X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=compiler%2Fcompiler.h;h=8988236c828a909bca94df49891508fcfc8d8945;hb=db83b0abd16bbd6b8f589a993e6f70d9812be6e3;hp=72e84197584e1aa8872e2905bc70710989443416;hpb=836fcc0fceb233ebcc41ee63b4ea5cae20b678a4;p=fio.git

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 72e84197..8988236c 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -1,16 +1,79 @@
 #ifndef FIO_COMPILER_H
 #define FIO_COMPILER_H
 
-#if __GNUC__ >= 4
-#include "compiler-gcc4.h"
-#elif __GNUC__ == 3
-#include "compiler-gcc3.h"
+#define __must_check		__attribute__((warn_unused_result))
+
+#define __compiletime_warning(message)	__attribute__((warning(message)))
+#define __compiletime_error(message)	__attribute__((error(message)))
+
+/*
+ * Mark unused variables passed to ops functions as unused, to silence gcc
+ */
+#define fio_unused	__attribute__((__unused__))
+#define fio_init	__attribute__((constructor))
+#define fio_exit	__attribute__((destructor))
+
+#define fio_unlikely(x)	__builtin_expect(!!(x), 0)
+
+/*
+ * Check at compile time that something is of a particular type.
+ * Always evaluates to 1 so you may use it easily in comparisons.
+ */
+#define typecheck(type,x) \
+({	type __dummy; \
+	__typeof__(x) __dummy2; \
+	(void)(&__dummy == &__dummy2); \
+	1; \
+})
+
+
+#if defined(CONFIG_STATIC_ASSERT)
+#define compiletime_assert(condition, msg) _Static_assert(condition, msg)
+
+#elif !defined(CONFIG_DISABLE_OPTIMIZATIONS)
+
+#ifndef __compiletime_error
+#define __compiletime_error(message)
+#endif
+
+#ifndef __compiletime_error_fallback
+#define __compiletime_error_fallback(condition)	do { } while (0)
+#endif
+
+#define __compiletime_assert(condition, msg, prefix, suffix)		\
+	do {								\
+		int __cond = !(condition);				\
+		extern void prefix ## suffix(void) __compiletime_error(msg); \
+		if (__cond)						\
+			prefix ## suffix();				\
+		__compiletime_error_fallback(__cond);			\
+	} while (0)
+
+#define _compiletime_assert(condition, msg, prefix, suffix) \
+	__compiletime_assert(condition, msg, prefix, suffix)
+
+#define compiletime_assert(condition, msg) \
+	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
+
 #else
-#error Compiler too old, need gcc at least gcc 3.x
+
+#define compiletime_assert(condition, msg)	do { } while (0)
+
 #endif
 
-#ifndef __must_check
-#define __must_check
+#ifdef FIO_INTERNAL
+#define ARRAY_SIZE(x)    (sizeof((x)) / (sizeof((x)[0])))
+#define FIELD_SIZE(s, f) (sizeof(((__typeof__(s))0)->f))
+#endif
+
+#ifndef __has_attribute
+#define __GCC4_has_attribute___fallthrough__	0
+#endif
+
+#if __has_attribute(__fallthrough__)
+#define fallthrough	 __attribute__((__fallthrough__))
+#else
+#define fallthrough	do {} while (0)  /* fallthrough */
 #endif
 
 #endif