[Bug d/92216] New: GDC generate duplicate symbols when mixins and interfaces are used to gather

[kozzi11 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92216

            Bug ID: 92216
           Summary: GDC generate duplicate symbols when mixins and
                    interfaces are used to gather
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: kozzi11 at gmail dot com
  Target Milestone: ---

Created attachment 47109
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47109&action=edit
Zip archive with b.d and c.d files

There seems to be an issue with generating object symbols for mixins. In some
cases gdc generate same symbols (not weak) in object files so there is a
collision when linking.

Trying to build gtkd package is one of examples. I have write small example to
mitigate this issue. It is add as an attachment.

$ gdc -c -o b.o b.d
$ gdc -c -o c.o c.d
$ gdc -o test.o b.o c.o

ld: c.o: in function `_DT16_D1b1B8__mixin24getSMFZPv':
c.d:(.text+0x27): multiple definition of `_DT16_D1b1B8__mixin24getSMFZPv';
b.o:b.d:(.text+0x38): first defined here

I have try this with gcc 9.2 (gdc (GCC) 9.2.0)

And with git gcc(gdc) 10 (from august)

same issue for both versions