Normally C++ errors make sense (you can search for the number in msdn or stackoverflow)… the major problem I have saw is when there is a missing semicolon, ) or } you get “weird” errrors, but you should get familiar with those errors, then they will make sense een if now not, at the end the compiler sintaxis is a finite state machine, somewhat very predictable, if it can compile source, then there is a error in the source for that FSM.
Yeah this happened to me. Spent 3 days trying to install VS2015
Awesome. This is really helpful, thank you! 
You should forget about error log in VisualStudio and instead focus on the Output window. There you’ll find the real errors.
–kg
Did visual studio 2017 have faster intelisense? Because i started a project a couple day ago and the intelisense seem lot fast than VS2015.
Yes there is a massive difference in compile times and intelisense speed in the latest version of UE4. It may be partially caused by VS 2017, although I wouldn’t give Microsoft much credit. Primarily this has to do with the recent conversion of UE4 to the Include-What-You-Use or IWYU model for compilation.
I’ve had nothing but trouble with intellisense in 2017 until I installed the VAX trial. Constant file parsing on edits was the norm. It seems the biggest reason for that was that I was still including Engine.h in my class headers though, and although I was using the occasional IWYU it was a source of constant headaches.
FWIW, this *also *works in VS2017 (at least in the community edition). This, combined with the faster compile times while using Include-What-You-Use, makes a day working in C++ so much more efficient than before!
Now Switch to Visual Studio Code for fast intellisense
Wow man, I was getting it sometimes working, sometimes not but this instantly made it work all the time! Super Thumbs up!
Where can we find this file? I found it in my respective UE_Engine_Version folder, but it seems to be read-only, even as admin. I think I could breach this somehow, but that doesn’t seem to be the right thing to do
How to do this in UE 4.24+ ?
I see these two files:
UnrealEngine\Engine\Source\Programs\UnrealBuildTool\ProjectFiles\VisualStudio\VCProject.cs
UnrealEngine\Engine\Source\Programs\UnrealBuildTool\ProjectFiles\VisualStudio\VCProjectFileGenerator.cs
But they dont contain the NMake line mentioned above…
Search for “// Write IntelliSense info” should be in line 969
add this line :
VCProjectFileContent.AppendLine(" <AdditionalOptions>/Yu</AdditionalOptions>");
before :
VCProjectFileContent.AppendLine(" </PropertyGroup>");
i didn’t Test this but this should how u can add that
My laptop is a Core i7 9th Gen, 32GB RAM and I was having issues with IntelliSense being incredibly slow with UE4/Visual Studio 2019 under Windows 10.
I then realized that antivirus software plays a role in this. Adding both UE4 and VS 2019 in the Windows Defender exclusion list fixed the problem, like so:
Add an exclusion to Windows Security
1 - Go to Start > Settings > Update & Security > Windows Security > Virus & threat protection.
2 - Under Virus & threat protection settings, select Manage settings, and then under Exclusions, select Add or remove exclusions.
3 - Select Add an exclusion, and then select from files, folders, file types, or process.
At the last step I chose **process **and added:
devenv.exe
UE4Editor.exe
Slowness problem is gone. No changes in settings for UE4 or VS 2019.
More on this: Add an exclusion to Windows Security (microsoft.com)
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