gdb/gdb-fortran-common.patch

Index: gdb-7.2.90.20110525/gdb/dwarf2read.c
===================================================================
--- gdb-7.2.90.20110525.orig/gdb/dwarf2read.c	2011-05-25 17:06:19.000000000 +0200
+++ gdb-7.2.90.20110525/gdb/dwarf2read.c	2011-05-25 17:10:46.000000000 +0200
@@ -7665,12 +7665,14 @@ read_set_type (struct die_info *die, str
   return set_die_type (die, set_type, cu);
 }
 
-/* First cut: install each common block member as a global variable.  */
+/* Create appropriate locally-scoped variables for all the DW_TAG_common_block
+   entries.  Create also TYPE_CODE_STRUCT listing all such variables to be
+   available for `info common'.  COMMON_BLOCK_DOMAIN is used to sepate the
+   common blocks name namespace from regular variable names.  */
 
 static void
 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
 {
-  struct die_info *child_die;
   struct attribute *attr;
   struct symbol *sym;
   CORE_ADDR base = (CORE_ADDR) 0;
@@ -7695,20 +7697,67 @@ read_common_block (struct die_info *die,
     }
   if (die->child != NULL)
     {
+      struct objfile *objfile = cu->objfile;
+      struct die_info *child_die;
+      struct type *type;
+      struct field *field;
+      char *name;
+      struct symbol *sym;
+
+      type = alloc_type (objfile);
+      TYPE_CODE (type) = TYPE_CODE_STRUCT;
+      /* Artificial type to be used only by `info common'.  */
+      TYPE_NAME (type) = "<common>";
+
+      child_die = die->child;
+      while (child_die && child_die->tag)
+	{
+	  TYPE_NFIELDS (type)++;
+	  child_die = sibling_die (child_die);
+	}
+
+      TYPE_FIELDS (type) = obstack_alloc (&objfile->objfile_obstack,
+					  sizeof (*TYPE_FIELDS (type))
+					  * TYPE_NFIELDS (type));
+      memset (TYPE_FIELDS (type), 0, sizeof (*TYPE_FIELDS (type))
+				     * TYPE_NFIELDS (type));
+      
+      field = TYPE_FIELDS (type);
       child_die = die->child;
       while (child_die && child_die->tag)
 	{
 	  LONGEST offset;
 
+	  /* Create the symbol in the DW_TAG_common_block block in the current
+	     symbol scope.  */
 	  sym = new_symbol (child_die, NULL, cu);
+
+	  /* Undocumented in DWARF3, when it can be present?  */
 	  if (sym != NULL
 	      && handle_data_member_location (child_die, cu, &offset))
 	    {
 	      SYMBOL_VALUE_ADDRESS (sym) = base + offset;
 	      add_symbol_to_list (sym, &global_symbols);
 	    }
+
+	  if (SYMBOL_CLASS (sym) == LOC_STATIC)
+	    SET_FIELD_PHYSADDR (*field, SYMBOL_VALUE_ADDRESS (sym));
+	  else
+	    SET_FIELD_PHYSNAME (*field, SYMBOL_LINKAGE_NAME (sym));
+	  FIELD_TYPE (*field) = SYMBOL_TYPE (sym);
+	  FIELD_NAME (*field) = SYMBOL_NATURAL_NAME (sym);
+	  field++;
 	  child_die = sibling_die (child_die);
 	}
+
+      /* TYPE_LENGTH (type) is left 0 - it is only a virtual structure even
+	 with no consecutive address space.  */
+
+      sym = new_symbol (die, type, cu);
+      /* SYMBOL_VALUE_ADDRESS never gets used as all its fields are static.  */
+      SYMBOL_VALUE_ADDRESS (sym) = base;
+
+      set_die_type (die, type, cu);
     }
 }
 
