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# New Ticket Created by Niko Tyni
# Please include the string: [perl #130133]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/Ticket/Display.html?id=130133 >
This is a bug report for perl from Niko Tyni <ntyni@debian.org>,
generated with the help of perlbug 1.40 running under perl 5.25.7.
-----------------------------------------------------------------
[Please describe your issue here]
The Configure test for long double implementation details probes the
contents of "long double inf", and they get stored in the Config module:
% perl -V:longdblinfbytes
longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xff, 0x7f, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00';
Some of these bytes are currently essentially random and vary between
builds on at least amd64 and i386, because their long doubles are only
80-bit and the remaining six bytes stay uninitialized.
The relevant Configure probe tries to initialize these bytes, but has
several bugs that defeat the purpose. Patch attached.
The randomness seems to only have started to show on Debian with GCC-6
for one reason or another; the bytes are zeroed out on at least GCC-5.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=low
Type=Patch
PatchStatus=HasPatch
---
Site configuration information for perl 5.25.7:
Configured by niko at Fri Nov 18 19:58:21 EET 2016.
Summary of my perl5 (revision 5 version 25 subversion 7) configuration:
Commit id: 97eaa8936166129d88f778562e587a9151ce15b7
Platform:
osname=linux
osvers=4.8.0-1-amd64
archname=x86_64-linux
uname='linux estella 4.8.0-1-amd64 #1 smp debian 4.8.5-1 (2016-10-28) x86_64 gnulinux '
config_args='-des -Dusedevel'
hint=recommended
useposix=true
d_sigaction=define
useithreads=undef
usemultiplicity=undef
use64bitint=define
use64bitall=define
uselongdouble=undef
usemymalloc=n
bincompat5005=undef
Compiler:
cc='cc'
ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
optimize='-O2'
cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
ccversion=''
gccversion='6.2.0 20161103'
gccosandvers=''
intsize=4
longsize=8
ptrsize=8
doublesize=8
byteorder=12345678
doublekind=3
d_longlong=define
longlongsize=8
d_longdbl=define
longdblsize=16
longdblkind=3
ivtype='long'
ivsize=8
nvtype='double'
nvsize=8
Off_t='off_t'
lseeksize=8
alignbytes=8
prototype=define
Linker and Libraries:
ld='cc'
ldflags =' -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/6/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
libc=libc-2.24.so
so=so
useshrplib=false
libperl=libperl.a
gnulibc_version='2.24'
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags='-Wl,-E'
cccdlflags='-fPIC'
lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'
---
@INC for perl 5.25.7:
lib
/usr/local/lib/perl5/site_perl/5.25.7/x86_64-linux
/usr/local/lib/perl5/site_perl/5.25.7
/usr/local/lib/perl5/5.25.7/x86_64-linux
/usr/local/lib/perl5/5.25.7
---
Environment for perl 5.25.7:
HOME=/home/niko
LANG=en_US.UTF-8
LANGUAGE (unset)
LC_CTYPE=fi_FI.UTF-8
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/niko/bin:/home/niko/bin:/home/niko/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/sbin:/usr/sbin:/sbin:/usr/sbin
PERL_BADLANG (unset)
SHELL=/bin/zsh
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