X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=compiler%2Fcompiler.h;h=ddfbcc124e77ac2b1a5d7aea1640ccbc4577a331;hb=99952ca7747d2ec56b4ff4771ddfaa03fb0e8407;hp=036ba208e861e79225a3e8827f5ff81895c50818;hpb=7b4203d7544db58920408f65977ebd00aaec6506;p=fio.git

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 036ba208..ddfbcc12 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -1,13 +1,13 @@
 #ifndef FIO_COMPILER_H
 #define FIO_COMPILER_H
 
-#if __GNUC__ >= 4
+/* IWYU pragma: begin_exports */
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
 #include "compiler-gcc4.h"
-#elif __GNUC__ == 3
-#include "compiler-gcc3.h"
 #else
-#error Compiler too old, need gcc at least gcc 3.x
+#error Compiler too old, need at least gcc 4.1.0
 #endif
+/* IWYU pragma: end_exports */
 
 #ifndef __must_check
 #define __must_check
@@ -20,4 +20,57 @@
 #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
+
+#define compiletime_assert(condition, msg)	do { } while (0)
+
+#endif
+
+#ifdef FIO_INTERNAL
+#define ARRAY_SIZE(x)    (sizeof((x)) / (sizeof((x)[0])))
+#define FIELD_SIZE(s, f) (sizeof(((__typeof__(s))0)->f))
+#endif
+
 #endif