C++ Compile log

Development Programming & Scripting
1

When ever I use the C++ compiler in UE4 I get a “Compile Failed”. This shows up in the log.

Using 'git status' to determine working set for adaptive non-unity build (C:\Users\CMeye\Documents\puzzlegame).
Creating makefile for PuzzleGameEditor (ini files are newer than makefile)
Parsing headers for PuzzleGameEditor
  Running UnrealHeaderTool "C:\Users\CMeye\Documents\puzzlegame\PuzzleGame\PuzzleGame.uproject" "C:\Users\CMeye\Documents\puzzlegame\PuzzleGame\Intermediate\Build\Win64\PuzzleGameEditor\Development\PuzzleGameEditor.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -installed
Reflection code generated for PuzzleGameEditor in 9.1834073 seconds
Using Visual Studio 2017 14.16.27023 toolchain (C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Tools\MSVC\14.16.27023) and Windows 10.0.17763.0 SDK (C:\Program Files (x86)\Windows Kits\10).
Building 4 actions with 8 processes...
  [1/4] PosistionReport.cpp
   d:\epic\ue_4.22\engine\source\runtime\core\public\Logging/LogMacros.h(58) : error C2338: Invalid argument(s) passed to FMsg::Logf_Internal
  C:\Users\CMeye\Documents\puzzlegame\PuzzleGame\Source\PuzzleGame\PosistionReport.cpp(26): note: see reference to function template instantiation 'void FMsg::Logf_Internal(const ANSICHAR *,int32,const FName &,ELogVerbosity::Type,const FmtType (&),const TCHAR *,FString)' being compiled
          with
          [
              FmtType=wchar_t [12]
          ]
   d:\epic\ue_4.22\engine\source\runtime\core\public\Logging/LogMacros.h(60) : error C4840: non-portable use of class 'FString' as an argument to a variadic function
  d:\epic\ue_4.22\engine\source\runtime\core\public\Logging/LogMacros.h(60): note: 'FString::FString' is non-trivial
  d:\epic\ue_4.22\engine\source\runtime\core\public\Containers/UnrealString.h(73): note: see declaration of 'FString::FString'
  d:\epic\ue_4.22\engine\source\runtime\core\public\Logging/LogMacros.h(60): note: the constructor and destructor will not be called; a bitwise copy of the class will be passed as the argument
  d:\epic\ue_4.22\engine\source\runtime\core\public\Windows/WindowsCriticalSection.h(9): note: see declaration of 'FString'

This is my code:

#include "PosistionReport.h"
#include "Runtime/Core/Public/Math/TransformNonVectorized.h"
#include "Runtime/Core/Public/Math/Vector.h"
#include "Runtime/Engine/Classes/GameFramework/Actor.h" 


UPosistionReport::UPosistionReport()
{
	// Set this component to be initialized when the game starts, and to be ticked every frame.  You can turn these features
	// off to improve performance if you don't need them.
	PrimaryComponentTick.bCanEverTick = true;

	// ...
}


// Called when the game starts
void UPosistionReport::BeginPlay()
{
	Super::BeginPlay();

	FString ObjectName = GetOwner()->GetName();
	FString ObjectPos = GetOwner()->GetTransform().GetLocation().ToString(); 

	UE_LOG(LogTemp, Warning, TEXT("%s is at %s"), *ObjectName, ObjectPos);
	
}


// Called every frame
void UPosistionReport::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	// ...
}
2

You can not use direct FString to UE_LOG formatting, you need to pass it as TCHAR, which you already doing with first FString argument

UE_LOG(LogTemp, Warning, TEXT("%s is at %s"), *ObjectName, *ObjectPos);
2 Likes