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toolchain roots from bootstrap gen-4 (both arches: linux_headers, binutils, glibc, gcc) - #983
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… gen-1 The amd64 prebuilts of linux_headers, binutils (and binutils-2.46-glibc) and gcc (and gcc-15.2.0-glibc) now point at gen-1 of gominimal/bootstrap in gs://minimal-bootstrap: built from the hex0 seed, every package reproduced byte for byte on two independent machines (AMD EPYC and Intel), and checked against the published manifest after upload. Against the gen-0 tarballs they replace, file by file: - linux_headers: all 2050 entries identical. - binutils-2.46-glibc: the same 193 entries; libraries, scripts and headers identical, the 46 programs rebuilt by gen-1's gcc. - gcc-15.2.0-glibc: the same 1782 entries; 73 differ (the compilers and runtime libraries). glibc stays on gen-0: glibc's cycle-breaker takes the top-level usr/lib libraries and crt objects from the bedrock tarball, and gen-1's glibc-bedrock-2.42 ships only its declared outputs (the versioned sysroot). arm64 is unchanged (0 spec hashes move); amd64 rebuilds 564 of 624. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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No actionable comments were generated in the recent review.
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| Layer / File(s) | Summary |
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Update package artifact sources packages/linux_headers/build.ncl, packages/binutils/build.ncl, packages/binutils-2.46-glibc/build.ncl, packages/glibc/build.ncl, packages/glibc-bedrock-2.42/build.ncl, packages/gcc/build.ncl, packages/gcc-15.2.0-glibc/build.ncl |
The package definitions now select gen-4 bootstrap archives and updated SHA-256 values. Architecture-specific entries remain in place, and extraction settings are unchanged. |
Priority:
Estimated code review effort: 2 (Simple) | ~10 minutes
Change: Other
Possibly related issues
gominimal/minimermeticissue 89 — The PR changes several root artifact selections to gen-4 bootstrap archives, which aligns with the issue’s root-replacement objective. The issue also calls for other slot and arm64 graph changes not covered here.gominimal/bootstrapissue 1 — The PR uses gen-4 bootstrap artifacts for the four named roots on both architectures, matching the issue’s generation mechanism.
Suggested reviewers: msample
Merge Risk: 
f71e8
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No actionable issue is identified in the gen-4 artifact pins. The change is ready for normal CI validation on both architectures.
Pre-merge checks: 
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly identifies the main change: moving both architectures’ toolchain roots to bootstrap generation 4 for linux_headers, binutils, glibc, and gcc. Docstring Coverage No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Docstring Coverage
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Explanation
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (7 skipped: 7 unsupported.)
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linux_headers, binutils and gcc move from gen-1 to gen-3's names (the same artifacts: gen-3's amd64 rebuild reproduced them byte for byte). glibc (and glibc-bedrock-2.42) now flips too: gen-3's glibc-bedrock-2.42 carries its top-level usr/lib libraries and crt objects, which glibc's cycle-breaker reads, in gen-0's 4087-entry layout. arm64 is unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Updated to gen-3 (7ec3ba0), and glibc now flips too.
🤖 Generated with Claude Code |
amd64 moves from gen-3 to gen-4; the objects are the same bytes, re-listed under the new generation. arm64 leaves the July bedrock tarballs: linux_headers, binutils, glibc and gcc now pin gen-4, where arm builds its own kernel UAPI headers and the toolchain roots install at /usr like the slots they replace. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Checked all eight new root URLs and sha256s against gominimal/bootstrap generations/gen-4/manifest.json: each URL matches a manifest entry exactly, the sha in the path equals the sha256 field, every entry is listed as reproduced on two machines, and each slot maps to the right package per arch (arm64 binutils-2.41, glibc-bedrock-2.42, gcc-15.2.0-glibc, stage0-linux-headers-6.12.43). The diff touches only Source url/sha256 and comments, and the full world build on this head is green. The ~580-per-arch rehash is the planned world rebuild described in the body.
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Superseded by #1242, which merges this branch and repoints every bootstrap pin at gen-11 of gominimal/bootstrap. Closing to stop the duplicate world rebuilds; the branch stays. |
The pkgs toolchain roots now come from a bootstrap generation: on both arches,
linux_headers,binutils,glibcandgcc(and the amd64-glibcsiblings) pin gen-4 of gominimal/bootstrap instead of the hand-sealed bedrock tarballs.What a generation is
mipsandbox.gs://minimal-bootstrap/gen-4/sha256/<sha>/…, public read and create-only, so a published object cannot change. Each is listed ingenerations/gen-4/manifest.jsonandMANIFEST.txt, and all 51 were downloaded anonymously and checked.amd64
The same objects as gen-3 (spec hashes unchanged in bootstrap), re-listed under gen-4. Compared with the gen-0 tarballs file by file:
linux_headersall 2050 entries identical;binutilsthe same 193 entries with only the 46 programs rebuilt;gccthe same 1782 entries with 73 (compilers and runtime libraries) differing;glibcpublishes its whole /usr tree, so the cycle-breaker's top-levelusr/lib/*.{so*,a}andcrt*.oare present.arm64
New in this revision. gen-4 is the first generation where arm takes nothing from the July bedrock tarballs:
linux_headers→stage0-linux-headers-6.12.43: arm now builds its own kernel UAPI headers (previously the gen-0 slot was reused). The result matches that slot entry for entry, all 1992 files.binutils→binutils-2.41,glibc→glibc-bedrock-2.42,gcc→gcc-15.2.0-glibc: installed at/usr, the layout of the slots they replace.Cost
mip dumpagainst main: amd64 583 of 640 spec hashes change, arm64 550 of 638. The roots' content is largely identical, but a new Source sha moves every hash under it; this is the one world rebuild the plan budgets for.This CI run is the real test of the gen-4 roots on both arches. Draft until it is green.
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