crypto.cc: prefer bswap64() and ffs() if available.

Fixes #745.
2016-04-24 23:45:40 -04:00
parent f30738e325
commit 9073983df3
2 changed files with 20 additions and 3 deletions
@@ -399,14 +399,18 @@ public:
  [AC_MSG_RESULT([no])])
 AC_LANG_POP(C++)

-AC_CHECK_DECLS([__builtin_bswap64, __builtin_ctz])
-
 AC_CHECK_DECL([mach_absolute_time],
  [AC_DEFINE([HAVE_MACH_ABSOLUTE_TIME], [1],
     [Define if mach_absolute_time is available.])],
  , [[#include <mach/mach_time.h>]])

-AC_CHECK_DECLS([be64toh, betoh64], [], [],
+
+AC_CHECK_DECLS([__builtin_ctz])
+
+AC_CHECK_DECLS([ffs], [], [],
+  [[#include <strings.h>]])
+
+AC_CHECK_DECLS([be64toh, betoh64, bswap64, __builtin_bswap64], [], [],
  [[#if defined(HAVE_ENDIAN_H)
 #include <endian.h>
 #elif defined(HAVE_SYS_ENDIAN_H)