platformio/platformio-core

Bug: build_src_flags has an impact on lib_deps

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#5245 opened on Aug 31, 2025

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build systemhelp wanted

Description

$ pio --version PlatformIO Core, version 6.1.19a2

see my https://github.com/platformio/platformio-core/issues/4667#issuecomment-3240460103

in particular this is the case for "-Wpedantic" set in build_src_flags

Contributor guide

Tech stack
python
Domain
build system
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Familiarity with PlatformIO SCons build systemUnderstanding of build flags
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate how build src flags interact with lib deps in PlatformIO's SCons build scripts. Examine the code in platformio/builder/main.py or similar files to understand the precedence of flags. The issue references comment https://github.com/platformio/platformio core/issues/4667#issuecomment 3240460103 which may provide additional context. Look for where build src flags are applied and how they might inadvertently affect library dependency flags.