[perl5.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@lafayette.edu>
#
# Updated Thu Feb  8 11:56:10 EST 1996

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

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

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

# No version of Linux needs libutil for perl.
i_libutil='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.

# SuSE Linux can be used as cross-compilation host for Cray XT4 Catamount/Qk.
if test -d /opt/xt-pe
then
  case "`${cc:-cc} -V 2>&1`" in
  *catamount*) . hints/catamount.sh; return ;;
  esac
fi

# 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'

# BSD compatibility library no longer needed
# 'kaffe' has a /usr/lib/libnet.so which is not at all relevant for perl.
# bind causes issues with several reentrant functions
set `echo X "$libswanted "| sed -e 's/ bsd / /' -e 's/ net / /' -e 's/ bind / /'`
shift
libswanted="$*"

# Debian 4.0 puts ndbm in the -lgdbm_compat library.
libswanted="$libswanted gdbm_compat"

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

# malloc wrap works
case "$usemallocwrap" in
'') usemallocwrap='define' ;;
esac

# The system malloc() is about as fast and as frugal as perl's.
# Since the system malloc() has been the default since at least
# 5.001, we might as well leave it that way.  --AD  10 Jan 2002
case "$usemymalloc" in
'') usemymalloc='n' ;;
esac

uname_minus_m="`$run uname -m 2>/dev/null`"
uname_minus_m="${uname_minus_m:-"$targetarch"}"

# Check if we're about to use Intel's ICC compiler
case "`${cc:-cc} -V 2>&1`" in
*"Intel(R) C++ Compiler"*|*"Intel(R) C Compiler"*)
    # record the version, formats:
    # icc (ICC) 10.1 20080801
    # icpc (ICC) 10.1 20080801
    # followed by a copyright on the second line
    ccversion=`${cc:-cc} --version | sed -n -e 's/^icp\?c \((ICC) \)\?//p'`
    # This is needed for Configure's prototype checks to work correctly
    # The -mp flag is needed to pass various floating point related tests
    # The -no-gcc flag is needed otherwise, icc pretends (poorly) to be gcc
    ccflags="-we147 -mp -no-gcc $ccflags"
    # Prevent relocation errors on 64bits arch
    case "$uname_minus_m" in
	*ia64*|*x86_64*)
	    cccdlflags='-fPIC'
	;;
    esac
    # If we're using ICC, we usually want the best performance
    case "$optimize" in
    '') optimize='-O3' ;;
    esac
    ;;
*" Sun "*"C"*)
    # Sun's C compiler, which might have a 'tag' name between
    # 'Sun' and the 'C':  Examples:
    # cc: Sun C 5.9 Linux_i386 Patch 124871-01 2007/07/31
    # cc: Sun Ceres C 5.10 Linux_i386 2008/07/10
    test "$optimize" || optimize='-xO2'
    cccdlflags='-KPIC'
    lddlflags='-G -Bdynamic'
    # Sun C doesn't support gcc attributes, but, in many cases, doesn't
    # complain either.  Not all cases, though.
    d_attribute_format='undef'
    d_attribute_malloc='undef'
    d_attribute_nonnull='undef'
    d_attribute_noreturn='undef'
    d_attribute_pure='undef'
    d_attribute_unused='undef'
    d_attribute_warn_unused_result='undef'
    ;;
esac

case "$optimize" in
# use -O2 by default ; -O3 doesn't seem to bring significant benefits with gcc
'')
    optimize='-O2'
    case "$uname_minus_m" in
        ppc*)
            # on ppc, it seems that gcc (at least gcc 3.3.2) isn't happy
            # with -O2 ; so downgrade to -O1.
            optimize='-O1'
        ;;
        ia64*)
            # This architecture has had various problems with gcc's
            # in the 3.2, 3.3, and 3.4 releases when optimized to -O2.  See
            # RT #37156 for a discussion of the problem.
            case "`${cc:-gcc} -v 2>&1`" in
            *"version 3.2"*|*"version 3.3"*|*"version 3.4"*)
                ccflags="-fno-delete-null-pointer-checks $ccflags"
            ;;
            esac
        ;;
    esac
    ;;
esac

