Build Configurations

There are 3 types (build_type) of build configuration in PlatformIO:


Default configuration. A “release” configuration of your firmware/program does not contain symbolic debug information and is optimized for the firmware size or speed (depending on Development Platforms)


A “test” configuration extends a build environment with PIO_UNIT_TESTING macro and with extra flags provided by the Unit Testing framework


A “debug” configuration of your firmware/program is compiled with full symbolic debug information and no optimization. Optimization complicates debugging because the relationship between source code and generated instructions is more complex.


If you need to control build flags that are specific for debug configuration please refer to debug_build_flags.

If you need to build a project in debug configuration, please use one of these options:


Debugging automatically switches to debug configuration when you do project debugging from PlatformIO IDE or use the pio debug command.

To avoid having Debugging rebuild the project, please create a separate build environment that defines build_type = debug. See the example below where the mydebug build environment will be used automatically by Debugging:

platform = ...
board = ...
framework = ...
... other common configuration

some_extra_options = ...

build_type = debug
some_extra_options = ...

Please note that you can set a default build environment per a project using the default_envs option in Section [platformio].