December 2025 monthly summary for CTSRD-CHERI/cheribuild: Delivered a targeted build-system cleanup by removing the unused QEMU_CHERI_PATH variable to prevent x86 QEMU path conflicts, and dropped support for the deprecated variable to simplify configuration. This fix reduces build failures, streamlines cross-architecture testing, and improves developer onboarding. The change enhances build reliability and sets the stage for future path normalization across architectures.

November 2025 highlights for CTSRD-CHERI/cheribuild: Delivered broader platform support and reliability by enabling 0.9.3-era QEMU/OpenSBI workflows, expanding Linux/kernel build capabilities with GCC, and strengthening build hygiene. Implemented OpenSBI integration fixes and robust QEMU/BBl path handling, improved Python typing compatibility, and enhanced robustness of key components. The work emphasizes business value through reduced build failures, cross-platform support, and maintainable tooling.

October 2025 (2025-10) monthly summary for CTSRD-CHERI/cheribuild Key features delivered: - Simplified compiler project resolution and Linux target metadata: streamlined _get_compiler_project, simplified Linux target infos, and cleaned up linux target definitions to reduce complexity and accelerate Linux-target iterations. - CHERI-RISC-V messaging and Linux target wiring: improved version compatibility messaging, ensured RISCV_CHERI is set for relevant targets, and simplified LaunchCheriLinux.dependencies() for reliability. - Boot-up support for upstream Linux on QEMU: added capability to boot upstream Linux in QEMU, widening test coverage and validation routes. - Command-line parsing enhancements: improved handling of list-type command line arguments and added AppendConstListAction argparse action to reduce user errors and improve UX. - Topological sort refactor for target sorting: migrated to a topological sort for target ordering, improving build correctness and giving more predictable, scalable growth. Major bugs fixed: - Linux install dir fixes and Morello suffix: corrected install directory setup for compiler-rt builtins and fixed duplicate -linux suffix in Morello Linux targets. - Musl: use CC properties: replaced hardcoded clang with compiler-provided CC properties for musl builds. - Linux: RISC-V LLVM workaround and sysroot tweaks: worked around a RISC-V LLVM assertion and avoided appending the target triple to the Linux sysroot. - Linux: RISC-V boot/runtime improvements and target updates: updated linux-riscv64-purecap to 0.9.3, ensured OpenSBI BIOS usage when launching Linux, and fixed run-minimal-linux launcher for plain RISC-V. - Python SyntaxWarning fix: resolved a SyntaxWarning with newer Python versions. Overall impact and accomplishments: - Achieved more maintainable, reliable builds across CHERI/Linux targets, clearer user messaging, expanded QEMU/Linux testing coverage, and stronger CI tooling. The changes reduce build fragility, improve developer productivity, and position cheribuild for easier future enhancements via declarative config options and safer typing. Technologies/skills demonstrated: - Advanced Python typing and static analysis (typing.final, casts, import hygiene) and typing improvements across modules. - Argparse enhancements and CLI UX improvements (AppendConstListAction). - Algorithms and software architecture: topological sort refactor for target ordering and broader refactor toward declarative ConfigOption usage. - Linux/RISC-V tooling integration: improved target wiring, patch management, and QEMU launch flows. - CI tooling and static analysis improvements to improve reliability and feedback loops.

Monthly summary for CTSRD-CHERI/cheribuild (2025-09). Focused on delivering CHERI-RISC-V std093/experimental target support, enforcing ISA variants in OpenSBI/U-Boot, and improving tooling for QEMU/GDB and compiler targeting. The work reduces build failures, improves target reliability, and enhances developer productivity through standardized targets, centralized checks, and better IDE integration.

Monthly work summary for CTSRD-CHERI/cheribuild (2025-08). Focused improvements on build reliability, modularity, and enabling performance benchmarking in CHERI purecap mode. Delivered targeted fixes and enhancements with measurable business value for CI stability and benchmarking readiness.

July 2025: Delivered focused improvements in cheribuild (CTSRD-CHERI/cheribuild) across cross-compilation, build system integration, and image tooling. Key outcomes include improvements to RISC-V FP ABI handling, respect for user-provided compilers for LLVM runtimes and static linking, QEMU build stability tweaks, safer disk-image traversal, and broader type-safety across modules. These changes reduce cross-target build failures, improve reproducibility, and enhance maintainability with measurable business value in developer efficiency and build reliability.

