ewah: add convenient wrapper ewah_serialize_strbuf()

diff --git a/ewah/ewok.h b/ewah/ewok.h
index f6ad190a038a55e39a0b8b135c995413192f80e3..e73252536702aaf9fed17757937fbaf4b4593f91 100644 (file)
--- a/ewah/ewok.h
+++ b/ewah/ewok.h
@@ -30,6 +30,7 @@
 #      define ewah_calloc xcalloc
 #endif
 
+struct strbuf;
 typedef uint64_t eword_t;
 #define BITS_IN_WORD (sizeof(eword_t) * 8)
 
@@ -47,7 +48,8 @@ static inline uint32_t ewah_bit_popcount64(uint64_t x)
        return (x * 0x0101010101010101ULL) >> 56;
 }
 
-#ifdef __GNUC__
+/* __builtin_ctzll was not available until 3.4.0 */
+#if defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3  && __GNUC_MINOR > 3))
 #define ewah_bit_ctz64(x) __builtin_ctzll(x)
 #else
 static inline int ewah_bit_ctz64(uint64_t x)
@@ -97,6 +99,7 @@ int ewah_serialize_to(struct ewah_bitmap *self,
                      void *out);
 int ewah_serialize(struct ewah_bitmap *self, int fd);
 int ewah_serialize_native(struct ewah_bitmap *self, int fd);
+int ewah_serialize_strbuf(struct ewah_bitmap *self, struct strbuf *);
 
 int ewah_deserialize(struct ewah_bitmap *self, int fd);
 int ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len);