@@ -11376,6 +11425,13 @@ new_symbol_full (struct die_info *die, s
 	    {
 	      var_decode_location (attr, sym, cu);
 	      attr2 = dwarf2_attr (die, DW_AT_external, cu);
+
+	      /* Fortran explicitly imports any global symbols to the local
+		 scope by DW_TAG_common_block.  */
+	      if (cu->language == language_fortran && die->parent
+		  && die->parent->tag == DW_TAG_common_block)
+		attr2 = NULL;
+
 	      if (SYMBOL_CLASS (sym) == LOC_STATIC
 		  && SYMBOL_VALUE_ADDRESS (sym) == 0
 		  && !dwarf2_per_objfile->has_section_at_zero)
@@ -11548,6 +11604,11 @@ new_symbol_full (struct die_info *die, s
 	  SYMBOL_CLASS (sym) = LOC_TYPEDEF;
 	  list_to_add = &global_symbols;
 	  break;
+	case DW_TAG_common_block:
+	  SYMBOL_CLASS (sym) = LOC_STATIC;
+	  SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
+	  add_symbol_to_list (sym, cu->list_in_scope);
+	  break;
 	default:
 	  /* Not a tag we recognize.  Hopefully we aren't processing
 	     trash data, but since we must specifically ignore things
Index: gdb-7.2.90.20110525/gdb/f-lang.c
===================================================================
--- gdb-7.2.90.20110525.orig/gdb/f-lang.c	2011-05-25 17:06:22.000000000 +0200
+++ gdb-7.2.90.20110525/gdb/f-lang.c	2011-05-25 17:07:02.000000000 +0200
@@ -446,27 +446,3 @@ _initialize_f_language (void)
 
   add_language (&f_language_defn);
 }
-
-SAVED_F77_COMMON_PTR head_common_list = NULL;	/* Ptr to 1st saved COMMON  */
-
-/* This routine finds the first encountred COMMON block named "name" 
-   that belongs to function funcname.  */
-
-SAVED_F77_COMMON_PTR
-find_common_for_function (char *name, char *funcname)
-{
-
-  SAVED_F77_COMMON_PTR tmp;
-
-  tmp = head_common_list;
-
-  while (tmp != NULL)
-    {
-      if (strcmp (tmp->name, name) == 0
-	  && strcmp (tmp->owning_function, funcname) == 0)
-	return (tmp);
-      else
-	tmp = tmp->next;
-    }
-  return (NULL);
-}
Index: gdb-7.2.90.20110525/gdb/f-lang.h
===================================================================
--- gdb-7.2.90.20110525.orig/gdb/f-lang.h	2011-05-25 17:06:22.000000000 +0200
+++ gdb-7.2.90.20110525/gdb/f-lang.h	2011-05-25 17:07:02.000000000 +0200
@@ -52,36 +52,8 @@ enum f90_range_type
     NONE_BOUND_DEFAULT		/* "(low:high)"  */
   };
 
-struct common_entry
-  {
-    struct symbol *symbol;	/* The symbol node corresponding
-				   to this component */
-    struct common_entry *next;	/* The next component */
-  };
-
-struct saved_f77_common
-  {
-    char *name;			/* Name of COMMON */
-    char *owning_function;	/* Name of parent function */
-    int secnum;			/* Section # of .bss */
-    CORE_ADDR offset;		/* Offset from .bss for 
-				   this block */
-    struct common_entry *entries;	/* List of block's components */
-    struct common_entry *end_of_entries;	/* ptr. to end of components */
-    struct saved_f77_common *next;	/* Next saved COMMON block */
-  };
-
-typedef struct saved_f77_common SAVED_F77_COMMON, *SAVED_F77_COMMON_PTR;
-
-typedef struct common_entry COMMON_ENTRY, *COMMON_ENTRY_PTR;
-
-extern SAVED_F77_COMMON_PTR head_common_list;	/* Ptr to 1st saved COMMON  */
-
-extern SAVED_F77_COMMON_PTR find_common_for_function (char *, char *);
-
 #define BLANK_COMMON_NAME_ORIGINAL "#BLNK_COM"	/* XLF assigned  */
 #define BLANK_COMMON_NAME_MF77     "__BLNK__"	/* MF77 assigned  */
-#define BLANK_COMMON_NAME_LOCAL    "__BLANK"	/* Local GDB */
 
