path: root/hints/solaris_2.sh

# hints/solaris_2.sh
# Last modified:  Tue Apr 13 13:12:49 EDT 1999
# Andy Dougherty  <doughera@lafayette.edu>
# Based on input from lots of folks, especially
# Dean Roehrich <roehrich@ironwood-fddi.cray.com>

# If perl fails tests that involve dynamic loading of extensions, and
# you are using gcc, be sure that you are NOT using GNU as and ld.  One
# way to do that is to invoke Configure with
# 
#     sh Configure -Dcc='gcc -B/usr/ccs/bin/'
#
#  (Note that the trailing slash is *required*.)
#  gcc will occasionally emit warnings about "unused prefix", but
#  these ought to be harmless.  See below for more details.
 
# See man vfork.
usevfork=false

d_suidsafe=define

# Avoid all libraries in /usr/ucblib.
set `echo $glibpth | sed -e 's@/usr/ucblib@@'`
glibpth="$*"

# Remove bad libraries.  -lucb contains incompatible routines.
# -lld doesn't do anything useful.
# -lmalloc can cause a problem with GNU CC & Solaris.  Specifically,
# libmalloc.a may allocate memory that is only 4 byte aligned, but
# GNU CC on the Sparc assumes that doubles are 8 byte aligned.
# Thanks to  Hallvard B. Furuseth <h.b.furuseth@usit.uio.no>
set `echo " $libswanted " | sed -e 's@ ld @ @' -e 's@ malloc @ @' -e 's@ ucb @ @'`
libswanted="$*"

# Look for architecture name.  We want to suggest a useful default.
case "$archname" in
'')
    if test -f /usr/bin/arch; then
        archname=`/usr/bin/arch`
    	archname="${archname}-${osname}"
    elif test -f /usr/ucb/arch; then
        archname=`/usr/ucb/arch`
    	archname="${archname}-${osname}"
    fi
    ;;
esac

######################################################
# General sanity testing.  See below for excerpts from the Solaris FAQ.

# From roehrich@ironwood-fddi.cray.com Wed Sep 27 12:51:46 1995
# Date: Thu, 7 Sep 1995 16:31:40 -0500
# From: Dean Roehrich <roehrich@ironwood-fddi.cray.com>
# To: perl5-porters@africa.nicoh.com
# Subject: Re: On perl5/solaris/gcc

# Here's another draft of the perl5/solaris/gcc sanity-checker. 

test -z "`${cc:-cc} -V 2>&1|grep -i workshop`" || ccisworkshop="$define"
test -z "`${cc:-cc} -v 2>&1|grep -i gcc`"      || ccisgcc="$define"

case "$ccisworkshop" in
"$define")
	cat >try.c <<EOF
#include <sunmath.h>
int main() { return(0); }
EOF
	workshoplibs=`cc -### try.c -lsunmath -o try 2>&1|grep " -Y "|sed 's%.* -Y "P,\(.*\)".*%\1%'|tr ':' '\n'|grep '/SUNWspro/'|sort -u`
	loclibpth="$loclibpth $workshoplibs"
	;;
esac

case `type ${cc:-cc}` in
*/usr/ucb/cc*) cat <<END >&4

NOTE:  Some people have reported problems with /usr/ucb/cc.  
If you have difficulties, please make sure the directory
containing your C compiler is before /usr/ucb in your PATH.

END
;;
esac


# Check that /dev/fd is mounted.  If it is not mounted, let the
# user know that suid scripts may not work.
/usr/bin/df /dev/fd 2>&1 > /dev/null
case $? in
0) ;;
*)
	cat <<END >&4

NOTE: Your system does not have /dev/fd mounted.  If you want to
be able to use set-uid scripts you must ask your system administrator
to mount /dev/fd.

END
	;;
esac


# See if libucb can be found in /usr/lib.  If it is, warn the user
# that this may cause problems while building Perl extensions.
/usr/bin/ls /usr/lib/libucb* >/dev/null 2>&1
case $? in
0)
	cat <<END >&4

NOTE: libucb has been found in /usr/lib.  libucb should reside in
/usr/ucblib.  You may have trouble while building Perl extensions.

