Release Notes

PlatformIO Core 6

Unlock the true potential of embedded software development with PlatformIO’s collaborative ecosystem, embracing declarative principles, test-driven methodologies, and modern toolchains for unrivaled success.

6.1.19 (2025-??-??)

• Fixed a regression issue where custom build flags were not properly reflected in the compile_commands.json file, ensuring accurate compilation database generation

6.1.18 (2025-03-11)

• Resolved a regression issue that prevented PIO Home from opening external links (issue #5084)

6.1.17 (2025-02-13)

• Introduced the PLATFORMIO_RUN_JOBS environment variable, allowing manual override of the number of parallel build jobs (issue #5077)

• Added support for tar.xz tarball dependencies (pull #4974)

• Ensured that dependencies of private libraries are no longer unnecessarily re-installed, optimizing dependency management and reducing redundant operations (issue #4987)

• Resolved an issue where the compiledb target failed to properly escape compiler executable paths containing spaces (issue #4998)

• Resolved an issue with incorrect path resolution when linking static libraries via the build_flags option (issue #5004)

• Resolved an issue where the --project-dir flag did not function correctly with the pio check and pio debug commands (issue #5029)

• Resolved an issue where the LDF occasionally excluded bundled platform libraries from the dependency graph (pull #4941)

6.1.16 (2024-09-26)

• Added support for Python 3.13

• Introduced the PLATFORMIO_SYSTEM_TYPE environment variable, enabling manual override of the detected system type for greater flexibility and control in custom build environments

• Enhanced internet connection checks by falling back to HTTPS protocol when HTTP (port 80) fails (issue #4980)

• Upgraded the build engine to the latest version of SCons (4.8.1) to improve build performance, reliability, and compatibility with other tools and systems (release notes)

• Upgraded the Doctest testing framework to version 2.4.11, the GoogleTest to version 1.15.2, and the Unity to version 2.6.0, incorporating the latest features and improvements for enhanced testing capabilities

• Corrected an issue where the incorrect public class was imported for the DoctestTestRunner (issue #4949)

6.1.15 (2024-04-25)

• Resolved an issue where the LDF couldn’t locate a library dependency declared via version control system repository (issue #4885)

• Resolved an issue related to the inaccurate detection of the Clang compiler (pull #4897)

6.1.14 (2024-03-21)

• Introduced the --json-output option to the pio test command, enabling users to generate test results in the JSON format

• Upgraded the build engine to the latest version of SCons (4.7.0) to improve build performance, reliability, and compatibility with other tools and systems (release notes)

• Broadened version support for the pyelftools dependency, enabling compatibility with lower versions and facilitating integration with a wider range of third-party tools (issue #4834)

• Addressed an issue where passing a relative path (--project-dir) to the pio project init command resulted in an error (issue #4847)

• Enhanced Static Code Analysis to accommodate scenarios where custom src_dir or include_dir are located outside the project folder (pull #4874)

• Corrected the validation of symlink:// package specifications , resolving an issue that caused the package manager to repeatedly reinstall dependencies (pull #4870)

• Resolved an issue related to the relative package path in the pio pkg publish command

• Resolved an issue where the LDF selected an incorrect library version (issue #4860)

• Resolved an issue with the hexlify filter in the device monitor command, ensuring proper representation of characters with Unicode code points higher than 127 (issue #4732)

6.1.13 (2024-01-12)

• Expanded support for SCons variables declared in the legacy format ${SCONS_VARNAME} (issue #4828)

6.1.12 (2024-01-10)

• Added support for Python 3.12

• Introduced the capability to launch the debug server in a separate process (issue #4722)

• Introduced a warning during the verification of MCU maximum RAM usage, signaling when the allocated RAM surpasses 100% (issue #4791)

• Drastically enhanced the speed of project building when operating in verbose mode (issue #4783)

• Upgraded the build engine to the latest version of SCons (4.6.0) to improve build performance, reliability, and compatibility with other tools and systems (release notes)

• Enhanced the handling of built-in variables in “platformio.ini” configuration file during Interpolation of Values (issue #4695)

