From 8a1de2655ce9790d5f0360e2baefb0f5c0fe2944 Mon Sep 17 00:00:00 2001
From: Joost VandeVondele <Joost.VandeVondele@gmail.com>
Date: Sat, 9 May 2020 19:45:07 +0200
Subject: [PATCH] Use posix_memalign instead of aligned_alloc

should be a little more portable to older linux systems (before glibc-2.16).

fixes https://github.com/official-stockfish/Stockfish/issues/2665

closes https://github.com/official-stockfish/Stockfish/pull/2668

No functional change.
---
 src/misc.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/misc.cpp b/src/misc.cpp
index 4d6483e7..94681008 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -303,7 +303,8 @@ void* aligned_ttmem_alloc(size_t allocSize, void*& mem) {
 
   constexpr size_t alignment = 2 * 1024 * 1024; // assumed 2MB page sizes
   size_t size = ((allocSize + alignment - 1) / alignment) * alignment; // multiple of alignment
-  mem = aligned_alloc(alignment, size);
+  if (posix_memalign(&mem, alignment, size))
+     mem = nullptr;
   madvise(mem, allocSize, MADV_HUGEPAGE);
   return mem;
 }
-- 
2.39.2