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cppdraft/cstdarg/syn.md

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+[cstdarg.syn]
+
+# 17 Language support library [[support]](./#support)
+
+## 17.14 Other runtime support [[support.runtime]](support.runtime#cstdarg.syn)
+
+### 17.14.2 Header <cstdarg> synopsis [cstdarg.syn]
+
+[🔗](#header:%3ccstdarg%3e)
+
+// all freestanding#define __STDC_VERSION_STDARG_H__ 202311Lnamespace std {using [va_list](#lib:va_list "17.14.2 Header <cstdarg> synopsis [cstdarg.syn]") = *see below*;}#define va_arg(V, P) *see below*#define va_copy(VDST, VSRC) *see below*#define va_end(V) *see below*#define va_start(V, ...) *see below*
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L6396)
+
+The contents of the header <cstdarg> are the same as the C
+standard library header [<stdarg.h>](support.c.headers.general#header:%3cstdarg.h%3e "17.15.1 General [support.c.headers.general]"), with the following changes:
+
+- [(1.1)](#1.1)
+
+  In lieu of the default argument promotions specified in ISO/IEC 9899:2024 6.5.2.2,
+the definition in [[expr.call]](expr.call "7.6.1.3 Function call") applies[.](#1.1.sentence-1)
+
+- [(1.2)](#1.2)
+
+  The preprocessing tokens
+comprising the second and subsequent arguments to va_start (if any)
+are discarded[.](#1.2.sentence-1)
+  [*Note [1](#note-1)*:
+  va_start accepts a second argument
+for compatibility with prior revisions of C++[.](#1.2.sentence-2)
+ — *end note*]
+
+See also: ISO/IEC 9899:2024, 7.16