On Mon, Sep 20, 2021 at 7:37 AM John Emmas via cfe-users
<cfe-users@lists.llvm.org> wrote:
>
> Hi there - I'm building quite a complex Windows program here using
> VS2019. Obviously there's an EXE and there's maybe 30 or so DLLs. Some
> DLL's might have code which looks like this in a header file:-
>
> class whatever {
> static int revision_num;
> };
>
> or if there's no class involved it'd maybe look like this:-
>
> extern int revision_num;
>
> ...
> But if I switch VS2019 to use Clang (when building the EXE) Clang's
> linker will complain that it can't find the variable 'revision_num'.
> But of course, 'revision_num' is an internal variable that's private to
> the DLL - so the EXE should never need to know about it...
'revision_num' is declared static. Try 'extern static int revision_num'.
Getting this sort of thing to compile under different compilers can be
tricky. Especially when exporting templates.
Jeff
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