END
;;
esac

# Use shell built-in 'type' command instead of /usr/bin/which to
# avoid possible csh start-up problems and also to use the same shell
# we'll be using to Configure and make perl.
# The path name is the last field in the output, but the type command
# has an annoying array of possible outputs, e.g.:
#	make is hashed (/opt/gnu/bin/make)
# 	cc is /usr/ucb/cc
#	foo not found
# use a command like type make | awk '{print $NF}' | sed 's/[()]//g'

# See if make(1) is GNU make(1).
# If it is, make sure the setgid bit is not set.
make -v > make.vers 2>&1
if grep GNU make.vers > /dev/null 2>&1; then
    tmp=`type make | awk '{print $NF}' | sed 's/[()]//g'`
    case "`/usr/bin/ls -lL $tmp`" in
    ??????s*)
	    cat <<END >&2
	
NOTE: Your PATH points to GNU make, and your GNU make has the set-group-id
bit set.  You must either rearrange your PATH to put /usr/ccs/bin before the
GNU utilities or you must ask your system administrator to disable the
set-group-id bit on GNU make.

END
	    ;;
    esac
fi
rm -f make.vers

# XXX EXPERIMENTAL  A.D.  2/27/1998
# XXX This script UU/cc.cbu will get 'called-back' by Configure after it
# XXX has prompted the user for the C compiler to use.
cat > UU/cc.cbu <<'EOSH'
# If the C compiler is gcc:
#   - check the fixed-includes
#   - check as(1) and ld(1), they should not be GNU
#	(GNU as and ld 2.8.1 and later are reportedly ok, however.)
# If the C compiler is not gcc:
#   - check as(1) and ld(1), they should not be GNU
#	(GNU as and ld 2.8.1 and later are reportedly ok, however.)
#
# Watch out in case they have not set $cc.

# Perl compiled with some combinations of GNU as and ld may not 
# be able to perform dynamic loading of extensions.  If you have a
# problem with dynamic loading, be sure that you are using the Solaris
# /usr/ccs/bin/as and /usr/ccs/bin/ld.  You can do that with
#  		sh Configure -Dcc='gcc -B/usr/ccs/bin/'
# (note the trailing slash is required). 
# Combinations that are known to work with the following hints:
#
#  gcc-2.7.2, GNU as 2.7, GNU ld 2.7
#  egcs-1.0.3, GNU as 2.9.1 and GNU ld 2.9.1
#	--Andy Dougherty  <doughera@lafayette.edu>  
#	Tue Apr 13 17:19:43 EDT 1999

# Get gcc to share its secrets.
echo 'main() { return 0; }' > try.c
	# Indent to avoid propagation to config.sh
	verbose=`${cc:-cc} -v -o try try.c 2>&1`

if echo "$verbose" | grep '^Reading specs from' >/dev/null 2>&1; then
	#
	# Using gcc.
	#

	tmp=`echo "$verbose" | grep '^Reading' |
		awk '{print $NF}'  | sed 's/specs$/include/'`

	# Determine if the fixed-includes look like they'll work.
	# Doesn't work anymore for gcc-2.7.2.

	# See if as(1) is GNU as(1).  GNU as(1) might not work for this job.
	if echo "$verbose" | grep ' /usr/ccs/bin/as ' >/dev/null 2>&1; then
	    :
	else
	    cat <<END >&2

NOTE: You are using GNU as(1).  GNU as(1) might not build Perl.  If you
have trouble, you can use /usr/ccs/bin/as by including -B/usr/ccs/bin/
in your ${cc:-cc} command.  (Note that the trailing "/" is required.)

END
	    # Apparently not needed, at least for as 2.7 and later.
	    # cc="${cc:-cc} -B/usr/ccs/bin/"
	fi

	# See if ld(1) is GNU ld(1).  GNU ld(1) might not work for this job.
	# Recompute $verbose since we may have just changed $cc.
	verbose=`${cc:-cc} -v -o try try.c 2>&1 | grep ld 2>&1`

	if echo "$verbose" | grep ' /usr/ccs/bin/ld ' >/dev/null 2>&1; then
	    # Ok, gcc directly calls the Solaris /usr/ccs/bin/ld.
	    :
	elif echo "$verbose" | grep "ld: Software Generation Utilities" >/dev/null 2>&1; then
	    # Hmm.  gcc doesn't call /usr/ccs/bin/ld directly, but it
	    # does appear to be using it eventually.  egcs-1.0.3's ld
	    # wrapper does this.
	    # All Solaris versions of ld I've seen contain the magic
	    # string used in the grep.
	    :
	else
	    # No evidence yet of /usr/ccs/bin/ld.  Some versions
	    # of egcs's ld wrapper call /usr/ccs/bin/ld in turn but
	    # apparently don't reveal that unless you pass in -V.
	    # (This may all depend on local configurations too.)

