re PR libfortran/36044 (user-requested backtrace)

re PR libfortran/36044 (user-requested backtrace)

2012-12-20  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/36044
	* gfortran.h (gfc_isym_id): Add GFC_ISYM_BACKTRACE.
	* intrinsic.c (add_subroutines): Add "backtrace".
	* intrinsic.texi (BACKTRACE): Document BACKTRACE intrinsic.

2012-12-20  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/36044
	* gfortran.map: Add _gfortran_backtrace.
	* libgfortran.h: Rename 'show_backtrace' and export.
	* runtime/backtrace.c (show_backtrace): Rename to 'backtrace'.
	Don't show message. Close file descriptor. Export.
	* runtime/compile_options.c (backtrace_handler): Renamed
	'show_backtrace'. Move message outside.
	* runtime/error.c (sys_abort): Ditto.

From-SVN: r194648