The Linux kernel's build system appears set for notable upgrades in version 7.2, with Kbuild updates that would tighten compiler requirements and introduce support for a more efficient link-time optimisation workflow.
According to Phoronix, pull requests for the Kbuild subsystem were circulated ahead of the Linux 7.1 release, targeting inclusion in the 7.2 development cycle. The reported changes include a bumped minimum version requirement for the LLVM/Clang compiler toolchain, along with support for Distributed ThinLTO.
What is Distributed ThinLTO?
ThinLTO (Link-Time Optimisation) is a compilation strategy that performs optimisations across translation units without requiring a full, monolithic link step. The "distributed" variant allows this work to be spread across multiple build nodes, making it potentially attractive for large-scale CI/CD pipelines and developers building the kernel on distributed infrastructure.
For the Linux kernel — one of the largest open-source codebases in existence — the ability to parallelise LTO across machines could meaningfully reduce build times for configurations that enable link-time optimisation, which has historically been one of the most resource-intensive aspects of a kernel build.
LLVM/Clang version considerations
Raising the minimum LLVM/Clang version would be a practical maintenance decision. Newer LLVM releases bring code generation improvements, better diagnostics, and features that Kbuild may increasingly depend on. Keeping the minimum version current allows kernel developers to write cleaner build logic and avoid carrying compatibility shims for older compilers.
Such a change would not affect users who build the kernel with GCC, which remains the default and most widely used compiler for Linux. Google, for example, ships Android kernels compiled with Clang, and major distributions have increasingly validated Clang-built kernels.
Broader context
The reported Kbuild changes would land alongside a steady stream of feature pull requests queued for the 7.2 merge window. The kernel's build system has seen sustained investment in recent cycles, with improvements to reproducibility, cross-compilation support, and toolchain flexibility all receiving attention.
Editor's note: The original Phoronix article could not be independently verified at time of publication due to technical issues accessing the source content. Details are based on the article headline and summary provided. Readers are encouraged to consult the original report for full details.
Linux 核心的建構系統似乎將在 7.2 版迎來重大升級，Kbuild 更新預計會收緊編譯器要求，並引入對更高效的連結時優化工作流程的支援。
據 Phoronix 報導，Kbuild 子系統的 pull request 在 Linux 7.1 版本發布前已流傳，目標是納入 7.2 的開發週期。報導所指的變更包括提高 LLVM/Clang 編譯器工具鏈的最低版本要求，以及加入分散式 ThinLTO 支援。
何謂分散式 ThinLTO？
ThinLTO（連結時優化）是一種編譯策略，能在無需執行完整、單體式連結步驟的情況下進行跨編譯單元的優化。其「分散式」變體允許此項工作分散到多個建構節點進行，對於大規模 CI/CD pipeline 以及在分散式基礎設施上建構核心的開發者而言，這可能具有一定吸引力。
對於現存最大型的開源程式碼庫之一的 Linux 核心而言，將 LTO 平行化到多台機器的能力，或可大幅縮減啟用了連結時優化（歷來是核心建構中最耗費資源的環節之一）的配置之建構時間。
LLVM/Clang 版本考量
提升最低 LLVM/Clang 版本將是一項務實的維護決定。較新的 LLVM 版本帶來 code generation 改進、更好的診斷功能，以及 Kbuild 可能日益依賴的特性。保持最低版本為最新，讓核心開發者能編寫更清晰的建構邏輯，並避免為舊版編譯器攜帶相容性修補程式。
此類變更不會影響使用 GCC 建構核心的用戶，GCC 仍然是 Linux 的預設且使用最廣泛的編譯器。例如，Google 提供以 Clang 編譯的 Android 核心，主要發行版亦日益驗證以 Clang 建構的核心。
更廣泛的背景
報導所指的 Kbuild 變更，預計會伴隨著一連串為 7.2 合併視窗準備的功能性 pull request 而來。近年來，核心的建構系統持續獲得投入，可重現性、跨編譯支援及工具鏈靈活性等方面的改進均受到關注。
編者按：由於技術問題導致無法存取原始內容，發稿時未能獨立核實原始 Phoronix 文章。以上詳情基於所提供的文章標題及摘要整理而成。建議讀者查閱原始報導以獲取完整資訊。