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[perl #54590] "Can't take log of 0" error in perl 5.8.8. 64 bit

From:
Lourdes Peña Castillo
Date:
May 21, 2008 12:00
Subject:
[perl #54590] "Can't take log of 0" error in perl 5.8.8. 64 bit
Message ID:
rt-3.6.HEAD-11257-1211390087-913.54590-75-0@perl.org
# New Ticket Created by  "Lourdes Peña Castillo" 
# Please include the string:  [perl #54590]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=54590 >


Hi,

If I run the following code in  perl  v5.8.8 built for
x86_64-linux-thread-multi, l get the error "Can't take log of 0 at - line
1."

perl
print log(2.5e-310)/log(10);
^D

But if I run it in perl v5.8.7 built for i486-linux-gnu-thread-multi, I get
the answer -309.602059991328.

Is this  a known issue with perl 5.8.8. for 64bits? Thanks!

Here is the perl -V info:

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=linux, osvers=2.6.9-55.0.9.elsmp,
archname=x86_64-linux-thread-multi
    uname='linux hs20-bc1-7.build.redhat.com 2.6.9-55.0.9.elsmp #1 smp tue
sep 25 02:16:15 edt 2007 x86_64 x86_64 x86_64 gnulinux '
    config_args='-des -Doptimize=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic
-Dversion=5.8.8 -Dmyhostname=localhost -Dperladmin=root@localhost -Dcc=gcc
-Dcf_by=Red Hat, Inc. -Dinstallprefix=/usr -Dprefix=/usr
-Dlibpth=/usr/local/lib64 /lib64 /usr/lib64 -Dprivlib=/usr/lib/perl5/5.8.8
-Dsitelib=/usr/lib/perl5/site_perl/5.8.8
-Dvendorlib=/usr/lib/perl5/vendor_perl/5.8.8
-Darchlib=/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi
-Dsitearch=/usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi
-Dvendorarch=/usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi
-Darchname=x86_64-linux -Dvendorprefix=/usr -Dsiteprefix=/usr -Duseshrplib
-Dusethreads -Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun
-Di_db -Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio
-Dinstallusrbinperl=n -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less
-isr -Dd_gethostent_r_proto -Ud_endhostent_r_proto -Ud_sethostent_r_proto
-Ud_endprotoent_r_proto -Ud_setprotoent_r_proto -Ud_endservent_r_proto
-Ud_setservent_r_proto -Dinc_version_list=5.8.7 5.8.6 5.8.5
-Dscriptdir=/usr/bin'
    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=define use64bitall=define uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing
-pipe -Wdeclaration-after-statement -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
    optimize='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe
-Wdeclaration-after-statement -I/usr/local/include -I/usr/include/gdbm'
    ccversion='', gccversion='4.1.1 20070105 (Red Hat 4.1.1-52)',
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='gcc', ldflags =''
    libpth=/usr/local/lib64 /lib64 /usr/lib64
    libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E
-Wl,-rpath,/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic'


Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT
                        PERL_MALLOC_WRAP USE_64_BIT_ALL USE_64_BIT_INT
                        USE_ITHREADS USE_LARGE_FILES USE_PERLIO
                        USE_REENTRANT_API
  Built under linux
  Compiled at Oct 23 2007 12:21:53
  @INC:
    /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi
    /usr/lib64/perl5/site_perl/5.8.7/x86_64-linux-thread-multi
    /usr/lib64/perl5/site_perl/5.8.6/x86_64-linux-thread-multi
    /usr/lib64/perl5/site_perl/5.8.5/x86_64-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.8
    /usr/lib/perl5/site_perl/5.8.7
    /usr/lib/perl5/site_perl/5.8.6
    /usr/lib/perl5/site_perl/5.8.5
    /usr/lib/perl5/site_perl
    /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi
    /usr/lib64/perl5/vendor_perl/5.8.7/x86_64-linux-thread-multi
    /usr/lib64/perl5/vendor_perl/5.8.6/x86_64-linux-thread-multi
    /usr/lib64/perl5/vendor_perl/5.8.5/x86_64-linux-thread-multi
    /usr/lib/perl5/vendor_perl/5.8.8
    /usr/lib/perl5/vendor_perl/5.8.7
    /usr/lib/perl5/vendor_perl/5.8.6
    /usr/lib/perl5/vendor_perl/5.8.5
    /usr/lib/perl5/vendor_perl
    /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi
    /usr/lib/perl5/5.8.8
    .



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