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[perl5.git] / hints / linux.sh
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1aef975c 1# hints/linux.sh
a0d0e21e 2# Original version by rsanders
1fc4cb55 3# Additional support by Kenneth Albanowski <kjahds@kjahds.com>
1aef975c 4#
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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>
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14
15# Updated Fri Jun 21 11:07:54 EDT 1996
16# NDBM support for ELF renabled by <kjahds@kjahds.com>
232e078e 17
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18# No version of Linux supports setuid scripts.
19d_suidsafe='undef'
f3db1d4d 20
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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.
40ignore_versioned_solibs='y'
41
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42# BSD compatibility library no longer needed
43# 'kaffe' has a /usr/lib/libnet.so which is not at all relevant for perl.
44# bind causes issues with several reentrant functions
45set `echo X "$libswanted "| sed -e 's/ bsd / /' -e 's/ net / /' -e 's/ bind / /'`
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46shift
47libswanted="$*"
1fc4cb55 48
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49# If you have glibc, then report the version for ./myconfig bug reporting.
50# (Configure doesn't need to know the specific version since it just uses
51# gcc to load the library for all tests.)
f443a56e 52# We don't use __GLIBC__ and __GLIBC_MINOR__ because they
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53# are insufficiently precise to distinguish things like
54# libc-2.0.6 and libc-2.0.7.
55if test -L /lib/libc.so.6; then
56 libc=`ls -l /lib/libc.so.6 | awk '{print $NF}'`
57 libc=/lib/$libc
58fi
59
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60# Configure may fail to find lstat() since it's a static/inline
61# function in <sys/stat.h>.
62d_lstat=define
1aef975c 63
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64# malloc wrap works
65case "$usemallocwrap" in
66'') usemallocwrap='define' ;;
67esac
68
f443a56e 69# The system malloc() is about as fast and as frugal as perl's.
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70# Since the system malloc() has been the default since at least
71# 5.001, we might as well leave it that way. --AD 10 Jan 2002
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72case "$usemymalloc" in
73'') usemymalloc='n' ;;
74esac
1aef975c 75
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76# Check if we're about to use Intel's ICC compiler
77case "`${cc:-cc} -V 2>&1`" in
87d05bbe 78*"Intel(R) C++ Compiler"*|*"Intel(R) C Compiler"*)
06d57135 79 # This is needed for Configure's prototype checks to work correctly
3d7ef91a 80 # The -mp1 flag is needed to pass cmp related tests
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81 # The -no-gcc flag is needed otherwise, icc pretends (poorly) to be gcc
82 ccflags="-we147 -mp1 -no-gcc $ccflags"
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83 # If we're using ICC, we usually want the best performance
84 case "$optimize" in
85 '') optimize='-O3' ;;
86 esac
87 ;;
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88*"Sun C"*)
89 optimize='-xO2'
90 cccdlflags='-KPIC'
91 lddlflags='-G -Bdynamic'
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92 # Sun C doesn't support gcc attributes, but, in many cases, doesn't
93 # complain either. Not all cases, though.
94 d_attribute_format='undef'
95 d_attribute_malloc='undef'
96 d_attribute_nonnull='undef'
97 d_attribute_noreturn='undef'
98 d_attribute_pure='undef'
99 d_attribute_unused='undef'
100 d_attribute_warn_unused_result='undef'
6452e86c 101 ;;
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102esac
103
1aef975c 104case "$optimize" in
051e4fe1 105# use -O2 by default ; -O3 doesn't seem to bring significant benefits with gcc
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106'')
107 optimize='-O2'
108 case "`uname -m`" in
109 ppc*)
110 # on ppc, it seems that gcc (at least gcc 3.3.2) isn't happy
f88ad257 111 # with -O2 ; so downgrade to -O1.
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112 optimize='-O1'
113 ;;
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114 ia64*)
115 # This architecture has had various problems with gcc's
116 # in the 3.2, 3.3, and 3.4 releases when optimized to -O2. See
117 # RT #37156 for a discussion of the problem.
118 case "`${cc:-gcc} -v 2>&1`" in
119 *"version 3.2"*|*"version 3.3"*|*"version 3.4"*)
120 ccflags="-fno-delete-null-pointer-checks $ccflags"
121 ;;
122 esac
123 ;;
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124 esac
125 ;;
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126esac
127
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128# Are we using ELF? Thanks to Kenneth Albanowski <kjahds@kjahds.com>
129# for this test.
