Add early return for invalid STATUS for close.

2020-05-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR libfortran/95119
	* io/close.c (close_status): Add CLOSE_INVALID.
	(st_close): Return early on invalid STATUS parameter.

2020-05-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR libfortran/95119
	* testsuite/libgomp.fortran/close_errors_1.f90: New test.

(cherry picked from commit cdc34b505796327b3eee9e97bc5f27ba71fd9e7a)
(cherry picked from commit d975519ad1066ed0397714c91aafadadb52a63dd)

libgfortran/ChangeLog

+2020-05-22  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR libfortran/95119
+	* io/close.c (close_status): Add CLOSE_INVALID.
+	(st_close): Return early on invalid STATUS parameter.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libgfortran/io/close.c

@@ -31,7 +31,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #endif
 
 typedef enum
-{ CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }
+{ CLOSE_INVALID = - 1, CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }
 close_status;
 
 static const st_option status_opt[] = {
@@ -61,6 +61,12 @@ st_close (st_parameter_close *clp)
     find_option (&clp->common, clp->status, clp->status_len,
 		 status_opt, "Bad STATUS parameter in CLOSE statement");
 
+  if (status == CLOSE_INVALID)
+    {
+      library_end ();
+      return;
+    }
+
   u = find_unit (clp->common.unit);
 
   if (ASYNC_IO && u && u->au)

libgomp/ChangeLog

+2020-05-22  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR libfortran/95119
+	* testsuite/libgomp.fortran/close_errors_1.f90: New test.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libgomp/testsuite/libgomp.fortran/close_errors_1.f90

+! { dg-do run }
+! PR 95115 - this used to hang with -pthread.  Original test case by
+! Bill Long.
+
+program test
+  character(len=16) my_status
+  character(len=1000) :: iomsg
+  open (unit=10, file='test.dat')
+  print *,42
+  write (10, *) 'weird'
+  rewind (10)
+  read (10, *) my_status
+  close (10)
+  open (unit=10, file='test.dat')
+  close (unit=10, status=my_status, iostat=ios, iomsg=iomsg)
+  if (ios == 0) stop 1
+  if (iomsg /= "Bad STATUS parameter in CLOSE statement") stop 2
+  close (10, status='delete')
+end program test