[UBSAN] Apply abseil ubsan fix

abseil-cpp.spec

@@ -2,10 +2,12 @@
 ## INCLUDE cpp-standard
 
 Source: https://github.com/abseil/abseil-cpp/archive/%{realversion}.tar.gz
+Patch0: patches/abseil-cpp-ubsan
 BuildRequires: cmake gmake
 
 %prep
 %setup -n %{n}-%{realversion}
+%patch0 -p1
 
 %build
 rm -rf ../build

patches/abseil-cpp-ubsan.patch

@@ -0,0 +1,44 @@
+diff --git a/absl/container/internal/hash_policy_traits.h b/absl/container/internal/hash_policy_traits.h
+index e469d71..6c6627b 100644
+--- a/absl/container/internal/hash_policy_traits.h
++++ b/absl/container/internal/hash_policy_traits.h
+@@ -28,6 +28,16 @@
+ namespace absl {
+ ABSL_NAMESPACE_BEGIN
+ namespace container_internal {
++// Selects the policy-provided type-erased hash-slot function, or the generic
++// non-type-erased fallback when the policy returns nullptr.
++template <HashSlotFn kFallbackFn, HashSlotFn kPolicyFn>
++struct HashSlotFnSelector {
++  static constexpr HashSlotFn kValue = kPolicyFn;
++};
++template <HashSlotFn kFallbackFn>
++struct HashSlotFnSelector<kFallbackFn, nullptr> {
++  static constexpr HashSlotFn kValue = kFallbackFn;
++};
+
+ // Defines how slots are initialized/destroyed/moved.
+ template <class Policy, class = void>
+@@ -148,19 +158,9 @@ template <class Policy, class = void>
+
+   template <class Hash, bool kIsDefault>
+   static constexpr HashSlotFn get_hash_slot_fn() {
+-// get_hash_slot_fn may return nullptr to signal that non type erased function
+-// should be used. GCC warns against comparing function address with nullptr.
+-#if defined(__GNUC__) && !defined(__clang__)
+-#pragma GCC diagnostic push
+-// silent error: the address of * will never be NULL [-Werror=address]
+-#pragma GCC diagnostic ignored "-Waddress"
+-#endif
+-    return Policy::template get_hash_slot_fn<Hash, kIsDefault>() == nullptr
+-               ? &hash_slot_fn_non_type_erased<Hash, kIsDefault>
+-               : Policy::template get_hash_slot_fn<Hash, kIsDefault>();
+-#if defined(__GNUC__) && !defined(__clang__)
+-#pragma GCC diagnostic pop
+-#endif
++    return HashSlotFnSelector<
++        &hash_slot_fn_non_type_erased<Hash, kIsDefault>,
++        Policy::template get_hash_slot_fn<Hash, kIsDefault>()>::kValue;
+   }
+
+   // Whether small object optimization is enabled. True by default.