Fix cudaErrorDuplicateVariableName: Duplicate Device Variable

Overview

cudaErrorDuplicateVariableName occurs when multiple device variables share same name.

Error Messages

CUDA error: duplicate variable name
cudaErrorDuplicateVariableName

Common Causes

• •Same __device__ var in multiple files
• •Header included twice
• •Linking conflict

Solutions

namespace MyModule { __device__ int myVar; }

Prevention Tips

• ✓Use namespaces
• ✓Avoid device vars in headers
• ✓Use static

Code Examples

Before (Problematic)

Same name.

// file1.cu
__device__ int counter;
// file2.cu
__device__ int counter;  // Duplicate!

After (Fixed)

Namespaced.

namespace File1 { __device__ int counter; }

Frequently Asked Questions

Related Errors

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