# Ubuntu 11.04 (and later, presumably) doesn't keep most libraries
# (such as -lm) in /lib or /usr/lib.  So we have to ask gcc to tell us
# where to look.  We don't want gcc's own libraries, however, so we
# filter those out.
# This could be conditional on Unbuntu, but other distributions may
# follow suit, and this scheme seems to work even on rather old gcc's.
# This unconditionally uses gcc because even if the user is using another
# compiler, we still need to find the math library and friends, and I don't
# know how other compilers will cope with that situation.
# Morever, if the user has their own gcc earlier in $PATH than the system gcc,
# we don't want its libraries. So we try to prefer the system gcc
# Still, as an escape hatch, allow Configure command line overrides to
# plibpth to bypass this check.
if [ -x /usr/bin/gcc ] ; then
    gcc=/usr/bin/gcc
else
    gcc=gcc
fi

case "$plibpth" in
'') plibpth=`LANG=C LC_ALL=C $gcc $ccflags $ldflags -print-search-dirs | grep libraries |
	cut -f2- -d= | tr ':' $trnl | grep -v 'gcc' | sed -e 's:/$::'`
    set X $plibpth # Collapse all entries on one line
    shift
    plibpth="$*"
    ;;
esac

case "$libc" in
'')
# 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.)
# 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.
    for p in $plibpth
    do
        for trylib in libc.so.6 libc.so
        do
            if $test -e $p/$trylib; then
                libc=`ls -l $p/$trylib | awk '{print $NF}'`
                if $test "X$libc" != X; then
                    break
                fi
            fi
        done
        if $test "X$libc" != X; then
            break
        fi
    done
    ;;
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>
#include <unistd.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} $ccflags $ldflags 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

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 ${sh:-/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 "$uname_minus_m" in
sparc*)
	case "$cccdlflags" in
	*-fpic*) cccdlflags="`echo $cccdlflags|sed 's/-fpic/-fPIC/'`" ;;
	*-fPIC*) ;;
	*)	 cccdlflags="$cccdlflags -fPIC" ;;
	esac
	;;
esac

# SuSE8.2 has /usr/lib/libndbm* which are ld scripts rather than
# true libraries. The scripts cause binding against static
# version of -lgdbm which is a bad idea. So if we have 'nm'
# make sure it can read the file
# NI-S 2003/08/07
case "$nm" in
    '') ;;
    *)
    for p in $plibpth
    do
        if $test -r $p/libndbm.so; then
            if $nm $p/libndbm.so >/dev/null 2>&1 ; then
                echo 'Your shared -lndbm seems to be a real library.'
                _libndbm_real=1
                break
            fi
        fi
    done
    if $test "X$_libndbm_real" = X; then
        echo 'Your shared -lndbm is not a real library.'
        set `echo X "$libswanted "| sed -e 's/ ndbm / /'`
        shift
        libswanted="$*"
    fi
    ;;
esac

# Linux on Synology.
if [ -f /etc/synoinfo.conf -a -d /usr/syno ]; then
    # Tested on Synology DS213 and DS413
    #  OS version info in /etc.defaults/VERSION
    #  http://forum.synology.com/wiki/index.php/What_kind_of_CPU_does_my_NAS_have
    # Synology DS213 running DSM 4.3-3810-0 (2013-11-06)
    #  CPU model Marvell Kirkwood mv6282 ARMv5te
    #  Linux 2.6.32.12 #3810 Wed Nov 6 05:13:41 CST 2013 armv5tel GNU/Linux
    # Synology DS413 running DSM 4.3-3810-0 (2013-11-06)
    #  CPU model Freescale QorIQ P1022 ppc (e500v2)
    #  linux 2.6.32.12 #3810 ppc GNU/Linux
    # All development stuff installed with ipkg is in /opt
    if [ "$LANG" = "" -o "$LANG" = "C" ]; then
	echo 'Your LANG is safe'
    else
	echo 'Please set $LANG to "C". All other $LANG settings will cause havoc' >&4
	LANG=C
    fi
    echo 'Setting up to use /opt/*' >&4
    locincpth="/opt/include $locincpth"
    libpth="/opt/lib $libpth"
    libspth="/opt/lib $libspth"
    loclibpth="/opt/lib $loclibpth"
    # POSIX will not link without the pthread lib
    libswanted="$libswanted pthread"
    echo "$libswanted" >&4
fi

# 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 -D_GNU_SOURCE $ccflags"
        if echo $libswanted | grep -v pthread >/dev/null
        then
            set `echo X "$libswanted "| sed -e 's/ c / pthread c /'`
            shift
            libswanted="$*"
        fi

	# Somehow at least in Debian 2.2 these manage to escape
	# the #define forest of <features.h> and <time.h> so that
	# the hasproto macro of Configure doesn't see these protos,
	# even with the -D_GNU_SOURCE.

