those cases your code should respect the identifiers reserved by those
headers. On some non-@sc{gnu} hosts, @code{<alloca.h>},
@code{<stddef.h>}, and @code{<stdlib.h>} are included as needed to
-declare memory allocators and related types. In the same situation,
-C++ parsers may include @code{<cstddef>} and @code{<cstdlib>} instead.
+declare memory allocators and related types.
Other system headers may be included if you define @code{YYDEBUG} to a
nonzero value (@pxref{Debugging, ,Debugging Your Parser}).
debugging is always possible.
The trace facility outputs messages with macro calls of the form
-@code{YYFPRINTF (YYSTDERR, @var{format}, @var{args})} where
+@code{YYFPRINTF (stderr, @var{format}, @var{args})} where
@var{format} and @var{args} are the usual @code{printf} format and
arguments. If you define @code{YYDEBUG} to a nonzero value but do not
define @code{YYFPRINTF}, @code{<stdio.h>} is automatically included
-and the macros are defined to @code{fprintf} and @code{stderr}. In
-the same situation, C++ parsers include @code{<cstdio.h>} instead, and
-use @code{std::fprintf} and @code{std::stderr}.
+and @code{YYPRINTF} is defined to @code{fprintf}.
Once you have compiled the program with trace facilities, the way to
request a trace is to store a nonzero value in the variable @code{yydebug}.