* gfortran.h (MAX_ERROR_MESSAGE): Remove.
	(gfc_error_buf): Add allocated and index fields.  Change message
	field from array to a pointer.
	* error.c (use_warning_buffer, error_ptr, warning_ptr): Remove.
	(cur_error_buffer): New variable.
	(error_char): Use cur_error_buffer->{message,index} instead of
	{warning,error}_{buffer.message,ptr}.  Reallocate message buffer
	if too small.
	(gfc_warning, gfc_notify_std, gfc_error, gfc_error_now): Setup
	cur_error_buffer and its index rather than {warning,error}_ptr
	and use_warning_buffer.
	(gfc_warning_check, gfc_error_check): Don't print anything if
	message is NULL.
	(gfc_push_error): Allocate saved message with xstrdup.
	(gfc_pop_error): Free saved message with gfc_free.
	(gfc_free_error): New function.
	* primary.c (match_complex_constant): Call gfc_free_error if
	gfc_pop_error will not be called.
	* match.c (gfc_match_st_function): Likewise.

	* gfortran.dg/g77/cpp6.f: New test.

From-SVN: r102015