130cat >try.c <<'EOM'
131/* Test for whether ELF binaries are produced */
132#include <fcntl.h>
133#include <stdlib.h>
134main() {
135 char buffer[4];
136 int i=open("a.out",O_RDONLY);
137 if(i==-1)
138 exit(1); /* fail */
139 if(read(i,&buffer[0],4)<4)
140 exit(1); /* fail */
141 if(buffer[0] != 127 || buffer[1] != 'E' ||
142 buffer[2] != 'L' || buffer[3] != 'F')
143 exit(1); /* fail */
144 exit(0); /* succeed (yes, it's ELF) */
145}
146EOM
5440bc8e 147if ${cc:-gcc} try.c >/dev/null 2>&1 && $run ./a.out; then
ef0c9946 148 cat <<'EOM' >&4
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149
150You appear to have ELF support. I'll try to use it for dynamic loading.
ef0c9946 151If dynamic loading doesn't work, read hints/linux.sh for further information.
232e078e 152EOM
ef0c9946 153
232e078e 154else
ef0c9946 155 cat <<'EOM' >&4
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156
157You don't have an ELF gcc. I will use dld if possible. If you are
158using a version of DLD earlier than 3.2.6, or don't have it at all, you
159should probably upgrade. If you are forced to use 3.2.4, you should
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160uncomment a couple of lines in hints/linux.sh and restart Configure so
161that shared libraries will be disallowed.
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162
163EOM
232e078e 164 lddlflags="-r $lddlflags"
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165 # These empty values are so that Configure doesn't put in the
166 # Linux ELF values.
167 ccdlflags=' '
168 cccdlflags=' '
c07a80fd 169 ccflags="-DOVR_DBL_DIG=14 $ccflags"
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170 so='sa'
171 dlext='o'
a5f75d66 172 nm_so_opt=' '
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173 ## If you are using DLD 3.2.4 which does not support shared libs,
174 ## uncomment the next two lines:
175 #ldflags="-static"
176 #so='none'
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177
178 # In addition, on some systems there is a problem with perl and NDBM
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179 # which causes AnyDBM and NDBM_File to lock up. This is evidenced
180 # in the tests as AnyDBM just freezing. Apparently, this only
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181 # happens on a.out systems, so we disable NDBM for all a.out linux
182 # systems. If someone can suggest a more robust test
183 # that would be appreciated.
184 #
185 # More info:
186 # Date: Wed, 7 Feb 1996 03:21:04 +0900
187 # From: Jeffrey Friedl <jfriedl@nff.ncl.omron.co.jp>
188 #
189 # I tried compiling with DBM support and sure enough things locked up
190 # just as advertised. Checking into it, I found that the lockup was
191 # during the call to dbm_open. Not *in* dbm_open -- but between the call
192 # to and the jump into.
f443a56e 193 #
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194 # To make a long story short, making sure that the *.a and *.sa pairs of
195 # /usr/lib/lib{m,db,gdbm}.{a,sa}
196 # were perfectly in sync took care of it.
197 #
198 # This will generate a harmless Whoa There! message
199 case "$d_dbm_open" in
200 '') cat <<'EOM' >&4
201
202Disabling ndbm. This will generate a Whoa There message in Configure.
203Read hints/linux.sh for further information.
204EOM
205 # You can override this with Configure -Dd_dbm_open
206 d_dbm_open=undef
207 ;;
208 esac
232e078e 209fi
a0d0e21e 210
c2960299 211rm -f try.c a.out
16d20bd9 212
e218ce4d 213if /bin/sh -c exit; then
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214 echo ''
215 echo 'You appear to have a working bash. Good.'
c2960299 216else
ef0c9946 217 cat << 'EOM' >&4
a0d0e21e 218
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219*********************** Warning! *********************
220It would appear you have a defective bash shell installed. This is likely to
221give you a failure of op/exec test #5 during the test phase of the build,
222Upgrading to a recent version (1.14.4 or later) should fix the problem.
223******************************************************
a0d0e21e 224EOM
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225
226fi
16d20bd9 227
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228# On SPARClinux,
229# The following csh consistently coredumped in the test directory
230# "/home/mikedlr/perl5.003_94/t", though not most other directories.
231
232#Name : csh Distribution: Red Hat Linux (Rembrandt)
233#Version : 5.2.6 Vendor: Red Hat Software
234#Release : 3 Build Date: Fri May 24 19:42:14 1996
235#Install date: Thu Jul 11 16:20:14 1996 Build Host: itchy.redhat.com
236#Group : Shells Source RPM: csh-5.2.6-3.src.rpm
237#Size : 184417
238#Description : BSD c-shell
239
240# For this reason I suggest using the much bug-fixed tcsh for globbing
241# where available.
242
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243# November 2001: That warning's pretty old now and probably not so
244# relevant, especially since perl now uses File::Glob for globbing.
245# We'll still look for tcsh, but tone down the warnings.
