Bug 199736 - perl C compiler Can't locate object method "IVX" via package "B::NV"
Summary: perl C compiler Can't locate object method "IVX" via package "B::NV"
Alias: None
Product: Fedora
Classification: Fedora
Component: perl
Version: 5
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Robin Norwood
QA Contact: David Lawrence
Depends On:
TreeView+ depends on / blocked
Reported: 2006-07-21 17:47 UTC by Tim Taiwanese Liim
Modified: 2009-12-03 17:17 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-10-04 19:16:17 UTC
Type: ---

Attachments (Terms of Use)

Description Tim Taiwanese Liim 2006-07-21 17:47:20 UTC
Description of problem:
  When compile perl script into C code, modules complained 
      Can't locate object method "IVX" via package "B::NV"

Version-Release number of selected component (if applicable):
    $ rpm -qf /usr/lib/perl5/5.8.8/i386-linux-thread-multi/B/C.pm

How reproducible:

Steps to Reproduce:
1. create a file tw.pl with this content:
        #!/usr/bin/perl -w
        use strict;
        package mx;
        sub new {}
        #sub x   { my $m = 5.1; }

2. compile with this line
        time perl -MO=C tw.pl > t.c
Actual results:
    Got error msg
        Can't locate object method "IVX" via package "B::NV" at    
            /usr/lib/perl5/5.8.8/i386-linux-thread-multi/B/C.pm line 650.
        CHECK failed--call queue aborted.

Expected results:
    Compiling ok, produce a compilable .c file:

Additional info:

Comment 1 Tim Taiwanese Liim 2006-07-21 17:49:00 UTC
I made a typo on the example; there should be no "#" in front of "sub x".

Comment 2 Tim Taiwanese Liim 2006-07-21 20:40:29 UTC
This is a simpler example to illustrate the same issue.
    $v =  2.35;

Comment 3 Jason Vas Dias 2006-07-22 00:35:54 UTC
Yes, looking at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/B/C.pm, 
B::NV::save appears to be mostly copied from B::IV::save, and on line
650, the $sv->IVX should be a $sv->NVX - with that change, your examples
compile correctly. Indeed, without that change, perlcc doesn't seem to be
able to handle floating point values at all.
You can fix this locally by applying this patch:
--- ./lib/B/C.pm        2006-01-13 09:47:39.000000000 -0500
+++ /usr/lib/perl5/5.8.8/i386-linux-thread-multi/B/C.pm 2006-07-21
20:25:39.000000000 -0400
@@ -650 +650 @@
-    $xpvnvsect->add(sprintf("0, 0, 0, %d, %s", $sv->IVX, $val));
+    $xpvnvsect->add(sprintf("0, 0, 0, %d, %s", $sv->NVX, $val));
or by changing byte 18708 of C.pm from 'I' to 'N'.

That said, as stated in todays perl5-porters mail on this subject:
>    Re: [perl #39903] perl C compiler Can't locate object method "IVX" via
package "B::NV"
>  From: "Joshua ben Jore" <twists@gmail.com>
>    To: perl5-porters@perl.org
>    CC: bugs-bitbucket@netlabs.develooper.com
>  Date: 2006-07-21 17:53
> B::C, B::CC, and perlcc are not being maintained. I can only
> guess as to why you tried to use this. Perhaps to get a single binary,
> perhaps to get faster execution or startup, perhaps to hide your source
> code. The first two goals can be achieved through tools like PAR and pperl.
> Josh

Yes, nothing in perlcc / B::C seems to have been maintained since 1998, so
it is unlikely the above will be the only issue you encounter when trying
to use perlcc for any real app. I suggest you seriously examine why you
need to use these tools; but I'll apply the above patch on the next release.

Comment 4 Robin Norwood 2006-10-01 23:27:34 UTC
assigning to rnorwood@redhat.com

Comment 5 J. Nick Koston 2009-12-01 14:56:42 UTC
This is slated to be resolved in a newer version:


Comment 6 Tim Taiwanese Liim 2009-12-03 17:17:20 UTC
Thanks for update!

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