Infinite recursion from platformio.ini

[jcw]

What kind of issue is this?

• PlatformIO Core.
  If you’ve found a bug, please provide an information below.

I can get PIO to very verbosely error out in Python due to infinite recursion, using a setting such as this:

[stm32]
build_flags = ${stm32.build_flags} -DSTM32F1 -g

It's obviously my mistake, but it's easily made when moving settings around between sections which use extends = ... and it was not immediately obvious what the cause of this error was.

Perhaps a quick check before doing the expansion could be added to help find such mistakes more easily.

(Using PIO 5.1.0, MacOS Big Sur, Intel)

[ivankravets]

Thanks for the report! Please re-test with pio upgrade --dev.