	d_asctime_r_proto="$define"
	d_crypt_r_proto="$define"
	d_ctime_r_proto="$define"
	d_gmtime_r_proto="$define"
	d_localtime_r_proto="$define"
	d_random_r_proto="$define"

	;;
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

# Purify fails to link Perl if a "-lc" is passed into its linker
# due to duplicate symbols.
case "$PURIFY" in
$define|true|[yY]*)
    set `echo X "$libswanted "| sed -e 's/ c / /'`
    shift
    libswanted="$*"
    ;;
esac

# If using g++, the Configure scan for dlopen() and (especially)
# dlerror() might fail, easier just to forcibly hint them in.
case "$cc" in
*g++*)
  d_dlopen='define'
  d_dlerror='define'
  ;;
esac

# Under some circumstances libdb can get built in such a way as to
# need pthread explicitly linked.

libdb_needs_pthread="N"

if echo " $libswanted " | grep -v " pthread " >/dev/null
then
   if echo " $libswanted " | grep " db " >/dev/null
   then
     for DBDIR in $glibpth
     do
       DBLIB="$DBDIR/libdb.so"
       if [ -f $DBLIB ]
       then
         if ${nm:-nm} -u $DBLIB | grep pthread >/dev/null
         then
           if ldd $DBLIB | grep pthread >/dev/null
           then
             libdb_needs_pthread="N"
           else
             libdb_needs_pthread="Y"
           fi
         fi
       fi
     done
   fi
fi

