re PR fortran/20520 (allocatable arrays used uninitialized without a warning)

2018-10-31  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/20520
	* gfortran.dg/allocatable_uninitialized_1.f90: New test.

From-SVN: r265698

gcc/testsuite/ChangeLog

+2018-10-31  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/20520
+	* gfortran.dg/allocatable_uninitialized_1.f90: New test.
+
 2018-10-31  Nathan Sidwell  <nathan@acm.org>
 
 	* g++.dg/lookup/friend21.C: New.

gcc/testsuite/gfortran.dg/allocatable_uninitialized_1.f90

+! { dg-do compile }
+! { dg-options "-O -Wall" }
+program main
+  real,allocatable:: a(:),b(:)
+
+   a(1)=2*b(1) ! { dg-warning "uninitialized" }
+
+end