write_to_null.f90: Rename to write_to_null.F90.

	* write_to_null.f90: Rename to write_to_null.F90.
	* write_to_null.F90: On Windows, "nul" is the equivalent of the
	Unix /dev/null.

From-SVN: r135158

gcc/testsuite/ChangeLog

+2008-05-10  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	* write_to_null.f90: Rename to write_to_null.F90.
+	* write_to_null.F90: On Windows, "nul" is the equivalent of the
+	Unix /dev/null.
+
 2008-05-10  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	PR rtl-optimization/33642

gcc/testsuite/gfortran.dg/write_to_null.f90 → gcc/testsuite/gfortran.dg/write_to_null.F90

 ! { dg-do run }
 ! pr18983
 ! could not write to /dev/null
+
+#if defined  _WIN32
+#define DEV_NULL "nul"
+#else
+#define DEV_NULL "/dev/null"
+#endif
+
        integer i
-       open(10,file="/dev/null")
+       open(10,file=DEV_NULL)
        do i = 1,100
          write(10,*) "Hello, world"
        end do