[perl #121511] Storable's gcc -O2 hint is obsolete

# New Ticket Created by  Zefram 
# Please include the string:  [perl #121511]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=121511 >



This is a bug report for perl from zefram@fysh.org,
generated with the help of perlbug 1.39 running under perl 5.18.2.


-----------------------------------------------------------------
[Please describe your issue here]

Storable's hints/linux.pl has a note about gcc -O3 causing failures on
unthreaded builds.  I'm using gcc -O3, and by accident the way I'm using
it means that Storable fails to override it.  (I've got -O3 in cccdlflags
as well as optimize, and the compile command line includes both, the
unoverridden -O3 in cccdlflags coming later and so taking precedence.)
I'm not seeing the described problems.

The helpful comment in the hints file refers to some specific and rather
old versions of gcc.  Most likely, the problem that led to this hint
was specific to those older versions and has now been fixed.  If we can
confirm this, and at least roughly bisect it, the overriding hint should
be made conditional on gcc version.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=library
    severity=low
    module=Storable
---
Site configuration information for perl 5.18.2:

Configured by root at Tue Mar 25 13:45:07 UTC 2014.

Summary of my perl5 (revision 5 version 18 subversion 2) configuration:
   
  Platform:
    osname=linux, osvers=2.6.32-5-686, archname=i686-linux-64int-ld
    uname='linux beryllium.photobox.priv 2.6.32-5-686 #1 smp fri may 10 08:33:48 utc 2013 i686 gnulinux '
    config_args='-des -Duseshrplib -Duse64bitint -Duselongdouble -Uusethreads -Uusemultiplicity -Dprefix=/opt/perl-5.18.2-opt -Dsiteprefix=/opt/perl-5.18.2-opt -Dvendorprefix=/opt/perl-5.18.2-opt/vendor -Doptimize=-ggdb -O3 -fbranch-target-load-optimize -fgcse-las -fgcse-sm -fipa-pta -floop-block -floop-interchange -floop-strip-mine -fmodulo-sched -fomit-frame-pointer -freorder-blocks-and-partition -fsched-spec-load -fsched-spec-load-dangerous -ftree-loop-distribution -Dcccdlflags=-fPIC -O3 -pipe'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=undef, uselongdouble=define
    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='-ggdb -O3 -fbranch-target-load-optimize -fgcse-las -fgcse-sm -fipa-pta -floop-block -floop-interchange -floop-strip-mine -fmodulo-sched -fomit-frame-pointer -freorder-blocks-and-partition -fsched-spec-load -fsched-spec-load-dangerous -ftree-loop-distribution',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.7.2', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long long', ivsize=8, nvtype='long double', nvsize=12, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib/i386-linux-gnu /lib/../lib /usr/lib/i386-linux-gnu /usr/lib/../lib /lib /usr/lib
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.13'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/opt/perl-5.18.2-opt/lib/5.18.2/i686-linux-64int-ld/CORE'
    cccdlflags='-fPIC -O3 -pipe', lddlflags='-shared -ggdb -O3 -fbranch-target-load-optimize -fgcse-las -fgcse-sm -fipa-pta -floop-block -floop-interchange -floop-strip-mine -fmodulo-sched -fomit-frame-pointer -freorder-blocks-and-partition -fsched-spec-load -fsched-spec-load-dangerous -ftree-loop-distribution -L/usr/local/lib -fstack-protector'

Locally applied patches:
    

---
@INC for perl 5.18.2:
    /opt/perl-5.18.2-opt/lib/site_perl/5.18.2/i686-linux-64int-ld
    /opt/perl-5.18.2-opt/lib/site_perl/5.18.2
    /opt/perl-5.18.2-opt/vendor/lib/vendor_perl/5.18.2/i686-linux-64int-ld
    /opt/perl-5.18.2-opt/vendor/lib/vendor_perl/5.18.2
    /opt/perl-5.18.2-opt/lib/5.18.2/i686-linux-64int-ld
    /opt/perl-5.18.2-opt/lib/5.18.2
    .

---
Environment for perl 5.18.2:
    HOME=/root
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/opt/perl-5.18.2-opt/bin:/root/pub/i686-pc-linux-gnu/bin:/root/pub/common/bin:/usr/bin:/usr/sbin:/bin:/sbin:/usr/local/bin:/usr/local/sbin:/usr/games:/opt/geoip/bin:/opt/httpd/bin:/opt/perl/bin
    PERL5LIB=
    PERL5OPT=
    PERL5_CPANPLUS_IS_RUNNING=31762
    PERL5_CPAN_IS_RUNNING=31762
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh

• [perl #121511] Storable's gcc -O2 hint is obsolete by Zefram