1/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
2/******************************************************************************
3 *
4 * Name: acgcc.h - GCC specific defines, etc.
5 *
6 * Copyright (C) 2000 - 2025, Intel Corp.
7 *
8 *****************************************************************************/
9
10#ifndef __ACGCC_H__
11#define __ACGCC_H__
12
13#ifndef va_arg
14#ifdef __KERNEL__
15#include <linux/stdarg.h>
16#else
17#include <stdarg.h>
18#endif /* __KERNEL__ */
19#endif /* ! va_arg */
20
21#define ACPI_INLINE __inline__
22
23/* Function name is used for debug output. Non-ANSI, compiler-dependent */
24
25#define ACPI_GET_FUNCTION_NAME __func__
26
27/*
28 * This macro is used to tag functions as "printf-like" because
29 * some compilers (like GCC) can catch printf format string problems.
30 */
31#define ACPI_PRINTF_LIKE(c) __attribute__ ((__format__ (__printf__, c, c+1)))
32
33/*
34 * Some compilers complain about unused variables. Sometimes we don't want to
35 * use all the variables (for example, _acpi_module_name). This allows us
36 * to tell the compiler warning in a per-variable manner that a variable
37 * is unused.
38 */
39#define ACPI_UNUSED_VAR __attribute__ ((unused))
40
41/* GCC supports __VA_ARGS__ in macros */
42
43#define COMPILER_VA_MACRO 1
44
45/* GCC supports native multiply/shift on 32-bit platforms */
46
47#define ACPI_USE_NATIVE_MATH64
48
49/* GCC did not support __has_attribute until 5.1. */
50
51#ifndef __has_attribute
52#define __has_attribute(x) 0
53#endif
54
55/*
56 * Explicitly mark intentional explicit fallthrough to silence
57 * -Wimplicit-fallthrough in GCC 7.1+.
58 */
59
60#if __has_attribute(__fallthrough__)
61#define ACPI_FALLTHROUGH __attribute__((__fallthrough__))
62#endif
63
64/*
65 * Flexible array members are not allowed to be part of a union under
66 * C99, but this is not for any technical reason. Work around the
67 * limitation.
68 */
69#define ACPI_FLEX_ARRAY(TYPE, NAME) \
70 struct { \
71 struct { } __Empty_ ## NAME; \
72 TYPE NAME[]; \
73 }
74
75/*
76 * Explicitly mark strings that lack a terminating NUL character so
77 * that ACPICA can be built with -Wunterminated-string-initialization.
78 */
79#if __has_attribute(__nonstring__)
80#define ACPI_NONSTRING __attribute__((__nonstring__))
81#endif
82
83#endif /* __ACGCC_H__ */
84