246# Andy Dougherty, Nov. 6, 2001
247if $csh -c 'echo $version' >/dev/null 2>&1; then
248 echo 'Your csh is really tcsh. Good.'
249else
99cae59c 250 if xxx=`./UU/loc tcsh blurfl $pth`; $test -f "$xxx"; then
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251 echo "Found tcsh. I'll use it for globbing."
252 # We can't change Configure's setting of $csh, due to the way
253 # Configure handles $d_portable and commands found in $loclist.
254 # We can set the value for CSH in config.h by setting full_csh.
255 full_csh=$xxx
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256 elif [ -f "$csh" ]; then
257 echo "Couldn't find tcsh. Csh-based globbing might be broken."
46fc3d4c 258 fi
284c50cc 259fi
dc66995c 260
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261# Shimpei Yamashita <shimpei@socrates.patnet.caltech.edu>
262# Message-Id: <33EF1634.B36B6500@pobox.com>
f443a56e 263#
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264# The DR2 of MkLinux (osname=linux,archname=ppc-linux) may need
265# special flags passed in order for dynamic loading to work.
92526645 266# instead of the recommended:
17ff8a05 267#
92526645 268# ccdlflags='-rdynamic'
f443a56e 269#
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270# it should be:
271# ccdlflags='-Wl,-E'
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272#
273# So if your DR2 (DR3 came out summer 1998, consider upgrading)
274# has problems with dynamic loading, uncomment the
275# following three lines, make distclean, and re-Configure:
276#case "`uname -r | sed 's/^[0-9.-]*//'``arch`" in
277#'osfmach3ppc') ccdlflags='-Wl,-E' ;;
278#esac
92526645 279
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280case "`uname -m`" in
281sparc*)
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282 case "$cccdlflags" in
283 *-fpic*) cccdlflags="`echo $cccdlflags|sed 's/-fpic/-fPIC/'`" ;;
4cd66402 284 *-fPIC*) ;;
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285 *) cccdlflags="$cccdlflags -fPIC" ;;
286 esac
287 ;;
288esac
289
f443a56e
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290# SuSE8.2 has /usr/lib/libndbm* which are ld scripts rather than
291# true libraries. The scripts cause binding against static
292# version of -lgdbm which is a bad idea. So if we have 'nm'
293# make sure it can read the file
294# NI-S 2003/08/07
295if [ -r /usr/lib/libndbm.so -a -x /usr/bin/nm ] ; then
296 if /usr/bin/nm /usr/lib/libndbm.so >/dev/null 2>&1 ; then
297 echo 'Your shared -lndbm seems to be a real library.'
298 else
299 echo 'Your shared -lndbm is not a real library.'
300 set `echo X "$libswanted "| sed -e 's/ ndbm / /'`
301 shift
302 libswanted="$*"
303 fi
304fi
305
306
307# This script UU/usethreads.cbu will get 'called-back' by Configure
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308# after it has prompted the user for whether to use threads.
309cat > UU/usethreads.cbu <<'EOCBU'
310case "$usethreads" in
311$define|true|[yY]*)
4d76a344 312 ccflags="-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS $ccflags"
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313 set `echo X "$libswanted "| sed -e 's/ c / pthread c /'`
314 shift
315 libswanted="$*"
47b8d1e2 316
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317 # Somehow at least in Debian 2.2 these manage to escape
318 # the #define forest of <features.h> and <time.h> so that
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319 # the hasproto macro of Configure doesn't see these protos,
320 # even with the -D_GNU_SOURCE.
47b8d1e2 321
a48ec845 322 d_asctime_r_proto="$define"
47b8d1e2 323 d_crypt_r_proto="$define"
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324 d_ctime_r_proto="$define"
325 d_gmtime_r_proto="$define"
326 d_localtime_r_proto="$define"
01b53dac 327 d_random_r_proto="$define"
47b8d1e2 328
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329 ;;
330esac
331EOCBU
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332
333cat > UU/uselargefiles.cbu <<'EOCBU'
f443a56e 334# This script UU/uselargefiles.cbu will get 'called-back' by Configure
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335# after it has prompted the user for whether to use large files.
336case "$uselargefiles" in
337''|$define|true|[yY]*)
9422c00b 338# Keep this in the left margin.
45c9e83b 339ccflags_uselargefiles="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
9422c00b 340
45c9e83b 341 ccflags="$ccflags $ccflags_uselargefiles"
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342 ;;
343esac
344EOCBU
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345
346# Purify fails to link Perl if a "-lc" is passed into its linker
347# due to duplicate symbols.
348case "$PURIFY" in
349$define|true|[yY]*)
350 set `echo X "$libswanted "| sed -e 's/ c / /'`
351 shift
352 libswanted="$*"
353 ;;
354esac