 /* When reasonable array bounds cannot be fetched, such as when 
    you ask to 'mt print symbols' and there is no stack frame and 
Index: gdb-7.2.90.20110525/gdb/f-valprint.c
===================================================================
--- gdb-7.2.90.20110525.orig/gdb/f-valprint.c	2011-05-25 17:06:22.000000000 +0200
+++ gdb-7.2.90.20110525/gdb/f-valprint.c	2011-05-25 17:07:02.000000000 +0200
@@ -34,6 +34,8 @@
 #include "gdbcore.h"
 #include "command.h"
 #include "block.h"
+#include "dictionary.h"
+#include "gdb_assert.h"
 
 extern void _initialize_f_valprint (void);
 static void info_common_command (char *, int);
@@ -501,22 +503,54 @@ f_val_print (struct type *type, const gd
   return 0;
 }
 
-static void
-list_all_visible_commons (char *funname)
+static int
+info_common_command_for_block (struct block *block, struct frame_info *frame,
+			       const char *comname)
 {
-  SAVED_F77_COMMON_PTR tmp;
-
-  tmp = head_common_list;
+  struct dict_iterator iter;
+  struct symbol *sym;
+  int values_printed = 0;
+  const char *name;
+  struct value_print_options opts;
+
+  get_user_print_options (&opts);
+
+  ALL_BLOCK_SYMBOLS (block, iter, sym)
+    if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
+      {
+      	struct type *type = SYMBOL_TYPE (sym);
+	int index;
+
+	gdb_assert (SYMBOL_CLASS (sym) == LOC_STATIC);
+	gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT);
+
+	if (comname && (!SYMBOL_LINKAGE_NAME (sym)
+	                || strcmp (comname, SYMBOL_LINKAGE_NAME (sym)) != 0))
+	  continue;
+
+	values_printed = 1;
+	if (SYMBOL_PRINT_NAME (sym))
+	  printf_filtered (_("Contents of F77 COMMON block '%s':\n"),
+			   SYMBOL_PRINT_NAME (sym));
+	else
+	  printf_filtered (_("Contents of blank COMMON block:\n"));
+	
+	for (index = 0; index < TYPE_NFIELDS (type); index++)
+	  {
+	    struct value *val;
+
+	    gdb_assert (field_is_static (&TYPE_FIELD (type, index)));
+	    val = value_static_field (type, index);
+
+	    printf_filtered ("%s = ", TYPE_FIELD_NAME (type, index));
+	    value_print (val, gdb_stdout, &opts);
+	    putchar_filtered ('\n');
+	  }
 
-  printf_filtered (_("All COMMON blocks visible at this level:\n\n"));
+	putchar_filtered ('\n');
+      }
 
-  while (tmp != NULL)
-    {
-      if (strcmp (tmp->owning_function, funname) == 0)
-	printf_filtered ("%s\n", tmp->name);
-
-      tmp = tmp->next;
-    }
+  return values_printed;
 }
 
 /* This function is used to print out the values in a given COMMON 
@@ -526,11 +560,9 @@ list_all_visible_commons (char *funname)
 static void
 info_common_command (char *comname, int from_tty)
 {
-  SAVED_F77_COMMON_PTR the_common;
-  COMMON_ENTRY_PTR entry;
   struct frame_info *fi;
-  char *funname = 0;
-  struct symbol *func;
+  struct block *block;
+  int values_printed = 0;
 
   /* We have been told to display the contents of F77 COMMON 
      block supposedly visible in this function.  Let us 
@@ -542,74 +574,31 @@ info_common_command (char *comname, int 
   /* The following is generally ripped off from stack.c's routine 
      print_frame_info().  */
 
