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diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -151,13 +151,9 @@
#endif /* !(__STDC__ || __cplusplus) */
/*
- * Compiler-dependent macros to help declare dead (non-returning) and
- * pure (no side effects) functions, and unused variables. They are
- * null except for versions of gcc that are known to support the features
- * properly (old versions of gcc-2 supported the dead and pure features
- * in a different (wrong) way). If we do not provide an implementation
- * for a given compiler, let the compile fail if it is told to use
- * a feature that we cannot live without.
+ * Compiler-dependent macros to help declare dead (non-returning) and pure (no
+ * side effects) functions, and unused variables. These attributes are supported
+ * by all current compilers, even pcc.
*/
#define __weak_symbol __attribute__((__weak__))
#define __dead2 __attribute__((__noreturn__))
@@ -266,7 +262,7 @@
__has_extension(c_generic_selections)
#define __generic(expr, t, yes, no) \
_Generic(expr, t: yes, default: no)
-#elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
+#elif !defined(__cplusplus)
#define __generic(expr, t, yes, no) \
__builtin_choose_expr( \
__builtin_types_compatible_p(__typeof((0, (expr))), t), yes, no)
@@ -290,19 +286,8 @@
#define __malloc_like __attribute__((__malloc__))
#define __pure __attribute__((__pure__))
-#if __GNUC_PREREQ__(3, 1)
#define __always_inline __attribute__((__always_inline__))
-#else
-#define __always_inline
-#endif
-
-#if __GNUC_PREREQ__(3, 1)
#define __noinline __attribute__ ((__noinline__))
-#else
-#define __noinline
-#endif
-
-#if __GNUC_PREREQ__(3, 4)
#define __fastcall __attribute__((__fastcall__))
#define __result_use_check __attribute__((__warn_unused_result__))
#ifdef __clang__
@@ -316,10 +301,6 @@
#else
#define __result_use_or_ignore_check
#endif /* !__clang__ */
-#else
-#define __fastcall
-#define __result_use_check
-#endif
#if __GNUC_PREREQ__(4, 1)
#define __returns_twice __attribute__((__returns_twice__))
@@ -408,15 +389,10 @@
* assign pointer x to a local variable, to check that its type is
* compatible with member m.
*/
-#if __GNUC_PREREQ__(3, 1)
#define __containerof(x, s, m) ({ \
const volatile __typeof(((s *)0)->m) *__x = (x); \
__DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
})
-#else
-#define __containerof(x, s, m) \
- __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
-#endif
/*
* Compiler-dependent macros to declare that functions take printf-like
@@ -434,14 +410,8 @@
#define __strftimelike(fmtarg, firstvararg) \
__attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
-/* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
-#if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
- defined(__GNUC__)
#define __printf0like(fmtarg, firstvararg) \
__attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
-#else
-#define __printf0like(fmtarg, firstvararg)
-#endif
#define __strong_reference(sym,aliassym) \
extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
@@ -534,11 +504,7 @@
#endif
#if !defined(_STANDALONE) && !defined(_KERNEL)
-#if defined(__GNUC__) || defined(__PCC__)
#define __RENAME(x) __asm(__STRING(x))
-#else
-#define __RENAME(x) no renaming support for compiler in use
-#endif /* __GNUC__ */
#else /* _STANDALONE || _KERNEL */
#define __RENAME(x) no renaming in kernel/standalone environment
#endif

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