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  VS Arduino › Visual Micro › Installation & Troubleshooting › Preprocessor seems to fail on new install
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Bob4K
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Preprocessor seems to fail on new install
Feb 13th, 2026 at 7:25pm
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Hi,

I switched from Windows 10 Pro to Windows 10 IoT Enterprise.

I bought an upgrade to Visual Micro to install the latest version on VS2026:

Visual.Micro.Arduino.Studio_2025_1009_2204.vsix

I installed the required libraries and the:

Version: 2.3.7
Date: 2025-12-17T16:05:25.389Z
CLI Version: 1.3.1

IDE

The last sketch I was working before still compiles nicely with the IDE:

Sketch uses 90244 bytes (34%) of program storage space. Maximum is 262144 bytes.
Global variables use 14276 bytes (43%) of dynamic memory, leaving 18492 bytes for local variables. Maximum is 32768 bytes.

But fails with VM with errors like:

GoldCont.ino: 452:0: error: unterminated #ifdef

These are plain wrong, there is no mismatch.

If I look at the cpp generated file in C:\Users\m1\AppData\Local\Temp\VMBuilds\GoldCont\unor4wifi\Debug\
the file is wrong, #if structure is mangled.

I tried to set the IDE to 2.0 (see attached image) but that does not stick, it reverts to 1.6/1.8

I tested also VS2022, same errors.

What can I do to solve that?
  
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Simon@Visual Micro
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Re: Preprocessor seems to fail on new install
Reply #1 - Feb 18th, 2026 at 10:07pm
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Sorry for the delayed response.

Firstly can you change the Build Configuration to "Release" which will turn off the Visual Micro Serial Debugger (which is not present in the Arduino IDE).

If this still fails can you email or attach a copy of the INO file and also the build log from the Arduino IDE with the File > Preferences > Verbose Output During Compile enabled?
  
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Bob4K
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Re: Preprocessor seems to fail on new install
Reply #2 - Feb 18th, 2026 at 10:33pm
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Simon@Visual Micro wrote on Feb 18th, 2026 at 10:07pm:
Sorry for the delayed response.


No problem at all!


Quote:
Firstly can you change the Build Configuration to "Release" which will turn off the Visual Micro Serial Debugger (which is not present in the Arduino IDE).

If this still fails can you email or attach a copy of the INO file and also the build log from the Arduino IDE with the File > Preferences > Verbose Output During Compile enabled?


That works now:


Program GoldCont size: 99420 bytes (used 38% of a 262144 byte maximum) (8.26 secs)

Question before I upload: can I still set up breakpoints in "Release" mode?

If not, how can I test aside using Serial.println()?
  
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Simon@Visual Micro
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Re: Preprocessor seems to fail on new install
Reply #3 - Feb 18th, 2026 at 10:39pm
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Glad that has helped, can you email us the iNO file so we can work out what has tripped up the Serial Debuggers code injection in this case?

Yes you can set them up, they just aren't injected into the compiled code unless the Serial Debugger is enabled (i.e. Debug configuration with standard settings).

You can also use the Hardware Debugging for the Uno R4 with no extra probe or wiring, which does reduce some features (@plot charts, hit count break points, a limited number of break and traces, no WiFi support), but you can evaluate variables and change breakpoints on the fly whilst running the debugger.

Hardware Debugging Video: https://www.youtube.com/watch?v=AFqqiqxGxL0
Hardware Debugging Documentation: https://www.visualmicro.com/page/UnoR4-Debugging.aspx
  
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Bob4K
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Re: Preprocessor seems to fail on new install
Reply #4 - Feb 18th, 2026 at 10:51pm
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Here is the ino.

Thanks for the links, I'll look at then tomorrow.
  
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