[perl #107350] perlrun problem causing -S switch not to work correctly on FreeBSD 8.2 for perl versions including 5.8-5.12

# New Ticket Created by  ant@ldeo.columbia.edu 
# Please include the string:  [perl #107350]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=107350 >



This is a bug report for perl from ant@ldeo.columbia.edu,
generated with the help of perlbug 1.39 running under perl 5.12.4.


-----------------------------------------------------------------

I have the following two perl-scripts:

printfile:
    #!/usr/bin/perl
    while (<>) {
        print unless m{^#};
    }

printme:
    #!/usr/bin/perl -S printfile
    Hello world!


Both are set to executable and placed somewhere in the $PATH, possibly
in different directories. On most UN*X systems I have access to,
including FreeBSD 5.4, MacOSX 10.*, and a couple of Linux boxes, the
command "printme" will produce "Hello world!". On FreeBSD 8.2, however,
it produces the following error message:

    Can't emulate -S on #! line at ./printme line 1.

I traced the problem and found that on other UN*X systems, "printme"
will lead to execution of "perl -S printfile printme" but on FreeBSD 8.2
the code to be executed is "perl '-S printfile' printme". It appears
that somewhere between FreeBSD 5.4 and 8.2 the semantics of the parsing
of #! was modified and this modification broke the -S switch in perl
when used as above.

I have solved the problem with the following patch in perl versions
5.8.9 and 5.12.4:
    - search for the code:
            case 'S':
                forbid_setid('S', FALSE);
                dosearch = TRUE;
                s++;
                goto reswitch;
    - and insert the following just before the goto:
            #if 1
               { char *s1 = s;
                  while (isSPACE(*s1)) s1++;
                  argv[0] = s1;
                  argc++; argv--;
               }
            #endif

I believe that this patch is innocuous for perl running on other
systems, although there may be issues if there are systems that support
quotation in #! lines. 

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl 5.12.4:

Configured by root at Wed Dec  7 18:35:25 UTC 2011.

Summary of my perl5 (revision 5 version 12 subversion 4) configuration:
   
  Platform:
    osname=freebsd, osvers=8.2-release-p3, archname=amd64-freebsd
    uname='freebsd whoosher.ldeo.columbia.edu 8.2-release-p3 freebsd 8.2-release-p3 #0: tue sep 27 18:45:57 utc 2011 root@amd64-builder.daemonology.net:usrobjusrsrcsysgeneric amd64 '
    config_args='-sde -Dprefix=/usr/local -Darchlib=/usr/local/lib/perl5/5.12.4/mach -Dprivlib=/usr/local/lib/perl5/5.12.4 -Dman3dir=/usr/local/lib/perl5/5.12.4/perl/man/man3 -Dman1dir=/usr/local/man/man1 -Dsitearch=/usr/local/lib/perl5/site_perl/5.12.4/mach -Dsitelib=/usr/local/lib/perl5/site_perl/5.12.4 -Dscriptdir=/usr/local/bin -Dsiteman3dir=/usr/local/lib/perl5/5.12.4/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Ui_malloc -Ui_iconv -Uinstallusrbinperl -Dcc=cc -Duseshrplib -Dinc_version_list=none -Dccflags=-DAPPLLIB_EXP="/usr/local/lib/perl5/5.12.4/BSDPAN" -Doptimize=-O2 -pipe -fno-strict-aliasing -Ui_gdbm -Dusethreads=n -Dusemymalloc=n -Duse64bitint'
    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 ='-DAPPLLIB_EXP="/usr/local/lib/perl5/5.12.4/BSDPAN" -DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
    optimize='-O2 -pipe -fno-strict-aliasing',
    cppflags='-DAPPLLIB_EXP="/usr/local/lib/perl5/5.12.4/BSDPAN" -DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.2.1 20070719  [FreeBSD]', 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 =' -Wl,-E  -fstack-protector -L/usr/local/lib'
    libpth=/usr/lib /usr/local/lib
    libs=-lm -lcrypt -lutil
    perllibs=-lm -lcrypt -lutil
    libc=, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='  -Wl,-R/usr/local/lib/perl5/5.12.4/mach/CORE'
    cccdlflags='-DPIC -fPIC', lddlflags='-shared  -L/usr/local/lib -fstack-protector'

Locally applied patches:
    

---
@INC for perl 5.12.4:
    /usr/local/lib/perl5/5.12.4/BSDPAN
    /usr/local/lib/perl5/site_perl/5.12.4/mach
    /usr/local/lib/perl5/site_perl/5.12.4
    /usr/local/lib/perl5/5.12.4/mach
    /usr/local/lib/perl5/5.12.4
    .

---
Environment for perl 5.12.4:
    HOME=/home/ant
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/ant/bin:/home/ant/ANTS/bin:/usr/local/gmt/bin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/home/ant/bin:./bin:.
    PERL_BADLANG (unset)
    PERL_RL= o=0
    SHELL=/usr/local/bin/ksh93

• [perl #107350] perlrun problem causing -S switch not to work correctly on FreeBSD 8.2 for perl versions including 5.8-5.12 by ant @ ldeo . columbia . edu
• Re: [perl #107350] perlrun problem causing -S switch not to workcorrectly on FreeBSD 8.2 for perl versions including 5.8-5.12 by Zefram