From fge7z@virginia.edu

Hello,

When diagnostics is in use, calling warn() or die() with a string
consiting of only newlines will cause perl to print lots of warnings.

  $ perl -e 'use diagnostics; warn "\n";'
Use of uninitialized value in substitution (s///) at
/usr/share/perl/5.8/diagnostics.pm line 576.
Use of uninitialized value in study at (eval 1) line 3.
Use of uninitialized value in substitution (s///) at (eval 1) line 4.
Use of uninitialized value in substitution (s///) at (eval 1) line 7.
Use of uninitialized value in substitution (s///) at (eval 1) line 10.
Use of uninitialized value in substitution (s///) at (eval 1) line 13.
Use of uninitialized value in substitution (s///) at (eval 1) line 16.
Use of uninitialized value in substitution (s///) at (eval 1) line 19.
Use of uninitialized value in substitution (s///) at (eval 1) line 22.
[snip]
  $

This is true for any number of newlines. Any non-newline character in the
string will make the diagnostics perform as expected.

  $ perl -e 'use diagnostics; warn "\r\n";'

  $

Perhaps the 'return unless defined' in splainthis() (shown below) should
not be commented out?

sub splainthis {
  return 0 if $TRACEONLY;
  local $_ = shift;
  local $\;
  ### &finish_compilation unless %msg;
  s/\.?\n+$//;
  my $orig = $_;
  # return unless defined;

  [snip]

Cheers,
Fitz

Flags:
     category=core
     severity=low

Site configuration information for perl v5.8.8:

Configured by Debian Project at Tue Apr  4 22:34:25 UTC 2006.

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
   Platform:
     osname=linux, osvers=2.6.15.4, archname=i486-linux-gnu-thread-multi
     uname='linux ninsei 2.6.15.4 #1 smp preempt mon feb 20 09:48:53 pst 
2006 i686 gnulinux '
     config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN 
-Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr 
-Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 
-Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 
-Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local 
-Dsitelib=/usr/local/share/perl/5.8.8 -Dsitearch=/usr/local/lib/perl/5.8.8 
-Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 
-Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 
-Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh 
-Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.8 -Dd_dosuid -des'
     hint=recommended, useposix=true, d_sigaction=define
     usethreads=define use5005threads=undef 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 ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS 
-DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include 
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
     optimize='-O2',
     cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN 
-fno-strict-aliasing -pipe -I/usr/local/include'
     ccversion='', gccversion='4.0.3 (Debian 4.0.3-1)', gccosandvers=''
     intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
     d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
     ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', 
lseeksize=8
     alignbytes=4, prototype=define
   Linker and Libraries:
     ld='cc', ldflags =' -L/usr/local/lib'
     libpth=/usr/local/lib /lib /usr/lib
     libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
     perllibs=-ldl -lm -lpthread -lc -lcrypt
     libc=/lib/libc-2.3.6.so, so=so, useshrplib=true, 
libperl=libperl.so.5.8.8
     gnulibc_version='2.3.6'
   Dynamic Linking:
     dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
     cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:



@INC for perl v5.8.8:
     /etc/perl
     /usr/local/lib/perl/5.8.8
     /usr/local/share/perl/5.8.8
     /usr/lib/perl5
     /usr/share/perl5
     /usr/lib/perl/5.8
     /usr/share/perl/5.8
     /usr/local/lib/site_perl
     /usr/local/lib/perl/5.8.7
     /usr/local/share/perl/5.8.7
     /usr/local/lib/perl/5.8.4
     /usr/local/share/perl/5.8.4
     /usr/local/lib/perl/5.8.3
     /usr/local/share/perl/5.8.3
     /usr/local/lib/perl/5.8.2
     /usr/local/share/perl/5.8.2
     .


Environment for perl v5.8.8:
     HOME=/home/felliott
     LANG=en_US.UTF-8
     LANGUAGE (unset)
     LD_LIBRARY_PATH (unset)
     LOGDIR (unset)

PATH=/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/home/felliott/bin
     PERL_BADLANG (unset)
     SHELL=/bin/bash

From @iabyn

On Mon, May 15, 2006 at 12​:46​:59PM -0700, Fitz Elliott wrote​:

When diagnostics is in use, calling warn() or die() with a string
consiting of only newlines will cause perl to print lots of warnings.

$ perl -e 'use diagnostics; warn "\n";'
Use of uninitialized value in substitution (s///) at
/usr/share/perl/5.8/diagnostics.pm line 576.
Use of uninitialized value in study at (eval 1) line 3.
Use of uninitialized value in substitution (s///) at (eval 1) line 4.
Use of uninitialized value in substitution (s///) at (eval 1) line 7.
Use of uninitialized value in substitution (s///) at (eval 1) line 10.
Use of uninitialized value in substitution (s///) at (eval 1) line 13.
Use of uninitialized value in substitution (s///) at (eval 1) line 16.
Use of uninitialized value in substitution (s///) at (eval 1) line 19.
Use of uninitialized value in substitution (s///) at (eval 1) line 22.
[snip]
$

This is true for any number of newlines. Any non-newline character in the
string will make the diagnostics perform as expected.

$ perl -e 'use diagnostics; warn "\r\n";'

$

Perhaps the 'return unless defined' in splainthis() (shown below) should
not be commented out?

sub splainthis {
return 0 if $TRACEONLY;
local $_ = shift;
local $\;
### &finish_compilation unless %msg;
s/\.?\n+$//;
my $orig = $_;
# return unless defined;

thansk for the report. I';ve fixed this in the developement version of
perl with the change below; simjilar to, but not quite what you suggest.

--
A power surge on the Bridge is rapidly and correctly diagnosed as a faulty
capacitor by the highly-trained and competent engineering staff.
  -- Things That Never Happen in "Star Trek" #9
 
Change 28231 by davem@​davem-splatty on 2006/05/19 00​:14​:15

  [perl #39141] lots of warnings with diagnostics and (warn or die)
  stop C<use diagnostics; warn "\n"> outputing lots of 'uninit'
  warnings.

Affected files ...

... //depot/perl/lib/diagnostics.pm#39 edit

Differences ...

==== //depot/perl/lib/diagnostics.pm#39 (xtext) ====

@​@​ -562,6 +562,7 @​@​
  # but be aware of messsages containing " at this-or-that"
  my $real = 0;
  my @​secs = split( / at / );
+ return unless @​secs;
  $_ = $secs[0];
  for my $i ( 1..$#secs ){
  if( $secs[$i] =~ /.+? (?​:line|chunk) \d+/ ){

The RT System itself - Status changed from 'new' to 'open'

@iabyn - Status changed from 'open' to 'resolved'