Custom SCons command-line options
PlatformIO is built on top of the open-source software construction tool called SCons. SCons has many useful command-line options that control its behavior and may come in handy to know the exact internal processes happening in SCons when it builds a target. For example:
--dry-runconfigures SCons to print the commands that would be executed to build any target, but do not execute the commands.
--tree=allforces SCons to print file dependency tree including implicit and ignored dependencies
--debug=explainwill print an explanation of why SCons decides to (re-)build the targets it selects for building.
The list of available command-line options can be found in the official SCons documentation.
The easiest way to pass extra command-line options to the SCons build system used in
PlatformIO is via the external
SCONSFLAGS environment variable:
# POSIX shell
# Windows CMD
C:\Users\foo> set SCONSFLAGS=--dry-run