[p5sagit/p5-mst-13.2.git] / hints / linux.sh

# hints/linux.sh
# Original version by rsanders
# Additional support by Kenneth Albanowski <kjahds@kjahds.com>
#
# ELF support by H.J. Lu <hjl@nynexst.com>
# Additional info from Nigel Head <nhead@ESOC.bitnet>
# and Kenneth Albanowski <kjahds@kjahds.com>
#
# Consolidated by Andy Dougherty <doughera@lafcol.lafayette.edu>
#
# Updated Thu Feb  8 11:56:10 EST 1996

# Updated Thu May 30 10:50:22 EDT 1996 by <doughera@lafcol.lafayette.edu>

# Updated Fri Jun 21 11:07:54 EDT 1996
# NDBM support for ELF renabled by <kjahds@kjahds.com>

# No version of Linux supports setuid scripts.
d_suidsafe='undef'

# Debian and Red Hat, and perhaps other vendors, provide both runtime and
# development packages for some libraries.  The runtime packages contain shared
# libraries with version information in their names (e.g., libgdbm.so.1.7.3);
# the development packages supplement this with versionless shared libraries
# (e.g., libgdbm.so).
#
# If you want to link against such a library, you must install the development
# version of the package.
#
# These packages use a -dev naming convention in both Debian and Red Hat:
#   libgdbmg1  (non-development version of GNU libc 2-linked GDBM library)
#   libgdbmg1-dev (development version of GNU libc 2-linked GDBM library)
# So make sure that for any libraries you wish to link Perl with under
# Debian or Red Hat you have the -dev packages installed.
#
# Some operating systems (e.g., Solaris 2.6) will link to a versioned shared
# library implicitly.  For example, on Solaris, `ld foo.o -lgdbm' will find an
# appropriate version of libgdbm, if one is available; Linux, however, doesn't
# do the implicit mapping.
ignore_versioned_solibs='y'

# perl goes into the /usr tree.  See the Filesystem Standard
# available via anonymous FTP at tsx-11.mit.edu in
# /pub/linux/docs/linux-standards/fsstnd.
# Allow a command line override, e.g. Configure -Dprefix=/foo/bar
#
#  Addendum for 5.005_57 and beyond:
#
# However, most Linux users probably already have a /usr/bin/perl.
# We can't know whether the current user is intending to *replace*
# that /usr/bin/perl or whether the user is intending to install
# a *different* installation.
#
# Here is what we used to do:
# Allow a command line override, e.g. Configure -Dprefix=/foo/bar
# case "$prefix" in
# '') prefix='/usr' ;;
# esac
#
# For now, let's assume that most Linux users get their /usr/bin/perl
# from some packaging system, so that those compiling from source are
# probably the more experimental folks and hence probably aren't
# intending to replace /usr/bin/perl (at least just yet).
# This change makes linux consistent with most other unix platforms
# in having a default of prefix=/usr/local.
# These notes can probably safely be removed in 5.005_50 and beyond.
#
#	9 April 1999  Andy Dougherty  <doughera@lafayette.edu>
#

# BSD compatability library no longer needed
# 'kaffe' has a /usr/lib/libnet.so which is not at all relevent for perl.
set `echo X "$libswanted "| sed -e 's/ bsd / /' -e 's/ net / /'`
shift
libswanted="$*"

# If you have glibc, then report the version for ./myconfig bug reporting.
# (Configure doesn't need to know the specific version since it just uses
# gcc to load the library for all tests.)
# Is this sufficiently robust for libc5 systems as well as
# glibc-2.1.x systems?
# We don't use __GLIBC__ and  __GLIBC_MINOR__ because they 
# are insufficiently precise to distinguish things like
# libc-2.0.6 and libc-2.0.7.
if test -L /lib/libc.so.6; then
    libc=`ls -l /lib/libc.so.6 | awk '{print $NF}'`
    libc=/lib/$libc
fi

# Configure may fail to find lstat() since it's a static/inline
# function in <sys/stat.h>.
d_lstat=define

# Explanation?
case "$usemymalloc" in
'') usemymalloc='n' ;;
esac

case "$optimize" in
'') # If we have modern enough gcc and well-supported enough CPU,
    # crank up the optimization level.
    case "`${cc:-gcc} -v 2>&1`" in
    *"gcc version 2.95"*|*"gcc version 3."*)
        case "`arch 2>&1`" in
        i?86|ppc) optimize='-O3' ;;
        esac
        ;;
    esac
    case "$optimize" in
    '') optimize='-O2' ;;
    esac
    ;;
esac

