enable conditional compilation to reduce image size

[craiglink]

If you are open to it, I'd like to have these conditional compilation settings merged. For those of us with 6Pack External or 6x CNC Controllers there won't be any other stepper drivers. Additionally there isn't an OLED display easily added. Thus to save some space and allow room for other experimentation, I'd like to have the option to not include the supporting code and 2 external libraries in the build.

I don't see there being a need to build and share this binary for others to download, but I'll leave that decision to you :)

• enable conditional compilation for only External Drivers
• enable conditional compilation for OLED Display

The size of the wifi-external build is RAM: [== ] 19.5% (used 63772 bytes from 327680 bytes) Flash: [========= ] 86.6% (used 1703465 bytes from 1966080 bytes)

The size of the original wifi build RAM: [== ] 19.7% (used 64564 bytes from 327680 bytes) Flash: [========= ] 91.5% (used 1799137 bytes from 1966080 bytes)

[craiglink]

I’m not familiar with build_src_filter. I’ll take a look at it

[MitchBradley]

You can make a custom env like this

[env:fewer_motors]
extends = env:wifi
build_src_filter = ${env:wifi.build_src_filter} -<src/Motors/Solenoid.cpp> -<src/Motors/RcServo.cpp>

Then you can stash that change to platformio.ini and apply it anytime. That technique can be used to exclude any set of files that you want, without needing to bracket files with ifdefs or define the ifdef targets in a build rule.

[craiglink]

That works build_src_filter = ${common_esp32_base.build_src_filter} -<esp32/tmc*.c*> -<src/Motors/Dynamixel2.cpp> -<src/Motors/*Servo*.cpp> -<src/Motors/Solenoid.cpp> -<src/Motors/StepStick.cpp> -<src/Motors/TMC*.cpp> -<src/Motors/Trinamic*.cpp> -<src/Motors/UnipolarMotor.cpp>