Can I create static c callable library?

[Jonathan M Davis]

On Thursday, September 27, 2018 6:16:13 AM MDT Atila Neves via Digitalmars-
d-learn wrote:
> On Tuesday, 25 September 2018 at 14:13:50 UTC, Jacob Carlborg
>
> wrote:
> > On Tuesday, 25 September 2018 at 12:05:21 UTC, Jonathan M Davis
> >
> > wrote:
> >> If you use -betterC, then it's trivial, because your D program
> >> is restricted to extern(C) functions and features which don't
> >> require druntime. It can also be done without -betterC (and
> >> thus with druntime), but it gets to be _way_ more of a pain,
> >> because it requires that you manually initialize druntime -
> >> either by forcing whatever is using your "C" library to call a
> >> specific function to initialize druntime before using any of
> >> its normal functions or by having every function in the
> >> library check whether druntime has been initialized yet and
> >> initialize it if it hasn't been before it does whatever it's
> >> supposed to do.
> >
> > Shouldn't it be possible to use a C initialization function,
> > i.e. pragma(crt_constructor) to initialize druntime? Then it
> > only needs to be initialized once and it's not required to
> > check if it's initialized all the time.
> >
> > --
> > /Jacob Carlborg
>
> Even easier, compile this C file and add the resulting object
> file to your (now mostly) D static library:
>
> -----------------------
> extern int rt_init(void);
> extern int rt_term(void);
>
> __attribute__((__constructor__)) void dinit(void) {
>      rt_init();
> }
> __attribute__((__destructor__)) void dterm(void) {
>      rt_term();
> }
> -----------------------
>
> The C runtime will initialise the D runtime for you.

That's a neat trick.

- Jonathan M Davis