On Wed, Apr 20, 2011 at 10:37:40PM +0100, Dominic Hargreaves wrote:
> On Tue, Apr 27, 2010 at 09:53:47PM +0300, Niko Tyni wrote:
> > This package fails to build on i386 with perl 5.12.0-1 from experimental:
> >
> > t/05.ops.t ........... 1/6 OverflowError in method
> > 'get_devices_with_cap', argument 1 of type 'unsigned int'
> > # Looks like you planned 6 tests but ran 1.
> > # Looks like your test exited with 2 just after 1.
> > t/05.ops.t ........... Dubious, test returned 2 (wstat 512, 0x200)
> > Failed 5/6 subtests
> >
> > This very probably happens because 5.12.0-1 is configured with
> > -Duse64bitint.
Having a quick look at this, I don't think this problem is specific to
libdevice-cdio-perl, I think it may be an issue with SWIG. From the looks of
it, SWIG doesn't handle -Duse64bitint correctly when presented with
integer arguments > 2^31. The value from perl is a 64-bit IV; this confuses
SWIG's argument handling code, which seems to be expecting that
sizeof(perl IV) == sizeof(C int).
Basically, the SWIG wrapper code that errors is:
ecode1 = SWIG_AsVal_unsigned_SS_int SWIG_PERL_CALL_ARGS_2(ST(0), &val1);
if (!SWIG_IsOK(ecode1)) {
SWIG_exception_fail(SWIG_ArgError(ecode1), "in method '"
"get_devices_with_cap" "', argument " "1"" of type '" "unsigned int""'");
}
The test that fails is passing in CDIO_FS_MATCH_ALL, which is 0xfffffff0.
SWIG_AsVal_unsigned_SS_int calls SWIG_AsVal_unsigned_SS_long, which contains
this code:
if (SvUOK(obj)) {
if (val) *val = SvUV(obj);
return SWIG_OK;
} else if (SvIOK(obj)) {
long v = SvIV(obj);
if (v >= 0) {
if (val) *val = v;
return SWIG_OK;
} else {
return SWIG_OverflowError;
}
}
Running this in gdb, I can see that SvUOK returns false (as obj is an IV),
and SvIOK returns true. SvIV correctly returns 0xffffffff0, which is -16
when put into a signed variable. This obviously makes the (v >= 0) test
fail, causing the OverflowError.
Anyway, I'd say this is a SWIG bug and not a bug in libdevice-cdio-perl.
FWIW, I tested it with the version of swig2.0 in unstable and it has the
same problem. Think this upstream SWIG bug is relevant:
http://sourceforge.net/tracker/?func=detail&aid=1481958&group_id=1645&atid=101645
No activity in 4 years though :(
--
Chris Butler <chr...@debian.org>
GnuPG Key ID: 4096R/49E3ACD3
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