fix(esp32): select only reached framework libraries

[zackees]

Closes #1449.

ESP32 previously compiled and linked every Arduino framework library. Arduino Matter retains global roots, so Blink pulled Matter, Wi-Fi/BLE, and ESP-IDF networking stacks into the image.

This uses the existing active-branch LDF resolver to select only framework libraries reachable from project and external-library translation units, or explicitly declared in lib_deps. It also passes effective -D/-U flags to selection and keeps all bundled include roots available only while compiling external libraries.

Validated:

• soldr cargo test -p fbuild-library -p fbuild-build-engine -p fbuild-build-esp
• Clean ESP32-S3 FastLED Blink with the patched daemon: 473,644 B flash / 81,104 B RAM; only libspi.a remains in fw_libs, and libmatter.a is absent.

Release bump: 2.5.24 → 2.5.25.

Coordinated with FastLED/FastLED#4474.

Summary by CodeRabbit

• Bug Fixes

  • Improved framework library selection so builds compile only libraries reachable from project code, declared dependencies, and external library sources.
  • Improved dependency detection for libraries brought in through external sources and include paths.
  • Ensured compiler-style define additions, updates, and removals are applied consistently during ESP32 builds.

• Tests

  • Added coverage for active library selection and effective build-define handling.

• Chores

  • Updated the release version to 2.5.25.

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⚙️ Run configuration

Configuration used: Repository: FastLED/fbuild/.coderabbit.yaml

Review profile: CHILL

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Run ID: 3f9ff67d-c1d1-4fde-904f-dffb7605f1dd

📥 Commits

Reviewing files that changed from the base of the PR and between 520d4c8 and 5efca03.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (9)

• Cargo.toml
• crates/fbuild-build-engine/src/framework_libs.rs
• crates/fbuild-build-engine/src/framework_libs_tests.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/build.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/framework_libs.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/helpers.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/tests.rs
• crates/fbuild-library/src/library/library_manager.rs
• pyproject.toml

📝 Walkthrough

Walkthrough

The ESP32 build now resolves active framework libraries from reachable project and external-library sources, effective defines, and declared dependencies. It compiles only the selected libraries. Library results now expose source files for dependency analysis.

Changes

Framework library selection

Layer / File(s)	Summary
Selection API and library inputs crates/fbuild-library/src/library/library_manager.rs, crates/fbuild-build-engine/src/framework_libs.rs, crates/fbuild-build-engine/src/framework_libs_tests.rs	LibraryResult now returns library source files. Framework selection returns complete Selection data and accepts external source and include-directory inputs. Tests cover reachable WiFi selection and external-source seeding.
ESP32 selection orchestration crates/fbuild-build-esp/src/esp32/orchestrator/build.rs, crates/fbuild-build-esp/src/esp32/orchestrator/helpers.rs, crates/fbuild-build-esp/src/esp32/orchestrator/tests.rs	The build combines framework and external include paths, applies effective define flags, and resolves framework libraries from project and external-library metadata. Tests cover define overlays.
Selected framework compilation and release metadata crates/fbuild-build-esp/src/esp32/orchestrator/framework_libs.rs, Cargo.toml, pyproject.toml	Framework compilation now consumes the selected library list while retaining archive caching and failure handling. Workspace and project versions change to 2.5.25.

Priority: ⬆️ High

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant ESP32_build
  participant external_libraries
  participant framework_selection_resolver
  participant framework_compiler
  ESP32_build->>external_libraries: compile with framework include paths
  external_libraries-->>ESP32_build: return source_files and include_dirs
  ESP32_build->>framework_selection_resolver: resolve with defines, project sources, and external metadata
  framework_selection_resolver-->>ESP32_build: return selected framework libraries
  ESP32_build->>framework_compiler: compile selected libraries

Loading

Possibly related PRs

• FastLED/fbuild#207: Adds the library-selection resolver that this change extends for active ESP32 framework selection.

Merge Risk: 🟡 Moderate · up to 520d4

Projects that unflag an inherited SDK define can select framework libraries for a different configuration than the one compiled, potentially omitting required code or retaining inactive libraries. Align define precedence before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 73.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 7 files. (2 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: ESP32 builds now select only reachable framework libraries.
Linked Issues check	✅ Passed	The changes address #1449. ESP32 now selects framework libraries from reachable project and external-library translation units, effective defines, and explicit lib_deps. It compiles only the selecte…
Out of Scope Changes check	✅ Passed	The changes remain within #1449. The resolver API, effective-define handling, external-library metadata, selective compilation, regression tests, and version changes all support the framework-library …

Full details: Docstring Coverage

Explanation

Docstring coverage is 73.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 7 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@crates/fbuild-build-esp/src/esp32/orchestrator/build.rs`:
- Around line 419-423: Update the library-selection define flow around
apply_effective_define_flags to keep SDK defines separate from user_flags:
filter inherited SDK defines using ctx.build_unflags first, then apply the user
build flags afterward so user definitions override filtered SDK values and
library selection matches the compiler’s final preprocessor state.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: FastLED/fbuild/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: e227544f-b103-4d3b-992d-2026f8451fc1

📥 Commits

Reviewing files that changed from the base of the PR and between 949dba0 and 520d4c8.

📒 Files selected for processing (9)

• Cargo.toml
• crates/fbuild-build-engine/src/framework_libs.rs
• crates/fbuild-build-engine/src/framework_libs_tests.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/build.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/framework_libs.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/helpers.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/tests.rs
• crates/fbuild-library/src/library/library_manager.rs
• pyproject.toml

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