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       Storage-class_Qualifiers - The typedef, extern and static storage-class specifiers.


       The typedef, extern, and static storage-class specifiers are supported. The auto and
       register storage-class specifiers are not supported..

       The extern storage-class specifier can only be used for functions (kernel and non-kernel
       functions) and global variables declared in program scope. The static storage-class
       specifier can only be used for non-kernel functions and global variables declared in
       program scope.

       extern constant float4 noise_table[256]; static
       constant float4 color_table[256];

       extern kernel void my_foo(image2d_t img); extern
       void my_bar(global float *a);

       kernel void my_func(image2d_t img, global float
       *a) { extern constant float4 a;      // error.
       static constant float4 b;      // error.  static
       float c;                // error.

       ...  my_foo(img); ...  my_bar(a); ...  }


       OpenCL Specification[1]


       The Khronos Group


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        1. OpenCL Specification
           page 230, section 6.8 - Storage-class Qualifiers