[FEATURE] add -D ARDUINO_PARTITION_xxx build flag to platform.txt

[tobozo]

Proposition: adding -DARDUINO_PARTITION_{build.partitions} flag to make the build partition information available at compile time.

Use case examples:

#if defined ARDUINO_PARTITION_default
  // prevent compilation
  #error "This sketch needs 'Minimal SPIFFS' partition scheme to compile" 
  // or disable sketch features that need flash space
  #define USE_HUGE_BITMAP_IMAGES false
#endif

#if !defined ARDUINO_PARTITION_default_ffat
  #error "This sketch needs 'Default 4MB with ffat (1.2MB APP/1.5MB FATFS)' partition scheme to compile" 
#endif

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[me-no-dev]

This feature should also be added to pio the scripts. For ESP32 that is here:https://github.com/espressif/arduino-esp32/blob/master/tools/platformio-build-esp32.py#L313

[tobozo]

Does this seem correct?

    '\\"ARDUINO_PARTITION_%s\\"' % env.BoardConfig().get("build.partitions").replace('"', "")

[me-no-dev]

maybe something like this? can you test it?

"ARDUINO_PARTITION_%s" % env.BoardConfig().get("build.partitions", "default.csv").replace('.csv', "")

[me-no-dev]

@ivankravets @valeros could you propose what is correct here?

[valeros]

Hi guys, the variant @me-no-dev suggested looks good, so in the script it should look something like this:

env.Append(
    CPPDEFINES=[
       ...
       "ARDUINO_PARTITION_%s" % env.BoardConfig().get("build.partitions", "default.csv").replace(".csv", "")
   ]
)