From 15ed0f6a845500c6dba0b3d827d341d8de0d15c6 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Tue, 6 Jul 2021 13:13:30 +0300
Subject: [PATCH] mdbx++: workaround for compile-time 'uninitialized' warning
 (i.e. a GCC's bug) from GCC 10.x with enabled UB-sanitizer.

---
 mdbx.h++ | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mdbx.h++ b/mdbx.h++
index 3bd7c61f..fae4c441 100644
--- a/mdbx.h++
+++ b/mdbx.h++
@@ -1172,6 +1172,9 @@ private:
           /* properly destroy allocator::pointer */
           allocated_.~allocated();
         }
+        if (::std::is_trivial<allocator_pointer>::value)
+          /* workaround for "uninitialized" warning from some compilers */
+          ::std::memset(&allocated_.ptr_, 0, sizeof(allocated_.ptr_));
         lastbyte() = inplace_lastbyte_mask();
         MDBX_CONSTEXPR_ASSERT(is_inplace() && address() == inplace_ &&
                               is_suitable_for_inplace(capacity()));