Intellisense errors in Unreal C++ project: "Cannot resolve symbol '__builtin_expect'"

Hello, 

Thank you for contacting Rider support. 
We are sorry to hear that you encountered such a problem. Regrettably, I was not able to reproduce the issue. 

Would you mind sharing additional information as described below? 

• a full-screen screenshot that demonstrates the issue;
• Did it start happening after updating to 2024.1.2 or earlier?
• Is UE5.3 installed from launcher or built from sources?

Have a nice day!

As far as I remember it just started happening one day. I updated Rider to 2024.1.2 to see if it would go away, but it didn't.

I'm building UE5.3 from source, no changes to the source code.

Hello,

Thank you for the details shared.
I was able to reproduce this by adding PublicDefinitions.Add("__clang_analyzer__=1"); to the Project.Build.cs file.
There are my findings at the moment:

• (__builtin_expect(!bool(false), 0) ? CA_AssumeNoReturn() : (void)0); is an expansion of the CA_ASSUME macro;
• CA_ASSUME is defined as #define CA_ASSUME( Expr )  (__builtin_expect(!bool(Expr), 0) ? CA_AssumeNoReturn() : (void)0) in:
  • Source/Runtime/Core/Public/Clang/ClangPlatformCodeAnalysis.h under condition 
    #if defined( __clang_analyzer__ )
    #define USING_CODE_ANALYSIS 1
#if USING_CODE_ANALYSIS;
  • Source/Runtime/Core/Public/Windows/WindowsPlatformCodeAnalysis.h under condition 
    #else // defined(__clang_analyzer__)
• __builtin_expect is non-standard. It's a GCC extension, so it's not guaranteed to be available on all compilers.
• As I can judge, it is not a part of MSVC;
• Which means:
  • you either have __clang_analyzer__ defined while using MSVC compiler, so that the __builtin_expect is not defined;
  • you use clang to compile UE <WindowsPlatform><Compiler>Clang</Compiler></WindowsPlatform> option in BuildConfiguration.xml.
    However, in with such a setup, I couldn't reproduce the issue.

To move on, I would appreciate it if you could share additional information as described below:

• Your LiMonster.Build.cs file;
• If you ever customized the BuildConfiguration.xml or have per-project BuildConfiguration.xml file (in your project folder) please share its content;
• Is issue reproducible with a newly created project?

Meanwhile, I reported the case I found to our tracker: RSCPP-35769 __builtin_expect is not resolved in checkf() macro. UE5. You might want to have a look at this issue. It might be your case, if you have `__clang_analyzer__` defined. If so, you can disable this flag to workaround the issue.

Have a nice day!