - 1; index >= 0; --index)
+  for (sym_index = symtab.len - 1; sym_index >= 0; --sym_index)
     {
-      child = symbols[index];
+      child = symbols[sym_index];
       /*
        * If we haven't done this function or cycle, inherit things
        * from parent.  This way, we are linear in the number of arcs
@@ -587,23 +587,20 @@ cmp_total (const PTR lp, const PTR rp)
 }
 
 
-/*
- * Topologically sort the graph (collapsing cycles), and propagates
- * time bottom up and flags top down.
- */
+/* Topologically sort the graph (collapsing cycles), and propagates
+   time bottom up and flags top down.  */
+
 Sym **
-cg_assemble ()
+cg_assemble (void)
 {
   Sym *parent, **time_sorted_syms, **top_sorted_syms;
-  unsigned int index;
+  unsigned int sym_index;
   Arc *arc;
 
-  /*
-   * initialize various things:
-   *      zero out child times.
-   *      count self-recursive calls.
-   *      indicate that nothing is on cycles.
-   */
+  /* Initialize various things:
+       Zero out child times.
+       Count self-recursive calls.
+       Indicate that nothing is on cycles.  */
   for (parent = symtab.base; parent < symtab.limit; parent++)
     {
       parent->cg.child_time = 0.0;
@@ -626,80 +623,65 @@ cg_assemble ()
       parent->cg.cyc.head = parent;
       parent->cg.cyc.next = 0;
       if (ignore_direct_calls)
-	{
-	  find_call (parent, parent->addr, (parent + 1)->addr);
-	}
+	find_call (parent, parent->addr, (parent + 1)->addr);
     }
-  /*
-   * Topologically order things.  If any node is unnumbered, number
-   * it and any of its descendents.
-   */
+
+  /* Topologically order things.  If any node is unnumbered, number
+     it and any of its descendents.  */
   for (parent = symtab.base; parent < symtab.limit; parent++)
     {
       if (parent->cg.top_order == DFN_NAN)
-	{
-	  cg_dfn (parent);
-	}
+	cg_dfn (parent);
     }
 
-  /* link together nodes on the same cycle: */
+  /* Link together nodes on the same cycle.  */
   cycle_link ();
 
-  /* sort the symbol table in reverse topological order: */
+  /* Sort the symbol table in reverse topological order.  */
   top_sorted_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
-  for (index = 0; index < symtab.len; ++index)
-    {
-      top_sorted_syms[index] = &symtab.base[index];
-    }
+  for (sym_index = 0; sym_index < symtab.len; ++sym_index)
+    top_sorted_syms[sym_index] = &symtab.base[sym_index];
+
   qsort (top_sorted_syms, symtab.len, sizeof (Sym *), cmp_topo);
   DBG (DFNDEBUG,
        printf ("[cg_assemble] topological sort listing\n");
-       for (index = 0; index < symtab.len; ++index)
-       {
-       printf ("[cg_assemble] ");
-       printf ("%d:", top_sorted_syms[index]->cg.top_order);
-       print_name (top_sorted_syms[index]);
-       printf ("\n");
-       }
+       for (sym_index = 0; sym_index < symtab.len; ++sym_index)
+	 {
+	   printf ("[cg_assemble] ");
+	   printf ("%d:", top_sorted_syms[sym_index]->cg.top_order);
+	   print_name (top_sorted_syms[sym_index]);
+	   printf ("\n");
+	 }
   );
-  /*
-   * Starting from the topological top, propagate print flags to
-   * children.  also, calculate propagation fractions.  this happens
-   * before time propagation since time propagation uses the
-   * fractions.
-   */
+
+  /* Starting from the topological top, propagate print flags to
+     children.  also, calculate propagation fractions.  this happens
+     before time propagation since time propagation uses the
+     fractions.  */
   propagate_flags (top_sorted_syms);
 
-  /*
-   * Starting from the topological bottom, propogate children times
-   * up to parents.
-   */
+  /* Starting from the topological bottom, propogate children times
+     up to parents.  */
   cycle_time ();
-  for (index = 0; index < symtab.len; ++index)
-    {
-      propagate_time (top_sorted_syms[index]);
-    }
+  for (sym_index = 0; sym_index < symtab.len; ++sym_index)
+    propagate_time (top_sorted_syms[sym_index]);
 
   free (top_sorted_syms);
 
