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[Minor Feature] Install modern Clang for improved TSan and fuzzing #282

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opened 2026-03-08 03:19:50 +00:00 by john · 0 comments
john commented 2026-03-08 03:19:50 +00:00
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Context

The build system currently uses GCC 12.2.0 (Debian 12 default). This is adequate for ASan and UBSan, but:

  • TSan has improved substantially in Clang 16–18, particularly around suppression handling and false-positive reduction with atomics — exactly what free-threaded CPython uses internally
  • Atheris fuzzing (see #283) requires a Clang build with coverage instrumentation
  • GCC 12 doesn't support -fno-sanitize=function (Clang-only UBSan check), so we already have a compiler-detection workaround in CMakeLists.txt

Proposal

  1. Install Clang 18+ (available via LLVM apt repository for Debian 12)
  2. Make the compiler selectable via env var or CMake option: CC=clang CXX=clang++ make asan
  3. Update TSan targets to prefer Clang when available

Value

  • More accurate TSan results for --disable-gil work
  • Enables coverage-guided fuzzing
  • -fno-sanitize=function works natively (no workaround needed)

Related

  • #281 (free-threaded + TSan targets)
  • #279 (memory safety audit meta-issue)
## Context The build system currently uses GCC 12.2.0 (Debian 12 default). This is adequate for ASan and UBSan, but: - TSan has improved substantially in Clang 16–18, particularly around suppression handling and false-positive reduction with atomics — exactly what free-threaded CPython uses internally - Atheris fuzzing (see #283) requires a Clang build with coverage instrumentation - GCC 12 doesn't support `-fno-sanitize=function` (Clang-only UBSan check), so we already have a compiler-detection workaround in CMakeLists.txt ## Proposal 1. Install Clang 18+ (available via LLVM apt repository for Debian 12) 2. Make the compiler selectable via env var or CMake option: `CC=clang CXX=clang++ make asan` 3. Update TSan targets to prefer Clang when available ## Value - More accurate TSan results for `--disable-gil` work - Enables coverage-guided fuzzing - `-fno-sanitize=function` works natively (no workaround needed) ## Related - #281 (free-threaded + TSan targets) - #279 (memory safety audit meta-issue)
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Alpha Release Requirement

This issue is a blocker to 0.1 Alpha release of McRogueFace.

  
Bugfix

   
Demo Target

Functionality to demonstrate; Depends on new features, but this issue isn't for writing them.

  
Documentation

   
Major Feature

Significant time and effort required.

  
Minor Feature

Some effort required to create or overhaul functionality.

  
priority:tier1-active

Current development focus - critical path to v1.0

  
priority:tier2-foundation

Important foundation work - not blocking v1.0

  
priority:tier3-future

Future features - deferred until after v1.0

  
priority:tier4-deferred

   
Refactoring & Cleanup

no new functionality, just improving the codebase.

  
system:animation

Animation and property interpolation

  
system:documentation

Documentation infrastructure

  
system:grid

Grid system and spatial containers

  
system:input

Input handling and events

  
system:performance

Performance optimization and profiling

  
system:procgen

Procedural Generation (Noise, BSP, Heightmap)

  
system:python-binding

Python/C++ binding layer

  
system:rendering

Rendering pipeline and visuals

  
system:ui-hierarchy

UI component hierarchy and composition

  
Tiny Feature

quick and easy - a few lines or with little interconnection around the codebase

  
workflow:blocked

Blocked by other work - waiting on dependencies

  
workflow:needs-benchmark

Needs performance testing and benchmarks

  
workflow:needs-documentation

Needs documentation before or after implementation

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john/McRogueFace#282
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