# Are we using ELF?  Thanks to Kenneth Albanowski <kjahds@kjahds.com>
# for this test.
cat >try.c <<'EOM'
/* Test for whether ELF binaries are produced */
#include <fcntl.h>
#include <stdlib.h>
main() {
	char buffer[4];
	int i=open("a.out",O_RDONLY);
	if(i==-1)
		exit(1); /* fail */
	if(read(i,&buffer[0],4)<4)
		exit(1); /* fail */
	if(buffer[0] != 127 || buffer[1] != 'E' ||
           buffer[2] != 'L' || buffer[3] != 'F')
		exit(1); /* fail */
	exit(0); /* succeed (yes, it's ELF) */
}
EOM
if ${cc:-gcc} try.c >/dev/null 2>&1 && $run ./a.out; then
    cat <<'EOM' >&4

You appear to have ELF support.  I'll try to use it for dynamic loading.
If dynamic loading doesn't work, read hints/linux.sh for further information.
EOM

#For RedHat Linux 3.0.3, you may need to fetch
# ftp://ftp.redhat.com/pub/redhat-3.0.3/i386/updates/RPMS/ld.so-1.7.14-3.i386.rpm
#

else
    cat <<'EOM' >&4

You don't have an ELF gcc.  I will use dld if possible.  If you are
using a version of DLD earlier than 3.2.6, or don't have it at all, you
should probably upgrade. If you are forced to use 3.2.4, you should
uncomment a couple of lines in hints/linux.sh and restart Configure so
that shared libraries will be disallowed.

EOM
    lddlflags="-r $lddlflags"
    # These empty values are so that Configure doesn't put in the
    # Linux ELF values.
    ccdlflags=' '
    cccdlflags=' '
    ccflags="-DOVR_DBL_DIG=14 $ccflags"
    so='sa'
    dlext='o'
    nm_so_opt=' '
    ## If you are using DLD 3.2.4 which does not support shared libs,
    ## uncomment the next two lines:
    #ldflags="-static"
    #so='none'

	# In addition, on some systems there is a problem with perl and NDBM
	# which causes AnyDBM and NDBM_File to lock up. This is evidenced 
	# in the tests as AnyDBM just freezing.  Apparently, this only 
	# happens on a.out systems, so we disable NDBM for all a.out linux
	# systems.  If someone can suggest a more robust test
	#  that would be appreciated.
	#
	# More info:
	# Date: Wed, 7 Feb 1996 03:21:04 +0900
	# From: Jeffrey Friedl <jfriedl@nff.ncl.omron.co.jp>
	#
	# I tried compiling with DBM support and sure enough things locked up
	# just as advertised. Checking into it, I found that the lockup was
	# during the call to dbm_open. Not *in* dbm_open -- but between the call
	# to and the jump into.
	# 
	# To make a long story short, making sure that the *.a and *.sa pairs of
	#   /usr/lib/lib{m,db,gdbm}.{a,sa}
	# were perfectly in sync took care of it.
	#
	# This will generate a harmless Whoa There! message
	case "$d_dbm_open" in
	'')	cat <<'EOM' >&4

Disabling ndbm.  This will generate a Whoa There message in Configure.
Read hints/linux.sh for further information.
EOM
		# You can override this with Configure -Dd_dbm_open
		d_dbm_open=undef
		;;
	esac
fi

rm -f try.c a.out

if /bin/sh -c exit; then
  echo ''
  echo 'You appear to have a working bash.  Good.'
else
  cat << 'EOM' >&4

*********************** Warning! *********************
It would appear you have a defective bash shell installed. This is likely to
give you a failure of op/exec test #5 during the test phase of the build,
Upgrading to a recent version (1.14.4 or later) should fix the problem.
******************************************************
EOM

fi

# On SPARClinux,
# The following csh consistently coredumped in the test directory
# "/home/mikedlr/perl5.003_94/t", though not most other directories.