-  /*
-   * Now, sort by CG.PROP.SELF + CG.PROP.CHILD.  Sorting both the regular
-   * function names and cycle headers.
-   */
+  /* Now, sort by CG.PROP.SELF + CG.PROP.CHILD.  Sorting both the regular
+     function names and cycle headers.  */
   time_sorted_syms = (Sym **) xmalloc ((symtab.len + num_cycles) * sizeof (Sym *));
-  for (index = 0; index < symtab.len; index++)
-    {
-      time_sorted_syms[index] = &symtab.base[index];
-    }
-  for (index = 1; index <= num_cycles; index++)
-    {
-      time_sorted_syms[symtab.len + index - 1] = &cycle_header[index];
-    }
+  for (sym_index = 0; sym_index < symtab.len; sym_index++)
+    time_sorted_syms[sym_index] = &symtab.base[sym_index];
+
+  for (sym_index = 1; sym_index <= num_cycles; sym_index++)
+    time_sorted_syms[symtab.len + sym_index - 1] = &cycle_header[sym_index];
+
   qsort (time_sorted_syms, symtab.len + num_cycles, sizeof (Sym *),
 	 cmp_total);
-  for (index = 0; index < symtab.len + num_cycles; index++)
-    {
-      time_sorted_syms[index]->cg.index = index + 1;
-    }
+
+  for (sym_index = 0; sym_index < symtab.len + num_cycles; sym_index++)
+    time_sorted_syms[sym_index]->cg.index = sym_index + 1;
+
   return time_sorted_syms;
 }
diff --git a/gprof/cg_dfn.c b/gprof/cg_dfn.c
index 6ded556..1da4c66 100644
--- a/gprof/cg_dfn.c
+++ b/gprof/cg_dfn.c
@@ -92,7 +92,7 @@ find_cycle (Sym *child)
   Sym *head = 0;
   Sym *tail;
   int cycle_top;
-  int index;
+  int cycle_index;
 
   for (cycle_top = dfn_depth; cycle_top > 0; --cycle_top)
     {
@@ -169,9 +169,9 @@ find_cycle (Sym *child)
 	       print_name (head);
 	       printf ("\n"));
 	}
-      for (index = cycle_top + 1; index <= dfn_depth; ++index)
+      for (cycle_index = cycle_top + 1; cycle_index <= dfn_depth; ++cycle_index)
 	{
-	  child = dfn_stack[index].sym;
+	  child = dfn_stack[cycle_index].sym;
 	  if (child->cg.cyc.head == child)
 	    {
 	      /*
diff --git a/gprof/cg_print.c b/gprof/cg_print.c
index 0b2e989..c1cb400 100644
--- a/gprof/cg_print.c
+++ b/gprof/cg_print.c
@@ -499,7 +499,7 @@ print_line (Sym *np)
 void
 cg_print (Sym ** timesortsym)
 {
-  unsigned int index;
+  unsigned int sym_index;
   Sym *parent;
 
   if (print_descriptions && bsd_style_output)
@@ -507,9 +507,9 @@ cg_print (Sym ** timesortsym)
 
   print_header ();
 
-  for (index = 0; index < symtab.len + num_cycles; ++index)
+  for (sym_index = 0; sym_index < symtab.len + num_cycles; ++sym_index)
     {
-      parent = timesortsym[index];
+      parent = timesortsym[sym_index];
 
       if ((ignore_zeros && parent->ncalls == 0
 	   && parent->cg.self_calls == 0 && parent->cg.prop.self == 0
@@ -560,7 +560,7 @@ cmp_name (const PTR left, const PTR right)
 void
 cg_print_index ()
 {
-  unsigned int index;
+  unsigned int sym_index;
   unsigned int nnames, todo, i, j;
   int col, starting_col;
   Sym **name_sorted_syms, *sym;
@@ -572,30 +572,30 @@ cg_print_index ()
      alphabetically to create an index.  */
   name_sorted_syms = (Sym **) xmalloc ((symtab.len + num_cycles) * sizeof (Sym *));
 
