Unsupported architecture - Shared Enum between Metal and Swift

Question

I try to share an Enum that I defined in an Header File between metal and my swift project:

#ifndef SharedIndizes_h
#define SharedIndizes_h
#import <Foundation/Foundation.h>

#endif /* SharedIndizes_h */

typedef NS_ENUM(NSInteger, VertexAttribute)
{
    VertexAttributePosition = 0,
    VertexAttributeNormal  = 1,
};

#include <metal_stdlib>
#import "ExchangeTypes/SharedIndizes.h"
using namespace metal;

struct VertexIn {
    float3 position [[ attribute(VertexAttributePosition) ]];
    float3 normal [[ attribute(VertexAttributeNormal) ]];
};

vertexDescriptor.attributes[VertexAttribute.position.rawValue]
vertexDescriptor.attributes[VertexAttribute.normal.rawValue]

But all I get is some unexpected Errors:

• Unsupported architecture

• unknown type name '_int64_t'

• unknown type name '_int32_t'

• ...

Removing #import "ExchangeTypes/SharedIndizes.h" from my metal File also removes the errors.

Answer 1

Replace this:

#ifndef SharedIndizes_h
#define SharedIndizes_h
#import <Foundation/Foundation.h>

#endif /* SharedIndizes_h */

typedef NS_ENUM(NSInteger, VertexAttribute)
{
    VertexAttributePosition = 0,
    VertexAttributeNormal  = 1,
};

with this:

#ifndef SharedIndizes_h
#define SharedIndizes_h

#ifdef __METAL_VERSION__
#define NS_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
#define NSInteger metal::int32_t
#else

#import <Foundation/Foundation.h>

#endif /* __METAL_VERSION__ */
#endif /* SharedIndizes_h */

typedef NS_ENUM(NSInteger, VertexAttribute)
{
    VertexAttributePosition = 0,
    VertexAttributeNormal  = 1,
};