https://issues.dlang.org/show_bug.cgi?id=19660

          Issue ID: 19660
           Summary: 'export' keyword on OSX dynlib globals causing
                    segfaults
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: redapple82570@gmail.com

Created attachment 1732
  --> https://issues.dlang.org/attachment.cgi?id=1732&action=edit
minimal example (Mac/Windows)

[DMD 2.084.0 on macOS 10.12]

The presence of 'export' on a global dynlib/DLL variable:

eg. "extern (C) export extern __gshared int someValue;"

... is causing inconsistent behavior between Mac/PC: keyword is required for linking against DLL on Windows, but causes runtime segfaults* on Mac. Removing 'export' solves Mac crashes but then Windows linking fails.

* initially this issue was discovered due to the globals having incorrect values. But the attached example is segfaulting.

LDC2 (1.14.0-beta1) does NOT exhibit the same issue.

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