• Enhanced PIP dependency declarations for improved reliability and extended support to include Python 3.6 (issue #4819)

• Implemented automatic installation of missing dependencies when utilizing a SOCKS proxy (issue #4822)

• Implemented a fail-safe mechanism to terminate a debugging session if an unknown CLI option is passed (issue #4699)

• Rectified an issue where ${platformio.name} erroneously represented None as the default project name (issue #4717)

• Resolved an issue where the COMPILATIONDB_INCLUDE_TOOLCHAIN setting was not correctly applying to private libraries (issue #4762)

• Resolved an issue where get_systype() inaccurately returned the architecture when executed within a Docker container on a 64-bit kernel with a 32-bit userspace (issue #4777)

• Resolved an issue with incorrect handling of the check_src_filters option when used in multiple environments (issue #4788)

• Resolved an issue where running pio project metadata resulted in duplicated “include” entries (issue #4723)

• Resolved an issue where native debugging failed on the host machine (issue #4745)

• Resolved an issue where custom debug configurations were being inadvertently overwritten in VSCode’s launch.json (issue #4810)

6.1.11 (2023-08-31)

• Resolved a possible issue that may cause generated projects for PlatformIO IDE for VSCode to fail to launch a debug session because of a missing “objdump” binary when GDB is not part of the toolchain package

• Resolved a regression issue that resulted in the malfunction of the Memory Inspection feature within PIO Home

6.1.10 (2023-08-11)

• Resolved an issue that caused generated projects for PlatformIO IDE for VSCode to break when the -iprefix compiler flag was used

• Resolved an issue encountered while utilizing the pio pkg exec command on the Windows platform to execute Python scripts from a package

• Implemented a crucial improvement to the pio run command, guaranteeing that the monitor target is not executed if any of the preceding targets, such as upload, encounter failures

• Cppcheck v2.11 with new checks, CLI commands and various analysis improvements

• Resolved a critical issue that arose on macOS ARM platforms due to the Python “requests” module, leading to a “ModuleNotFoundError: No module named ‘chardet’” (issue #4702)

6.1.9 (2023-07-06)

• Rectified a regression bug that occurred when the -include flag was passed via the build_flags option as a relative path and subsequently expanded (issue #4683)

• Resolved an issue that resulted in unresolved absolute toolchain paths when generating the Compilation database “compile_commands.json” (issue #4684)

6.1.8 (2023-07-05)

• Added a new --lint option to the pio project config command, enabling users to efficiently perform linting on the “platformio.ini” configuration file

• Enhanced the parsing of the “platformio.ini” configuration file to provide comprehensive diagnostic information

• Expanded the functionality of the library.json manifest by allowing the use of the underscore symbol in the keywords field

• Optimized project integration templates to address the issue of long paths on Windows (issue #4652)

• Refactored Unit Testing engine to resolve compiler warnings with “-Wpedantic” option (pull #4671)

• Eliminated erroneous warning regarding the use of obsolete PlatformIO Core when downgrading to the stable version (issue #4664)

• Updated the pio project metadata command to return C/C++ flags as parsed Unix shell arguments when dumping project build metadata

• Resolved a critical issue related to the usage of the -include flag within the build_flags option, specifically when employing dynamic variables (issue #4682)

• Removed PlatformIO IDE for Atom from the documentation as Atom has been deprecated

6.1.7 (2023-05-08)

• Introduced a new --sample-code option to the pio project init command, which allows users to include sample code in the newly created project

• Added validation for project working environment names to ensure that they only contain lowercase letters a-z, numbers 0-9, and special characters _ (underscore) and - (hyphen)

• Added the ability to show a detailed library dependency tree only in verbose mode, which can help you understand the relationship between libraries and troubleshoot issues more effectively (issue #4517)

• Added the ability to run only the device monitor when using the pio run -t monitor command, saving you time and resources by skipping the build process

• Implemented a new feature to store device monitor logs in the project’s logs folder, making it easier to access and review device monitor logs for your projects (issue #4596)

• Improved support for projects located on Windows network drives, including Network Shared Folder, Dropbox, OneDrive, Google Drive, and other similar services (issue #3417)

