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  VS Arduino › Visual Micro › Installation & Troubleshooting › IntelliSense errors with std::vector on arduino-pico core 6.3.0
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Hot Topic (More than 8 Replies) IntelliSense errors with std::vector on arduino-pico core 6.3.0 (Read 496 times)
Sam Halvoe
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IntelliSense errors with std::vector on arduino-pico core 6.3.0
Oct 19th, 2026 at 4:22pm
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Hello (:

I am using the arduino-pico core 6.3.0.
I am able to compile and upload my program, but I get IntelliSense errors (see screenshot). The board properties output from compiling is attached too.
Can you have a look what the problem is, please?

Best regards
Sam Halvoe
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #1 - Oct 19th, 2026 at 4:26pm
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I just seen that I am using version 2026.708.2204 of Visual Micro. I will update to the lastest version and then post my findings with updated Visual Micro. (;
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #2 - Oct 19th, 2026 at 4:38pm
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I have updated my Visual Micro to latest release (2026.708.2207).
I run clean solution, rescan toolchain and build my program, but
the IntelliSense error persists.
The new board properties output from the build is attached.
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #3 - Oct 23rd, 2026 at 1:46pm
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Hello again,
is there anything missing in my report so someone can have a look at my problem?  Huh
  
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Tim@Visual Micro
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #4 - Oct 24th, 2026 at 8:46am
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sorry we missed this. will review next 24/48
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #5 - Oct 27th, 2026 at 2:24pm
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I saw this post:

26.0708.12 - Visual Studio 2022+

    Intellisense improvements inc. better c++ lang ver detection

Should I update to this version and try my use case again?
  
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Tim@Visual Micro
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #6 - Oct 27th, 2026 at 6:12pm
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No it doesn't resolve this. we have a fix being tested at the moment. it's a wider intellisense fix. should be available over the next 24/48. we will update this thread when it is available.
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #7 - Oct 27th, 2026 at 6:14pm
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Okay, thank you for your fast response.
I'm going to be patient now. Wink
  
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #8 - Oct 28th, 2026 at 6:57am
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try the LATEST here https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #9 - Oct 28th, 2026 at 2:30pm
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With the latest version (26.0708.14) I got this messages in output "Solution" when I open my solution:

Code
Select All
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Set environment variable TRACEDESIGNTIME = true and restart Visual Studio to investigate.

^^I'm not sure if this is a problem with Visual Studio or Visual Micro, but report it just in case (and have attached my build output with build properties).

I tested IntelliSense with the Arduino Pico core version 6.3.1 with...
Code (C++)
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std::vector<int> a;
std::variant<bool, int, Position> b;

...std::vector and std::variant are now recognized by IntelliSense.
Thank you very much Smiley
  
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Tim@Visual Micro
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #10 - Oct 28th, 2026 at 9:53pm
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.15 is the LATEST. Resolves the debug start launch of gdb.

https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES

It would be useful to switch on that environment variables in your design time intellisense warning report. Let's see what that is if possible. thanks

and attach or email the Printer.vcxproj
« Last Edit: Oct 29th, 2026 at 11:38am by Tim@Visual Micro »  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #11 - Oct 29th, 2026 at 2:15pm
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I set TRACEDESIGNTIME = true. These are the new messages from ouput "Solution":

Code
Select All
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.
error : Designtime build failed for project Printer.vcxproj' configuration 'Release|x64'. IntelliSense might be unavailable.
	Check *.designtime.log files in your %TEMP% directory.


I attached "Micro3dPrinter.vcxproj". (There is no "Printer.vcxproj" from the previous messages in my filesystem.) I attached the log files as zip archive.
If you need anything else to find the cause of the problem, let me know.

P.S.: I used the version 26.0708.14 of Visual Micro at the time this was written. Now I will install version 26.0708.15 of Visual Micro... (:
  
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #12 - Oct 29th, 2026 at 9:53pm
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Thanks, that "Designtime build failed for project" error was part of the new intellisense failing for the hardware you were using. Resolved in the .16 latest. 

https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES
  
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Sam Halvoe
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Re: IntelliSense errors with std::vector on arduino-pico core 6.3.0
Reply #13 - Oct 30th, 2026 at 6:40am
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Thank you. I will give it a try on sunday or monday. Have a great weekend! Smiley
  
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