-  for (index = 0, nnames = 0; index < symtab.len; index++)
+  for (sym_index = 0, nnames = 0; sym_index < symtab.len; sym_index++)
     {
-      if (ignore_zeros && symtab.base[index].ncalls == 0
-	  && symtab.base[index].hist.time == 0)
+      if (ignore_zeros && symtab.base[sym_index].ncalls == 0
+	  && symtab.base[sym_index].hist.time == 0)
 	continue;
 
-      name_sorted_syms[nnames++] = &symtab.base[index];
+      name_sorted_syms[nnames++] = &symtab.base[sym_index];
     }
 
   qsort (name_sorted_syms, nnames, sizeof (Sym *), cmp_name);
 
-  for (index = 1, todo = nnames; index <= num_cycles; index++)
-    name_sorted_syms[todo++] = &cycle_header[index];
+  for (sym_index = 1, todo = nnames; sym_index <= num_cycles; sym_index++)
+    name_sorted_syms[todo++] = &cycle_header[sym_index];
 
   printf ("\f\n");
   printf (_("Index by function name\n\n"));
-  index = (todo + 2) / 3;
+  sym_index = (todo + 2) / 3;
 
-  for (i = 0; i < index; i++)
+  for (i = 0; i < sym_index; i++)
     {
       col = 0;
       starting_col = 0;
 
-      for (j = i; j < todo; j += index)
+      for (j = i; j < todo; j += sym_index)
 	{
 	  sym = name_sorted_syms[j];
 
@@ -771,9 +771,11 @@ cmp_fun_nuses (const PTR left, const PTR right)
 	of function ordering).  */
 
 void
-cg_print_function_ordering ()
+cg_print_function_ordering (void)
 {
-  unsigned long index, used, unused, scratch_index;
+  unsigned long sym_index;
+  unsigned long arc_index;
+  unsigned long used, unused, scratch_index;
   unsigned long  unplaced_arc_count, high_arc_count, scratch_arc_count;
 #ifdef __GNUC__
   unsigned long long total_arcs, tmp_arcs_count;
@@ -783,7 +785,7 @@ cg_print_function_ordering ()
   Sym **unused_syms, **used_syms, **scratch_syms;
   Arc **unplaced_arcs, **high_arcs, **scratch_arcs;
 
-  index = 0;
+  sym_index = 0;
   used = 0;
   unused = 0;
   scratch_index = 0;
@@ -801,20 +803,20 @@ cg_print_function_ordering ()
 
   /* Walk through all the functions; mark those which are never
      called as placed (we'll emit them as a group later).  */
-  for (index = 0, used = 0, unused = 0; index < symtab.len; index++)
+  for (sym_index = 0, used = 0, unused = 0; sym_index < symtab.len; sym_index++)
     {
-      if (symtab.base[index].ncalls == 0)
+      if (symtab.base[sym_index].ncalls == 0)
 	{
-	  unused_syms[unused++] = &symtab.base[index];
-	  symtab.base[index].has_been_placed = 1;
+	  unused_syms[unused++] = &symtab.base[sym_index];
+	  symtab.base[sym_index].has_been_placed = 1;
 	}
       else
 	{
-	  used_syms[used++] = &symtab.base[index];
-	  symtab.base[index].has_been_placed = 0;
-	  symtab.base[index].next = 0;
-	  symtab.base[index].prev = 0;
-	  symtab.base[index].nuses = 0;
+	  used_syms[used++] = &symtab.base[sym_index];
+	  symtab.base[sym_index].has_been_placed = 0;
+	  symtab.base[sym_index].next = 0;
+	  symtab.base[sym_index].prev = 0;
+	  symtab.base[sym_index].nuses = 0;
 	}
     }
 
@@ -827,26 +829,26 @@ cg_print_function_ordering ()
      Overflow is much less likely when this file is compiled
      with GCC as it can double-wide integers via long long.  */
   total_arcs = 0;
-  for (index = 0; index < numarcs; index++)
+  for (arc_index = 0; arc_index < numarcs; arc_index++)
     {
-      total_arcs += arcs[index]->count;
-      arcs[index]->has_been_placed = 0;
+      total_arcs += arcs[arc_index]->count;
+      arcs[arc_index]->has_been_placed = 0;
     }
 