-  func = find_pc_function (get_frame_pc (fi));
-  if (func)
+  block = get_frame_block (fi, 0);
+  if (block == NULL)
     {
-      /* In certain pathological cases, the symtabs give the wrong
-         function (when we are in the first function in a file which
-         is compiled without debugging symbols, the previous function
-         is compiled with debugging symbols, and the "foo.o" symbol
-         that is supposed to tell us where the file with debugging symbols
-         ends has been truncated by ar because it is longer than 15
-         characters).
-
-         So look in the minimal symbol tables as well, and if it comes
-         up with a larger address for the function use that instead.
-         I don't think this can ever cause any problems; there shouldn't
-         be any minimal symbols in the middle of a function.
-         FIXME:  (Not necessarily true.  What about text labels?)  */
-
-      struct minimal_symbol *msymbol = 
-	lookup_minimal_symbol_by_pc (get_frame_pc (fi));
-
-      if (msymbol != NULL
-	  && (SYMBOL_VALUE_ADDRESS (msymbol)
-	      > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
-	funname = SYMBOL_LINKAGE_NAME (msymbol);
-      else
-	funname = SYMBOL_LINKAGE_NAME (func);
-    }
-  else
-    {
-      struct minimal_symbol *msymbol =
-	lookup_minimal_symbol_by_pc (get_frame_pc (fi));
-
-      if (msymbol != NULL)
-	funname = SYMBOL_LINKAGE_NAME (msymbol);
-      else /* Got no 'funname', code below will fail.  */
-	error (_("No function found for frame."));
+      printf_filtered (_("No symbol table info available.\n"));
+      return;
     }
 
-  /* If comname is NULL, we assume the user wishes to see the 
-     which COMMON blocks are visible here and then return.  */
-
-  if (comname == 0)
+  while (block)
     {
-      list_all_visible_commons (funname);
-      return;
+      if (info_common_command_for_block (block, fi, comname))
+	values_printed = 1;
+      /* After handling the function's top-level block, stop.  Don't
+         continue to its superblock, the block of per-file symbols.  */
+      if (BLOCK_FUNCTION (block))
+	break;
+      block = BLOCK_SUPERBLOCK (block);
     }
 
-  the_common = find_common_for_function (comname, funname);
-
-  if (the_common)
+  if (!values_printed)
     {
-      if (strcmp (comname, BLANK_COMMON_NAME_LOCAL) == 0)
-	printf_filtered (_("Contents of blank COMMON block:\n"));
+      if (comname)
+	printf_filtered (_("No common block '%s'.\n"), comname);
       else
-	printf_filtered (_("Contents of F77 COMMON block '%s':\n"), comname);
-
-      printf_filtered ("\n");
-      entry = the_common->entries;
-
-      while (entry != NULL)
-	{
-	  print_variable_and_value (NULL, entry->symbol, fi, gdb_stdout, 0);
-	  entry = entry->next;
-	}
+	printf_filtered (_("No common blocks.\n"));
     }
-  else
-    printf_filtered (_("Cannot locate the common block %s in function '%s'\n"),
-		     comname, funname);
 }
 
 void
Index: gdb-7.2.90.20110525/gdb/stack.c
===================================================================
--- gdb-7.2.90.20110525.orig/gdb/stack.c	2011-05-25 17:05:21.000000000 +0200
+++ gdb-7.2.90.20110525/gdb/stack.c	2011-05-25 17:07:02.000000000 +0200
@@ -1525,6 +1525,8 @@ iterate_over_block_locals (struct block 
 	case LOC_COMPUTED:
 	  if (SYMBOL_IS_ARGUMENT (sym))
 	    break;
+	  if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
+	    break;
 	  (*cb) (SYMBOL_PRINT_NAME (sym), sym, cb_data);
 	  break;
 
Index: gdb-7.2.90.20110525/gdb/symtab.h
===================================================================
--- gdb-7.2.90.20110525.orig/gdb/symtab.h	2011-05-25 17:05:21.000000000 +0200
+++ gdb-7.2.90.20110525/gdb/symtab.h	2011-05-25 17:07:02.000000000 +0200
@@ -411,7 +411,10 @@ typedef enum domain_enum_tag
   TYPES_DOMAIN,
 
   /* Any type.  */
-  ALL_DOMAIN
+  ALL_DOMAIN,
+
+  /* Fortran common blocks.  Their naming must be separate from VAR_DOMAIN.  */
+  COMMON_BLOCK_DOMAIN
 }
 domain_enum;
 
Index: gdb-7.2.90.20110525/gdb/testsuite/gdb.fortran/common-block.exp
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.2.90.20110525/gdb/testsuite/gdb.fortran/common-block.exp	2011-05-25 17:07:02.000000000 +0200
@@ -0,0 +1,101 @@
+# Copyright 2008 Free Software Foundation, Inc.
+
+# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+
+# This file was written by Jan Kratochvil <jan.kratochvil@redhat.com>.
+
+set testfile "common-block"
+set srcfile ${testfile}.f90
+set binfile ${objdir}/${subdir}/${testfile}
+
+if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug f77 quiet}] != "" } {
+    untested "Couldn't compile ${srcfile}"
+    return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto MAIN__] then {
+    perror "couldn't run to breakpoint MAIN__"
+    continue
+}
+
+gdb_breakpoint [gdb_get_line_number "stop-here-out"]
+gdb_continue_to_breakpoint "stop-here-out"
+
+# Common block naming with source name /foo/:
+#                .symtab  DW_TAG_common_block's DW_AT_name
+# Intel Fortran  foo_     foo_
+# GNU Fortran    foo_     foo
+#set suffix "_"
+set suffix ""
+
+set int4 {(integer\(kind=4\)|INTEGER\(4\))}
+set real4 {(real\(kind=4\)|REAL\(4\))}
+set real8 {(real\(kind=8\)|REAL\(8\))}
+
+gdb_test "whatis foo$suffix" "No symbol \"foo$suffix\" in current context."
+gdb_test "ptype foo$suffix" "No symbol \"foo$suffix\" in current context."
+gdb_test "p foo$suffix" "No symbol \"foo$suffix\" in current context."
+gdb_test "whatis fo_o$suffix" "No symbol \"fo_o$suffix\" in current context."
+gdb_test "ptype fo_o$suffix" "No symbol \"fo_o$suffix\" in current context."
+gdb_test "p fo_o$suffix" "No symbol \"fo_o$suffix\" in current context."
+
+gdb_test "info locals" "ix_x = 11\r\niy_y = 22\r\niz_z = 33\r\nix = 1\r\niy = 2\r\niz = 3" "info locals out"
+gdb_test "info common" "Contents of F77 COMMON block 'fo_o':\r\nix_x = 11\r\niy_y = 22\r\niz_z = 33\r\n\r\nContents of F77 COMMON block 'foo':\r\nix = 1\r\niy = 2\r\niz = 3" "info common out"
+
+gdb_test "ptype ix" "type = $int4" "ptype ix out"
+gdb_test "ptype iy" "type = $real4" "ptype iy out"
+gdb_test "ptype iz" "type = $real8" "ptype iz out"
+gdb_test "ptype ix_x" "type = $int4" "ptype ix_x out"
+gdb_test "ptype iy_y" "type = $real4" "ptype iy_y out"
+gdb_test "ptype iz_z" "type = $real8" "ptype iz_z out"
+
+gdb_test "p ix" " = 1 *" "p ix out"
+gdb_test "p iy" " = 2 *" "p iy out"
+gdb_test "p iz" " = 3 *" "p iz out"
+gdb_test "p ix_x" " = 11 *" "p ix_x out"
+gdb_test "p iy_y" " = 22 *" "p iy_y out"
+gdb_test "p iz_z" " = 33 *" "p iz_z out"
+
+gdb_breakpoint [gdb_get_line_number "stop-here-in"]
+gdb_continue_to_breakpoint "stop-here-in"
+