#Name        : csh                    Distribution: Red Hat Linux (Rembrandt)
#Version     : 5.2.6                        Vendor: Red Hat Software
#Release     : 3                        Build Date: Fri May 24 19:42:14 1996
#Install date: Thu Jul 11 16:20:14 1996 Build Host: itchy.redhat.com
#Group       : Shells                   Source RPM: csh-5.2.6-3.src.rpm
#Size        : 184417
#Description : BSD c-shell

# For this reason I suggest using the much bug-fixed tcsh for globbing
# where available.

# November 2001:  That warning's pretty old now and probably not so
# relevant, especially since perl now uses File::Glob for globbing.
# We'll still look for tcsh, but tone down the warnings.
# Andy Dougherty, Nov. 6, 2001
if $csh -c 'echo $version' >/dev/null 2>&1; then
    echo 'Your csh is really tcsh.  Good.'
else
    if xxx=`./UU/loc tcsh blurfl $pth`; $test -f "$xxx"; then
	echo "Found tcsh.  I'll use it for globbing."
	# We can't change Configure's setting of $csh, due to the way
	# Configure handles $d_portable and commands found in $loclist.
	# We can set the value for CSH in config.h by setting full_csh.
	full_csh=$xxx
    elif [ -f "$csh" ]; then
	echo "Couldn't find tcsh.  Csh-based globbing might be broken."
    fi
fi

# Shimpei Yamashita <shimpei@socrates.patnet.caltech.edu>
# Message-Id: <33EF1634.B36B6500@pobox.com>
# 
# The DR2 of MkLinux (osname=linux,archname=ppc-linux) may need
# special flags passed in order for dynamic loading to work.
# instead of the recommended:
#
# ccdlflags='-rdynamic'
# 
# it should be:
# ccdlflags='-Wl,-E'
#
# So if your DR2 (DR3 came out summer 1998, consider upgrading)
# has problems with dynamic loading, uncomment the
# following three lines, make distclean, and re-Configure:
#case "`uname -r | sed 's/^[0-9.-]*//'``arch`" in
#'osfmach3ppc') ccdlflags='-Wl,-E' ;;
#esac

case "`uname -r`" in
sparc-linux)
	case "$cccdlflags" in
	*-fpic*) cccdlflags="`echo $cccdlflags|sed 's/-fpic/-fPIC/'`" ;;
	*)	 cccdlflags="$cccdlflags -fPIC" ;;
	esac
	;;
esac

# This script UU/usethreads.cbu will get 'called-back' by Configure 
# after it has prompted the user for whether to use threads.
cat > UU/usethreads.cbu <<'EOCBU'
case "$usethreads" in
$define|true|[yY]*)
        ccflags="-D_REENTRANT $ccflags"
        set `echo X "$libswanted "| sed -e 's/ c / pthread c /'`
        shift
        libswanted="$*"
	;;
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]*)
# Keep this in the left margin.
ccflags_uselargefiles="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"

