Only use MADV_RANDOM if defined

needed to compile on Haiku.

fixes https://github.com/official-stockfish/Stockfish/issues/3093

closes https://github.com/official-stockfish/Stockfish/pull/3094

No functional change

diff --git a/src/syzygy/tbprobe.cpp b/src/syzygy/tbprobe.cpp
index 3dfe3e3e481053d581703954c44ce62dec5b1a3f..4d682f1a90bc2a38f0e0c444a8e45b833afcb781 100644 (file)
--- a/src/syzygy/tbprobe.cpp
+++ b/src/syzygy/tbprobe.cpp
@@ -223,7 +223,9 @@ public:
 
         *mapping = statbuf.st_size;
         *baseAddress = mmap(nullptr, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
 
         *mapping = statbuf.st_size;
         *baseAddress = mmap(nullptr, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);

+#if defined(MADV_RANDOM)

         madvise(*baseAddress, statbuf.st_size, MADV_RANDOM);
         madvise(*baseAddress, statbuf.st_size, MADV_RANDOM);

+#endif

         ::close(fd);
 
         if (*baseAddress == MAP_FAILED)
         ::close(fd);
 
         if (*baseAddress == MAP_FAILED)