	    myld=`echo $verbose| grep ld | awk '/\/ld/ {print $1}'`
	    # This assumes that gcc's output will not change, and that
	    # /full/path/to/ld will be the first word of the output.
	    # Thus myld is something like opt/gnu/sparc-sun-solaris2.5/bin/ld

	    if $myld -V 2>&1 | grep "ld: Software Generation Utilities" >/dev/null 2>&1; then
		# Ok, /usr/ccs/bin/ld eventually does get called.
		:
	    else
		cat <<END >&2

NOTE: You are using GNU ld(1).  GNU ld(1) might not build Perl.  If you
have trouble, you can use /usr/ccs/bin/ld by including -B/usr/ccs/bin/
in your ${cc:-cc} command.  (Note that the trailing "/" is required.)

I will try to use GNU ld by passing in the -Wl,-E flag, but if that
doesn't work, you should use -B/usr/ccs/bin/ instead.

END
		ccdlflags="$ccdlflags -Wl,-E"
		lddlflags="$lddlflags -W,l-E -G"
	    fi
	fi

else
	#
	# Not using gcc.
	#

	# See if as(1) is GNU as(1).  GNU might not work for this job.
	case `as --version < /dev/null 2>&1` in
	*GNU*)
		cat <<END >&2

NOTE: You are using GNU as(1).  GNU as(1) might not build Perl.
You must arrange to use /usr/ccs/bin/as, perhaps by adding /usr/ccs/bin
to the beginning of your PATH.

END
		;;
	esac

	# See if ld(1) is GNU ld(1).  GNU ld(1) might not work for this job.
	# ld --version doesn't properly report itself as a GNU tool,
	# as of ld version 2.6, so we need to be more strict. TWP 9/5/96
	gnu_ld=false
	case `ld --version < /dev/null 2>&1` in
	*GNU*|ld\ version\ 2*)
		gnu_ld=true ;;
	*) ;;
	esac
	if $gnu_ld ; then :
	else
		# Try to guess from path
		case `type ld | awk '{print $NF}'` in
		*gnu*|*GNU*|*FSF*)
			gnu_ld=true ;;
		esac
	fi
	if $gnu_ld ; then
		cat <<END >&2

NOTE: You are apparently using GNU ld(1).  GNU ld(1) might not build Perl.
You should arrange to use /usr/ccs/bin/ld, perhaps by adding /usr/ccs/bin
to the beginning of your PATH.

END
	fi

fi

# as --version or ld --version might dump core.
rm -f try try.c
rm -f core

# XXX
EOSH

cat > UU/usethreads.cbu <<'EOCBU'
# This script UU/usethreads.cbu will get 'called-back' by Configure 
# after it has prompted the user for whether to use threads.
case "$usethreads" in
$define|true|[yY]*)
        ccflags="-D_REENTRANT $ccflags"

        # sched_yield is in -lposix4
        set `echo X "$libswanted "| sed -e 's/ c / posix4 pthread c /'`
        shift
        libswanted="$*"

        # On Solaris 2.6 x86 there is a bug with sigsetjmp() and siglongjmp()
        # when linked with the threads library, such that whatever positive
        # value you pass to siglongjmp(), sigsetjmp() returns 1.
        # Thanks to Simon Parsons <S.Parsons@ftel.co.uk> for this report.
        # Sun BugID is 4117946, "sigsetjmp always returns 1 when called by
        # siglongjmp in a MT program". As of 19980622, there is no patch
        # available.
        cat >try.c <<'EOM'
	/* Test for sig(set|long)jmp bug. */
	#include <setjmp.h>
	 
	main()
	{
	    sigjmp_buf env;
	    int ret;
	
	    ret = sigsetjmp(env, 1);
	    if (ret) { return ret == 2; }
	    siglongjmp(env, 2);
	}
EOM
        if test "`arch`" = i86pc -a "$osvers" = 2.6 && \
           ${cc:-cc} try.c -lpthread >/dev/null 2>&1 && ./a.out; then
 	    d_sigsetjmp=$undef
	    cat << 'EOM' >&2

You will see a *** WHOA THERE!!! ***  message from Configure for
d_sigsetjmp.  Keep the recommended value.  See hints/solaris_2.sh
for more information.

