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Compiler Error C3055

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'symbol' : symbol cannot be referenced before it is used in 'threadprivate' directive

A symbol was referenced and then used in a threadprivate clause, which is not allowed.

The following sample generates C3055:

// C3055.cpp
// compile with: /openmp
int x, y;
int z = x;
#pragma omp threadprivate(x, y)   // C3055

void test() {
   #pragma omp parallel copyin(x, y)
   {
      x = y;
   }
}

Possible resolution:

// C3055b.cpp
// compile with: /openmp /LD
int x, y, z;
#pragma omp threadprivate(x, y)

void test() {
   #pragma omp parallel copyin(x, y)
   {
      x = y;
   }
}