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manual: Update @standards for [__]va_copy.

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The ISO version in which va_copy was introduced is made explicit, and
__va_copy is given @standards.  The description is updated to be more
clear about the origins of each macro, and the reader is informed
these macros are now provided by the compiler (information previously
embedded in a Texinfo @comment).

	* lang.texi (va_copy): Change standard from ISO to C99.
	(__va_copy): Add standard and header annotation.
	Update description for clarity of origins and current use.
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Rical Jasan 2017-06-20 03:46:24 -07:00
parent 4d98ace9de
commit 4fcdfbfcf9
2 changed files with 15 additions and 6 deletions
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6
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@ -1,3 +1,9 @@
2017-08-10 Rical Jasan <ricaljasan@pacific.net>
* lang.texi (va_copy): Change standard from ISO to C99.
(__va_copy): Add standard and header annotation.
Update description for clarity of origins and current use.
2017-08-10 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
[BZ #21941]

15
manual/lang.texi
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@ -471,18 +471,21 @@ of the same type.
@deftypefn {Macro} void va_copy (va_list @var{dest}, va_list @var{src})
@deftypefnx {Macro} void __va_copy (va_list @var{dest}, va_list @var{src})
@standardsx{va_copy, ISO, stdarg.h}
@standardsx{va_copy, C99, stdarg.h}
@standardsx{__va_copy, GNU, stdarg.h}
@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
@c This is no longer provided by glibc, but rather by the compiler.
The @code{va_copy} macro allows copying of objects of type
@code{va_list} even if this is not an integral type. The argument pointer
in @var{dest} is initialized to point to the same argument as the
pointer in @var{src}.
This macro was added in ISO C99. When building for strict conformance
to ISO C90 (@samp{gcc -ansi}), it is not available. The macro
@code{__va_copy} is available as a GNU extension in any standards
mode; before GCC 3.0, it was the only macro for this functionality.
@code{va_copy} was added in ISO C99. When building for strict
conformance to ISO C90 (@samp{gcc -std=c90}), it is not available.
GCC provides @code{__va_copy}, as an extension, in any standards mode;
before GCC 3.0, it was the only macro for this functionality.
These macros are no longer provided by @theglibc{}, but rather by the
compiler.
@end deftypefn
If you want to use @code{va_copy} and be portable to pre-C99 systems,