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[perl #79838] -fstack-protector enabled without any way to disable, even on platforms not supporting it

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From:
perlbug @ plan9 . de
Date:
November 27, 2010 09:54
Subject:
[perl #79838] -fstack-protector enabled without any way to disable, even on platforms not supporting it
Message ID:
rt-3.6.HEAD-13564-1290829401-1562.79838-75-0@perl.org
# New Ticket Created by  perlbug@plan9.de 
# Please include the string:  [perl #79838]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=79838 >



This is a bug report for perl from perlbug@plan9.de,
generated with the help of perlbug 1.39 running under perl 5.12.2.


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

beginning with 5.10.something, perl enforces the use of -fstack-protector,
even when Configure was explicitly told the compiler flags, and there is
no way to switch it off.

unfortunately, gcc supports this flag on most platforms, even if the
underlying support is missing. simple test programs (sucha s the one
used by Configure) might pass, but the generated programs might segfault
or worse (for exmaple, on uclibc systems, all the cast to float tests
segfault).

besides, it would be nice not to enforce the use of certain compiler
flags that are absoltuely unnecessary (perl works fine without
-fstack-protector).

so... please please please make -fstack-protector configurable somehow,
better yet, don't override user-specified flags and/or improve the tets
for platform support.

thanks :)

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=wishlist
---
Site configuration information for perl 5.12.2:

Configured by Marc Lehmann at Mon Nov 22 07:24:35 CET 2010.

Summary of my perl5 (revision 5 version 12 subversion 2) configuration:
   
  Platform:
    osname=linux, osvers=2.6.32-5-amd64, archname=x86_64-linux
    uname='linux cerebro 2.6.32-5-amd64 #1 smp fri sep 17 21:50:19 utc 2010 x86_64 gnulinux '
    config_args='-Duselargefiles -Duse64bitint -Dusemymalloc=n -Dstatic_ext=Fcntl -Dcc=gcc -Dccflags=-ggdb -gdwarf-2 -g3 -Dcppflags=-DPERL_DISABLE_PMC -DPERL_ARENA_SIZE=1048576 -D_GNU_SOURCE  -I/opt/include -Doptimize=-DPERL_DISABLE_PMC -DPERL_ARENA_SIZE=1048576 -D_GNU_SOURCE  -I/opt/include -O6 -fno-strict-aliasing -Dcccdlflags=-fPIC -Dldflags=-L/opt/perl/lib -L/opt/lib -Dlibs=-ldl -lm -lcrypt -Dprefix=/opt/perl -Dprivlib=/opt/perl/lib/perl5 -Darchlib=/opt/perl/lib/perl5 -Dvendorprefix=/opt/perl -Dvendorlib=/opt/perl/lib/perl5 -Dvendorarch=/opt/perl/lib/perl5 -Dsiteprefix=/opt/perl -Dsitelib=/opt/perl/lib/perl5 -Dsitearch=/opt/perl/lib/perl5 -Dsitebin=/opt/perl/bin -Dman1dir=/opt/perl/man/man1 -Dman3dir=/opt/perl/man/man3 -Dsiteman1dir=/opt/perl/man/man1 -Dsiteman3dir=/opt/perl/man/man3 -Dman1ext=1 -Dman3ext=3 -Dpager=/usr/bin/less -Uafs -Uusesfio -Uusenm -Uuseshrplib -Ud_dosuid -Dusethreads=undef -Duse5005threads=undef -Duseithreads=undef -Dusemultiplicity=undef -Demail=per
 l-binary@plan9.de -Dcf_email=perl-binary@plan9.de -Dcf_by=Marc Lehmann -Dlocincpth=/opt/perl/include /opt/include -Dmyhostname=localhost -Dmultiarch=undef -Dbin=/opt/perl/bin -Dxxxusedevel -DxxxDEBUGGING -Dxxxuse_debugging_perl -Dxxxuse_debugmalloc -dEs'
    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='gcc', ccflags ='-ggdb -gdwarf-2 -g3 -fno-strict-aliasing -pipe -I/opt/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-DPERL_DISABLE_PMC -DPERL_ARENA_SIZE=1048576 -D_GNU_SOURCE -I/opt/include -O6 -fno-strict-aliasing',
    cppflags='-DPERL_DISABLE_PMC -DPERL_ARENA_SIZE=1048576 -D_GNU_SOURCE -I/opt/include -ggdb -gdwarf-2 -g3 -fno-strict-aliasing -pipe -I/opt/include'
    ccversion='', gccversion='4.4.5 20100728 (prerelease)', 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='gcc', ldflags ='-L/opt/perl/lib -L/opt/lib -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
    libs=-ldl -lm -lcrypt
    perllibs=-ldl -lm -lcrypt
    libc=/lib/libc-2.11.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.11.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -DPERL_DISABLE_PMC -DPERL_ARENA_SIZE=1048576 -D_GNU_SOURCE -I/opt/include -O6 -fno-strict-aliasing -L/opt/perl/lib -L/opt/lib -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl 5.12.2:
    /root/src/sex
    /opt/perl/lib/perl5
    /opt/perl/lib/perl5
    /opt/perl/lib/perl5
    .

---
Environment for perl 5.12.2:
    HOME=/root
    LANG (unset)
    LANGUAGE (unset)
    LC_CTYPE=en_US.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/root/s2:/root/s:/opt/bin:/opt/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11/bin:/usr/games:/usr/local/bin:/usr/local/sbin:/root/pserv:.
    PERL5LIB=/root/src/sex
    PERL5_CPANPLUS_CONFIG=/root/.cpanplus/config
    PERLDB_OPTS=ornaments=0
    PERL_ANYEVENT_DBI_TESTS=1
    PERL_ANYEVENT_EDNS0=1
    PERL_ANYEVENT_NET_TESTS=1
    PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6
    PERL_ANYEVENT_STRICT=1
    PERL_BADLANG (unset)
    PERL_UNICODE=E
    SHELL=/bin/bash
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