Question

If the syntax of extern is

extern <type> <name>;

how do I extern if I have an unnamed, single use struct:

struct {
    char **plymouthThemes;
    char *plymouthTheme;
} global;

I’ve tried

extern global;

without any type, and it doesn’t work.

Or, do I have to name the struct?

Answer 1

You need to name your struct and put it in a .h file or included the definition by hand in every source file that uses global. Like this

///glob.h
    struct GlobalStruct
    {
       ///char** ...
       ///
    };

///glob.cpp
   #include "glob.h"
   struct GlobalStruct global; 

///someOtherFile.cpp
#include "glob.h"

extern struct GlobalStruct global;