X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fbasic%2Fmacro.h;h=6b2aeb933fdd36bcbcc02cefea06bcc2324322ff;hp=2695d0edb75ba436e645fc1f32786dde78e22bbd;hb=7b4a8335022121d06336eae363f3d7fcbcac1c45;hpb=076d998b73bf53e6652ea3ae4bed169e57423741

diff --git a/src/basic/macro.h b/src/basic/macro.h
index 2695d0edb..6b2aeb933 100644
--- a/src/basic/macro.h
+++ b/src/basic/macro.h
@@ -23,10 +23,15 @@
 #include <inttypes.h>
 #include <stdbool.h>
 #include <sys/param.h>
+#include <sys/sysmacros.h>
 #include <sys/types.h>
 
 #define _printf_(a,b) __attribute__ ((format (printf, a, b)))
-#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
+#ifdef __clang__
+#  define _alloc_(...)
+#else
+#  define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
+#endif
 #define _sentinel_ __attribute__ ((sentinel))
 #define _unused_ __attribute__ ((unused))
 #define _destructor_ __attribute__ ((destructor))
@@ -84,6 +89,15 @@
 #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
 #define UNIQ __COUNTER__
 
+/* builtins */
+#if __SIZEOF_INT__ == 4
+#define BUILTIN_FFS_U32(x) __builtin_ffs(x);
+#elif __SIZEOF_LONG__ == 4
+#define BUILTIN_FFS_U32(x) __builtin_ffsl(x);
+#else
+#error "neither int nor long are four bytes long?!?"
+#endif
+
 /* Rounds up */
 
 #define ALIGN4(l) (((l) + 3) & ~3)
@@ -224,7 +238,7 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
 /* We override the glibc assert() here. */
 #undef assert
 #ifdef NDEBUG
-#define assert(expr) do {} while(false)
+#define assert(expr) do {} while (false)
 #else
 #define assert(expr) assert_message_se(expr, #expr)
 #endif
@@ -361,6 +375,12 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
                 _found;                         \
         })
 
+#define SWAP_TWO(x, y) do {                        \
+                typeof(x) _t = (x);                \
+                (x) = (y);                         \
+                (y) = (_t);                        \
+        } while (false)
+
 /* Define C11 thread_local attribute even on older gcc compiler
  * version */
 #ifndef thread_local