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[perl #75466] [PATCH] glob is inconsistent about <> overloading

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From:
Father Chrysostomos
Date:
May 31, 2010 04:56
Subject:
[perl #75466] [PATCH] glob is inconsistent about <> overloading
Message ID:
rt-3.6.HEAD-4976-1275255435-1259.75466-75-0@perl.org
# New Ticket Created by  Father Chrysostomos 
# Please include the string:  [perl #75466]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=75466 >


 From overload’s docs:

      o    Iteration

               "<>"

           If not overloaded, the argument will be converted to a  
filehandle
           or glob (which may require a stringification).  The same
           overloading happens both for the read-filehandle syntax "< 
$var>"
           and globbing syntax "<${var}>".

It hasn’t happened with globbing syntax since File::Glob was  
introduced with 5.6. Actually, it does happen in miniperl and when  
perl is otherwise compiled with PERL_EXTERNAL_GLOB (how do you do  
that, BTW?). It can also be triggered in 5.6 with BEGIN { ++$INC{"File/ 
Glob.pm"} }. The latter crashes as of 5.8, but a patch I’ve just  
submitted (75464) fixes that.

Also, external glob does not respect <> overloading if the overloaded  
object is returned by a tied scalar.

So, the docs are wrong most of the time. In a few corner cases they  
are right.

I propose that we fix the docs and eliminate this exceptional case,  
making pp_glob (aka external glob) act the same way as File::Glob.

The attached patch (if there is one) should do just this.


Use of uninitialized value $category in concatenation (.) or string  
at /usr/local/bin/perlbug5.13.1 line 645.
Use of uninitialized value $severity in concatenation (.) or string  
at /usr/local/bin/perlbug5.13.1 line 645.
---
Flags:
     category=core
     severity=low
---
Site configuration information for perl 5.13.1:

Configured by sprout at Thu May 20 09:22:52 PDT 2010.

Summary of my perl5 (revision 5 version 13 subversion 1 patch  
v5.13.1-4-ge77da3b) configuration:
   Snapshot of: 1404b48744cfa915e3f54775feb4e9b6c10f3b91
   Platform:
     osname=darwin, osvers=10.0.0, archname=darwin-thread-multi-2level
     uname='darwin pint.local 10.0.0 darwin kernel version 10.0.0: fri  
jul 31 22:47:34 pdt 2009; root:xnu-1456.1.25~1release_i386 i386 '
     config_args='-de -Dusedevel -Duseithreads -A define:d_setregid -A  
define:d_setreuid -A define:d_setrgid -A define:d_setruid'
     hint=recommended, useposix=true, d_sigaction=define
     useithreads=define, usemultiplicity=define
     useperlio=define, d_sfio=undef, uselargefiles=define,  
usesocks=undef
     use64bitint=undef, use64bitall=undef, uselongdouble=undef
     usemymalloc=n, bincompat5005=undef
   Compiler:
     cc='cc', ccflags ='-fno-common -DPERL_DARWIN -no-cpp-precomp -fno- 
strict-aliasing -pipe -fstack-protector -I/usr/local/include',
     optimize='-O3',
     cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp- 
precomp -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/ 
include'
     ccversion='', gccversion='4.2.1 (Apple Inc. build 5646)',  
gccosandvers=''
     intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
     d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
     ivtype='long', ivsize=4, nvtype='double', nvsize=8,  
Off_t='off_t', lseeksize=8
     alignbytes=8, prototype=define
   Linker and Libraries:
     ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack- 
protector -L/usr/local/lib'
     libpth=/usr/local/lib /usr/lib
     libs=-ldbm -ldl -lm -lutil -lc
     perllibs=-ldl -lm -lutil -lc
     libc=/usr/lib/libc.dylib, so=dylib, useshrplib=false,  
libperl=libperl.a
     gnulibc_version=''
   Dynamic Linking:
     dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
     cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/ 
usr/local/lib -fstack-protector'

Locally applied patches:


---
@INC for perl 5.13.1:
     /usr/local/lib/perl5/site_perl/5.13.1/darwin-thread-multi-2level
     /usr/local/lib/perl5/site_perl/5.13.1
     /usr/local/lib/perl5/5.13.1/darwin-thread-multi-2level
     /usr/local/lib/perl5/5.13.1
     /usr/local/lib/perl5/site_perl
     .

---
Environment for perl 5.13.1:
     DYLD_LIBRARY_PATH (unset)
     HOME=/Users/sprout
     LANG=en_US.UTF-8
     LANGUAGE (unset)
     LD_LIBRARY_PATH (unset)
     LOGDIR (unset)
     PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/ 
usr/local/bin
     PERL_BADLANG (unset)
     SHELL=/bin/bash

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