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1 | /*===---- stdarg.h - Variable argument handling ----------------------------=== |
---|---|
2 | * |
3 | * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | * See https://llvm.org/LICENSE.txt for license information. |
5 | * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | * |
7 | *===-----------------------------------------------------------------------=== |
8 | */ |
9 | |
10 | /* |
11 | * This header is designed to be included multiple times. If any of the __need_ |
12 | * macros are defined, then only that subset of interfaces are provided. This |
13 | * can be useful for POSIX headers that need to not expose all of stdarg.h, but |
14 | * need to use some of its interfaces. Otherwise this header provides all of |
15 | * the expected interfaces. |
16 | * |
17 | * When clang modules are enabled, this header is a textual header. It ignores |
18 | * its header guard so that multiple submodules can export its interfaces. |
19 | * Take module SM with submodules A and B, whose headers both include stdarg.h |
20 | * When SM.A builds, __STDARG_H will be defined. When SM.B builds, the |
21 | * definition from SM.A will leak when building without local submodule |
22 | * visibility. stdarg.h wouldn't include any of its implementation headers, and |
23 | * SM.B wouldn't import any of the stdarg modules, and SM.B's `export *` |
24 | * wouldn't export any stdarg interfaces as expected. However, since stdarg.h |
25 | * ignores its header guard when building with modules, it all works as |
26 | * expected. |
27 | * |
28 | * When clang modules are not enabled, the header guards can function in the |
29 | * normal simple fashion. |
30 | */ |
31 | #if !defined(__STDARG_H) || __has_feature(modules) || \ |
32 | defined(__need___va_list) || defined(__need_va_list) || \ |
33 | defined(__need_va_arg) || defined(__need___va_copy) || \ |
34 | defined(__need_va_copy) |
35 | |
36 | #if !defined(__need___va_list) && !defined(__need_va_list) && \ |
37 | !defined(__need_va_arg) && !defined(__need___va_copy) && \ |
38 | !defined(__need_va_copy) |
39 | #define __STDARG_H |
40 | #define __need___va_list |
41 | #define __need_va_list |
42 | #define __need_va_arg |
43 | #define __need___va_copy |
44 | /* GCC always defines __va_copy, but does not define va_copy unless in c99 mode |
45 | * or -ansi is not specified, since it was not part of C90. |
46 | */ |
47 | #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \ |
48 | (defined(__cplusplus) && __cplusplus >= 201103L) || \ |
49 | !defined(__STRICT_ANSI__) |
50 | #define __need_va_copy |
51 | #endif |
52 | #endif |
53 | |
54 | #ifdef __need___va_list |
55 | #include <__stdarg___gnuc_va_list.h> |
56 | #undef __need___va_list |
57 | #endif /* defined(__need___va_list) */ |
58 | |
59 | #ifdef __need_va_list |
60 | #include <__stdarg_va_list.h> |
61 | #undef __need_va_list |
62 | #endif /* defined(__need_va_list) */ |
63 | |
64 | #ifdef __need_va_arg |
65 | #include <__stdarg_va_arg.h> |
66 | #undef __need_va_arg |
67 | #endif /* defined(__need_va_arg) */ |
68 | |
69 | #ifdef __need___va_copy |
70 | #include <__stdarg___va_copy.h> |
71 | #undef __need___va_copy |
72 | #endif /* defined(__need___va_copy) */ |
73 | |
74 | #ifdef __need_va_copy |
75 | #include <__stdarg_va_copy.h> |
76 | #undef __need_va_copy |
77 | #endif /* defined(__need_va_copy) */ |
78 | |
79 | #endif |
80 |
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