perlbrew should manage PERL5LIB/PERL_MM_OPT/PERL_MB_OPT

[KES777]

Before perlbrew I use this variables to install perl and perl libs into $HOME.
I do next in `~/.bashrc

export PERL_MB_OPT="--install_base \"/home/kes/perl5\""
export PERL_MM_OPT="INSTALL_BASE=/home/kes/perl5"
export PERL5LIB='/home/kes/perl5/lib/perl5'

So when I install module I install it into my $HOME and do not interfere with system perl.
But now I need to install perl-5.12 and I use perlbrew
This variables cause some problems and perl segfaults because of mix of my local modules and perlbrew's. Also I note that under perlbrew modules are installed into my local dir, not perlbrew's one. And this break my local perl.

perl: symbol lookup error: /home/kes/perl5/lib/perl5/x86_64-linux/auto/Guard/Guard.so: undefined symbol: Perl_xs_handshake

Here I switch to use perl-5.12.5 and install module:

$ env | grep PERL
PERLBREW_VERSION=0.75
PERLBREW_PERL=perl-5.12.5
PERL5LIB=/home/kes/work/projects/perl_libs/lib:/home/kes/perl5/lib/perl5
PERL_MB_OPT=--install_base "/home/kes/perl5"
PERLBREW_ROOT=/home/kes/perl5/perlbrew
PERLBREW_MANPATH=/home/kes/perl5/perlbrew/perls/perl-5.12.5/man
PERLBREW_SKIP_INIT=1
PERL_LOCAL_LIB_ROOT=
PERLBREW_LIB=
PERLBREW_PATH=/home/kes/perl5/perlbrew/bin:/home/kes/perl5/perlbrew/perls/perl-5.12.5/bin
PERL_MM_OPT=INSTALL_BASE=/home/kes/perl5
kes@keswork ~/work/projects/perl_libs $ ./Build install
Building Devel-DebugHooks
Installing /home/kes/perl5/lib/perl5/Devel/ImportArgs.pm
Installing /home/kes/perl5/lib/perl5/Devel/PkgAtCompileTime.pm
Installing /home/kes/perl5/lib/perl5/Devel/KillPrint_scope.pm
Installing /home/kes/perl5/lib/perl5/Devel/KillPrintTest.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/TraceAccess.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/Commands.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/CmdProcessor.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/KillPrint.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/Terminal.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/Server.pm
Installing /home/kes/perl5/lib/perl5/Devel/DebugHooks/Guides/DebugHooks.pod
Installing /home/kes/perl5/man/man3/Devel::DebugHooks.3pm
Installing /home/kes/perl5/bin/dclient.pl
kes@keswork ~/work/projects/perl_libs $ which perl
/home/kes/perl5/perlbrew/perls/perl-5.12.5/bin/perl
kes@keswork ~/work/projects/perl_libs $ perl -V
Summary of my perl5 (revision 5 version 12 subversion 5) configuration:

  Platform:
    osname=linux, osvers=3.13.0-37-generic, archname=x86_64-linux
    uname='linux keswork 3.13.0-37-generic #64-ubuntu smp mon sep 22 21:28:38 utc 2014 x86_64 x86_64 x86_64 gnulinux '
    config_args='-de -Dprefix=/home/kes/perl5/perlbrew/perls/perl-5.12.5 -Aeval:scriptdir=/home/kes/perl5/perlbrew/perls/perl-5.12.5/bin'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.8.4', 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/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /usr/lib
    libs=-lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-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 -L/usr/local/lib -fstack-protector'


Characteristics of this binary (from libperl): 
  Compile-time options: PERL_DONT_CREATE_GVSV PERL_MALLOC_WRAP USE_64_BIT_ALL
                        USE_64_BIT_INT USE_LARGE_FILES USE_PERLIO
                        USE_PERL_ATOF
  Locally applied patches:
    Devel::PatchPerl 1.38
  Built under linux
  Compiled at Jun  5 2016 13:43:02
  %ENV:
    PERL5LIB="/home/kes/work/projects/perl_libs/lib:/home/kes/perl5/lib/perl5"
    PERLBREW_LIB=""
    PERLBREW_MANPATH="/home/kes/perl5/perlbrew/perls/perl-5.12.5/man"
    PERLBREW_PATH="/home/kes/perl5/perlbrew/bin:/home/kes/perl5/perlbrew/perls/perl-5.12.5/bin"
    PERLBREW_PERL="perl-5.12.5"
    PERLBREW_ROOT="/home/kes/perl5/perlbrew"
    PERLBREW_SKIP_INIT="1"
    PERLBREW_VERSION="0.75"
    PERL_LOCAL_LIB_ROOT=""
    PERL_MB_OPT="--install_base "/home/kes/perl5""
    PERL_MM_OPT="INSTALL_BASE=/home/kes/perl5"
  @INC:
    /home/kes/work/projects/perl_libs/lib
    /home/kes/perl5/lib/perl5/x86_64-linux
    /home/kes/perl5/lib/perl5
    /home/kes/perl5/perlbrew/perls/perl-5.12.5/lib/site_perl/5.12.5/x86_64-linux
    /home/kes/perl5/perlbrew/perls/perl-5.12.5/lib/site_perl/5.12.5
    /home/kes/perl5/perlbrew/perls/perl-5.12.5/lib/5.12.5/x86_64-linux
    /home/kes/perl5/perlbrew/perls/perl-5.12.5/lib/5.12.5
    .

It seems perlbrew should check PERL5LIB/PERL_MM_OPT/PERL_MB_OPT and alter them to make things work correct.

Seems related: #414 #325 #387 #479 #211

[KES777]

Just for reference: http://stackoverflow.com/questions/5447595/perlbrew-and-locallib-at-the-same-time

[shadowcat-mst]

You should be using 'perlbrew lib' to have per-perlbrew local::libs.

Stacking local::lib outside perlbrew doesn't make any sense since local::lib is per perl.

Please use the already written perlbrew local::lib support.

[KES777]

It seems should be first thing to remove PERL5LIB/PERL_MM_OPT/PERL_MB_OPT from .bashrc before start to use perlbrew.

Sad that it was not mentioned in the DOC.

[gugod]

I also second what @shadowcat-mst says: "local::lib is per perl".

What we could do here is maybe just detecting the this 3-var settings of local::lib and produce some warn in bashrc (bootstrap time). PERL_MM_OPT / PERL_MB_OPT might contain other values you might want to passthru to cpan.

[shadowcat-mst]

On Mon, Jun 06, 2016 at 02:58:02PM -0700, Kang-min Liu wrote:

I also second what @shadowcat-mst says: "local::lib is per perl".

What we could do here is maybe just detecting the this 3-var settings of local::lib and produce some warn in bashrc (bootstrap time). PERL_MM_OPT / PERL_MB_OPT might contain other values you might want to passthru to cpan.

Detecting PERL_LOCAL_LIB_ROOT seems like maybe it would work?

Though I do wonder if e.g. PERL5LIB is likely to be a footgun even sans a full
local::lib setup

Matt S Trout - Shadowcat Systems - Perl consulting with a commit bit and a clue

http://shadowcat.co.uk/blog/matt-s-trout/ http://twitter.com/shadowcat_mst/

Email me now on mst (at) shadowcat.co.uk and let's chat about how our CPAN
commercial support, training and consultancy packages could help your team.