What does 'inline' mean?

[Manu]

On Sat, Jun 13, 2020 at 1:30 PM Andrei Alexandrescu via Digitalmars-d <
digitalmars-d at puremagic.com> wrote:

> On 6/12/20 8:54 PM, Walter Bright wrote:
> > On 6/12/2020 5:17 PM, Andrei Alexandrescu wrote:
> >> Not sure about that part - if linkage was static by means of using the
> >> "static" keyword, multiple definitions may not be merged. (I may be
> >> wrong, please correct me.) Consider:
> >>
> >> static inline int fun() {
> >>      static int x;
> >>      return ++x;
> >> }
> >>
> >> In C++, each translation unit containing a definition of fun() will
> >> have a distinct address for x. I don't see how the bodies of those
> >> functions can be merged.
> >
> > They are not merged in D, for the simple reason that ModuleA.fun() and
> > ModuleB.fun() will have different (mangled) names presented to the
> linker.
>
> For D the question is if they are merged if the function is defined in a
> .di file and imported in two other modules.
>

They are not 'merged', they just don't exist.
The problem I've repeated many times for D is that it doesn't emit the
function ANYWHERE, and as such, you get a "undefined symbol" error. This is
different than C++ where you would have gotten a "multiply defined symbol"
error, but it's exactly the same problem for the exact same reason. It just
manifests differently because C++ has .h files which naturally duplicates
the code into each CU and D doesn't.
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