EOM
        fi
	;;
esac
EOCBU

cat > UU/uselargefiles.cbu <<'EOCBU'
# This script UU/uselargefiles.cbu will get 'called-back' by Configure 
# after it has prompted the user for whether to use large files.
case "$uselargefiles" in
''|$define|true|[yY]*)
    ccflags="$ccflags `getconf LFS_CFLAGS 2>/dev/null`"
    ldflags="$ldflags `getconf LFS_LDFLAGS 2>/dev/null`"
    libswanted="$libswanted `getconf LFS_LIBS 2>/dev/null|sed -e 's@^-l@@' -e 's@ -l@ @g`"
    ;;
esac
EOCBU

cat > UU/use64bitint.cbu <<'EOCBU'
# This script UU/use64bitint.cbu will get 'called-back' by Configure 
# after it has prompted the user for whether to use 64 bit integers.
case "$use64bitint" in
"$define"|true|[yY]*)
	    case "`uname -r`" in
	    2.[1-6])
		cat >&4 <<EOM
Solaris `uname -r` does not support 64-bit integers.
You should upgrade to at least Solaris 2.7.
EOM
		exit 1
		;;
	    esac
	    ;;
esac
EOCBU

cat > UU/use64bitall.cbu <<'EOCBU'
# This script UU/use64bitall.cbu will get 'called-back' by Configure 
# after it has prompted the user for whether to be maximally 64 bitty.
case "$use64bitall-$use64bitall_done" in
"$define-"|true-|[yY]*-)
	    libc='/usr/lib/sparcv9/libc.so'
	    if test ! -f $libc; then
		cat >&4 <<EOM

I do not see the 64-bit libc, $libc.
Cannot continue, aborting.

EOM
		exit 1
	    fi 
	    loclibpth="$loclibpth /usr/lib/sparcv9"
	    case "$cc -v 2>/dev/null" in
	    *gcc*)
		echo 'main() { return 0; }' > try.c
		if ${cc:-cc} -mcpu=v9 -m64 -S try.c 2>&1 | grep -e \
		    '-m64 is not supported by this configuration'; then
		    cat >&4 <<EOM

Full 64-bit build not supported by this configuration.
Cannot continue, aborting.

EOM
		    exit 1
		fi
		ccflags="$ccflags -mcpu=v9 -m64"
		if test X`getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null` != X; then
		    ccflags="$ccflags -Wa,`getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null`"
		fi
		# no changes to ld flags, as (according to man ld):
		#
   		# There is no specific option that tells ld to link 64-bit
		# objects; the class of the first object that gets processed
		# by ld determines whether it is to perform a 32-bit or a
		# 64-bit link edit.
		;;
	    *)
		ccflags="$ccflags `getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null`"
		ldflags="$ldflags `getconf XBS5_LP64_OFF64_LDFLAGS 2>/dev/null`"
		lddlflags="$lddlflags -G `getconf XBS5_LP64_OFF64_LDFLAGS 2>/dev/null`"
		;;
	    esac	
	    libscheck='case "`/usr/bin/file $xxx`" in
*64-bit*|*SPARCV9*) ;;
*) xxx=/no/64-bit$xxx ;;
esac'
	    use64bitall_done=yes
	    ;;
esac
EOCBU
 
# Actually, we want to run this already now, if so requested,
# because we need to fix up things right now.
case "$use64bitall" in
"$define"|true|[yY]*)
	. ./UU/use64bitall.cbu
	;;
esac

cat > UU/uselongdouble.cbu <<'EOCBU'
# This script UU/uselongdouble.cbu will get 'called-back' by Configure 
# after it has prompted the user for whether to use long doubles.
case "$uselongdouble-$uselongdouble_done" in
"$define-"|true-|[yY]*-)
	case "$ccisworkshop" in
	'')
		cat <<EOM

I do not see the libsunmath.so; therefore I cannot do long doubles, sorry.

