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[PATCH v2] manual: Update @standards for [__]va_copy.


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.
---
 manual/lang.texi | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/manual/lang.texi b/manual/lang.texi
index cacbdfb7c5..0ba002a396 100644
--- a/manual/lang.texi
+++ b/manual/lang.texi
@@ -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,
-- 
2.12.2


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