Undefined Warning for MICROPY_ROM_TEXT_COMPRESSION When Building porting Project with CMake

[cjkzwe]

I’m porting micropython to a new MCU which toolchain uses CMake. However, I’ve run into a warning that states “MICROPY_ROM_TEXT_COMPRESSION” is not defined. The warning message is as follows:

warning: “MICROPY_ROM_TEXT_COMPRESSION” is not defined, evaluates to 0 [-Wundef] 113 | #if MICROPY_ROM_TEXT_COMPRESSION | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Being new to this project, I’m unsure of how the “MICROPY_ROM_TEXT_COMPRESSION” option works. I’ve seen in other porting projects’ Makefiles that there’s a line like “MICROPY_ROM_TEXT_COMPRESSION ?=1”. Could someone please guide me on how to achieve the same effect in CMake? How do I properly define and set this macro in the project?

Furthermore, I would like to understand the purpose and implications of enabling or disabling this macro in the context of MicroPython.

Any help or insights would be greatly appreciated!

[cjkzwe]

I found that the code for generating the files associated with this macro are missing in mkrules.cmake compared to mkrules.mk.

# Compressed error strings.
$(HEADER_BUILD)/compressed.split: $(HEADER_BUILD)/qstr.i.last
	$(ECHO) "GEN $@"
	$(Q)$(PYTHON) $(PY_SRC)/makeqstrdefs.py split compress $< $(HEADER_BUILD)/compress _
	$(Q)$(TOUCH) $@

$(HEADER_BUILD)/compressed.collected: $(HEADER_BUILD)/compressed.split
	$(ECHO) "GEN $@"
	$(Q)$(PYTHON) $(PY_SRC)/makeqstrdefs.py cat compress _ $(HEADER_BUILD)/compress $@