re PR fortran/23815 (Add -byteswapio flag)

re PR fortran/23815 (Add -byteswapio flag)

2005-02-06  Thomas Koenig  <Thomas.Koenig@online.de>

	PR libfortran/23815
	* gfortran.texi: Document the GFORTRAN_CONVERT_UNIT environment
	variable.
	* invoke.texi:  Mention the "Runtime" chapter.
	Document the -fconvert= option.
	* gfortran.h:  Add options_convert.
	* lang.opt:  Add fconvert=little-endian, fconvert=big-endian,
	fconvert=native and fconvert=swap.
	* trans-decl.c (top level):  Add gfor_fndecl_set_convert.
	(gfc_build_builtin_function_decls):  Set gfor_fndecl_set_convert.
	(gfc_generate_function_code):  If -fconvert was specified,
	and this is the main program, add a call to set_convert().
	* options.c:  Handle the -fconvert options.

2005-02-06  Thomas Koenig  <Thomas.Koenig@online.de>

	PR libfortran/23815
	* runtime/environ.c (init_unformatted):  Add GFORTRAN_CONVERT_UNIT
	environment variable.
	(top level):  Add defines, type and static variables for
	GFORTRAN_CONVERT_UNIT handling.
	(search_unit):  New function.
	(match_word): New function.
	(match_integer): New function.
	(next_token): New function.
	(push_token): New function.
	(mark_single): New function.
	(mark_range): New funciton.
	(do_parse): New function.
	(init_unformatted): New function.
	(get_unformatted_convert): New function.
	* runtime/compile_options.c:  Add set_convert().
	* libgfortran.h:  Add convert to compile_options_t.
	* io/open.c (st_open): Call get_unformatted_convert to get
	unit default; if CONVERT_NONE is returned, check for
	the presence of a CONVERT specifier and use it.
	As default, use compile_options.convert.
	* io/io.h (top level): Add CONVERT_NONE to unit_convert, to signal
	"nothing has been set".
	(top level): Add prototype for get_unformatted_convert.

2005-02-06  Thomas Koenig  <Thomas.Koenig@online.de>

	PR libfortran/23815
	* unf_io_convert_4.f90:  New test.

From-SVN: r110664