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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>
#
# Last updated Tue May 30 14:25:02 EDT 1995
#
# If you wish to use something other than 'gcc' for your compiler,
# you should specify it on the Configure command line. To use
# gcc-elf, for exmample, type
# ./Configure -Dcc=gcc-elf
# 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
# Perl expects BSD style signal handling.
# gcc-2.6.3 defines _G_HAVE_BOOL to 1, but doesn't actually supply bool.
ccflags="-D__USE_BSD_SIGNAL -Dbool=char -DHAS_BOOL $ccflags"
# The following functions are gcc built-ins, but the Configure tests
# may fail because they don't supply proper prototypes.
# This should be fixed as of 5.001f. I'd appreciate reports.
d_memcmp=define
d_memcpy=define
# Configure may fail to find lstat() since it's a static/inline
# function in <sys/stat.h>.
d_lstat=define
# Explanation?
d_dosuid='define'
# I think Configure gets this right now, but I'd appreciate reports.
malloctype='void *'
# Explanation?
usemymalloc='n'
case "$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'
You appear to have ELF support. I'll try to use it for dynamic loading.
EOM
else
cat <<'EOM'
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=' '
so='sa'
dlext='o'
## If you are using DLD 3.2.4 which does not support shared libs,
## uncomment the next two lines:
#ldflags="-static"
#so='none'
fi
rm -f try.c a.out
if /bin/bash -c exit; then
echo You appear to have a working bash. Good.
else
cat << 'EOM'
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
# 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. Currently we disable NDBM for all linux systems.
# If someone can suggest a more robust test, that would be appreciated.
# This will generate a harmless message:
# Hmm...You had some extra variables I don't know about...I'll try to keep 'em.
# Propagating recommended variable d_dbm_open
d_dbm_open=undef
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