HybridCompile: add Option to enable LTO for Arduino part #338
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Removed LTO management for BUILD_FLAGS and related checks.
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Important Review skippedAuto reviews are disabled on base/target branches other than the default branch. Please check the settings in the CodeRabbit UI or the You can disable this status message by setting the WalkthroughThe changes implement Link-Time Optimization (LTO) flag management for HybridCompile Arduino builds. When Changes
Sequence DiagramsequenceDiagram
participant Arduino as arduino.py
participant CompMgr as ComponentManager
participant BuildScript as pioarduino-build.py
Arduino->>Arduino: Detect -fno-lto in BUILD_UNFLAGS
Arduino->>Arduino: Set flag_lto = True
rect rgb(240, 248, 255)
note right of Arduino: Lifecycle Point 1 & 2
Arduino->>CompMgr: remove_no_lto_flags()
CompMgr->>BuildScript: Read file
CompMgr->>BuildScript: Remove all -fno-lto occurrences
CompMgr->>BuildScript: Sanitize syntax (commas/brackets)
CompMgr->>BuildScript: Write back
CompMgr-->>Arduino: Return True/False
end
rect rgb(240, 255, 240)
Arduino->>CompMgr: add_lto_flags()
CompMgr->>BuildScript: Read file
CompMgr->>BuildScript: Insert -flto into CCFLAGS, CFLAGS, CXXFLAGS, LINKFLAGS
CompMgr->>BuildScript: Write back if modified
CompMgr->>CompMgr: Print notification
CompMgr-->>Arduino: Return True/False
end
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Actionable comments posted: 3
🧹 Nitpick comments (2)
builder/frameworks/component_manager.py (1)
1275-1310: Consider using the logger and adding validation.The method bypasses the class's logger instance and prints directly to stdout, which is inconsistent with other methods in ComponentManager (e.g.,
_cleanup_removed_components,_batch_remove_cpppath_entries). Additionally, no validation is performed on the modified content before writing it back.Consider these improvements:
def remove_no_lto_flags(self) -> bool: """ Remove all -fno-lto flags from pioarduino-build.py. Removes all occurrences of -fno-lto from CCFLAGS, CFLAGS, CXXFLAGS, and LINKFLAGS in the Arduino build script. Returns: bool: True if successful, False otherwise """ build_py_path = str(Path(self.config.arduino_libs_mcu) / "pioarduino-build.py") if not os.path.exists(build_py_path): - print(f"Warning: pioarduino-build.py not found at {build_py_path}") + self.logger.log_change(f"Warning: pioarduino-build.py not found at {build_py_path}") return False try: with open(build_py_path, 'r', encoding='utf-8') as f: content = f.read() # Remove all -fno-lto flags modified_content = re.sub(r'["\']?-fno-lto["\']?,?\s*', '', content) # Clean up any resulting empty strings or double commas modified_content = re.sub(r',\s*,', ',', modified_content) modified_content = re.sub(r'\[\s*,', '[', modified_content) modified_content = re.sub(r',\s*\]', ']', modified_content) + # Basic validation + if not modified_content or len(modified_content) < len(content) * 0.5: + self.logger.log_change("Warning: Modified content looks suspicious, aborting") + return False + with open(build_py_path, 'w', encoding='utf-8') as f: f.write(modified_content) + self.logger.log_change("Removed -fno-lto flags from build script") return True except (IOError, OSError) as e: - print(f"Error removing -fno-lto flags: {e}") + self.logger.log_change(f"Error removing -fno-lto flags: {e}") return Falsebuilder/frameworks/arduino.py (1)
602-603: Consider adding a comment to clarify the counterintuitive logic.The logic where
-fno-ltoinbuild_unflagsenables LTO is counterintuitive. A brief comment would help future maintainers understand this design choice.+ # Check if user wants to enable LTO for Arduino part by unflagging -fno-lto if '-fno-lto' in build_unflags: flag_lto = True
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📒 Files selected for processing (2)
builder/frameworks/arduino.py(3 hunks)builder/frameworks/component_manager.py(1 hunks)
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🧠 Learnings (1)
📓 Common learnings
Learnt from: Jason2866
Repo: pioarduino/platform-espressif32 PR: 0
File: :0-0
Timestamp: 2025-09-23T12:35:35.508Z
Learning: For the pioarduino/platform-espressif32 project, Jason2866 has explicitly instructed to NEVER create issues or PRs outside of his repositories (pioarduino/*). All issue and PR creation must be strictly limited to his own repositories only, never in upstream or other repositories.
Learnt from: Jason2866
Repo: pioarduino/platform-espressif32 PR: 0
File: :0-0
Timestamp: 2025-09-23T12:35:35.508Z
Learning: For the pioarduino/platform-espressif32 project, Jason2866 has explicitly instructed to NEVER create issues or PRs outside of his repositories (pioarduino/*). All issue and PR creation must be strictly limited to his own repositories only, never in upstream or other repositories.
Learnt from: Jason2866
Repo: pioarduino/platform-espressif32 PR: 281
File: builder/frameworks/component_manager.py:1047-1054
Timestamp: 2025-09-04T15:27:18.112Z
Learning: In the pioarduino/platform-espressif32 project, Jason2866 prefers not to add guard checks for missing arduino_libs_mcu in backup operations, preferring to let the operation proceed rather than silently skip when the directory might be missing.
Learnt from: Jason2866
Repo: pioarduino/platform-espressif32 PR: 268
File: builder/penv_setup.py:87-96
Timestamp: 2025-08-26T14:52:29.044Z
Learning: For the pioarduino/platform-espressif32 project, Jason2866 prefers to trust system executables when falling back to PATH-based command resolution (like "uv"), rather than implementing additional validation checks for security concerns.
🪛 Ruff (0.14.4)
builder/frameworks/component_manager.py
1306-1306: Consider moving this statement to an else block
(TRY300)
1332-1332: Local variable original_content is assigned to but never used
Remove assignment to unused variable original_content
(F841)
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- GitHub Check: build (macos-15, examples/espidf-peripherals-usb)
- GitHub Check: build (macos-15, examples/espidf-coap-server)
- GitHub Check: build (macos-15, examples/espidf-blink)
- GitHub Check: build (macos-15, examples/tasmota)
- GitHub Check: build (macos-15, examples/espidf-arduino-blink)
- GitHub Check: build (windows-latest, examples/arduino-wifiscan)
- GitHub Check: build (windows-latest, examples/arduino-blink)
🔇 Additional comments (1)
builder/frameworks/arduino.py (1)
535-535: LGTM! Clean initialization of the LTO flag.The flag initialization is consistent with other flag patterns in the file.
Add check for enabling LTO in Arduino build process.
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@Jason2866 : so to summarize, LTO becomes activated when LTO flag is removed ? 😆 |
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@mathieucarbou LTO gets activated since the |
Description:
To enable LTO for the Arduino HybridCompile part add in
platformio.iniin theenv:Do not set anything regarding
LTOinbuild_flagsthis would enableLTOfor the espidf HybridCompile part of the Arduino Libs! The espidf framework does not compile successfully with enabledLTO@mathieucarbou fyi
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