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extrange behaviour building from vs and compiling from editor (almost same code)

For version A:

  • if I hit F7 inside inside vs 2015 community, it fails linking

Development\UE4Editor-BatteryCollector-4265.lib and object Z:	yoc\Unreal Projects\BatteryCollector\Intermediate/Build/Win64\UE4Editor\Development\UE4Editor-BatteryCollector-4265.exp
2>BatteryCollector.generated.cpp.obj : error LNK2001: unresolved external symbol "class FName BATTERYCOLLECTOR_Prox" (?BATTERYCOLLECTOR_Prox@@3VFName@@A)
2>Z:	yoc\Unreal Projects\BatteryCollector\Binaries\Win64\UE4Editor-BatteryCollector-4265.dll : fatal error LNK1120: 1 unresolved externals

  • from the editor it compiles with the compile button

For version B:

  • if I hit F7 inside inside vs 2015 community, it compiles OK
  • from the editor it compiles with the compile button

The only difference with A is if I choose to name Prox instead of version B prox (with lower case)

Here the versions:

Bullet.h - Version A


    UFUNCTION(BlueprintNativeEvent, Category = "Collision")
        void Prox(AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult);

    void Prox_Implementation(AActor * OtherActor, UPrimitiveComponent * OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult);


Bullet.cpp - Version A



    ProxSphere->OnComponentBeginOverlap.AddDynamic(this, &ABullet::Prox);

void ABullet::Prox_Implementation(AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult)



Bullet.h - version B


    UFUNCTION(BlueprintNativeEvent, Category = "Collision")
        void prox(AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult);

    void prox_Implementation(AActor * OtherActor, UPrimitiveComponent * OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult);


Bullet.cpp - Version B



    ProxSphere->OnComponentBeginOverlap.AddDynamic(this, &ABullet::prox);

void ABullet::prox_Implementation(AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult)