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Don't document varargs.h.

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Joseph Myers 2012-03-21 17:52:19 +00:00
parent 1722813295
commit 4535cd55e2
2 changed files with 6 additions and 66 deletions
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ChangeLog
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@ -1,3 +1,9 @@
2012-03-21 Joseph Myers <joseph@codesourcery.com>
* manual/lang.texi (Old Varargs): Remove section.
(How Variadic): Update menu.
(va_start): Do not mention varargs.h.
2012-03-21 Thomas Schwinge <thomas@codesourcery.com>
Joseph Myers <joseph@codesourcery.com>

66
manual/lang.texi
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@ -229,7 +229,6 @@ additional variable arguments. @xref{Calling Variadics}.
variable arguments functions.
* Argument Macros:: Detailed specification of the macros
for accessing variable arguments.
* Old Varargs:: The pre-ISO way of defining variadic functions.
@end menu
@node Variadic Prototypes
@ -427,9 +426,6 @@ The type @code{va_list} is used for argument pointer variables.
This macro initializes the argument pointer variable @var{ap} to point
to the first of the optional arguments of the current function;
@var{last-required} must be the last required argument to the function.
@xref{Old Varargs}, for an alternate definition of @code{va_start}
found in the header file @file{varargs.h}.
@end deftypefn
@comment stdarg.h
@ -511,68 +507,6 @@ arguments facility.
@include add.c.texi
@end smallexample
@node Old Varargs
@subsubsection Old-Style Variadic Functions
@pindex varargs.h
Before @w{ISO C}, programmers used a slightly different facility for
writing variadic functions. The GNU C compiler still supports it;
currently, it is more portable than the @w{ISO C} facility, since support
for @w{ISO C} is still not universal. The header file which defines the
old-fashioned variadic facility is called @file{varargs.h}.
Using @file{varargs.h} is almost the same as using @file{stdarg.h}.
There is no difference in how you call a variadic function;
see @ref{Calling Variadics}. The only difference is in how you define
them. First of all, you must use old-style non-prototype syntax, like
this:
@smallexample
tree
build (va_alist)
va_dcl
@{
@end smallexample
Secondly, you must give @code{va_start} only one argument, like this:
@smallexample
va_list p;
va_start (p);
@end smallexample
These are the special macros used for defining old-style variadic
functions:
@comment varargs.h
@comment Unix
@deffn Macro va_alist
This macro stands for the argument name list required in a variadic
function.
@end deffn
@comment varargs.h
@comment Unix
@deffn Macro va_dcl
This macro declares the implicit argument or arguments for a variadic
function.
@end deffn
@comment varargs.h
@comment Unix
@deftypefn {Macro} void va_start (va_list @var{ap})
This macro, as defined in @file{varargs.h}, initializes the argument
pointer variable @var{ap} to point to the first argument of the current
function.
@end deftypefn
The other argument macros, @code{va_arg} and @code{va_end}, are the same
in @file{varargs.h} as in @file{stdarg.h}; see @ref{Argument Macros}, for
details.
It does not work to include both @file{varargs.h} and @file{stdarg.h} in
the same compilation; they define @code{va_start} in conflicting ways.
@node Null Pointer Constant
@section Null Pointer Constant
@cindex null pointer constant