🚀 go-pugleaf

I've tried this out on Sparc SunOS 4.1.1 and DG-Aviion-dgux5.4.1.

The attached file foo.cc gets an error "uninitialized constant xxxxx"
when compiled with gcc -g.  None of the other extern "C" lines give
an error.

According to the ARM, p. 118, first annotation, 
extern "C" int a2;
is supposed to be a declaration, not a definition, while
extern "C" { int a1; } 
is a definition, and can only be made a declaration using
extern "C" {extern int a1;}

G++ seems to be confused about this distinction when an aggregate
is involved.  

The actual case that caused the original problem was in dgux5.4.1,
/usr/include/limits.h, which includes various stuff boiling down to
#if defined(__cplusplus)
#define _EXTERN extern "C"
#else
#define _EXTERN extern
#endif
typedef union { unsigned long i[2]; double d; } h_val;
_EXTERN const h_val xxxxx;


---------------------------------------------------------------------
/* Begin foo.cc */

#include <stdio.h>
typedef union { unsigned long i[2]; double d; } zork;
extern "C" const zork xxxxx;
extern "C" const int aaaaa;
extern "C" int bbbbb;
extern const zork yyyyy;


main()
{
    printf("Hello world.\n");
    exit(0);
}