case "$libdb_needs_pthread" in
  "Y")
    libswanted="$libswanted pthread"
    ;;
esac
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 AD	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	#
c3404dc3	9	# Consolidated by Andy Dougherty <doughera@lafayette.edu>
1fc4cb55	10	#
9bed9d38	11	# Updated Thu Feb 8 11:56:10 EST 1996
ef0c9946	12
c3404dc3	13	# Updated Thu May 30 10:50:22 EDT 1996 by <doughera@lafayette.edu>
ef0c9946	14
ef0c9946	15	# Updated Fri Jun 21 11:07:54 EDT 1996
dca46f05	16	# NDBM support for ELF re-enabled by <kjahds@kjahds.com>
232e078e	17
f3db1d4d CS	18	# No version of Linux supports setuid scripts.
f3db1d4d CS	19	d_suidsafe='undef'
f3db1d4d	20
5aa2cbff FR	21	# No version of Linux needs libutil for perl.
	22	i_libutil='undef'
	23
1cfa4ec7 GS	24	# Debian and Red Hat, and perhaps other vendors, provide both runtime and
	25	# development packages for some libraries. The runtime packages contain shared
	26	# libraries with version information in their names (e.g., libgdbm.so.1.7.3);
	27	# the development packages supplement this with versionless shared libraries
	28	# (e.g., libgdbm.so).
	29	#
	30	# If you want to link against such a library, you must install the development
	31	# version of the package.
	32	#
	33	# These packages use a -dev naming convention in both Debian and Red Hat:
	34	# libgdbmg1 (non-development version of GNU libc 2-linked GDBM library)
	35	# libgdbmg1-dev (development version of GNU libc 2-linked GDBM library)
	36	# So make sure that for any libraries you wish to link Perl with under
	37	# Debian or Red Hat you have the -dev packages installed.
9c12f1e5 RGS	38
	39	# SuSE Linux can be used as cross-compilation host for Cray XT4 Catamount/Qk.
	40	if test -d /opt/xt-pe
	41	then
400f22b8	42	case "`${cc:-cc} -V 2>&1`" in
9c12f1e5 RGS	43	catamount) . hints/catamount.sh; return ;;
	44	esac
	45	fi
	46
1cfa4ec7 GS	47	# Some operating systems (e.g., Solaris 2.6) will link to a versioned shared
	48	# library implicitly. For example, on Solaris, `ld foo.o -lgdbm' will find an
	49	# appropriate version of libgdbm, if one is available; Linux, however, doesn't
	50	# do the implicit mapping.
	51	ignore_versioned_solibs='y'
	52
2d1d6bf6 SP	53	# BSD compatibility library no longer needed
	54	# 'kaffe' has a /usr/lib/libnet.so which is not at all relevant for perl.
	55	# bind causes issues with several reentrant functions
	56	set `echo X "$libswanted "\| sed -e 's/ bsd / /' -e 's/ net / /' -e 's/ bind / /'`
4bf4dbb3	57	shift
4bf4dbb3	58	libswanted="$*"
1fc4cb55	59
a33f2d9f AD	60	# Debian 4.0 puts ndbm in the -lgdbm_compat library.
	61	libswanted="$libswanted gdbm_compat"
	62
232e078e AD	63	# Configure may fail to find lstat() since it's a static/inline
	64	# function in <sys/stat.h>.
	65	d_lstat=define
1aef975c	66
da0b61dd NC	67	# malloc wrap works
	68	case "$usemallocwrap" in
	69	'') usemallocwrap='define' ;;
	70	esac
	71
f443a56e	72	# The system malloc() is about as fast and as frugal as perl's.
c3404dc3 AD	73	# Since the system malloc() has been the default since at least
c3404dc3 AD	74	# 5.001, we might as well leave it that way. --AD 10 Jan 2002
c07a80fd	75	case "$usemymalloc" in
	76	'') usemymalloc='n' ;;
	77	esac
1aef975c	78
dd098899 BF	79	uname_minus_m="`$run uname -m 2>/dev/null`"
	80	uname_minus_m="${uname_minus_m:-"$targetarch"}"
	81
06d57135 MHM	82	# Check if we're about to use Intel's ICC compiler
06d57135 MHM	83	case "`${cc:-cc} -V 2>&1`" in
87d05bbe	84	"Intel(R) C++ Compiler"\|"Intel(R) C Compiler")
77b33db6 TC	85	# record the version, formats:
	86	# icc (ICC) 10.1 20080801
	87	# icpc (ICC) 10.1 20080801
	88	# followed by a copyright on the second line
	89	ccversion=`${cc:-cc} --version \| sed -n -e 's/^icp\?c \((ICC) \)\?//p'`
06d57135	90	# This is needed for Configure's prototype checks to work correctly
383f9357	91	# The -mp flag is needed to pass various floating point related tests
