evidence · 2.9 KiB

minimal-probe-prebuild.md

Committed at docs/evidence/qtquick/minimal-probe-prebuild.md. This is what grounds the requirements that cite it.

Open raw source

Minimal Qt Quick probe: interrupted cross-build checkpoint

Observed 2026-09-23 at source 3d3d915fc57fffd0c328a70ebdb2b9b7e6512665 plus the opt-in source checkpoint in this worktree. This records source evaluation and a deliberately interrupted target build, not a successful probe cross-build or board observation.

qmlformat nix/qtquick-software-probe/Probe.qml    PASS host parser
qmllint nix/qtquick-software-probe/Probe.qml      PASS host parser
nix eval --impure --raw --expr 'let f = builtins.getFlake (toString ./.); p = f.inputs.nixpkgs.legacyPackages.x86_64-linux.pkgsCross.riscv64; in (p.callPackage ./nix/qtquick-software-probe/default.nix {}).drvPath'
  PASS target derivation evaluation
nix build --dry-run --no-link --impure --expr 'let f = builtins.getFlake (toString ./.); p = f.inputs.nixpkgs.legacyPackages.x86_64-linux.pkgsCross.riscv64; in p.callPackage ./nix/qtquick-software-probe/default.nix {}'
  PASS evaluation only; 40 derivations would build at this checkpoint

Pinned nixpkgs currently resolves Qt 6.11.2. The dry-run includes Qt SVG, ShaderTools, XCB and Vulkan-loader dependencies despite the probe’s requested software path and its Base/Declarative/Wayland direct inputs. Their presence does not prove a GPU context is required or used.

The exact command nix build .#qtquick-software-probe --max-jobs 1 --cores 4 --no-link --print-out-paths started at about 2026-09-23 22:36:35 -0500 against target derivation /nix/store/x6gpkh020snxwwvfz4fb6bwyzgdh1b5x-qtquick-software-probe-riscv64-unknown-linux-gnu-0.1.drv. After about 18 minutes, the coordinator prioritized goal-critical card and Rust builds. At 22:55:10 -0500 this task sent SIGINT to only its own Nix client process at a dependency boundary. The client exited and logged error: interrupted by the user; this is INTERRUPTED, not a failed Qt compile. The private full log is /tmp/k230-qtquick-probe-build.log.

The first dry-run listed 40 target derivations. A fresh dry-run after the interrupt listed 12 remaining, so 28 are already satisfied in the local store. The remainder includes the interrupted psqlODBC dependency and Qt Base, ShaderTools, QML Language Server, SVG, Declarative, Wayland, QML plugin wrapper, and the probe itself. No target Qt library or probe output has built yet. Completed dependency outputs are retained by Nix; the exact command can resume without a source change after the sole build slot is free.

The pinned Qt Declarative 6.11.2 source archive /nix/store/wv7whhmb9kmmjh0hcf10bl1w3vkmzvmv-qtdeclarative-everywhere-src-6.11.2.tar.xz has src/qml/configure.cmake JIT conditions only for i386, x86_64, ARM and ARM64. That predicts QML JIT OFF on riscv64, but no target configure summary has been produced. Actual output and unique closure bytes, target QV4/cache mode, runtime buffer path, input behavior and cost are unmeasured. Task 1.1 remains open until the narrow real build and evidence complete.