re PR fortran/77960 (ICE in gfc_conv_ss_startstride, at fortran/trans-array.c:3966)

2019-01-19  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/77960
	* io.c (match_io_element): input-item cannot be an external function.
 
2019-01-19  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/77960
	* gfortran.dg/pr77960.f90: New test.

From-SVN: r268097

gcc/fortran/ChangeLog

+2019-01-19  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/77960
+	* io.c (match_io_element): input-item cannot be an external function.
+ 
 2018-01-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
 	Paul Thomas  <pault@gcc.gnu.org>
 

gcc/fortran/io.c

@@ -3610,6 +3610,16 @@ match_io_element (io_kind k, gfc_code **cpp)
       m = gfc_match_variable (&expr, 0);
       if (m == MATCH_NO)
 	gfc_error ("Expected variable in READ statement at %C");
+
+      if (m == MATCH_YES
+	  && expr->expr_type == EXPR_VARIABLE
+	  && expr->symtree->n.sym->attr.external)
+	{
+	  gfc_error ("Expecting variable or io-implied-do at %L",
+		     &expr->where);
+	  m = MATCH_ERROR;
+	}
+
     }
   else
     {

gcc/testsuite/ChangeLog

+2019-01-19  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/77960
+	* gfortran.dg/pr77960.f90: New test.
+
 2018-01-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
 	Paul Thomas  <pault@gcc.gnu.org>
 

gcc/testsuite/gfortran.dg/pr77960.f90

+! { dg-do compile }
+! PR fortran/77960
+   procedure(g), pointer :: f
+   f => g
+   read(99) f                 ! { dg-error "Expecting variable" }
+contains
+   function g() result(z)
+      integer :: z(2)
+      z = 1
+   end
+end
+
+subroutine bar(x)
+   integer, external :: x
+   read(*,*) x                ! { dg-error "Expecting variable" }
+end subroutine