Merge #263847: nodejs_18: fix build with clang 16

...into staging-next

pkgs/development/web/nodejs/enum-width-fix-backport.patch

···
-See https://github.com/v8/v8/commit/d15d49b09dc7aef9edcc4cf6a0cb2b77a0db203f.
-
-v8 doesn’t compile with clang 16 due to an error regarding integer values being outside the enum
-range. This is fixed in v8 upstream. This patch is a backport of the fix.
-
-Note that this patch is only needed for node.js v18. It is not needed for node v20.
-
-
-diff --git a/include/v8-internal.h b/include/v8-internal.h
-index a27f3a34480..5fb0f2ac16d 100644
---- a/deps/v8/include/v8-internal.h
-+++ b/deps/v8/include/v8-internal.h
-@@ -574,7 +574,7 @@ class Internals {
- 
-   static const int kNodeClassIdOffset = 1 * kApiSystemPointerSize;
-   static const int kNodeFlagsOffset = 1 * kApiSystemPointerSize + 3;
--  static const int kNodeStateMask = 0x7;
-+  static const int kNodeStateMask = 0x3;
-   static const int kNodeStateIsWeakValue = 2;
- 
-   static const int kFirstNonstringType = 0x80;
-diff --git a/src/ast/ast.h b/src/ast/ast.h
-index 32438f9b249..8473f7fb67e 100644
---- a/deps/v8/src/ast/ast.h
-+++ b/deps/v8/src/ast/ast.h
-@@ -1006,7 +1006,7 @@ class Literal final : public Expression {
-   friend class AstNodeFactory;
-   friend Zone;
- 
--  using TypeField = Expression::NextBitField<Type, 4>;
-+  using TypeField = Expression::NextBitField<Type, 3>;
- 
-   Literal(int smi, int position) : Expression(position, kLiteral), smi_(smi) {
-     bit_field_ = TypeField::update(bit_field_, kSmi);
-diff --git a/src/base/bit-field.h b/src/base/bit-field.h
-index 9a66468d4e0..ccfc23a065d 100644
---- a/deps/v8/src/base/bit-field.h
-+++ b/deps/v8/src/base/bit-field.h
-@@ -40,6 +40,11 @@ class BitField final {
-   static constexpr U kNumValues = U{1} << kSize;
- 
-   // Value for the field with all bits set.
-+  // If clang complains
-+  // "constexpr variable 'kMax' must be initialized by a constant expression"
-+  // on this line, then you're creating a BitField for an enum with more bits
-+  // than needed for the enum values. Either reduce the BitField size,
-+  // or give the enum an explicit underlying type.
-   static constexpr T kMax = static_cast<T>(kNumValues - 1);
- 
-   template <class T2, int size2>
-diff --git a/src/compiler/backend/instruction-codes.h b/src/compiler/backend/instruction-codes.h
-index 1add351b422..2fe2cd1a74f 100644
---- a/deps/v8/src/compiler/backend/instruction-codes.h
-+++ b/deps/v8/src/compiler/backend/instruction-codes.h
-@@ -198,7 +198,7 @@ V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
-   V(None)                       \
-   TARGET_ADDRESSING_MODE_LIST(V)
- 
--enum AddressingMode {
-+enum AddressingMode : uint8_t {
- #define DECLARE_ADDRESSING_MODE(Name) kMode_##Name,
-   ADDRESSING_MODE_LIST(DECLARE_ADDRESSING_MODE)
- #undef DECLARE_ADDRESSING_MODE
-@@ -309,7 +309,7 @@ using MiscField = base::BitField<int, 22, 10>;
- // LaneSizeField and AccessModeField are helper types to encode/decode a lane
- // size, an access mode, or both inside the overlapping MiscField.
- using LaneSizeField = base::BitField<int, 22, 8>;
--using AccessModeField = base::BitField<MemoryAccessMode, 30, 2>;
-+using AccessModeField = base::BitField<MemoryAccessMode, 30, 1>;
- // TODO(turbofan): {HasMemoryAccessMode} is currently only used to guard
- // decoding (in CodeGenerator and InstructionScheduler). Encoding (in
- // InstructionSelector) is not yet guarded. There are in fact instructions for
-diff --git a/src/compiler/backend/instruction.h b/src/compiler/backend/instruction.h
-index bed43dc6363..64b9063bcf8 100644
---- a/deps/v8/src/compiler/backend/instruction.h
-+++ b/deps/v8/src/compiler/backend/instruction.h
-@@ -591,8 +591,8 @@ class LocationOperand : public InstructionOperand {
-   }
- 
-   STATIC_ASSERT(KindField::kSize == 3);
--  using LocationKindField = base::BitField64<LocationKind, 3, 2>;
--  using RepresentationField = base::BitField64<MachineRepresentation, 5, 8>;
-+  using LocationKindField = base::BitField64<LocationKind, 3, 1>;
-+  using RepresentationField = LocationKindField::Next<MachineRepresentation, 8>;
-   using IndexField = base::BitField64<int32_t, 35, 29>;
- };
- 
-diff --git a/src/handles/global-handles.cc b/src/handles/global-handles.cc
-index 536059f3115..ae9e70b3a85 100644
---- a/deps/v8/src/handles/global-handles.cc
-+++ b/deps/v8/src/handles/global-handles.cc
-@@ -652,7 +652,7 @@ class GlobalHandles::Node final : public NodeBase<GlobalHandles::Node> {
- 
-   // This stores three flags (independent, partially_dependent and
-   // in_young_list) and a State.
--  using NodeState = base::BitField8<State, 0, 3>;
-+  using NodeState = base::BitField8<State, 0, 2>;
-   using IsInYoungList = NodeState::Next<bool, 1>;
-   using NodeWeaknessType = IsInYoungList::Next<WeaknessType, 2>;
- 
-diff --git a/src/maglev/maglev-ir.h b/src/maglev/maglev-ir.h
-index 95aadfb5e14..f07f9fecf8c 100644
---- a/deps/v8/src/maglev/maglev-ir.h
-+++ b/deps/v8/src/maglev/maglev-ir.h
-@@ -315,7 +315,7 @@ class OpProperties {
-     return kNeedsRegisterSnapshotBit::decode(bitfield_);
-   }
-   constexpr bool is_pure() const {
--    return (bitfield_ | kPureMask) == kPureValue;
-+    return (bitfield_ & kPureMask) == kPureValue;
-   }
-   constexpr bool is_required_when_unused() const {
-     return can_write() || non_memory_side_effects();
-diff --git a/src/wasm/wasm-code-manager.h b/src/wasm/wasm-code-manager.h
-index f8329424777..81c7cce62e8 100644
---- a/deps/v8/src/wasm/wasm-code-manager.h
-+++ b/deps/v8/src/wasm/wasm-code-manager.h
-@@ -487,7 +487,7 @@ class V8_EXPORT_PRIVATE WasmCode final {
-   int trap_handler_index_ = -1;
- 
-   // Bits encoded in {flags_}:
--  using KindField = base::BitField8<Kind, 0, 3>;
-+  using KindField = base::BitField8<Kind, 0, 2>;
-   using ExecutionTierField = KindField::Next<ExecutionTier, 2>;
-   using ForDebuggingField = ExecutionTierField::Next<ForDebugging, 2>;
- 

