Strange Multiple Definition Error using makefile

[Iain Buclaw]

On Wed, 26 Dec 2018 at 22:25, LeqxLeqx via D.gnu <d.gnu at puremagic.com> wrote:
>
> ===== and my simple makefile ======
>
>      O_FILES=myinterface.o myabstractclass.o myclass.o main.o
>      CC=gdc
>

Ahem, CC means "C Compiler", you should be using another variable name here. ;-)

>
> I'm using GDC version: `gdc (Ubuntu 8.2.0-1ubuntu2~18.04) 8.2.0'
>
> So ultimately, my question is: What am i doing wrong here?
> Any and all help is appreciated.

Two object files are claiming to have the one true copy of the thunk
to firstMethod.

Switching from separate compilation to compiling all sources in one
compilation command will sort that out.

---
D_FILES=myinterface.d myabstractclass.d myclass.d myderived.d main.d
CC=gdc

.PHONY : all
all : test.bin

test.bin: $(D_FILES)
        $(CC) -o $@ $^
---

There should be better spec over how thunks (particularly to methods
outside the compilation unit) are handled.  Maybe this can be
addressed before version 9 release.

-- 
Iain