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# New Ticket Created by Dan Collins
# Please include the string: [perl #129851]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/Ticket/Display.html?id=129851 >
While smoking CPAN modules against various versions of Perl, I noticed the
following unexpected failure:
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Bisects to:
bad - non-zero exit from /tmp/lX36LYqWLD/bin/perl -I /home/cpanbisect/.cpan
-MCPAN::MyConfig -MCPAN -e $CPAN::Config->{build_dir}=q{/tmp/ZTufR37XGi};
-e install('Devel::EnforceEncapsulation'); die unless
CPAN::Shell->expand(Module => 'Devel::EnforceEncapsulation')->uptodate;
607ee43568c28c8da9fb4b19d16807dd0214af40 is the first bad commit
commit 607ee43568c28c8da9fb4b19d16807dd0214af40
Author: James Raspass <jraspass@gmail.com>
Date: Wed Jul 15 23:46:20 2015 +0100
Speed up compilation of overload.pm a smidge.
Measured with the following crude perl script calling perf. Perl
is in there to get a rough baseline cost of starting perl:
print 'PERL', (`perf stat -r100 perl -e 1 2>&1`)[10];
print 'OLD ', (`perf stat -r100 perl lib/overload.pm 2>&1`)[10];
print 'NEW ', (`perf stat -r100 perl lib/overload2.pm 2>&1`)[10];
Produced the following results on my machine:
PERL 5,800,051 instructions # 1.05 insns per cycle ( +- 0.06% )
OLD 14,818,995 instructions # 1.16 insns per cycle ( +- 0.03% )
NEW 14,696,974 instructions # 1.16 insns per cycle ( +- 0.03% )
While the numbers did fluctuate between runs, the new code was
consistently faster.
:040000 040000 e92b68c47128f987038e0a5c2c4b99d361a9561e
a587e32369a751d18c0dcf05b2f5a7fca27830ef M lib
bisect run success
That took 2162 seconds.
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Diagnostics attached. Output buffering makes it look like some messages are
coming from the wrong place, here's the "true" output of t/api:
t/api.t ........... 1/52 overload arg '${}' is invalid at (eval 14) line 1.
overload arg '@{}' is invalid at (eval 14) line 1.
overload arg '%{}' is invalid at (eval 14) line 1.
overload arg '&{}' is invalid at (eval 14) line 1.
overload arg '*{}' is invalid at (eval 14) line 1.
overload arg 'fallback' is invalid at (eval 14) line 1.
# Failed test 'no warning on unencapsulated class'
# at t/api.t line 153.
# got: '6'
# expected: '0'
# Failed test '...but it does raise a warning'
# at t/api.t line 159.
# got: '7'
# expected: '1'
# Looks like you failed 2 tests of 52.
t/api.t ........... Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/52 subtests
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Perl -V of a failing perl:
Summary of my perl5 (revision 5 version 25 subversion 6) configuration:
Commit id: 5654fe3cb7747930ab73ec2386527c2d0007459f
Platform:
osname=linux
osvers=3.16.0-4-amd64
archname=x86_64-linux-thread-multi
uname='linux digitalis 3.16.0-4-amd64 #1 smp debian 3.16.36-1+deb8u1
(2016-09-03) x86_64 gnulinux '
config_args='-Dusedevel -DDEBUGGING -Dusethreads
-Dprefix=/home/cpan2/install -Uversiononly -des'
hint=recommended
useposix=true
d_sigaction=define
useithreads=define
usemultiplicity=define
use64bitint=define
use64bitall=define
uselongdouble=undef
usemymalloc=n
bincompat5005=undef
Compiler:
cc='cc'
ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -DDEBUGGING
-fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
optimize='-O2 -g'
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -DDEBUGGING
-fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
ccversion=''
gccversion='4.9.2'
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/4.9/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 -ldl -lm -lcrypt -lutil -lc
perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
libc=libc-2.19.so
so=so
useshrplib=false
libperl=libperl.a
gnulibc_version='2.19'
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags='-Wl,-E'
cccdlflags='-fPIC'
lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector-strong'
Characteristics of this binary (from libperl):
Compile-time options:
DEBUGGING
HAS_TIMES
MULTIPLICITY
PERLIO_LAYERS
PERL_COPY_ON_WRITE
PERL_DONT_CREATE_GVSV
PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
PERL_IMPLICIT_CONTEXT
PERL_MALLOC_WRAP
PERL_OP_PARENT
PERL_PRESERVE_IVUV
PERL_TRACK_MEMPOOL
PERL_USE_DEVEL
USE_64_BIT_ALL
USE_64_BIT_INT
USE_ITHREADS
USE_LARGE_FILES
USE_LOCALE
USE_LOCALE_COLLATE
USE_LOCALE_CTYPE
USE_LOCALE_NUMERIC
USE_LOCALE_TIME
USE_PERLIO
USE_PERL_ATOF
USE_REENTRANT_API
Built under linux
Compiled at Sep 29 2016 16:06:12
%ENV:
PERLBREW_BASHRC_VERSION="0.76"
PERLBREW_HOME="/home/dcollins/.perlbrew"
PERLBREW_ROOT="/home/dcollins/toolchain/perl5"
@INC:
/home/cpan2/install/lib/perl5/site_perl/5.25.6/x86_64-linux-thread-multi
/home/cpan2/install/lib/perl5/site_perl/5.25.6
/home/cpan2/install/lib/perl5/5.25.6/x86_64-linux-thread-multi
/home/cpan2/install/lib/perl5/5.25.6
.
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Happy to provide any other information that may be helpful. Respectfully,
Dan Collins
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