   /* We want to pull out those functions which are referenced
      by many highly used arcs and emit them as a group.  This
      could probably use some tuning.  */
   tmp_arcs_count = 0;
-  for (index = 0; index < numarcs; index++)
+  for (arc_index = 0; arc_index < numarcs; arc_index++)
     {
-      tmp_arcs_count += arcs[index]->count;
+      tmp_arcs_count += arcs[arc_index]->count;
 
       /* Count how many times each parent and child are used up
 	 to our threshhold of arcs (90%).  */
       if ((double)tmp_arcs_count / (double)total_arcs > 0.90)
 	break;
 
-      arcs[index]->child->nuses++;
+      arcs[arc_index]->child->nuses++;
     }
 
   /* Now sort a temporary symbol table based on the number of
@@ -856,9 +858,9 @@ cg_print_function_ordering ()
 
   /* Now pick out those symbols we're going to emit as
      a group.  We take up to 1.25% of the used symbols.  */
-  for (index = 0; index < used / 80; index++)
+  for (sym_index = 0; sym_index < used / 80; sym_index++)
     {
-      Sym *sym = scratch_syms[index];
+      Sym *sym = scratch_syms[sym_index];
       Arc *arc;
 
       /* If we hit symbols that aren't used from many call sites,
@@ -897,7 +899,7 @@ cg_print_function_ordering ()
 	}
 
       /* Keep track of how many symbols we're going to place.  */
-      scratch_index = index;
+      scratch_index = sym_index;
 
       /* A lie, but it makes identifying
 	 these functions easier later.  */
@@ -906,16 +908,16 @@ cg_print_function_ordering ()
 
   /* Now walk through the temporary arcs and copy
      those we care about into the high arcs array.  */
-  for (index = 0; index < scratch_arc_count; index++)
+  for (arc_index = 0; arc_index < scratch_arc_count; arc_index++)
     {
-      Arc *arc = scratch_arcs[index];
+      Arc *arc = scratch_arcs[arc_index];
 
       /* If this arc refers to highly used functions, then
 	 then we want to keep it.  */
       if (arc->child->has_been_placed
 	  && arc->parent->has_been_placed)
 	{
-	  high_arcs[high_arc_count++] = scratch_arcs[index];
+	  high_arcs[high_arc_count++] = scratch_arcs[arc_index];
 
 	  /* We need to turn of has_been_placed since we're going to
 	     use the main arc placement algorithm on these arcs.  */
@@ -926,10 +928,10 @@ cg_print_function_ordering ()
 
   /* Dump the multi-site high usage functions which are not
      going to be ordered by the main ordering algorithm.  */
-  for (index = 0; index < scratch_index; index++)
+  for (sym_index = 0; sym_index < scratch_index; sym_index++)
     {
-      if (scratch_syms[index]->has_been_placed)
-	printf ("%s\n", scratch_syms[index]->name);
+      if (scratch_syms[sym_index]->has_been_placed)
+	printf ("%s\n", scratch_syms[sym_index]->name);
     }
 
   /* Now we can order the multi-site high use
@@ -948,13 +950,13 @@ cg_print_function_ordering ()
 				    scratch_arcs, &scratch_arc_count);
 
   /* Output any functions not emitted by the order_and_dump calls.  */
-  for (index = 0; index < used; index++)
-    if (used_syms[index]->has_been_placed == 0)
-      printf("%s\n", used_syms[index]->name);
+  for (sym_index = 0; sym_index < used; sym_index++)
+    if (used_syms[sym_index]->has_been_placed == 0)
+      printf("%s\n", used_syms[sym_index]->name);
 
   /* Output the unused functions.  */
-  for (index = 0; index < unused; index++)
-    printf("%s\n", unused_syms[index]->name);
+  for (sym_index = 0; sym_index < unused; sym_index++)
+    printf("%s\n", unused_syms[sym_index]->name);
 
   unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
   used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
@@ -992,7 +994,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 #else
   unsigned long tmp_arcs, total_arcs;
 #endif
-  unsigned int index;
+  unsigned int arc_index;
 
   /* If needed, compute the total arc count.
 
