Special behaviour for _Dmodule_ref and _d_run_main?

[Denis Feklushkin]

On Monday, 11 May 2020 at 12:48:20 UTC, David Nadlinger wrote:

> How are you currently invoking the linker, especially regarding 
> ordering of libraries/object files on the command line?

I run lld from clang by Meson. But I don’t think that this should 
influence anything: all discussed symbols are external in C 
format:

sections_ldc.d:
extern (C) __gshared ModuleReference* _Dmodule_ref;   // start of 
linked list

dmain2.d:
extern (C) int _d_run_main(int argc, char** argv, MainFunc 
mainFunc)

And also all works ok if "-flto" isn't used.

If I start linking by ldc2 it throws error at first passed object 
file:

firmware.elf at exe/meson-generated_gpio.d.o: file not recognized: 
file format not recognized

llvm-nm-9 confirms that this is object file.

This issues occurs only if -flto= enabled.

> LDC doesn't have any special handling for druntime (beyond the 
> defaultlib selection logic).

It's good. I tried define some external(C) symbol near of 
_Dmodule_ref and then use it from main() - linking with this 
symbol works ok. So, this problem only with "hidden"  calls 
invoked by compiler.