6ae709ad	92	# The -no-gcc flag is needed otherwise, icc pretends (poorly) to be gcc
383f9357	93	ccflags="-we147 -mp -no-gcc $ccflags"
95960e9d	94	# Prevent relocation errors on 64bits arch
dd098899	95	case "$uname_minus_m" in
95960e9d VP	96	ia64\|x86_64)
	97	cccdlflags='-fPIC'
	98	;;
	99	esac
06d57135 MHM	100	# If we're using ICC, we usually want the best performance
	101	case "$optimize" in
	102	'') optimize='-O3' ;;
	103	esac
	104	;;
7accc71d AD	105	" Sun ""C"*)
	106	# Sun's C compiler, which might have a 'tag' name between
	107	# 'Sun' and the 'C': Examples:
	108	# cc: Sun C 5.9 Linux_i386 Patch 124871-01 2007/07/31
	109	# cc: Sun Ceres C 5.10 Linux_i386 2008/07/10
395ff119	110	test "$optimize" \|\| optimize='-xO2'
6452e86c SP	111	cccdlflags='-KPIC'
6452e86c SP	112	lddlflags='-G -Bdynamic'
2f7602ba SP	113	# Sun C doesn't support gcc attributes, but, in many cases, doesn't
	114	# complain either. Not all cases, though.
	115	d_attribute_format='undef'
	116	d_attribute_malloc='undef'
	117	d_attribute_nonnull='undef'
	118	d_attribute_noreturn='undef'
	119	d_attribute_pure='undef'
	120	d_attribute_unused='undef'
	121	d_attribute_warn_unused_result='undef'
6452e86c	122	;;
06d57135 MHM	123	esac
06d57135 MHM	124
1aef975c	125	case "$optimize" in
051e4fe1	126	# use -O2 by default ; -O3 doesn't seem to bring significant benefits with gcc
be92ff21 RGS	127	'')
be92ff21 RGS	128	optimize='-O2'
dd098899	129	case "$uname_minus_m" in
be92ff21 RGS	130	ppc*)
be92ff21 RGS	131	# on ppc, it seems that gcc (at least gcc 3.3.2) isn't happy
f88ad257	132	# with -O2 ; so downgrade to -O1.
be92ff21 RGS	133	optimize='-O1'
be92ff21 RGS	134	;;
f88ad257 SP	135	ia64*)
	136	# This architecture has had various problems with gcc's
	137	# in the 3.2, 3.3, and 3.4 releases when optimized to -O2. See
	138	# RT #37156 for a discussion of the problem.
	139	case "`${cc:-gcc} -v 2>&1`" in
	140	"version 3.2"\|"version 3.3"\|"version 3.4")
	141	ccflags="-fno-delete-null-pointer-checks $ccflags"
	142	;;
	143	esac
	144	;;
be92ff21 RGS	145	esac
be92ff21 RGS	146	;;
1aef975c AD	147	esac
1aef975c AD	148
40f02623 AD	149	# Ubuntu 11.04 (and later, presumably) doesn't keep most libraries
	150	# (such as -lm) in /lib or /usr/lib. So we have to ask gcc to tell us
	151	# where to look. We don't want gcc's own libraries, however, so we
	152	# filter those out.
	153	# This could be conditional on Unbuntu, but other distributions may
	154	# follow suit, and this scheme seems to work even on rather old gcc's.
	155	# This unconditionally uses gcc because even if the user is using another
	156	# compiler, we still need to find the math library and friends, and I don't
	157	# know how other compilers will cope with that situation.
dcffd848 NC	158	# Morever, if the user has their own gcc earlier in $PATH than the system gcc,
dcffd848 NC	159	# we don't want its libraries. So we try to prefer the system gcc
40f02623 AD	160	# Still, as an escape hatch, allow Configure command line overrides to
40f02623 AD	161	# plibpth to bypass this check.
dcffd848 NC	162	if [ -x /usr/bin/gcc ] ; then
	163	gcc=/usr/bin/gcc
	164	else
	165	gcc=gcc
	166	fi
	167
40f02623	168	case "$plibpth" in
753809b0	169	'') plibpth=`LANG=C LC_ALL=C $gcc $ccflags $ldflags -print-search-dirs \| grep libraries \|
bcab1245 AD	170	cut -f2- -d= \| tr ':' $trnl \| grep -v 'gcc' \| sed -e 's:/$::'`
	171	set X $plibpth # Collapse all entries on one line
	172	shift
	173	plibpth="$*"
40f02623 AD	174	;;
	175	esac
	176
3b23fcb1 BF	177	case "$libc" in
	178	'')
	179	# If you have glibc, then report the version for ./myconfig bug reporting.
	180	# (Configure doesn't need to know the specific version since it just uses
	181	# gcc to load the library for all tests.)
	182	# We don't use __GLIBC__ and __GLIBC_MINOR__ because they
	183	# are insufficiently precise to distinguish things like
	184	# libc-2.0.6 and libc-2.0.7.
	185	for p in $plibpth
	186	do