EOM
		exit 1
		;;
	esac
	libswanted="$libswanted sunmath"
	loclibpth="$loclibpth /opt/SUNWspro/lib"
	uselongdouble_done=yes
	;;
esac
EOCBU

# Actually, we want to run this already now, if so requested,
# because we need to fix up things right now.
case "$uselongdouble" in
"$define"|true|[yY]*)
	. ./UU/uselongdouble.cbu
	;;
esac

rm -f try.c try.o try
# keep that leading tab
	ccisworkshop=''
	ccisgcc=''

# This is just a trick to include some useful notes.
cat > /dev/null <<'End_of_Solaris_Notes'

Here are some notes kindly contributed by Dean Roehrich.

-----
Generic notes about building Perl5 on Solaris:
- Use /usr/ccs/bin/make.
- If you use GNU make, remove its setgid bit.
- Remove all instances of *ucb* from your path.
- Make sure libucb is not in /usr/lib (it should be in /usr/ucblib).
- Do not use GNU as or GNU ld, or any of GNU binutils or GNU libc.
- Do not use /usr/ucb/cc.
- Do not change Configure's default answers, except for the path names.
- Do not use -lmalloc.
- Do not build on SunOS 4 and expect it to work properly on SunOS 5.
- /dev/fd must be mounted if you want set-uid scripts to work.


Here are the gcc-related questions and answers from the Solaris 2 FAQ.  Note
the themes:
	- run fixincludes
	- run fixincludes correctly
	- don't use GNU as or GNU ld

Question 5.7 covers the __builtin_va_alist problem people are always seeing.
Question 6.1.3 covers the GNU as and GNU ld issues which are always biting
people.
Question 6.9 is for those who are still trying to compile Perl4.

The latest Solaris 2 FAQ can be found in the following locations:
	rtfm.mit.edu:/pub/usenet-by-group/comp.sys.sun.admin
	ftp.fwi.uva.nl:/pub/solaris

Perl5 comes with a script in the top-level directory called "myconfig" which
will print a summary of the configuration in your config.sh.  My summary for
Solaris 2.4 and gcc 2.6.3 follows.  I have also built with gcc 2.7.0 and the
results are identical.  This configuration was generated with Configure's -d
option (take all defaults, don't bother prompting me).  All tests pass for
Perl5.001, patch.1m.

Summary of my perl5 (patchlevel 1) configuration:
  Platform:
    osname=solaris, osver=2.4, archname=sun4-solaris
    uname='sunos poplar 5.4 generic_101945-27 sun4d sparc '
    hint=recommended
  Compiler:
    cc='gcc', optimize='-O', ld='gcc'
    cppflags=''
    ccflags =''
    ldflags =''
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    voidflags=15, castflags=0, d_casti32=define, d_castneg=define
    intsize=4, alignbytes=8, usemymalloc=y, randbits=15
  Libraries:
    so=so
    libpth=/lib /usr/lib /usr/ccs/lib /usr/local/lib
    libs=-lsocket -lnsl -ldl -lm -lc -lcrypt
    libc=/usr/lib/libc.so
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef
    cccdlflags='-fpic', ccdlflags=' ', lddlflags='-G'


Dean
roehrich@cray.com
9/7/95

-----------

From: Casper.Dik@Holland.Sun.COM (Casper H.S. Dik - Network Security Engineer)
Subject: Solaris 2 Frequently Asked Questions (FAQ) 1.48
Date: 25 Jul 1995 12:20:18 GMT

5.7) Why do I get __builtin_va_alist or __builtin_va_arg_incr undefined?

    You're using gcc without properly installing the gcc fixed
    include files.  Or you ran fixincludes after installing gcc
    w/o moving the gcc supplied varargs.h and stdarg.h files
    out of the way and moving them back again later.  This often
    happens when people install gcc from a binary distribution.
    If there's a tmp directory in gcc's include directory, fixincludes
    didn't complete.  You should have run "just-fixinc" instead.

    Another possible cause is using ``gcc -I/usr/include.''

6.1) Where is the C compiler or where can I get one?

    [...]

    3) Gcc.

