re PR libfortran/68987 (double free or corruption in _gfortran_st_write_done…

re PR libfortran/68987 (double free or corruption in _gfortran_st_write_done when a write statement to an internal file uses an invalid format and the ERR= specifier appears.)

2015-12-30  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/68987
	* gfortran.dg/error_format_2.f90: New test.

From-SVN: r232007

gcc/testsuite/ChangeLog

+2015-12-30  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR fortran/68987
+	* gfortran.dg/error_format_2.f90: New test.
+
 2015-12-30  John David Anglin  <danglin@gcc.gnu.org>
 
 	* gfortran.dg/coarray_40.f90: Revise to use dg-additional-options.

gcc/testsuite/gfortran.dg/error_format_2.f90

+! { dg-do run }
+! PR68987, this test case failed on a memory double free
+program foo
+  call s('(foo)')
+end program
+subroutine s(fmt)
+  character (*) :: fmt
+  character (1) :: c
+  integer :: i
+  write (c, fmt, iostat=i) 42
+ ! print *, i
+  if (i==0) call abort()
+  write (c, fmt, err=100) 42
+  call abort()
+100 continue
+end subroutine