Build_flags ignored with espidf esp-wrover-kit espressif32

Below is a screenshot of my 2 files, I have a working project but want to define the flag “HARDWARE_VERSION” from the outside.

On the right i got the ini file setting the flags as per the docs, but every time i build the project the error is thrown.

The left file is under include\CONFIGURATION.hpp (i set a lot of pin flags here)
the src/include folders are all default.

I googled for like 3 hours but all i can find is people asking “how to do this?” and the answer is always use “build_flags” but i haven’t found anyone where this just doesn’t produce the desired result…

The build_flags of selectionDev overwrite the definition of build_flags in env.

You have to do the interpolation correctly so that you have the sum of both flags.

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Ok, i thougtht they’d do that automatically ?
Edit: They don’t i just misread
Documentation here Section [env] — PlatformIO latest documentation

Adding this definition would result in:

; Please visit documentation for the other options and examples

platform = espressif32
board = esp-wrover-kit
framework = espidf
monitor_speed = 115200
monitor_filters = esp32_exception_decoder 
board_build.partitions = partition_table.csv

build_flags =
upload_port = /dev/ttyUSB*
monitor_port = /dev/ttyUSB*

build_type = debug
build_flags = 
    '-D BACKEND_SERVER=\\"http:\\"'

build_type = release
build_flags = 
    '-D BACKEND_SERVER=\\"https://\\"'

but the end result when building is the same, still undefined

Well the screenshot is also complaining about "missing terminating " so let’s rewrite the string constant to how the docs says it

replace that with

    '-D BACKEND_SERVER="http:"'

Yeah but that section of the docs deals with strings in particular, which isn’t what I need here anyways… I am not even using that variable.
I removed it now but the end result is the same either way.

Okay but… you only define HARDWARE_VERSION, not CONFIG_HARDWARE_VERSION, so that that isn’t found is understandable.

Usually CONFIG_ macros are generated from settings in the menuconfig.

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Oh good god i am stupid, ok thanks!

So my error was just the incorrect merging of the environments.
I first thought that maybe the macros got the CONFIG_ automatically, but this makes a lot more sense.

Thanks a lot for your help !