X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=compiler%2Fcompiler.h;h=40e857c004c6e4304565ad1e446b4bffaf90eb35;hb=2a2743361cf643b9dd2ba3e491da62e7cb83a101;hp=72e84197584e1aa8872e2905bc70710989443416;hpb=67bf982340d95ca98098ea050b54b4c7adb116c0;p=fio.git

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 72e84197..40e857c0 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -13,4 +13,46 @@
 #define __must_check
 #endif
 
+/*
+ * 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; \
+})
+
+#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__)
+
 #endif