0005132: [Unreal] Noesis Math.h global E constant collides with Unreal static Method in ShaderPermutation.h using Unity build

ID	Project	Category	View Status	Date Submitted	Last Update

0005132	NoesisGUI	Unreal	public	2026-07-16 13:43	2026-07-16 16:43

Reporter	JinFox	Assigned To
Priority	normal	Severity	major
Status	new	Resolution	open
Product Version	Studio_Beta

Summary	0005132: [Unreal] Noesis Math.h global E constant collides with Unreal static Method in ShaderPermutation.h using Unity build
Description	Hello, Our project compiles with the C4459-as-error flag which prevents global scope symbols to be hidden. It seems that there is a conflict due to the E constant declared in Math.h. constexpr float E = 2.71828182845904523536028747135266249775724709369996f; This is triggering an error with Unreal file ShaderPermutation.h as several static method are using E as parameter name in this file (such as static int32 ToDefineValue(Type E)). A simple solution that I have implemented locally is to rename that constant to something more specific to prevent the conflict from happening by changing it by this line : constexpr float EulerE = 2.71828182845904523536028747135266249775724709369996f; Would that be something you would be willing to change in your source or should I keep my source change? Thank you

Platform	Any

Date Modified	Username	Field	Change
2026-07-16 13:43	JinFox	New Issue
2026-07-16 14:57	JinFox	Note Added: 0012420
2026-07-16 16:43	JinFox	Summary	Noesis Math.h global E constant collides with Unreal static Method in ShaderPermutation.h => [Unreal] Noesis Math.h global E constant collides with Unreal static Method in ShaderPermutation.h using Unity build

JinFox 2026-07-16 14:57 reporter ~0012420	As a note, it seems to be a convergence of issue of using unreal's Unity builds and this flag of warning as error. it's not just the E symbol causing the issue by itself