testcase: the following declaration causes a reading NULL pointer dereference.

union u { char *p; } __attribute__ ((transparent_union));

diff -c -p gcc-2.7.0/ChangeLog gcc-2.7.0-x/ChangeLog
*** gcc-2.7.0/ChangeLog	Sat Jul  8 01:54:05 1995
--- gcc-2.7.0-x/ChangeLog	Fri Jul 14 07:36:16 1995
***************
*** 1,3 ****
--- 1,14 ----
+ Fri Jul 14 07:34:21 1995  J"orn Rennecke (amylaar@meolyon.hanse.de)
+ 	* c-decl.c(finish_struct): wait with decl_attributes() till
+ 	TYPE_FIELDS (t) is valid.
+ 
+ Thu Jul 13 22:53:04 1995  J"orn Rennecke  (amylaar@meolyon.hanse.de)
+ 	* c-common.c(decl_attributes): bug fix for A_ALIGNED
+ 
+ Sat Jul  8 10:33:59 1995  J"orn Rennecke  (amylaar@meolyon.hanse.de)
+ 	* New optimization option -fomit-default-branch . Most of it
+ 	is in expand_end_case(). Doc in gcc.1
+ 
  Fri Jun 16 06:54:03 1995  Richard Kenner  (kenner@vlsi1.ultra.nyu.edu)
  
  	* alpha.c (alpha_builtin_saveregs): Use ptr_mode and conversions
diff -c -p gcc-2.7.0/c-decl.c gcc-2.7.0-x/c-decl.c
*** gcc-2.7.0/c-decl.c	Sat Jul  8 01:54:16 1995
--- gcc-2.7.0-x/c-decl.c	Fri Jul 14 07:30:19 1995
*************** finish_struct (t, fieldlist, attributes)
*** 5407,5414 ****
  
    TYPE_SIZE (t) = 0;
  
-   decl_attributes (t, attributes, NULL_TREE);
- 
    /* Nameless union parm types are useful as GCC extension.  */
    if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
      /* Otherwise, warn about any struct or union def. in parmlist.  */
--- 5407,5412 ----
*************** finish_struct (t, fieldlist, attributes)
*** 5585,5590 ****
--- 5583,5591 ----
       then lay out the structure or union (including the fields).  */
  
    TYPE_FIELDS (t) = fieldlist;
+ 
+   /* attribute transparent_union reads TYPE_FIELDS */
+   decl_attributes (t, attributes, NULL_TREE);
  
    layout_type (t);
  
  ----- end of diff ----