	ccflags="$ccflags $ccflags_uselargefiles"
	;;
esac
EOCBU
Commit	Line	Data
1aef975c	1	# hints/linux.sh
a0d0e21e	2	# Original version by rsanders
1fc4cb55	3	# Additional support by Kenneth Albanowski <kjahds@kjahds.com>
1aef975c	4	#
232e078e	5	# ELF support by H.J. Lu <hjl@nynexst.com>
	6	# Additional info from Nigel Head <nhead@ESOC.bitnet>
	7	# and Kenneth Albanowski <kjahds@kjahds.com>
1aef975c	8	#
232e078e	9	# Consolidated by Andy Dougherty <doughera@lafcol.lafayette.edu>
1fc4cb55	10	#
9bed9d38	11	# Updated Thu Feb 8 11:56:10 EST 1996
ef0c9946	12
	13	# Updated Thu May 30 10:50:22 EDT 1996 by <doughera@lafcol.lafayette.edu>
	14
	15	# Updated Fri Jun 21 11:07:54 EDT 1996
	16	# NDBM support for ELF renabled by <kjahds@kjahds.com>
232e078e	17
f3db1d4d	18	# No version of Linux supports setuid scripts.
f3db1d4d	19	d_suidsafe='undef'
f3db1d4d	20
1cfa4ec7	21	# Debian and Red Hat, and perhaps other vendors, provide both runtime and
	22	# development packages for some libraries. The runtime packages contain shared
	23	# libraries with version information in their names (e.g., libgdbm.so.1.7.3);
	24	# the development packages supplement this with versionless shared libraries
	25	# (e.g., libgdbm.so).
	26	#
	27	# If you want to link against such a library, you must install the development
	28	# version of the package.
	29	#
	30	# These packages use a -dev naming convention in both Debian and Red Hat:
	31	# libgdbmg1 (non-development version of GNU libc 2-linked GDBM library)
	32	# libgdbmg1-dev (development version of GNU libc 2-linked GDBM library)
	33	# So make sure that for any libraries you wish to link Perl with under
	34	# Debian or Red Hat you have the -dev packages installed.
	35	#
	36	# Some operating systems (e.g., Solaris 2.6) will link to a versioned shared
	37	# library implicitly. For example, on Solaris, `ld foo.o -lgdbm' will find an
	38	# appropriate version of libgdbm, if one is available; Linux, however, doesn't
	39	# do the implicit mapping.
	40	ignore_versioned_solibs='y'
	41
232e078e	42	# perl goes into the /usr tree. See the Filesystem Standard
	43	# available via anonymous FTP at tsx-11.mit.edu in
	44	# /pub/linux/docs/linux-standards/fsstnd.
16d20bd9	45	# Allow a command line override, e.g. Configure -Dprefix=/foo/bar
6d3b1ec5	46	#
	47	# Addendum for 5.005_57 and beyond:
	48	#
	49	# However, most Linux users probably already have a /usr/bin/perl.
	50	# We can't know whether the current user is intending to replace
	51	# that /usr/bin/perl or whether the user is intending to install
	52	# a different installation.
	53	#
	54	# Here is what we used to do:
	55	# Allow a command line override, e.g. Configure -Dprefix=/foo/bar
	56	# case "$prefix" in
	57	# '') prefix='/usr' ;;
	58	# esac
	59	#
	60	# For now, let's assume that most Linux users get their /usr/bin/perl
	61	# from some packaging system, so that those compiling from source are
	62	# probably the more experimental folks and hence probably aren't
	63	# intending to replace /usr/bin/perl (at least just yet).
	64	# This change makes linux consistent with most other unix platforms
	65	# in having a default of prefix=/usr/local.
85add8c2	66	# These notes can probably safely be removed in 5.005_50 and beyond.
6d3b1ec5	67	#
	68	# 9 April 1999 Andy Dougherty <doughera@lafayette.edu>
	69	#
1fc4cb55	70
4bf4dbb3	71	# BSD compatability library no longer needed
693762b4	72	# 'kaffe' has a /usr/lib/libnet.so which is not at all relevent for perl.
693762b4	73	set `echo X "$libswanted "\| sed -e 's/ bsd / /' -e 's/ net / /'`
4bf4dbb3	74	shift
4bf4dbb3	75	libswanted="$*"
1fc4cb55	76
a4ea3e34	77	# If you have glibc, then report the version for ./myconfig bug reporting.
	78	# (Configure doesn't need to know the specific version since it just uses
	79	# gcc to load the library for all tests.)
	80	# Is this sufficiently robust for libc5 systems as well as
	81	# glibc-2.1.x systems?
	82	# We don't use __GLIBC__ and __GLIBC_MINOR__ because they
	83	# are insufficiently precise to distinguish things like
	84	# libc-2.0.6 and libc-2.0.7.
