How make shared struct using #pragma DATA_SECTION

I'm not sure what you mean by a shared struct.  Do you mean you need multiple source files to know the members in a "struct stack"?  You do that by putting the definition of "struct stack" in a header file, then including that header file in C source files with the preprocessor directive #include.  The DATA_SECTION pragma has no role in any of that.  The DATA_SECTION pragma is not applied to the type struct stack, but to variables of that type.  Suppose struct strack is defined in a header file named struct_defs.h.  Then a C source file could have lines like this ...

#include "struct_defs.h"
#pragma DATA_SECTION(global_stack, "section_name_here");
struct stack global_stack;

Thanks and regards,

-George