• Improved source file filtering functionality for the Static Code Analysis feature, making it easier to analyze only the code you need to

• Upgraded the build engine to the latest version of SCons (4.5.2) to improve build performance, reliability, and compatibility with other tools and systems (release notes)

• Implemented a fix for shell injection vulnerabilities when converting INO files to CPP, ensuring your code is safe and secure (issue #4532)

• Restored the project generator for the NetBeans IDE, providing you with more flexibility and options for your development workflow

• Resolved installation issues with PIO Remote on Raspberry Pi and other small form-factor PCs (issue #4425, issue #4493, issue #4607)

• Resolved an issue where the build_cache_dir setting was not being recognized consistently across multiple environments (issue #4574)

• Resolved an issue where organization details could not be updated using the pio org update command

• Resolved an issue where the incorrect debugging environment was generated for VSCode in “Auto” mode (issue #4597)

• Resolved an issue where native tests would fail if a custom program name was specified (issue #4546)

• Resolved an issue where the PlatformIO Debugging solution was not escaping the tool installation process into MI2 correctly (issue #4565)

• Resolved an issue where multiple targets were not executed sequentially (issue #4604)

• Resolved an issue where upgrading PlatformIO Core fails on Windows with Python 3.11 (issue #4540)

6.1.6 (2023-01-23)

• Added support for Python 3.11

• Added a new name configuration option to customize a project name (pull #4498)

• Made assets (templates, 99-platformio-udev.rules) part of Python’s module (issue #4458)

• Updated Clang-Tidy check tool to v15.0.5 with new diagnostics and bugfixes

• Removed dependency on the “zeroconf” package and install it only when a user lists mDNS devices (issue with zeroconf’s LGPL license)

• Show the real error message instead of “Can not remove temporary directory” when “platformio.ini” configuration file is broken (issue #4480)

• Fixed an issue with an incorrect test summary when a testcase name includes a colon (issue #4508)

• Fixed an issue when extends did not override options in the right order (issue #4462)

• Fixed an issue when pio pkg list and pio pkg uninstall commands fail if there are circular dependencies in the library.json manifests (issue #4475)

6.1.5 (2022-11-01)

• Added a new enable_proxy_strict_ssl setting to disable the proxy server certificate verification (issue #4432)

• Documented PlatformIO Core Proxy Configuration

• Speeded up device port finder by avoiding loading board HWIDs from development platforms

• Improved caching of build metadata in debug mode

• Fixed an issue when pio pkg install --storage-dir command requires PlatformIO project (issue #4410)

6.1.4 (2022-08-12)

• Added support for accepting the original FileNode environment in a “callback” function when using Build Middlewares (pull #4380)

• Improved device port finder when using dual channel UART converter (issue #4367)

• Improved project dependency resolving when using the pio project init --ide command

• Upgraded build engine to the SCons 4.4.0 (release notes)

• Keep custom “unwantedRecommendations” when generating projects for VSCode (issue #4383)

• Do not resolve project dependencies for the cleanall target (issue #4344)

• Warn about calling “env.BuildSources” in a POST-type script (issue #4385)

• Fixed an issue when escaping macros/defines for IDE integration (issue #4360)

• Fixed an issue when the “cleanall” target removes dependencies from all working environments (issue #4386)

6.1.3 (2022-07-18)

• Fixed a regression bug when opening device monitor without any filters (issue #4363)

6.1.2 (2022-07-18)

• Export a PIO_UNIT_TESTING macro to the project source files and dependent libraries in the Unit Testing mode

• Improved detection of Windows architecture (issue #4353)

• Warn about unknown device monitor filters (issue #4362)

• Fixed a regression bug when libArchive option declared in the library.json manifest was ignored (issue #4351)

• Fixed an issue when the pio pkg publish command didn’t work with Python 3.6 (issue #4352)

6.1.1 (2022-07-11)

• Added new monitor_encoding project configuration option to configure Device Monitor (issue #4350)

• Allowed specifying project environments for pio ci command (issue #4347)

• Show “TimeoutError” only in the verbose mode when can not find a serial port

• Fixed an issue when a serial port was not automatically detected if the board has predefined HWIDs

