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Another option to consider, perhaps more "C++ish", would be a variation on the singleton pattern:

Some h file


struct Globals
{
static int& getMyIntGlobal()
{
static int...

Make sure any declaration of the variable in a header file uses the extern keyword, and that only one source file contains the actual definition.

If the variables aren't even declared anywhere, then any attempts to use them should result in a compile error before you even get to the linker.

I suspect what you may be facing is a modification...