	187	for trylib in libc.so.6 libc.so
	188	do
	189	if $test -e $p/$trylib; then
	190	libc=`ls -l $p/$trylib \| awk '{print $NF}'`
	191	if $test "X$libc" != X; then
	192	break
	193	fi
	194	fi
	195	done
	196	if $test "X$libc" != X; then
	197	break
	198	fi
	199	done
	200	;;
	201	esac
	202
232e078e AD	203	# Are we using ELF? Thanks to Kenneth Albanowski <kjahds@kjahds.com>
	204	# for this test.
	205	cat >try.c <<'EOM'
	206	/* Test for whether ELF binaries are produced */
	207	#include <fcntl.h>
	208	#include <stdlib.h>
b1e55cab	209	#include <unistd.h>
232e078e AD	210	main() {
	211	char buffer[4];
	212	int i=open("a.out",O_RDONLY);
	213	if(i==-1)
	214	exit(1); /* fail */
	215	if(read(i,&buffer[0],4)<4)
	216	exit(1); /* fail */
	217	if(buffer[0] != 127 \|\| buffer[1] != 'E' \|\|
	218	buffer[2] != 'L' \|\| buffer[3] != 'F')
	219	exit(1); /* fail */
	220	exit(0); /* succeed (yes, it's ELF) */
	221	}
	222	EOM
753809b0	223	if ${cc:-gcc} $ccflags $ldflags try.c >/dev/null 2>&1 && $run ./a.out; then
ef0c9946	224	cat <<'EOM' >&4
232e078e AD	225
232e078e AD	226	You appear to have ELF support. I'll try to use it for dynamic loading.
ef0c9946	227	If dynamic loading doesn't work, read hints/linux.sh for further information.
232e078e	228	EOM
ef0c9946	229
232e078e	230	else
ef0c9946	231	cat <<'EOM' >&4
16d20bd9 AD	232
	233	You don't have an ELF gcc. I will use dld if possible. If you are
	234	using a version of DLD earlier than 3.2.6, or don't have it at all, you
	235	should probably upgrade. If you are forced to use 3.2.4, you should
c2960299 AD	236	uncomment a couple of lines in hints/linux.sh and restart Configure so
c2960299 AD	237	that shared libraries will be disallowed.
16d20bd9 AD	238
16d20bd9 AD	239	EOM
232e078e	240	lddlflags="-r $lddlflags"
5d94fbed AD	241	# These empty values are so that Configure doesn't put in the
	242	# Linux ELF values.
	243	ccdlflags=' '
	244	cccdlflags=' '
c07a80fd	245	ccflags="-DOVR_DBL_DIG=14 $ccflags"
1aef975c AD	246	so='sa'
1aef975c AD	247	dlext='o'
a5f75d66	248	nm_so_opt=' '
1aef975c AD	249	## If you are using DLD 3.2.4 which does not support shared libs,
	250	## uncomment the next two lines:
	251	#ldflags="-static"
	252	#so='none'
ef0c9946	253
ef0c9946	254	# In addition, on some systems there is a problem with perl and NDBM
f443a56e JH	255	# which causes AnyDBM and NDBM_File to lock up. This is evidenced
f443a56e JH	256	# in the tests as AnyDBM just freezing. Apparently, this only
ef0c9946	257	# happens on a.out systems, so we disable NDBM for all a.out linux
	258	# systems. If someone can suggest a more robust test
	259	# that would be appreciated.
	260	#
	261	# More info:
	262	# Date: Wed, 7 Feb 1996 03:21:04 +0900
	263	# From: Jeffrey Friedl <jfriedl@nff.ncl.omron.co.jp>
	264	#
	265	# I tried compiling with DBM support and sure enough things locked up
	266	# just as advertised. Checking into it, I found that the lockup was
	267	# during the call to dbm_open. Not in dbm_open -- but between the call
	268	# to and the jump into.
f443a56e	269	#
ef0c9946	270	# To make a long story short, making sure that the .a and .sa pairs of
	271	# /usr/lib/lib{m,db,gdbm}.{a,sa}
	272	# were perfectly in sync took care of it.
	273	#
	274	# This will generate a harmless Whoa There! message
	275	case "$d_dbm_open" in
	276	'') cat <<'EOM' >&4
	277
	278	Disabling ndbm. This will generate a Whoa There message in Configure.
	279	Read hints/linux.sh for further information.
	280	EOM
	281	# You can override this with Configure -Dd_dbm_open
	282	d_dbm_open=undef
	283	;;
	284	esac
232e078e	285	fi
a0d0e21e	286
c2960299	287	rm -f try.c a.out
16d20bd9	288
400f22b8	289	if ${sh:-/bin/sh} -c exit; then
284c50cc MDLR	290	echo ''
284c50cc MDLR	291	echo 'You appear to have a working bash. Good.'
c2960299	292	else
ef0c9946	293	cat << 'EOM' >&4
a0d0e21e	294
ef0c9946	295	********************* Warning! *******************
