Is this a bug?

[H. S. Teoh]

On Wed, Nov 27, 2013 at 02:06:33AM -0500, Jerry wrote:
> Jerry <jlquinn at optonline.net> writes:
> 
> > "H. S. Teoh" <hsteoh at quickfur.ath.cx> writes:
> >
> >> On Tue, Nov 26, 2013 at 06:33:28PM -0500, Jerry wrote:
> >>> If I read correctly, the following is legal code.  If you comment out
> >>> one of the case statements, it does the expected thing.  With 4 or more,
> >>> it crashes.  This is with dmd 2.064.2 on Debian.
> >>> 
> >>> If it's a bug, I'll file a report.  Thanks!
> >>> 
> >>> class BB {}
> >>> class DD : CC {}
> >>> class CC : BB {
> >>>   static CC create(string s) {
> >>>     // Succeeds with 3 cases, fails with 4
> >>>     switch (s) {
> >>>     case "en":
> >>>     case "it":
> >>>     case "ru":
> >>>     case "ko": return new DD;
> >>>     default: throw new Exception("blech");
> >>>     }
> >>>   }
> >>> }
> >>> 
> >>> void main() {
> >>>     CC.create("en");
> >>> }
> >>> 
> >>> jlquinn at wyvern:~/d$ ~/dmd2/linux/bin64/dmd switchbug.d -g
> >>> jlquinn at wyvern:~/d$ ./switchbug 
> >>> Segmentation fault (core dumped)
> >> [...]
> >>
> >> No crash on dmd git HEAD, Debian/unstable (x86_64).
> >>
> >
> > If I build dmd from the sources, the program works.  It's only the
> > precompiled dmd executable that generates a broken binary.
> 
> Sorry, not true.  I had the extra case commented out.  Uncommenting it
> still gives me a crashing program.

Strange. I tested again on both git HEAD and 2.064.2, and I still don't
get any crashes. This is on Debian/unstable (x86_64). I added a few more
calls to CC.create, just to make sure the switch branches all work as
expected; here is my test code:

------
class BB {}
class DD : CC {}
class CC : BB {
  static CC create(string s) {
    // Succeeds with 3 cases, fails with 4
    switch (s) {
    case "en":
    case "it":
    case "ru":
    case "ko": return new DD;
    default: throw new Exception("blech");
    }
  }
}

void main() {
    CC.create("en");
    CC.create("it");
    CC.create("ru");
    CC.create("ko");
}
------

Are you sure your copy of dmd isn't picking up the wrong version(s) of
the runtime libraries? Maybe try compiling with dmd -v to see if the
include paths and library paths are what you expect?


T

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