• Fixed an issue with endless scanning of project dependencies (issue #4349)

• Fixed an issue with LDF when incompatible libraries were used for the working project environment with the missed framework (pull #4346)

6.1.0 (2022-07-06)

• Device Manager

  • Automatically reconnect device monitor if a connection fails

  • Added new pio device monitor --no-reconnect option to disable automatic reconnection

  • Handle device monitor disconnects more gracefully (issue #3939)

  • Improved a serial port finder for Black Magic Probe (issue #4023)

  • Improved a serial port finder for a board with predefined HWIDs

  • Replaced monitor_flags with independent project configuration options: monitor_parity, monitor_eol, monitor_raw, monitor_echo

  • Fixed an issue when the monitor filters were not applied in their order (issue #4320)

• Unit Testing

  • Updated “Getting Started” documentation for GoogleTest testing and mocking framework

  • Export Unit Testing flags only to the project build environment (projenv, files in “src” folder)

  • Merged the “building” stage with “uploading” for the embedded target (issue #4307)

  • Do not resolve dependencies from the project “src” folder when the test_build_src option is not enabled

  • Do not immediately terminate a testing program when results are received

  • Fixed an issue when a custom pio test --project-config was not handled properly (issue #4299)

  • Fixed an issue when testing results were wrong in the verbose mode (issue #4336)

• Build System

  • Significantly improved support for Pre & Post Actions

    • Allowed to declare actions in the PRE-type scripts even if the target is not ready yet

    • Allowed library maintainers to use Pre & Post Actions in the library extraScript

  • Documented Stringification – converting a macro argument into a string constant (issue #4310)

  • Added new pio run --monitor-port option to specify custom device monitor port to the monitor target (issue #4337)

  • Added env.StringifyMacro(value) helper function for the Advanced Scripting

  • Allowed to Import("projenv") in a library extra script (issue #4305)

  • Fixed an issue when the build_unflags operation ignores a flag value (issue #4309)

  • Fixed an issue when the build_unflags option was not applied to the ASPPFLAGS scope

  • Fixed an issue on Windows OS when flags were wrapped to the temporary file while generating the Compilation database “compile_commands.json”

  • Fixed an issue with the LDF when recursively scanning dependencies in the chain mode

  • Fixed a “PermissionError” on Windows when running “clean” or “cleanall” targets (issue #4331)

• Package Management

  • Fixed an issue when library dependencies were installed for the incompatible project environment (issue #4338)

• Miscellaneous

  • Warn about incompatible Bash version for the Shell Completion (issue #4326)

6.0.2 (2022-06-01)

• Control Unit Testing verbosity with a new multilevel pio test -v command option (issue #4276)

• Follow symbolic links during searching for the unit test suites (issue #4288)

• Show a warning when testing an empty project without a test suite (issue #4278)

• Improved support for Asking for input (prompts)

• Fixed an issue when the build_src_flags option was applied outside the project scope (issue #4277)

• Fixed an issue with debugging assembly files without preprocessor (“.s”)

6.0.1 (2022-05-17)

• Improved support for the renamed configuration options (issue #4270)

• Fixed an issue when calling the built-in pio device monitor filters

• Fixed an issue when using Interpolation of Values and merging str+int options (issue #4271)

6.0.0 (2022-05-16)

Please check the Migration guide from 5.x to 6.0.

• Package Management

  • New unified Package Management CLI (pio pkg):

    • pio pkg exec - run command from package tool (issue #4163)

    • pio pkg install - install the project dependencies or custom packages

    • pio pkg list - list installed packages

    • pio pkg outdated - check for project outdated packages

    • pio pkg search - search for packages

    • pio pkg show - show package information

    • pio pkg uninstall - uninstall the project dependencies or custom packages

    • pio pkg update - update the project dependencies or custom packages

  • Package Manifest

    • Added support for “scripts” (issue #485)

    • Added support for multi-licensed packages using SPDX Expressions (issue #4037)

    • Added support for “dependencies” declared in a “tool” package manifest

  • Added support for symbolic links allowing pointing the local source folder to the Package Manager (issue #3348)