	296	It would appear you have a defective bash shell installed. This is likely to
	297	give you a failure of op/exec test #5 during the test phase of the build,
	298	Upgrading to a recent version (1.14.4 or later) should fix the problem.
	299	******************************************************
a0d0e21e	300	EOM
c2960299 AD	301
c2960299 AD	302	fi
16d20bd9	303
284c50cc MDLR	304	# On SPARClinux,
	305	# The following csh consistently coredumped in the test directory
	306	# "/home/mikedlr/perl5.003_94/t", though not most other directories.
	307
	308	#Name : csh Distribution: Red Hat Linux (Rembrandt)
	309	#Version : 5.2.6 Vendor: Red Hat Software
	310	#Release : 3 Build Date: Fri May 24 19:42:14 1996
	311	#Install date: Thu Jul 11 16:20:14 1996 Build Host: itchy.redhat.com
	312	#Group : Shells Source RPM: csh-5.2.6-3.src.rpm
	313	#Size : 184417
	314	#Description : BSD c-shell
	315
	316	# For this reason I suggest using the much bug-fixed tcsh for globbing
	317	# where available.
	318
3d413b55 JH	319	# November 2001: That warning's pretty old now and probably not so
	320	# relevant, especially since perl now uses File::Glob for globbing.
	321	# We'll still look for tcsh, but tone down the warnings.
	322	# Andy Dougherty, Nov. 6, 2001
	323	if $csh -c 'echo $version' >/dev/null 2>&1; then
	324	echo 'Your csh is really tcsh. Good.'
	325	else
99cae59c	326	if xxx=`./UU/loc tcsh blurfl $pth`; $test -f "$xxx"; then
46fc3d4c	327	echo "Found tcsh. I'll use it for globbing."
	328	# We can't change Configure's setting of $csh, due to the way
	329	# Configure handles $d_portable and commands found in $loclist.
	330	# We can set the value for CSH in config.h by setting full_csh.
	331	full_csh=$xxx
3d413b55 JH	332	elif [ -f "$csh" ]; then
3d413b55 JH	333	echo "Couldn't find tcsh. Csh-based globbing might be broken."
46fc3d4c	334	fi
284c50cc	335	fi
dc66995c	336
92526645 CN	337	# Shimpei Yamashita <shimpei@socrates.patnet.caltech.edu>
92526645 CN	338	# Message-Id: <33EF1634.B36B6500@pobox.com>
f443a56e	339	#
17ff8a05 JH	340	# The DR2 of MkLinux (osname=linux,archname=ppc-linux) may need
17ff8a05 JH	341	# special flags passed in order for dynamic loading to work.
92526645	342	# instead of the recommended:
17ff8a05	343	#
92526645	344	# ccdlflags='-rdynamic'
f443a56e	345	#
92526645 CN	346	# it should be:
92526645 CN	347	# ccdlflags='-Wl,-E'
17ff8a05 JH	348	#
	349	# So if your DR2 (DR3 came out summer 1998, consider upgrading)
	350	# has problems with dynamic loading, uncomment the
	351	# following three lines, make distclean, and re-Configure:
	352	#case "`uname -r \| sed 's/^[0-9.-]*//'``arch`" in
	353	#'osfmach3ppc') ccdlflags='-Wl,-E' ;;
	354	#esac
92526645	355
dd098899	356	case "$uname_minus_m" in
f6527d0e	357	sparc*)
7cd1f58a BJ	358	case "$cccdlflags" in
7cd1f58a BJ	359	-fpic) cccdlflags="`echo $cccdlflags\|sed 's/-fpic/-fPIC/'`" ;;
4cd66402	360	-fPIC) ;;
7cd1f58a BJ	361	*) cccdlflags="$cccdlflags -fPIC" ;;
	362	esac
	363	;;
	364	esac
	365
f443a56e JH	366	# SuSE8.2 has /usr/lib/libndbm* which are ld scripts rather than
	367	# true libraries. The scripts cause binding against static
	368	# version of -lgdbm which is a bad idea. So if we have 'nm'
	369	# make sure it can read the file
	370	# NI-S 2003/08/07
70e1ff59 BF	371	case "$nm" in
	372	'') ;;
	373	*)
	374	for p in $plibpth
	375	do
	376	if $test -r $p/libndbm.so; then
	377	if $nm $p/libndbm.so >/dev/null 2>&1 ; then
	378	echo 'Your shared -lndbm seems to be a real library.'
	379	_libndbm_real=1
	380	break
	381	fi
	382	fi
	383	done
	384	if $test "X$_libndbm_real" = X; then
	385	echo 'Your shared -lndbm is not a real library.'
	386	set `echo X "$libswanted "\| sed -e 's/ ndbm / /'`
	387	shift
	388	libswanted="$*"
	389	fi
	390	;;
	391	esac
f443a56e	392
79a18634 MB	393	# Linux on Synology.
	394	if [ -f /etc/synoinfo.conf -a -d /usr/syno ]; then
	395	# Tested on Synology DS213 and DS413
	396	# OS version info in /etc.defaults/VERSION
