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[perl #102464] is warning valid?

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From:
Linda Walsh
Date:
October 29, 2011 04:59
Subject:
[perl #102464] is warning valid?
Message ID:
rt-3.6.HEAD-31297-1319889548-1328.102464-75-0@perl.org
# New Ticket Created by  Linda Walsh 
# Please include the string:  [perl #102464]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=102464 >



This is a bug report for perl from perl-diddler@tlinx.org,
generated with the help of perlbug 1.39 running under perl 5.12.3.


-----------------------------------------------------------------
[Please describe your issue here]

To be honest, I'm not even sure this is a real bug, or is be
design, but it seems counterintuive.

if I test a variable for being 'defined' :

	if (defined($foo)) {
		print "foo=$foo\n";
	}


	Should I, even under strict (which is the case), get:

Global symbol "$foo" requires explicit package name at -e line 3.
Execution of -e aborted due to compilation errors.


I can understand *why* it happens, but *should* it happen? 
I.e. in the above example, that "$foo" isn't defined is not a
'design error' and it not being defined is checked for, preventing
it's use.  So should it cause a "parse-time" error?

Not a common case or that important, but it just seemed 'off'...


But it also might be the case that's more work than it is
worth to correct it...?

C'est la vie!... ;-)


an error
and is checked for"$foo" has no need to be defined -- 

Should it be an error if the variable is I mean should I get the error if it is in 


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
This perlbug was built using Perl 5.12.3 - Fri May  6 13:31:41 UTC 2011
It is being executed now by  Perl 5.12.3 - Fri May  6 13:26:30 UTC 2011.

Site configuration information for perl 5.12.3:

Configured by abuild at Fri May  6 13:26:30 UTC 2011.

Summary of my perl5 (revision 5 version 12 subversion 3) configuration:
   
  Platform:
    osname=linux, osvers=2.6.36, archname=x86_64-linux-thread-multi
    uname='linux build33 2.6.36 #1 smp 2011-02-21 10:34:10 +0100 x86_64 x86_64 x86_64 gnulinux '
    config_args='-ds -e -Dprefix=/usr -Dvendorprefix=/usr -Dinstallusrbinperl -Dusethreads -Di_db -Di_dbm -Di_ndbm -Di_gdbm -Duseshrplib=true -Doptimize=-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -pipe -Accflags=-DPERL_USE_SAFE_PUTENV'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -pipe',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector'
    ccversion='', gccversion='4.5.1 20101208 [gcc-4_5-branch revision 167585]', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib64 -fstack-protector'
    libpth=/lib64 /usr/lib64 /usr/local/lib64
    libs=-lm -ldl -lcrypt -lpthread
    perllibs=-lm -ldl -lcrypt -lpthread
    libc=/lib64/libc-2.11.3.so, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.11.3'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.12.3/x86_64-linux-thread-multi/CORE'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib64 -fstack-protector'

Locally applied patches:
    

---
@INC for perl 5.12.3:
    /usr/lib/perl5/site_perl/5.12.3/x86_64-linux-thread-multi
    /usr/lib/perl5/site_perl/5.12.3
    /usr/lib/perl5/vendor_perl/5.12.3/x86_64-linux-thread-multi
    /usr/lib/perl5/vendor_perl/5.12.3
    /usr/lib/perl5/5.12.3/x86_64-linux-thread-multi
    /usr/lib/perl5/5.12.3
    .

---
Environment for perl 5.12.3:
    HOME=/home/law
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_CTYPE=en_US.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=.:/sbin:/usr/local/sbin:/opt/lsb/bin:/home/law/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin:/usr/lib/qt3/bin:/usr/sbin
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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