  • Automatically install dependencies of the local (private) project libraries (issue #2910)

  • Improved detection of a package type from the tarball archive (issue #3828)

  • Ignore files according to the patterns declared in “.gitignore” when using the pio package pack command (issue #4188)

  • Dropped automatic updates of global libraries and development platforms (issue #4179)

  • Dropped support for the “pythonPackages” field in “platform.json” manifest in favor of Extra Python Dependencies

  • Fixed an issue when manually removed dependencies from the “platformio.ini” configuration file were not uninstalled from the storage (issue #3076)

• Unit Testing

  • Refactored from scratch Unit Testing solution and its documentation

  • New: Test Hierarchy (issue #4135)

  • New: Doctest testing framework (issue #4240)

  • New: GoogleTest testing and mocking framework (issue #3572)

  • New: Semihosting (issue #3516)

  • New: Hardware Simulators for Unit Testing (QEMU, Renode, SimAVR, and custom solutions)

  • New: test build configuration

  • Added support for a custom testing framework

  • Added support for a custom testing command

  • Added support for a custom Unity library (issue #3980)

  • Added support for the socket:// and rfc2217:// protocols using test_port option (issue #4229)

  • List available project tests with a new pio test --list-tests option

  • Pass extra arguments to the testing program with a new pio test --program-arg option (issue #3132)

  • Generate reports in JUnit and JSON formats using the pio test command (issue #2891)

  • Provide more information when the native program crashed on a host (errored with a non-zero return code) (issue #3429)

  • Improved automatic detection of a testing serial port (issue #4076)

  • Fixed an issue when command line parameters (--ignore, --filter) do not override values defined in the “platformio.ini” configuration file (issue #3845)

  • Renamed the “test_build_project_src” project configuration option to the test_build_src

  • Removed the “test_transport” option in favor of the Custom “unity_config.h”

• Static Code Analysis

  • Updated analysis tools:

    • Cppcheck v2.7 with various checker improvements and fixed false positives

    • PVS-Studio v7.18 with improved and updated semantic analysis system

  • Added support for the custom Clang-Tidy configuration file (issue #4186)

  • Added ability to override a tool version using the platform_packages option (issue #3798)

  • Fixed an issue with improper handling of defects that don’t specify a source file (issue #4237)

• Build System

  • Show project dependency licenses when building in the verbose mode

  • Fixed an issue when LDF ignores the project lib_deps while resolving library dependencies (issue #3598)

  • Fixed an issue with calling an extra script located outside a project (issue #4220)

  • Fixed an issue when GCC preprocessor was applied to the “.s” assembly files on case-sensitive OS such as Window OS (issue #3917)

  • Fixed an issue when LDF ignores build_src_flags in the “deep+” mode (issue #4253)

• Integration

  • Added a new build variable (COMPILATIONDB_INCLUDE_TOOLCHAIN) to include toolchain paths in the compilation database (issue #3735)

  • Changed a default path for compilation database compile_commands.json to the project root

  • Enhanced integration for Qt Creator (issue #3046)

• Project Configuration

  • Extended Interpolation of Values with ${this} pattern (issue #3953)

  • Embed environment name of the current section in the “platformio.ini” configuration file using ${this.__env__} pattern

  • Renamed the “src_build_flags” project configuration option to the build_src_flags

  • Renamed the “src_filter” project configuration option to the build_src_filter

• Miscellaneous

  • Pass extra arguments to the native program with a new pio run --program-arg option (issue #4246)

  • Improved PIO Remote setup on credit-card sized computers (Raspberry Pi, BeagleBon, etc) (issue #3865)

  • Finally removed all tracks to the Python 2.7, the Python 3.6 is the minimum supported version.

PlatformIO Core 5

See PlatformIO Core 5.0 history.

PlatformIO Core 4

See PlatformIO Core 4.0 history.

PlatformIO Core 3

See PlatformIO Core 3.0 history.

PlatformIO Core 2

See PlatformIO Core 2.0 history.

PlatformIO Core 1

See PlatformIO Core 1.0 history.

PlatformIO Core Preview

See PlatformIO Core Preview history.