@@ -1000,27 +1002,27 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
   if (! all)
     {
       total_arcs = 0;
-      for (index = 0; index < arc_count; index++)
-	total_arcs += the_arcs[index]->count;
+      for (arc_index = 0; arc_index < arc_count; arc_index++)
+	total_arcs += the_arcs[arc_index]->count;
     }
   else
     total_arcs = 0;
 
   tmp_arcs = 0;
 
-  for (index = 0; index < arc_count; index++)
+  for (arc_index = 0; arc_index < arc_count; arc_index++)
     {
       Sym *sym1, *sym2;
       Sym *child, *parent;
 
-      tmp_arcs += the_arcs[index]->count;
+      tmp_arcs += the_arcs[arc_index]->count;
 
       /* Ignore this arc if it's already been placed.  */
-      if (the_arcs[index]->has_been_placed)
+      if (the_arcs[arc_index]->has_been_placed)
 	continue;
 
-      child = the_arcs[index]->child;
-      parent = the_arcs[index]->parent;
+      child = the_arcs[arc_index]->child;
+      parent = the_arcs[arc_index]->parent;
 
       /* If we're not using all arcs, and this is a rarely used
 	 arc, then put it on the unplaced_arc list.  Similarly
@@ -1028,7 +1030,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
       if ((! all && (double)tmp_arcs / (double)total_arcs > MOST)
 	  || child->has_been_placed || parent->has_been_placed)
 	{
-	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[index];
+	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index];
 	  continue;
 	}
 
@@ -1038,7 +1040,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 	 algorithm can use it to place function chains.  */
       if (parent->next && parent->prev && child->next && child->prev)
 	{
-	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[index];
+	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index];
 	  continue;
 	}
 
@@ -1093,7 +1095,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 	{
 	  /* Couldn't find anywhere to attach the functions,
 	     put the arc on the unplaced arc list.  */
-	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[index];
+	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index];
 	  continue;
 	}
 
@@ -1118,7 +1120,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 	  && sym2 == parent)
 	{
 	  /* This would tie two ends together.  */
-	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[index];
+	  unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index];
 	  continue;
 	}
 
@@ -1130,7 +1132,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 	      /* parent-prev and child-next */
 	      parent->prev = child;
 	      child->next = parent;
-	      the_arcs[index]->has_been_placed = 1;
+	      the_arcs[arc_index]->has_been_placed = 1;
 	    }
 	}
       else if (parent->prev)
@@ -1141,7 +1143,7 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 	      /* parent-next and child-prev */
 	      parent->next = child;
 	      child->prev = parent;
-	      the_arcs[index]->has_been_placed = 1;
+	      the_arcs[arc_index]->has_been_placed = 1;
 	    }
 	}
       else
@@ -1153,27 +1155,27 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
 	      /* parent-prev and child-next.  */
 	      parent->prev = child;
 	      child->next = parent;
-	      the_arcs[index]->has_been_placed = 1;
+	      the_arcs[arc_index]->has_been_placed = 1;
 	    }
 	  else
 	    {
 	      /* parent-next and child-prev.  */
 	      parent->next = child;
 	      child->prev = parent;
-	      the_arcs[index]->has_been_placed = 1;
+	      the_arcs[arc_index]->has_been_placed = 1;
 	    }
 	}
     }
 
   /* Dump the chains of functions we've made.  */
-  for (index = 0; index < arc_count; index++)
+  for (arc_index = 0; arc_index < arc_count; arc_index++)
     {
       Sym *sym;
-      if (the_arcs[index]->parent->has_been_placed
-	  || the_arcs[index]->child->has_been_placed)
+      if (the_arcs[arc_index]->parent->has_been_placed
+	  || the_arcs[arc_index]->child->has_been_placed)
 	continue;
 
-      sym = the_arcs[index]->parent;
+      sym = the_arcs[arc_index]->parent;
 
       /* If this symbol isn't attached to any other
 	 symbols, then we've got a rarely used arc.
@@ -1199,14 +1201,14 @@ order_and_dump_functions_by_arcs (the_arcs, arc_count, all,
   /* If we want to place all the arcs, then output
      those which weren't placed by the main algorithm.  */
   if (all)
-    for (index = 0; index < arc_count; index++)
+    for (arc_index = 0; arc_index < arc_count; arc_index++)
       {
 	Sym *sym;
-	if (the_arcs[index]->parent->has_been_placed
-	    || the_arcs[index]->child->has_been_placed)
+	if (the_arcs[arc_index]->parent->has_been_placed
+	    || the_arcs[arc_index]->child->has_been_placed)
 	  continue;
 