	85	if test -L /lib/libc.so.6; then
	86	libc=`ls -l /lib/libc.so.6 \| awk '{print $NF}'`
	87	libc=/lib/$libc
	88	fi
	89
232e078e	90	# Configure may fail to find lstat() since it's a static/inline
	91	# function in <sys/stat.h>.
	92	d_lstat=define
1aef975c	93
16d20bd9	94	# Explanation?
c07a80fd	95	case "$usemymalloc" in
	96	'') usemymalloc='n' ;;
	97	esac
1aef975c	98
1aef975c	99	case "$optimize" in
eb782340	100	'') # If we have modern enough gcc and well-supported enough CPU,
	101	# crank up the optimization level.
	102	case "`${cc:-gcc} -v 2>&1`" in
bb010532	103	"gcc version 2.95"\|"gcc version 3.")
eb782340	104	case "`arch 2>&1`" in
	105	i?86\|ppc) optimize='-O3' ;;
	106	esac
	107	;;
	108	esac
	109	case "$optimize" in
	110	'') optimize='-O2' ;;
	111	esac
	112	;;
1aef975c	113	esac
1aef975c	114
232e078e	115	# Are we using ELF? Thanks to Kenneth Albanowski <kjahds@kjahds.com>
	116	# for this test.
	117	cat >try.c <<'EOM'
	118	/* Test for whether ELF binaries are produced */
	119	#include <fcntl.h>
	120	#include <stdlib.h>
	121	main() {
	122	char buffer[4];
	123	int i=open("a.out",O_RDONLY);
	124	if(i==-1)
	125	exit(1); /* fail */
	126	if(read(i,&buffer[0],4)<4)
	127	exit(1); /* fail */
	128	if(buffer[0] != 127 \|\| buffer[1] != 'E' \|\|
	129	buffer[2] != 'L' \|\| buffer[3] != 'F')
	130	exit(1); /* fail */
	131	exit(0); /* succeed (yes, it's ELF) */
	132	}
	133	EOM
5440bc8e	134	if ${cc:-gcc} try.c >/dev/null 2>&1 && $run ./a.out; then
ef0c9946	135	cat <<'EOM' >&4
232e078e	136
232e078e	137	You appear to have ELF support. I'll try to use it for dynamic loading.
ef0c9946	138	If dynamic loading doesn't work, read hints/linux.sh for further information.
232e078e	139	EOM
ef0c9946	140
	141	#For RedHat Linux 3.0.3, you may need to fetch
	142	# ftp://ftp.redhat.com/pub/redhat-3.0.3/i386/updates/RPMS/ld.so-1.7.14-3.i386.rpm
	143	#
	144
232e078e	145	else
ef0c9946	146	cat <<'EOM' >&4
16d20bd9	147
	148	You don't have an ELF gcc. I will use dld if possible. If you are
	149	using a version of DLD earlier than 3.2.6, or don't have it at all, you
	150	should probably upgrade. If you are forced to use 3.2.4, you should
c2960299	151	uncomment a couple of lines in hints/linux.sh and restart Configure so
c2960299	152	that shared libraries will be disallowed.
16d20bd9	153
16d20bd9	154	EOM
232e078e	155	lddlflags="-r $lddlflags"
5d94fbed	156	# These empty values are so that Configure doesn't put in the
	157	# Linux ELF values.
	158	ccdlflags=' '
	159	cccdlflags=' '
c07a80fd	160	ccflags="-DOVR_DBL_DIG=14 $ccflags"
1aef975c	161	so='sa'
1aef975c	162	dlext='o'
a5f75d66	163	nm_so_opt=' '
1aef975c	164	## If you are using DLD 3.2.4 which does not support shared libs,
	165	## uncomment the next two lines:
	166	#ldflags="-static"
	167	#so='none'
ef0c9946	168
	169	# In addition, on some systems there is a problem with perl and NDBM
	170	# which causes AnyDBM and NDBM_File to lock up. This is evidenced
	171	# in the tests as AnyDBM just freezing. Apparently, this only
	172	# happens on a.out systems, so we disable NDBM for all a.out linux
	173	# systems. If someone can suggest a more robust test
	174	# that would be appreciated.
	175	#
	176	# More info:
	177	# Date: Wed, 7 Feb 1996 03:21:04 +0900
	178	# From: Jeffrey Friedl <jfriedl@nff.ncl.omron.co.jp>
	179	#
	180	# I tried compiling with DBM support and sure enough things locked up
	181	# just as advertised. Checking into it, I found that the lockup was
	182	# during the call to dbm_open. Not in dbm_open -- but between the call
	183	# to and the jump into.
	184	#
	185	# To make a long story short, making sure that the .a and .sa pairs of
	186	# /usr/lib/lib{m,db,gdbm}.{a,sa}
	187	# were perfectly in sync took care of it.
	188	#
	189	# This will generate a harmless Whoa There! message
	190	case "$d_dbm_open" in
	191	'') cat <<'EOM' >&4
	192
	193	Disabling ndbm. This will generate a Whoa There message in Configure.
	194	Read hints/linux.sh for further information.
	195	EOM
	196	# You can override this with Configure -Dd_dbm_open
	197	d_dbm_open=undef
	198	;;
	199	esac
