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This queue is for tickets about the Devel-Cover CPAN distribution.

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The Basics
Id: 67718
Status: open
Priority: 0/
Queue: Devel-Cover

Owner: Nobody in particular
Requestors: td091116 [...]

Bug Information
Severity: Normal
Broken in:
  • 0.66
  • 0.76
Fixed in: (no value)

Subject: perl subprocesses with "-e" scripts fail (perl -MDevel::Cover -e)
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I have some tests runing small Perl scripts created as command-line script passed on with "-e". They run fine as normal tests, but when I try to check the coverage they fail. What the test harness does is basically calling perl with Devel::Cover as preloaded module. And trying the same also fails, e.g. with the following simple test: perl -MDevel::Cover -e 'print "Hello World.\n";' I tried to track this down in the debugger but so far failed to get an early enough breakpoint. So unfortunately I can only supply a test (I placed it into t/internal) showing the problem, but not a solution.
Subject: subprocess.t
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# standalone test: perl -Iblib/arch -Iblib/lib t/internal/subprocess.t use strict; use warnings; use Test::More; use Test::Warn; use Devel::Cover "-silent", 1; if ($] < 5.008000) { plan skip_all => "Test requires perl 5.8.0 or greater"; } else { plan tests => 2; } my $cmd = "perl -e 'print \"Hello World.\\n\"'"; my $output = `$cmd 2>&1`; is($output, "Hello World.\n", 'simple test with perl -e'); $cmd = "perl -MDevel::Cover -e 'print \"Hello World.\\n\"'"; $output = `$cmd 2>&1`; is($output, "Hello World.\n", 'test with perl -MDevel::Cover -e');
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I've added this test and it is passing. Is there anything special you were doing which might cause it to fail?
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So far I've no idea about anything special in my environment. I can reproduce it in a simple shell without any special environment variables set: ~> env | fgrep -i perl ~> perl -MDevel::Cover -e 'print "Hello World.\n";' Devel::Cover 0.66: Collecting coverage data for branch, condition, pod, statement, subroutine and time. Selecting packages matching: Ignoring packages matching: /Devel/Cover[./] Ignoring packages in: . /etc/perl /usr/lib/perl/5.10.1 /usr/lib/perl5 /usr/local/lib/perl/5.10.1 /usr/local/lib/site_perl /usr/local/share/perl/5.10.1 /usr/share/perl/5.10.1 /usr/share/perl5 Devel::Cover: Can't find file "-e" (-e): ignored. Hello World. Devel::Cover: Writing coverage database to /home/dorner/cover_db/runs/1305568713.13033.32661 I've attached the output of perl -V (OS is an Ubuntu 10.10). Maybe it's something in the interpreter itself? Any idea what else I can look for?
Subject: perl-V.out
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Summary of my perl5 (revision 5 version 10 subversion 1) configuration: Platform: osname=linux, osvers=2.6.24-28-server, archname=x86_64-linux-gnu-thread-multi uname='linux allspice 2.6.24-28-server #1 smp wed aug 18 21:17:51 utc 2010 x86_64 gnulinux ' config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.10.1 -Dsitearch=/usr/local/lib/perl/5.10.1 -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 -Ud_ualarm -Uusesfio -Uusenm -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib -Dd_dosuid -des' 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 -DDEBIAN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2 -g', cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='', gccversion='4.4.5', 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 =' -fstack-protector -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64 libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt perllibs=-ldl -lm -lpthread -lc -lcrypt libc=/lib/, so=so, useshrplib=true, gnulibc_version='2.12.1' 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' Characteristics of this binary (from libperl): Compile-time options: MULTIPLICITY PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP USE_64_BIT_ALL USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API Locally applied patches: DEBPKG:debian/arm_thread_stress_timeout - Raise the timeout of ext/threads/shared/t/stress.t to accommodate slower build hosts DEBPKG:debian/cpan_config_path - Set location of CPAN::Config to /etc/perl as /usr may not be writable. DEBPKG:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS default for modules installed from CPAN. DEBPKG:debian/db_file_ver - Remove overly restrictive DB_File version check. DEBPKG:debian/doc_info - Replace generic man(1) instructions with Debian-specific information. DEBPKG:debian/enc2xs_inc - Tweak enc2xs to follow symlinks and ignore missing @INC directories. DEBPKG:debian/errno_ver - Remove Errno version check due to upgrade problems with long-running processes. DEBPKG:debian/extutils_hacks - Various debian-specific ExtUtils changes DEBPKG:debian/fakeroot - Postpone LD_LIBRARY_PATH evaluation to the binary targets. DEBPKG:debian/instmodsh_doc - Debian policy doesn't install .packlist files for core or vendor. DEBPKG:debian/ld_run_path - Remove standard libs from LD_RUN_PATH as per Debian policy. DEBPKG:debian/libnet_config_path - Set location of libnet.cfg to /etc/perl/Net as /usr may not be writable. DEBPKG:debian/m68k_thread_stress - Disable some threads tests on m68k for now due to missing TLS. DEBPKG:debian/mod_paths - Tweak @INC ordering for Debian DEBPKG:debian/module_build_man_extensions - Adjust Module::Build manual page extensions for the Debian Perl policy DEBPKG:debian/perl_synopsis - Rearrange perl.pod DEBPKG:debian/prune_libs - Prune the list of libraries wanted to what we actually need. DEBPKG:debian/use_gdbm - Explicitly link against -lgdbm_compat in ODBM_File/NDBM_File. DEBPKG:fixes/assorted_docs - [384f06a] Math::BigInt::CalcEmu documentation grammar fix DEBPKG:fixes/net_smtp_docs - [ #36038] Document the Net::SMTP 'Port' option DEBPKG:fixes/processPL - [ #17224] Always use PERLRUNINST when building perl modules. DEBPKG:debian/perlivp - Make perlivp skip include directories in /usr/local DEBPKG:fixes/pod2man-index-backslash - Escape backslashes in .IX entries DEBPKG:debian/disable-zlib-bundling - Disable zlib bundling in Compress::Raw::Zlib DEBPKG:fixes/kfreebsd_cppsymbols - [3b910a0] Add gcc predefined macros to $Config{cppsymbols} on GNU/kFreeBSD. DEBPKG:debian/cpanplus_definstalldirs - Configure CPANPLUS to use the site directories by default. DEBPKG:debian/cpanplus_config_path - Save local versions of CPANPLUS::Config::System into /etc/perl. DEBPKG:fixes/kfreebsd-filecopy-pipes - [16f708c] Fix File::Copy::copy with pipes on GNU/kFreeBSD DEBPKG:fixes/anon-tmpfile-dir - [perl #66452] Honor TMPDIR when open()ing an anonymous temporary file DEBPKG:fixes/abstract-sockets - [89904c0] Add support for Abstract namespace sockets. DEBPKG:fixes/hurd_cppsymbols - [eeb92b7] Add gcc predefined macros to $Config{cppsymbols} on GNU/Hurd. DEBPKG:fixes/autodie-flock - Allow for flock returning EAGAIN instead of EWOULDBLOCK on linux/parisc DEBPKG:fixes/archive-tar-instance-error - [ #48879] Separate Archive::Tar instance error strings from each other DEBPKG:fixes/positive-gpos - [perl #69056] [c584a96] Fix \G crash on first match DEBPKG:debian/devel-ppport-ia64-optim - Work around an ICE on ia64 DEBPKG:fixes/trie-logic-match - [perl #69973] [0abd0d7] Fix a DoS in Unicode processing [CVE-2009-3626] DEBPKG:fixes/hppa-thread-eagain - make the threads-shared test suite more robust, fixing failures on hppa DEBPKG:fixes/crash-on-undefined-destroy - [perl #71952] [1f15e67] Fix a NULL pointer dereference when looking for a DESTROY method DEBPKG:fixes/tainted-errno - [perl #61976] [be1cf43] fix an errno stringification bug in taint mode DEBPKG:patchlevel - List packaged patches for 5.10.1-12 in patchlevel.h Built under linux Compiled at Apr 22 2011 19:21:23 @INC: /etc/perl /usr/local/lib/perl/5.10.1 /usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 .
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Aha - I think I see the problem. You need to tell Devel::Cover to shut up: $ perl -MDevel::Cover=-silent,1 -e 'print "Hello World.\n";' That should do the trick. I'm going to close this ticket, but if I have misunderstood or that doesn't keep Devel::Cover quiet, please reopen it. And your test is in anyway to ensure it keeps working. Thanks,
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Test coverage of my module now works correctly when I start it with HARNESS_PERL_SWITCHES=-MDevel::Cover=-silent,1 make test instead of HARNESS_PERL_SWITCHES=-MDevel::Cover make test But I've no idea how to do that correctly when I use Build (Build.PL) instead of make (Makefile.PL). I assume when I call "./Build testcov" this sets HARNESS_PERL_SWITCHES internally itself regardless to what I do outside. Any idea? Or should I forward this to Module::Build? (And the documentation of Devel::Cover said setting HARNESS_PERL_SWITCHES would automatically set silent?)

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