re PR fortran/34559 (ICE using REPEAT on string literals)

gcc/fortran:
2007-12-22  Daniel Franke  <franke.daniel@gmail.com>

        PR fortran/34559
        * simplify.c (gfc_simplify_repeat): Added safeguard for empty string
        literals.

gcc/testsuite:
2007-12-22  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/34559
	* gfortran.dg/repeat_6.f90: New test.

From-SVN: r131139

gcc/fortran/ChangeLog

+2007-12-22  Daniel Franke  <franke.daniel@gmail.com>
+
+	PR fortran/34559
+	* simplify.c (gfc_simplify_repeat): Added safeguard for empty
+	string literals.
+
 2007-12-22  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/34549
@@ -26,6 +32,7 @@
 	* module.c (read_module): Check sym->module is there before
 	using it in a string comparison.
 
+>>>>>>> .r131138
 2007-12-20  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/34482

gcc/fortran/simplify.c

@@ -3128,7 +3128,9 @@ gfc_simplify_repeat (gfc_expr *e, gfc_expr *n)
   if (e->expr_type != EXPR_CONSTANT)
     return NULL;
 
-  if (len || mpz_sgn (e->ts.cl->length->value.integer) != 0)
+  if (len || 
+      (e->ts.cl->length && 
+       mpz_sgn (e->ts.cl->length->value.integer)) != 0)
     {
       const char *res = gfc_extract_int (n, &ncop);
       gcc_assert (res == NULL);

gcc/testsuite/ChangeLog

+2007-12-22  Daniel Franke  <franke.daniel@gmail.com>
+
+	PR fortran/34559
+	* gfortran.dg/repeat_6.f90: New test.
+
 2007-12-22  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/34549

gcc/testsuite/gfortran.dg/repeat_6.f90

+! { dg-do run }
+!
+! PR34559 -- ICE on empty string literals
+!
+! Contributed by Tobias Burnus <burnus@gcc.gnu.org>
+!
+
+  character(len=200) :: string = "a" // repeat ("", 3)       &
+                                     // repeat ("xxx", 0)    &
+                                     // repeat ("string", 2)
+
+  if (string /= "astringstring") CALL abort()
+end