-	sym = the_arcs[index]->parent;
+	sym = the_arcs[arc_index]->parent;
 
 	sym->has_been_placed = 1;
 	printf ("%s\n", sym->name);
@@ -1230,42 +1232,44 @@ cmp_symbol_map (const void * l, const void * r)
 void
 cg_print_file_ordering (void)
 {
-  unsigned long scratch_arc_count, index;
+  unsigned long scratch_arc_count;
+  unsigned long arc_index;
+  unsigned long sym_index;
   Arc **scratch_arcs;
   char *last;
 
   scratch_arc_count = 0;
 
   scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
-  for (index = 0; index < numarcs; index++)
+  for (arc_index = 0; arc_index < numarcs; arc_index++)
     {
-      if (! arcs[index]->parent->mapped
-	  || ! arcs[index]->child->mapped)
-	arcs[index]->has_been_placed = 1;
+      if (! arcs[arc_index]->parent->mapped
+	  || ! arcs[arc_index]->child->mapped)
+	arcs[arc_index]->has_been_placed = 1;
     }
 
   order_and_dump_functions_by_arcs (arcs, numarcs, 0,
 				    scratch_arcs, &scratch_arc_count);
 
   /* Output .o's not handled by the main placement algorithm.  */
-  for (index = 0; index < symtab.len; index++)
+  for (sym_index = 0; sym_index < symtab.len; sym_index++)
     {
-      if (symtab.base[index].mapped
-	  && ! symtab.base[index].has_been_placed)
-	printf ("%s\n", symtab.base[index].name);
+      if (symtab.base[sym_index].mapped
+	  && ! symtab.base[sym_index].has_been_placed)
+	printf ("%s\n", symtab.base[sym_index].name);
     }
 
   qsort (symbol_map, symbol_map_count, sizeof (struct function_map), cmp_symbol_map);
 
   /* Now output any .o's that didn't have any text symbols.  */
   last = NULL;
-  for (index = 0; index < symbol_map_count; index++)
+  for (sym_index = 0; sym_index < symbol_map_count; sym_index++)
     {
       unsigned int index2;
 
       /* Don't bother searching if this symbol
 	 is the same as the previous one.  */
-      if (last && !strcmp (last, symbol_map[index].file_name))
+      if (last && !strcmp (last, symbol_map[sym_index].file_name))
 	continue;
 
       for (index2 = 0; index2 < symtab.len; index2++)
@@ -1273,14 +1277,14 @@ cg_print_file_ordering (void)
 	  if (! symtab.base[index2].mapped)
 	    continue;
 
-	  if (!strcmp (symtab.base[index2].name, symbol_map[index].file_name))
+	  if (!strcmp (symtab.base[index2].name, symbol_map[sym_index].file_name))
 	    break;
 	}
 
       /* If we didn't find it in the symbol table, then it must
 	 be a .o with no text symbols.  Output it last.  */
       if (index2 == symtab.len)
-	printf ("%s\n", symbol_map[index].file_name);
-      last = symbol_map[index].file_name;
+	printf ("%s\n", symbol_map[sym_index].file_name);
+      last = symbol_map[sym_index].file_name;
     }
 }
diff --git a/gprof/configure b/gprof/configure
index f45fa42..60b2d18 100755
--- a/gprof/configure
+++ b/gprof/configure
@@ -11883,7 +11883,7 @@ fi
 
 
 
-GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
+GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow"
 
 # Check whether --enable-werror was given.
 if test "${enable_werror+set}" = set; then :
diff --git a/gprof/hist.c b/gprof/hist.c
index 6f4ead8..25364b2 100644
--- a/gprof/hist.c
+++ b/gprof/hist.c
@@ -366,7 +366,7 @@ hist_assign_samples_1 (histogram *r)
   bfd_vma overlap, addr;
   unsigned int bin_count;
   unsigned int i, j;
-  double time, credit;
+  double count_time, credit;
 
   bfd_vma lowpc = r->lowpc / sizeof (UNIT);
 
