This page documents build_flags options, specifically regarding to strings with embedded spaces.
However, none of the examples actually work.
https://docs.platformio.org/en/latest/projectconf/section_env_build.html
What is the proper, current method for defining a constant expression for text?
e.g.
platformio.ini
build_flags = -DWIFI_PASS="My\ pass'word"
results in error
arm-none-eabi-g++.exe: error: pass’word": Invalid argument
‘-DWIFI_PASS=“My password”’
results in error
arm-none-eabi-g++.exe: error: password": Invalid argument