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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Felix Hanau <felix@cloudflare.com>
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Date: Sun, 8 Jun 2025 16:39:03 -0400
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Subject: Port concurrent mksnapshot support
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Change-Id: I57c8158ff5d624e5379e6b072f27ac7a40419522
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diff --git a/BUILD.bazel b/BUILD.bazel
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index 8eb045f0260fc30a786acfabfcae3d62879aaef3..71db68eef5cce90ec721dabdef446aee224bce9a 100644
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--- a/BUILD.bazel
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+++ b/BUILD.bazel
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@@ -120,6 +120,11 @@ v8_flag(name = "v8_enable_hugepage")
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 v8_flag(name = "v8_enable_fast_mksnapshot")
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+v8_flag(
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+    name = "v8_enable_concurrent_mksnapshot",
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+    default = True,
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+)
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+
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 v8_flag(name = "v8_enable_future")
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 # NOTE: Transitions are not recommended in library targets:
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@@ -4541,6 +4546,13 @@ v8_mksnapshot(
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             "--no-turbo-verify-allocation",
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         ],
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         "//conditions:default": [],
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+    }) + select({
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+        ":is_v8_enable_concurrent_mksnapshot": [
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+            "--concurrent-builtin-generation",
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+            # Use all the cores for concurrent builtin generation.
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+            "--concurrent-turbofan-max-threads=0",
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+        ],
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+        "//conditions:default": [],
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     }) + select({
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         ":is_v8_enable_snapshot_code_comments": ["--code-comments"],
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         "//conditions:default": [],