@@ -379,7 +379,7 @@ hist_assign_samples_1 (histogram *r)
 
       bin_low_pc = lowpc + (bfd_vma) (hist_scale * i);
       bin_high_pc = lowpc + (bfd_vma) (hist_scale * (i + 1));
-      time = bin_count;
+      count_time = bin_count;
 
       DBG (SAMPLEDEBUG,
 	   printf (
@@ -387,7 +387,7 @@ hist_assign_samples_1 (histogram *r)
 		    (unsigned long) (sizeof (UNIT) * bin_low_pc),
 		    (unsigned long) (sizeof (UNIT) * bin_high_pc),
 		    bin_count));
-      total_time += time;
+      total_time += count_time;
 
       /* Credit all symbols that are covered by bin I.  */
       for (j = j - 1; j < symtab.len; ++j)
@@ -414,11 +414,11 @@ hist_assign_samples_1 (histogram *r)
 	       "[assign_samples] [0x%lx,0x%lx) %s gets %f ticks %ld overlap\n",
 			   (unsigned long) symtab.base[j].addr,
 			   (unsigned long) (sizeof (UNIT) * sym_high_pc),
-			   symtab.base[j].name, overlap * time / hist_scale,
+			   symtab.base[j].name, overlap * count_time / hist_scale,
 			   (long) overlap));
 
 	      addr = symtab.base[j].addr;
-	      credit = overlap * time / hist_scale;
+	      credit = overlap * count_time / hist_scale;
 
 	      /* Credit symbol if it appears in INCL_FLAT or that
 		 table is empty and it does not appear it in
@@ -563,9 +563,9 @@ void
 hist_print ()
 {
   Sym **time_sorted_syms, *top_dog, *sym;
-  unsigned int index;
+  unsigned int sym_index;
   unsigned log_scale;
-  double top_time, time;
+  double top_time;
   bfd_vma addr;
 
   if (first_output)
@@ -592,8 +592,8 @@ hist_print ()
      and tertiary keys).  */
   time_sorted_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
 
-  for (index = 0; index < symtab.len; ++index)
-    time_sorted_syms[index] = &symtab.base[index];
+  for (sym_index = 0; sym_index < symtab.len; ++sym_index)
+    time_sorted_syms[sym_index] = &symtab.base[sym_index];
 
   qsort (time_sorted_syms, symtab.len, sizeof (Sym *), cmp_time);
 
@@ -609,18 +609,20 @@ hist_print ()
       top_dog = 0;
       top_time = 0.0;
 
-      for (index = 0; index < symtab.len; ++index)
+      for (sym_index = 0; sym_index < symtab.len; ++sym_index)
 	{
-	  sym = time_sorted_syms[index];
+	  sym = time_sorted_syms[sym_index];
 
 	  if (sym->ncalls != 0)
 	    {
-	      time = (sym->hist.time + sym->cg.child_time) / sym->ncalls;
+	      double call_time;
 
-	      if (time > top_time)
+	      call_time = (sym->hist.time + sym->cg.child_time) / sym->ncalls;
+
+	      if (call_time > top_time)
 		{
 		  top_dog = sym;
-		  top_time = time;
+		  top_time = call_time;
 		}
 	    }
 	}
@@ -644,16 +646,16 @@ hist_print ()
      I-cache misses etc.).  */
   print_header (SItab[log_scale].prefix);
 
-  for (index = 0; index < symtab.len; ++index)
+  for (sym_index = 0; sym_index < symtab.len; ++sym_index)
     {
-      addr = time_sorted_syms[index]->addr;
+      addr = time_sorted_syms[sym_index]->addr;
 
       /* Print symbol if its in INCL_FLAT table or that table
 	is empty and the symbol is not in EXCL_FLAT.  */
       if (sym_lookup (&syms[INCL_FLAT], addr)
 	  || (syms[INCL_FLAT].len == 0
 	      && !sym_lookup (&syms[EXCL_FLAT], addr)))
-	print_line (time_sorted_syms[index], SItab[log_scale].scale);
+	print_line (time_sorted_syms[sym_index], SItab[log_scale].scale);
     }
 
   free (time_sorted_syms);