    Gcc is available from the GNU archives in source and binary
    form.  Look in a directory called sparc-sun-solaris2 for
    binaries.  You need gcc 2.3.3 or later.  You should not use
    GNU as or GNU ld.  Make sure you run just-fixinc if you use
    a binary distribution.  Better is to get a binary version and
    use that to bootstrap gcc from source.

    [...]

    When you install gcc, don't make the mistake of installing
    GNU binutils or GNU libc, they are not as capable as their
    counterparts you get with Solaris 2.x.

6.9) I can't get perl 4.036 to compile or run.

    Run Configure, and use the solaris_2_0 hints, *don't* use
    the solaris_2_1 hints and don't use the config.sh you may
    already have.  First you must make sure Configure and make
    don't find /usr/ucb/cc.  (It must use gcc or the native C
    compiler: /opt/SUNWspro/bin/cc)

    Some questions need a special answer.

    Are your system (especially dbm) libraries compiled with gcc? [y] y

    yes: gcc 2.3.3 or later uses the standard calling
    conventions, same as Sun's C.

    Any additional cc flags? [ -traditional -Dvolatile=__volatile__
    -I/usr/ucbinclude] -traditional -Dvolatile=__volatile__
    Remove /usr/ucbinclude.

    Any additional libraries? [-lsocket -lnsl -ldbm -lmalloc -lm
    -lucb] -lsocket -lnsl  -lm

    Don't include -ldbm, -lmalloc and -lucb.

    Perl 5 compiled out of the box.

7.0) 64-bitness, from Alan Burlison (added by jhi 2000-02-21)

  You need a machine running Solaris 2.7 or above.

  Here's some rules:
  
  1. Solaris 2.7 and above will run in either 32 bit or 64 bit mode,
     via a reboot.
  2. You can build 64 bit apps whilst running 32 bit mode and vice-versa.
  3. 32 bit apps will run under Solaris running in either 32 or 64 bit mode.
  4. 64 bit apps require Solaris to be running 64 bit mode
  5. It is possible to select the appropriate 32 or 64 bit version of an
     app at run-time using isaexec(3).
  6. You can detect the OS mode using "isainfo -v", e.g.
      fubar$ isainfo -v   # Ultra 30 in 64 bit mode
      64-bit sparcv9 applications
      32-bit sparc applications
  7. To compile 64 bit you need to use the flag "-xarch=v9".
     getconf(1) will tell you this, e.g.
      fubar$ getconf -a | grep v9
      XBS5_LP64_OFF64_CFLAGS:         -xarch=v9
      XBS5_LP64_OFF64_LDFLAGS:        -xarch=v9
      XBS5_LP64_OFF64_LINTFLAGS:      -xarch=v9
      XBS5_LPBIG_OFFBIG_CFLAGS:       -xarch=v9
      XBS5_LPBIG_OFFBIG_LDFLAGS:      -xarch=v9
      XBS5_LPBIG_OFFBIG_LINTFLAGS:    -xarch=v9
      _XBS5_LP64_OFF64_CFLAGS:        -xarch=v9
      _XBS5_LP64_OFF64_LDFLAGS:       -xarch=v9
      _XBS5_LP64_OFF64_LINTFLAGS:     -xarch=v9
      _XBS5_LPBIG_OFFBIG_CFLAGS:      -xarch=v9
      _XBS5_LPBIG_OFFBIG_LDFLAGS:     -xarch=v9
      _XBS5_LPBIG_OFFBIG_LINTFLAGS:   -xarch=v9

  > > Now, what should we do, then?  Should -Duse64bits in a v9 box cause
  > > Perl to compiled in v9 mode?  Or should we for compatibility stick
  > > with 32 bit builds and let the people in the know to add the -xarch=v9
  > > to ccflags (and ldflags?)?

  > I think the second (explicit) mechanism should be the default.  Unless
  > you want to allocate more than ~ 4Gb of memory inside Perl, you don't
  > need Perl to be a 64-bit app.  Put it this way, on a machine running
  > Solaris 8, there are 463 executables under /usr/bin, but only 15 of
  > those require 64 bit versions - mainly because they invade the kernel
  > address space, e.g. adb, kgmon etc.  Certainly we don't recommend users
  > to build 64 bit apps unless they need the address space.

End_of_Solaris_Notes