www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - [Issue 13666] New: Undefined Symbols for __gshared data symbols in


          Issue ID: 13666
           Summary: Undefined Symbols for __gshared data symbols in
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: r.sagitario gmx.de

Compile this module to a library:

module test;

template drt_envvars_enabled()
    extern(C) __gshared bool drt_envvars_enabled = false;

bool foo()
    return drt_envvars_enabled!();

 dmd -lib test.d
Then link it with main.d: import test; int main() { return foo(); } //////////////
 dmd main.d test.lib
OPTLINK (R) for Win32 Release 8.00.15 Copyright (C) Digital Mars 1989-2013 All rights reserved. http://www.digitalmars.com/ctg/optlink.html test.lib(test) Error 42: Symbol Undefined __D4test25__T19drt_envvars_enabledZ19drt_envvars_enabledb --- errorlevel 1 According to https://github.com/D-Programming-Language/druntime/pull/986, this fails for Win32 and OS/X, but works for other platform. It also works if the variable is not "__gshared" or it is initialized to a non-zero value. It is probably caused by some bad BSS optimization. --
Oct 30 2014