232e078e	200	fi
a0d0e21e	201
c2960299	202	rm -f try.c a.out
16d20bd9	203
e218ce4d	204	if /bin/sh -c exit; then
284c50cc	205	echo ''
284c50cc	206	echo 'You appear to have a working bash. Good.'
c2960299	207	else
ef0c9946	208	cat << 'EOM' >&4
a0d0e21e	209
ef0c9946	210	********************* Warning! *******************
	211	It would appear you have a defective bash shell installed. This is likely to
	212	give you a failure of op/exec test #5 during the test phase of the build,
	213	Upgrading to a recent version (1.14.4 or later) should fix the problem.
	214	******************************************************
a0d0e21e	215	EOM
c2960299	216
c2960299	217	fi
16d20bd9	218
284c50cc	219	# On SPARClinux,
	220	# The following csh consistently coredumped in the test directory
	221	# "/home/mikedlr/perl5.003_94/t", though not most other directories.
	222
	223	#Name : csh Distribution: Red Hat Linux (Rembrandt)
	224	#Version : 5.2.6 Vendor: Red Hat Software
	225	#Release : 3 Build Date: Fri May 24 19:42:14 1996
	226	#Install date: Thu Jul 11 16:20:14 1996 Build Host: itchy.redhat.com
	227	#Group : Shells Source RPM: csh-5.2.6-3.src.rpm
	228	#Size : 184417
	229	#Description : BSD c-shell
	230
	231	# For this reason I suggest using the much bug-fixed tcsh for globbing
	232	# where available.
	233
3d413b55	234	# November 2001: That warning's pretty old now and probably not so
	235	# relevant, especially since perl now uses File::Glob for globbing.
	236	# We'll still look for tcsh, but tone down the warnings.
	237	# Andy Dougherty, Nov. 6, 2001
	238	if $csh -c 'echo $version' >/dev/null 2>&1; then
	239	echo 'Your csh is really tcsh. Good.'
	240	else
99cae59c	241	if xxx=`./UU/loc tcsh blurfl $pth`; $test -f "$xxx"; then
46fc3d4c	242	echo "Found tcsh. I'll use it for globbing."
	243	# We can't change Configure's setting of $csh, due to the way
	244	# Configure handles $d_portable and commands found in $loclist.
	245	# We can set the value for CSH in config.h by setting full_csh.
	246	full_csh=$xxx
3d413b55	247	elif [ -f "$csh" ]; then
3d413b55	248	echo "Couldn't find tcsh. Csh-based globbing might be broken."
46fc3d4c	249	fi
284c50cc	250	fi
dc66995c	251
92526645	252	# Shimpei Yamashita <shimpei@socrates.patnet.caltech.edu>
	253	# Message-Id: <33EF1634.B36B6500@pobox.com>
	254	#
17ff8a05	255	# The DR2 of MkLinux (osname=linux,archname=ppc-linux) may need
17ff8a05	256	# special flags passed in order for dynamic loading to work.
92526645	257	# instead of the recommended:
17ff8a05	258	#
92526645	259	# ccdlflags='-rdynamic'
	260	#
	261	# it should be:
	262	# ccdlflags='-Wl,-E'
17ff8a05	263	#
	264	# So if your DR2 (DR3 came out summer 1998, consider upgrading)
	265	# has problems with dynamic loading, uncomment the
	266	# following three lines, make distclean, and re-Configure:
	267	#case "`uname -r \| sed 's/^[0-9.-]*//'``arch`" in
	268	#'osfmach3ppc') ccdlflags='-Wl,-E' ;;
	269	#esac
92526645	270
7cd1f58a	271	case "`uname -r`" in
	272	sparc-linux)
	273	case "$cccdlflags" in
	274	-fpic) cccdlflags="`echo $cccdlflags\|sed 's/-fpic/-fPIC/'`" ;;
	275	*) cccdlflags="$cccdlflags -fPIC" ;;
	276	esac
	277	;;
	278	esac
	279
104d25b7	280	# This script UU/usethreads.cbu will get 'called-back' by Configure
	281	# after it has prompted the user for whether to use threads.
	282	cat > UU/usethreads.cbu <<'EOCBU'
	283	case "$usethreads" in
	284	$define\|true\|[yY]*)
	285	ccflags="-D_REENTRANT $ccflags"
	286	set `echo X "$libswanted "\| sed -e 's/ c / pthread c /'`
	287	shift
	288	libswanted="$*"
	289	;;
	290	esac
	291	EOCBU
7f2eea8e	292
	293	cat > UU/uselargefiles.cbu <<'EOCBU'
	294	# This script UU/uselargefiles.cbu will get 'called-back' by Configure
	295	# after it has prompted the user for whether to use large files.
	296	case "$uselargefiles" in
	297	''\|$define\|true\|[yY]*)
9422c00b	298	# Keep this in the left margin.
45c9e83b	299	ccflags_uselargefiles="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
9422c00b	300
45c9e83b	301	ccflags="$ccflags $ccflags_uselargefiles"
7f2eea8e	302	;;
	303	esac
	304	EOCBU