Construction Environments

The PlatformIO Build System uses the following construction environments to process a project:

• DefaultEnvironment() - the global construction environment.

  It is used for the Development Platforms and Frameworks build scripts, Pre & Post Actions, upload tools, Library Dependency Finder (LDF), and for other internal operations.

• Import("projenv") - the isolated construction environment used for processing the project source code in src_dir.

  Please note that any build_src_flags specified in “platformio.ini” (Project Configuration File) will be passed to the projenv and not to the DefaultEnvironment().

  Note

  1. The projenv is available only for the POST-type scripts (see Launch Types) and extraScript (see library.json).

  2. Flags passed to the global construction environment using PRE-type scripts will affect the projenv too.

• Import("env") - the current working construction environment.

  Imported env refers to the DefaultEnvironment() for scripts configured using the extra_scripts option in “platformio.ini” (Project Configuration File).

  If you use library.json and extraScript, the Import("env") refers to the library’s isolated environment from which a script was called (not to the global environemnt). Please use env = DefaultEnvironment() instead to access the global environemnt.

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Examples

my_pre_extra_script.py:

# Import the current working construction
# environment to the `env` variable.
# alias of `env = DefaultEnvironment()`
Import("env")

# Dump construction environment (for debug purpose)
print(env.Dump())

# append extra flags to global build environment
# which later will be used to build:
# - project source code
# - frameworks
# - dependent libraries
env.Append(CPPDEFINES=[
  "MACRO_1_NAME",
  ("MACRO_2_NAME", "MACRO_2_VALUE")
])

my_post_extra_script.py:

Import("env", "projenv")

# Dump global construction environment (for debug purpose)
print(env.Dump())

# Dump project construction environment (for debug purpose)
print(projenv.Dump())

# append extra flags to global build environment
# which later will be used to build:
# - frameworks
# - dependent libraries
env.Append(CPPDEFINES=[
  "MACRO_1_NAME",
  ("MACRO_2_NAME", "MACRO_2_VALUE")
])

# append extra flags to only project build environment
projenv.Append(CPPDEFINES=[
  "PROJECT_EXTRA_MACRO_1_NAME",
  ("ROJECT_EXTRA_MACRO_2_NAME", "ROJECT_EXTRA_MACRO_2_VALUE")
])