[Issue 12696] New: GIT HEAD : undefined symbols when -O specified

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12696

          Issue ID: 12696
           Summary: GIT HEAD : undefined symbols when -O specified
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: temtaime at gmail.com

Created attachment 1350
  --> https://issues.dlang.org/attachment.cgi?id=1350&action=edit
test case

Compiling test case with -O gives

 Error 42: Symbol Undefined
_D10perfontain6matrix21__T6MЂ…ЊTfVki4Ъ1ZЂ‡’8__xopCmpFKxSЂ±ѕЂґґZi

 Error 42: Symbol Undefined
_D10perfontain6matrix21__T6MЂ…ЊTfVki4Ъ1ZЂ‡’1ЂѓћxopEqualsFKxSЂ±ВЂґґZb

 Error 42: Symbol Undefined
_D10perfontain6matrix21__T6MatrixTfVki4Vki1Z6Matrix8toStringMxFNaNbNiNfZAya

It's dustmited from project of 14k lines.
If anyone know how to reduce it more bienvenue.

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