The attached patch fixes PR fortran/30792. A substring
reference is invalid for a data-implied-do. Regression
tested on x86_64-*-freebsd. OK to commit.
2018-02-23 Steven G. Kargl <ka...@gcc.gnu.org>
PR fortran/30792
* decl.c (gfc_match_data): Check for invalid substring in
data-implied-do
2018-02-23 Steven G. Kargl <ka...@gcc.gnu.org>
PR fortran/30792
* gfortran.dg/data_substring.f90: New test.
--
Steve
Index: gcc/fortran/decl.c
===================================================================
--- gcc/fortran/decl.c (revision 257951)
+++ gcc/fortran/decl.c (working copy)
@@ -585,6 +585,20 @@ gfc_match_data (void)
if (m != MATCH_YES)
goto cleanup;
+ if (new_data->var->iter.var
+ && new_data->var->iter.var->ts.type == BT_INTEGER
+ && new_data->var->iter.var->symtree->n.sym->attr.implied_index == 1
+ && new_data->var->list
+ && new_data->var->list->expr
+ && new_data->var->list->expr->ts.type == BT_CHARACTER
+ && new_data->var->list->expr->ref
+ && new_data->var->list->expr->ref->type == REF_SUBSTRING)
+ {
+ gfc_error ("Invalid substring in data-implied-do at %L in DATA "
+ "statement", &new_data->var->list->expr->where);
+ goto cleanup;
+ }
+
m = top_val_list (new_data);
if (m != MATCH_YES)
goto cleanup;
Index: gcc/testsuite/gfortran.dg/data_substring.f90
===================================================================
--- gcc/testsuite/gfortran.dg/data_substring.f90 (nonexistent)
+++ gcc/testsuite/gfortran.dg/data_substring.f90 (working copy)
@@ -0,0 +1,6 @@
+! { dg-do compile }
+! PR fortran/30792
+character string*1025
+integer i
+data (string(i:i),i=1,1025)/1025*'?'/ ! { dg-error "Invalid substring" }
+end
