When building anything that includes NsMath/Vector.h with clang version at least 10, and -Wignored-qualifiers enabled, the warning is triggered in several places:

Include/NsMath/Vector.h:36:5: error: 'const' type qualifier on return type has no effect [-Werror,-Wignored-qualifiers]
const float operator[](uint32_t i) const;
^~
Include/NsMath/Vector.h:106:5: error: 'const' type qualifier on return type has no effect [-Werror,-Wignored-qualifiers]
const float operator[](uint32_t i) const;
^~
Include/NsMath/Vector.h:176:5: error: 'const' type qualifier on return type has no effect [-Werror,-Wignored-qualifiers]
const float operator[](uint32_t i) const;
^~

Similar in NsMath/Vector.inl:

Include/NsMath/Vector.inl:33:8: error: 'const' type qualifier on return type has no effect [-Werror,-Wignored-qualifiers]
inline const float Vector2::operator[](uint32_t i) const
^~
Include/NsMath/Vector.inl:238:8: error: 'const' type qualifier on return type has no effect [-Werror,-Wignored-qualifiers]
inline const float Vector3::operator[](uint32_t i) const
^~
Include/NsMath/Vector.inl:452:8: error: 'const' type qualifier on return type has no effect [-Werror,-Wignored-qualifiers]
inline const float Vector4::operator[](uint32_t i) const
^~

The above output is when building with version 3.0, but I did a quick check and looks like 3.1 headers still look the same, so I am setting the version to 3.1.

This issue is espacially annoying when building with -Werror.
Of course, we can work around it by disabling the warning before including these, but this requires also disabling it anywhere where the files are included indirectly via other noesis SDK headers.