	397	# http://forum.synology.com/wiki/index.php/What_kind_of_CPU_does_my_NAS_have
	398	# Synology DS213 running DSM 4.3-3810-0 (2013-11-06)
	399	# CPU model Marvell Kirkwood mv6282 ARMv5te
	400	# Linux 2.6.32.12 #3810 Wed Nov 6 05:13:41 CST 2013 armv5tel GNU/Linux
	401	# Synology DS413 running DSM 4.3-3810-0 (2013-11-06)
	402	# CPU model Freescale QorIQ P1022 ppc (e500v2)
	403	# linux 2.6.32.12 #3810 ppc GNU/Linux
	404	# All development stuff installed with ipkg is in /opt
	405	if [ "$LANG" = "" -o "$LANG" = "C" ]; then
	406	echo 'Your LANG is safe'
	407	else
	408	echo 'Please set $LANG to "C". All other $LANG settings will cause havoc' >&4
	409	LANG=C
	410	fi
	411	echo 'Setting up to use /opt/*' >&4
	412	locincpth="/opt/include $locincpth"
	413	libpth="/opt/lib $libpth"
	414	libspth="/opt/lib $libspth"
	415	loclibpth="/opt/lib $loclibpth"
	416	# POSIX will not link without the pthread lib
	417	libswanted="$libswanted pthread"
	418	echo "$libswanted" >&4
	419	fi
f443a56e JH	420
f443a56e JH	421	# This script UU/usethreads.cbu will get 'called-back' by Configure
104d25b7 JH	422	# after it has prompted the user for whether to use threads.
	423	cat > UU/usethreads.cbu <<'EOCBU'
	424	case "$usethreads" in
	425	$define\|true\|[yY]*)
d7c042c9	426	ccflags="-D_REENTRANT -D_GNU_SOURCE $ccflags"
5d3df70f JS	427	if echo $libswanted \| grep -v pthread >/dev/null
	428	then
	429	set `echo X "$libswanted "\| sed -e 's/ c / pthread c /'`
	430	shift
	431	libswanted="$*"
	432	fi
47b8d1e2	433
a48ec845 JH	434	# Somehow at least in Debian 2.2 these manage to escape
a48ec845 JH	435	# the #define forest of <features.h> and <time.h> so that
c95a4480 JH	436	# the hasproto macro of Configure doesn't see these protos,
c95a4480 JH	437	# even with the -D_GNU_SOURCE.
47b8d1e2	438
a48ec845	439	d_asctime_r_proto="$define"
47b8d1e2	440	d_crypt_r_proto="$define"
a48ec845 JH	441	d_ctime_r_proto="$define"
	442	d_gmtime_r_proto="$define"
	443	d_localtime_r_proto="$define"
01b53dac	444	d_random_r_proto="$define"
47b8d1e2	445
104d25b7 JH	446	;;
	447	esac
	448	EOCBU
7f2eea8e GS	449
7f2eea8e GS	450	cat > UU/uselargefiles.cbu <<'EOCBU'
f443a56e	451	# This script UU/uselargefiles.cbu will get 'called-back' by Configure
7f2eea8e GS	452	# after it has prompted the user for whether to use large files.
	453	case "$uselargefiles" in
	454	''\|$define\|true\|[yY]*)
9422c00b	455	# Keep this in the left margin.
45c9e83b	456	ccflags_uselargefiles="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
9422c00b	457
45c9e83b	458	ccflags="$ccflags $ccflags_uselargefiles"
7f2eea8e GS	459	;;
	460	esac
	461	EOCBU
3fe280b7 SP	462
	463	# Purify fails to link Perl if a "-lc" is passed into its linker
	464	# due to duplicate symbols.
	465	case "$PURIFY" in
	466	$define\|true\|[yY]*)
	467	set `echo X "$libswanted "\| sed -e 's/ c / /'`
	468	shift
	469	libswanted="$*"
	470	;;
	471	esac
b1e55cab	472
c3faea48 JH	473	# If using g++, the Configure scan for dlopen() and (especially)
	474	# dlerror() might fail, easier just to forcibly hint them in.
	475	case "$cc" in
	476	g++)
	477	d_dlopen='define'
	478	d_dlerror='define'
	479	;;
	480	esac
5d3df70f JS	481
	482	# Under some circumstances libdb can get built in such a way as to
	483	# need pthread explicitly linked.
	484
	485	libdb_needs_pthread="N"
	486
	487	if echo " $libswanted " \| grep -v " pthread " >/dev/null
	488	then
	489	if echo " $libswanted " \| grep " db " >/dev/null
	490	then
	491	for DBDIR in $glibpth
	492	do
	493	DBLIB="$DBDIR/libdb.so"
	494	if [ -f $DBLIB ]
	495	then
400f22b8	496	if ${nm:-nm} -u $DBLIB \| grep pthread >/dev/null
5d3df70f JS	497	then
	498	if ldd $DBLIB \| grep pthread >/dev/null
	499	then
	500	libdb_needs_pthread="N"
	501	else
	502	libdb_needs_pthread="Y"
	503	fi
	504	fi
	505	fi
	506	done
	507	fi
	508	fi
	509
	510	case "$libdb_needs_pthread" in
	511	"Y")
	512	libswanted="$libswanted pthread"
	513	;;
	514	esac