[Issue 18367] New: dmd should not segfault on -X with libraries, but no source files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18367

          Issue ID: 18367
           Summary: dmd should not segfault on -X with libraries, but no
                    source files
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

dmd -conf= -X foo.a

segfaults. Okay, it's a bizarre and wrong usage, but it should still print a
proper error message and not SEGFAULT.

PR incoming.

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