June 2025 monthly performance summary for CTSRD-CHERI/cheribuild focusing on delivering robust repository operations, hardening cross-compilation workflows, and improving code health. Major outcomes include supporting tag-based overrides for repository checkouts, hardening build-time and cross-compilation configurations, aligning dependencies with upstream sources, and upgrading tooling for maintainability. These changes reduce build failures, improve reproducibility across platforms, ensure upstream alignment, and set the stage for faster, safer feature delivery.

May 2025: Delivered key cross-architecture build portability improvements for CTSRD-CHERI/cheribsd by addressing ZFS build compatibility on Morello/LLVM toolchains, reducing environment-specific build failures and strengthening CI coverage.

April 2025 monthly summary for CTSRD-CHERI/cheribuild focusing on feature delivery, bug fixes, and impact. Delivered CHERI-enabled RISC-V workflows, stabilized QEMU testing harness, and strengthened code quality and tooling, expanding CHERI coverage and improving maintainability.

March 2025: Delivered significant hardening of cheribuild's QEMU build/test pipeline and packaging documentation, yielding more deterministic builds, fewer flaky tests, and easier packaging maintenance. Key outcomes include hardened QEMU build/test infrastructure with improved determinism and error handling; reliability improvements for test reporting; compatibility and invocation cleanup for GCC/QEMU; sanitizer-based testing expansion; and centralized packaging install guidance across managers.

February 2025 monthly summary for CTSRD-CHERI repositories, focusing on delivering stability, typing and build reliability, and CI efficiency across cheribuild and cheribsd. The work emphasized business value through more robust tooling, faster feedback loops, and cross-version compatibility.

January 2025 monthly summary: Expanded cross-platform capabilities and strengthened build reliability across cheribuild and cheribsd. Delivered Arm32 Little Kernel (lk) build support, modernized toolchains with LLVM17-based CHERI libc++ updates, and added LoongArch support in libunwind. Implemented reliability improvements by removing a broken QEMU --disable-pie flag and hardening the libc++ detection logic in scenarios where git history is unavailable. These changes enable broader testing, smoother upgrades, and more stable CI, reducing downstream debugging time for developers and release engineering.

December 2024 monthly summary for CTSRD-CHERI/cheribuild: Delivered key cross-platform build reliability improvements, prepared baremetal-like test workflows, and enhanced packaging consistency, underpinned by stronger CI and developer tooling. These efforts reduced cross-LLVM 17 libc++ build friction, enabled LLVM testsuite runs on baremetal-like environments, and standardized rootfs handling across targets, while elevating code quality and maintainability.

November 2024 monthly summary for CTSRD-CHERI/cheribsd focused on improving build reliability for libc++ under assertion configurations. A critical fix was implemented to ensure the libc++ build process includes assert.cpp when libc++-internal assertions are enabled, enabling proper compilation and testing of assertions across configurations. This directly reduces CI/build failures and accelerates validation of assertion-related changes in the CHERI libc++ path.

Month: 2024-08. Concise monthly summary for CTSRD-CHERI/cheribuild highlighting key features delivered, major bugs fixed, and overall impact for the period. Focused on stabilizing the Qt tooling workflow and improving build reliability to support Qt-based projects and CI pipelines.

Month: 2023-10 — CTSRD-CHERI/cheribuild delivered two feature updates focused on compatibility and code quality. Changes are tracked in these commits: cb2aa2c274bc6084f98bf4f13e3c544e6bf08af6 (Update minimum Python version from 3.6 to 3.8) and c076906e6184873ff92a9b6f2af0bc01a142e23b (Use functools.cached_property instead of the local copy). Summary of impact: - Improved deployment readiness by aligning with current Python ecosystems. - Enhanced runtime performance and readability through standard library usage. - Maintained a strong focus on maintainability to ease future enhancements. Major bugs fixed: None reported this month. Technologies/skills demonstrated: Python version management, performance optimization, refactoring to use standard library features, and codebase maintainability.

November 2022 monthly work summary for CTSRD-CHERI/cheribuild. Focused on stabilizing build correctness and performance by ensuring LTO flag propagation works end-to-end, preserving -mllvm flags to the linker during Link Time Optimization (LTO).

Monthly summary for 2022-10 focused on CTSRD-CHERI/cheribuild. Delivered a new SPEC2017 Benchmark Target with configuration options and installation workflow for SPEC2017 benchmarks, expanding benchmarking coverage and usability within the cheribuild suite. No major bugs reported this month; any minor issues were addressed in future iterations. Overall, the work strengthens performance evaluation capabilities, improves reproducibility, and enhances the business value of benchmarks by enabling consistent, repeatable runs.