+gdb_test "whatis foo$suffix" "No symbol \"foo$suffix\" in current context." "whatis foo$suffix in"
+gdb_test "ptype foo$suffix" "No symbol \"foo$suffix\" in current context." "ptype foo$suffix in"
+gdb_test "p foo$suffix" "No symbol \"foo$suffix\" in current context." "p foo$suffix in"
+gdb_test "whatis fo_o$suffix" "No symbol \"fo_o$suffix\" in current context." "whatis fo_o$suffix in"
+gdb_test "ptype fo_o$suffix" "No symbol \"fo_o$suffix\" in current context." "ptype fo_o$suffix in"
+gdb_test "p fo_o$suffix" "No symbol \"fo_o$suffix\" in current context." "p fo_o$suffix in"
+
+gdb_test "info locals" "ix = 11\r\niy2 = 22\r\niz = 33\r\nix_x = 1\r\niy_y = 2\r\niz_z2 = 3\r\niy = 5\r\niz_z = 55" "info locals in"
+gdb_test "info common" "Contents of F77 COMMON block 'fo_o':\r\nix = 11\r\niy2 = 22\r\niz = 33\r\n\r\nContents of F77 COMMON block 'foo':\r\nix_x = 1\r\niy_y = 2\r\niz_z2 = 3" "info common in"
+
+gdb_test "ptype ix" "type = $int4" "ptype ix in"
+gdb_test "ptype iy2" "type = $real4" "ptype iy2 in"
+gdb_test "ptype iz" "type = $real8" "ptype iz in"
+gdb_test "ptype ix_x" "type = $int4" "ptype ix_x in"
+gdb_test "ptype iy_y" "type = $real4" "ptype iy_y in"
+gdb_test "ptype iz_z2" "type = $real8" "ptype iz_z2 in"
+
+gdb_test "p ix" " = 11 *" "p ix in"
+gdb_test "p iy2" " = 22 *" "p iy2 in"
+gdb_test "p iz" " = 33 *" "p iz in"
+gdb_test "p ix_x" " = 1 *" "p ix_x in"
+gdb_test "p iy_y" " = 2 *" "p iy_y in"
+gdb_test "p iz_z2" " = 3 *" "p iz_z2 in"
Index: gdb-7.2.90.20110525/gdb/testsuite/gdb.fortran/common-block.f90
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.2.90.20110525/gdb/testsuite/gdb.fortran/common-block.f90	2011-05-25 17:07:02.000000000 +0200
@@ -0,0 +1,67 @@
+! Copyright 2008 Free Software Foundation, Inc.
+!
+! 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+!
+! Ihis file is the Fortran source file for dynamic.exp.
+! Original file written by Jakub Jelinek <jakub@redhat.com>.
+! Modified for the GDB testcase by Jan Kratochvil <jan.kratochvil@redhat.com>.
+
+subroutine in
+
+   INTEGER*4            ix
+   REAL*4               iy2
+   REAL*8               iz
+
+   INTEGER*4            ix_x
+   REAL*4               iy_y
+   REAL*8               iz_z2
+
+   common /fo_o/ix,iy2,iz
+   common /foo/ix_x,iy_y,iz_z2
+
+   iy = 5
+   iz_z = 55
+
+   if (ix .ne. 11 .or. iy2 .ne. 22.0 .or. iz .ne. 33.0) call abort
+   if (ix_x .ne. 1 .or. iy_y .ne. 2.0 .or. iz_z2 .ne. 3.0) call abort
+
+   ix = 0					! stop-here-in
+
+end subroutine in
+
+program common_test
+
+   INTEGER*4            ix
+   REAL*4               iy
+   REAL*8               iz
+
+   INTEGER*4            ix_x
+   REAL*4               iy_y
+   REAL*8               iz_z
+
+   common /foo/ix,iy,iz
+   common /fo_o/ix_x,iy_y,iz_z
+
+   ix = 1
+   iy = 2.0
+   iz = 3.0
+
+   ix_x = 11
+   iy_y = 22.0
+   iz_z = 33.0
+
+   call in					! stop-here-out
+
+end program common_test