pkgs/development/web/nodejs/v18.nix

···
-{ callPackage, fetchpatch, openssl, python3, enableNpm ? true }:
+{ callPackage, lib, overrideCC, pkgs, buildPackages, fetchpatch, openssl, python3, enableNpm ? true }:
 
 let
+  # Clang 16+ cannot build Node v18 due to -Wenum-constexpr-conversion errors.
+  # Use an older version of clang with the current libc++ for compatibility (e.g., with icu).
+  ensureCompatibleCC = packages:
+    if packages.stdenv.cc.isClang && lib.versionAtLeast (lib.getVersion packages.stdenv.cc.cc) "16"
+      then overrideCC packages.llvmPackages_15.stdenv (packages.llvmPackages_15.stdenv.cc.override {
+        inherit (packages.llvmPackages) libcxx;
+        extraPackages = [ packages.llvmPackages.libcxxabi ];
+      })
+      else packages.stdenv;
+
   buildNodejs = callPackage ./nodejs.nix {
     inherit openssl;
+    stdenv = ensureCompatibleCC pkgs;
+    buildPackages = buildPackages // { stdenv = ensureCompatibleCC buildPackages; };
     python = python3;
   };
 in
···
     ./revert-arm64-pointer-auth.patch
     ./node-npm-build-npm-package-logic.patch
     ./trap-handler-backport.patch
-    # Fix for enum width error when compiling with clang 16.
-    ./enum-width-fix-backport.patch
   ];
 }