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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug d/99914] New: d: Template symbols not overridable by normal
 symbols
Date: Mon, 05 Apr 2021 11:07:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99914

            Bug ID: 99914
           Summary: d: Template symbols not overridable by normal symbols
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

Currently, the following does not link:

 extern(C) __gshared bool rt_cmdline_enabled =3D false;

Because the symbol conflicts with a template symbol of the same name in the=
 D
runtime library.

 template rt_cmdline_enabled()
 {
     pragma(mangle, "rt_cmdline_enabled")
     __gshared bool rt_cmdline_enabled =3D true;
 }

Template symbols are made DECL_ONE_ONLY, which ends up in the gnu.linkonce
section as a unique global symbol.  However, the linker only considers other
symbols in gnu.linkonce as being candidates for discarding duplicates.

The expected and correct behaviour is for all instantiations to be declared
weak.=