re PR fortran/63514 (functions containing volatile are considered pure)

2018-06-09  Steven G. Kargl  <kargl@gcc.gnu.org>

 PR fortran/63514
 * symbol.c (gfc_add_volatile): Enforce F2008:C1282 and F2018:C1588.


2018-06-09  Steven G. Kargl  <kargl@gcc.gnu.org>

 PR fortran/63514
 * gfortran.dg/pr63514.f90: New test.

From-SVN: r261360

gcc/fortran/ChangeLog

+2018-06-09  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/63514
+	* symbol.c (gfc_add_volatile): Enforce F2008:C1282 and F2018:C1588.
+
 2018-06-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/85631

gcc/fortran/symbol.c

@@ -1349,6 +1349,20 @@ gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
 			 where))
       return false;
 
+  /* F2008:  C1282 A designator of a variable with the VOLATILE attribute
+     shall not appear in a pure subprogram.
+
+     F2018: C1588 A local variable of a pure subprogram, or of a BLOCK
+     construct within a pure subprogram, shall not have the SAVE or
+     VOLATILE attribute.  */
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("VOLATILE attribute at %L cannot be specified in a "
+		 "PURE procedure", where);
+      return false;
+    }
+
+
   attr->volatile_ = 1;
   attr->volatile_ns = gfc_current_ns;
   return check_conflict (attr, name, where);

gcc/testsuite/ChangeLog

+2018-06-09  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/63514
+	* gfortran.dg/pr63514.f90: New test.
+
 2018-06-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/85631

gcc/testsuite/gfortran.dg/pr63514.f90

+! { dg-do compile }
+! PR fortran/63514.f90
+program foo
+
+   implicit none
+
+   integer, volatile :: n
+
+   n = 0
+
+   call bar
+   call bah
+
+   contains
+
+   subroutine bar
+      integer k
+      integer, volatile :: m
+      block
+         integer, save :: i
+         integer, volatile :: j
+         i = 42
+         j = 2 * i
+         k = i + j + n
+      end block
+   end subroutine bar
+
+   pure subroutine bah
+      integer k
+      integer, volatile :: m     ! { dg-error "cannot be specified in a PURE" }
+      block
+         integer, save :: i      ! { dg-error "cannot be specified in a PURE" }
+         integer, volatile :: j  ! { dg-error "cannot be specified in a PURE" }
+         i = 42                  ! { dg-error "has no IMPLICIT type" }
+         j = 2 * i               ! { dg-error "has no IMPLICIT type" }
+         k = i + j + n
+      end block
+      m = k * m                  ! { dg-error "has no IMPLICIT type" }
+   end subroutine bah
+
+end program foo