Linux shared library loading/linking from C does not invoke (shared) static this

[ichneumwn]

On Tuesday, 12 January 2021 at 09:49:46 UTC, Mike Parker wrote:
> On Tuesday, 12 January 2021 at 09:31:08 UTC, ichneumwn wrote:
>
>>
>> Follow on to my own question: on Linux, with gcc, I have 
>> created the following file "starter.c" that I inject into my D 
>> shared library:
>>
>>   int rt_init(void);
>>   int rt_term(void);
>>
>>   // should really check for errors!
>>   static void __attribute__((constructor)) Dstarter(void) {
>>     rt_init();
>>   }
>>
>>   static void __attribute__((destructor)) Dterminator(void) {
>>     rt_term();
>>   }
>>
>> That seems to do the trick. Not sure how clean this is?
>
> You should be able to do the same in D with 
> `pragma(crt_constructor)` and `pragma(crt_destructor)`:
>
> https://dlang.org/spec/pragma.html#crtctor
> https://dlang.org/spec/pragma.html#crtdtor
> https://dlang.org/changelog/2.078.0.html#crt-constructor

Perfect, thanks! Interestingly, as I removed the C stub and tried 
the D route, I noticed that just calling rt_init() is enough to 
also get static ~this() to run on exit. In fact then adding 
writeln in a pragma(crt_destructor) function shows that it gets 
called after static ~this().

For anyone stumbling across this thread and looking for the 
import for rt_init/term:

import core.runtime : rt_init, rt_term;