[llvm] [llvm] Fix - gcc error: buf may be used uninitialized [-Werror=maybe-uninitialized] (PR #213578)

[Arun Thangamani via llvm-commits]

https://github.com/arun-thmn created https://github.com/llvm/llvm-project/pull/213578

None

>From 5cd82cb89285ebce161ccb5e18c90fa62989b9ae Mon Sep 17 00:00:00 2001
From: Arun Thangamani <arun.thangamani at intel.com>
Date: Sun, 2 Aug 2026 18:53:30 -0700
Subject: [PATCH] gcc error: buf may be used uninitialized
 [-Werror=maybe-uninitialized]

---
 llvm/include/llvm/ADT/Hashing.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/include/llvm/ADT/Hashing.h b/llvm/include/llvm/ADT/Hashing.h
index bb965bea86d0c..b05598486abc7 100644
--- a/llvm/include/llvm/ADT/Hashing.h
+++ b/llvm/include/llvm/ADT/Hashing.h
@@ -306,7 +306,7 @@ template <typename... Ts> hash_code hash_combine(const Ts &...args) {
   constexpr size_t Total = hashing::detail::total_hashable_size<Ts...>();
   // Round up so `data()` is non-null when Total == 0; combine_bytes won't
   // read the buffer in that case (len=0 short-circuits in xxh3_64bits).
-  std::array<char, std::max<size_t>(1, Total)> buf;
+  std::array<char, std::max<size_t>(1, Total)> buf{};
   [[maybe_unused]] size_t off = 0;
   (hashing::detail::store_hashable_data(buf.data(), off, args), ...);
   return hashing::detail::combine_bytes(buf.data(), Total);