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linux.sh
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1996-06-24
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# 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>
# 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
case "$prefix" in
'') prefix='/usr' ;;
esac
# gcc-2.6.3 defines _G_HAVE_BOOL to 1, but doesn't actually supply bool.
ccflags="-Dbool=char -DHAS_BOOL $ccflags"
# BSD compatability library no longer needed
set `echo X "$libswanted "| sed -e 's/ bsd / /'`
shift
libswanted="$*"
# Configure may fail to find lstat() since it's a static/inline
# function in <sys/stat.h>.
d_lstat=define
# Explanation?
case "$usemymalloc" in
'') usemymalloc='n' ;;
esac
case "$optimize" in
'') optimize='-O2' ;;
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 && ./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/bash -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
# Avoid some troublesome gcvt() functions. With some libc versions,
# perl -e '$x=1e5; print "$x\n";' prints 1e+5. We'd like it
# to print 100000 instead, consistent with the integer value given
# on other platforms. This isn't a bug in gcvt, really; more in our
# expectations for it. We'd like it to behave exactly as
# sprintf %.16g, but it isn't documented to do that.
#
# We'll use sprintf() instead, since we can control the output more
# precisely.
#
# The next version of Configure will check for this automatically.
d_Gconvert='sprintf((b),"%.*g",(n),(x))'