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[perl5.git] / hints / dec_osf.sh
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a0d0e21e 1# hints/dec_osf.sh
8e964347 2
b971f6e4 3# * If you want to debug perl or want to send a
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4# stack trace for inclusion into an bug report, call
5# Configure with the additional argument -Doptimize=-g2
6# or uncomment this assignment to "optimize":
7#
8#optimize=-g2
9#
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10# If you want both to optimise and debug with the DEC cc
11# you must have -g3, e.g. "-O4 -g3", and (re)run Configure.
12#
b971f6e4 13# * gcc can always have both -g and optimisation on.
8a019ce7 14#
b971f6e4 15# * debugging optimised code, no matter what compiler
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16# one is using, can be surprising and confusing because of
17# the optimisation tricks like code motion, code removal,
18# loop unrolling, and inlining. The source code and the
19# executable code simply do not agree any more while in
20# mid-execution, the optimiser only cares about the results.
21#
b971f6e4 22# * Configure will automatically add the often quoted
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23# -DDEBUGGING for you if the -g is specified.
24#
b971f6e4 25# * There is even more optimisation available in the new
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26# (GEM) DEC cc: -O5 and -fast. "man cc" will tell more about them.
27# The jury is still out whether either or neither help for Perl
28# and how much. Based on very quick testing, -fast boosts
29# raw data copy by about 5-15% (-fast brings in, among other
30# things, inlined, ahem, fast memcpy()), while on the other
31# hand searching things (index, m//, s///), seems to get slower.
32# Your mileage will vary.
8e964347 33#
b971f6e4 34# * The -std is needed because the following compiled
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35# without the -std and linked with -lm
36#
37# #include <math.h>
38# #include <stdio.h>
39# int main(){short x=10,y=sqrt(x);printf("%d\n",y);}
40#
41# will in Digital UNIX 3.* and 4.0b print 0 -- and in Digital
42# UNIX 4.0{,a} dump core: Floating point exception in the printf(),
43# the y has become a signaling NaN.
44#
b971f6e4 45# * Compilation warnings like:
46#
47# "Undefined the ANSI standard macro ..."
48#
49# can be ignored, at least while compiling the POSIX extension
50# and especially if using the sfio (the latter is not a standard
51# part of Perl, never mind if it says little to you).
52#
8e964347 53
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54# If using the DEC compiler we must find out the DEC compiler style:
55# the style changed between Digital UNIX (aka DEC OSF/1) 3 and
56# Digital UNIX 4. The old compiler was originally from Ultrix and
57# the MIPS company, the new compiler is originally from the VAX world
58# and it is called GEM. Many of the options we are going to use depend
59# on the compiler style.
60
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61cc=${cc:-cc}
62
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63case "`$cc -v 2>&1 | grep cc`" in
64*gcc*) isgcc=gcc ;;
65esac
66
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67# do NOT, I repeat, *NOT* take away the leading tabs
68# Configure Black Magic (TM)
b971f6e4 69 # reset
e60a08f8 70 _DEC_cc_style=
6c7aff00 71case "$isgcc" in
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72gcc) if [ "X$gccversion" = "X" ]; then
73 # Done too late in Configure if hinted
74 gccversion=`$cc --version | sed 's/.*(GCC) *//'`
75 fi
993a793c
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76 set $gccversion
77 if test "$1" -lt 2 -o \( "$1" -eq 2 -a \( "$2" -lt 95 -o \( "$2" -eq 95 -a "$3" -lt 3 \) \) \); then
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78 cat >&4 <<EOF
79
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80*** Your cc seems to be gcc and its version ($gccversion) seems to be
81*** less than 2.95.3. This is not a good idea since old versions of gcc
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82*** are known to produce buggy code when compiling Perl (and no doubt for
83*** other programs, too).
3f8b8817 84***
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85*** Therefore, I strongly suggest upgrading your gcc. (Why don't you use
86*** the vendor cc is also a good question. It comes with the operating
be73ebb0 87*** system, produces good code, and is very ANSI C fastidious.)
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88
89Cannot continue, aborting.
90
91EOF
92 exit 1
93 fi
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94 if test "$1" -eq 2 -a "$2" -eq 95 -a "$3" -le 2; then
95 cat >&4 <<EOF
96
97*** Note that as of gcc 2.95.2 (19991024) and Perl 5.6.0 (March 2000)
98*** if the said Perl is compiled with the said gcc the lib/sdbm test
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99*** may dump core (meaning that the SDBM_File extension is unusable).
100*** As this core dump never happens with the vendor cc, this is most
101*** probably a lingering bug in gcc. Therefore unless you have a better
102*** gcc installation you are still better off using the vendor cc.
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103
104Since you explicitly chose gcc, I assume that you know what are doing.
105
106EOF
107 fi
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108 # -ansi is fine for gcc in Tru64 (-ansi is not universally so).
109 _ccflags_strict_ansi="-ansi"
2cae8c0d 110 ;;
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111*) # compile something.
112 cat >try.c <<EOF
113int main() { return 0; }
114EOF
4de7e3a2 115 ccversion=`cc -V | awk '/(Compaq|DEC) C/ {print $3}' | grep '^V'`
e60a08f8 116 # the main point is the '-v' flag of 'cc'.
be73ebb0 117 case "`cc -v -c try.c 2>&1`" in
e60a08f8 118 */gemc_cc*) # we have the new DEC GEM CC
dfa3a3d3 119 _DEC_cc_style=new
8a019ce7 120 ;;
e60a08f8 121 *) # we have the old MIPS CC
dfa3a3d3 122 _DEC_cc_style=old
8a019ce7 123 ;;
e60a08f8 124 esac
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125 # We need to figure out whether -c99 is a valid flag to use.
126 # If it is, we can use it for being nauseatingly C99 ANSI --
127 # but even then the lddlflags needs to stay -std1.
128 # If it is not, we must use -std1 for both flags.
b6c28553 129 #
be73ebb0 130 case "`cc -c99 try.c 2>&1`" in
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131 *"-c99: Unknown flag"*)
132 _ccflags_strict_ansi="-std1"
133 ;;
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134 *) # However, use the -c99 only if compiling for
135 # -DPERL_MEM_LOG, where the C99 feature __func__
136 # is useful to have. Otherwise use the good old
137 # -std1 so that we stay C89 strict, which the goal
138 # of the Perl C code base (no //, no code between
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139 # declarations, etc). Moreover, the Tru64 cc is
140 # not fully C99, and most probably never will be.
141 #
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142 # The -DPERL_MEM_LOG can be either in ccflags
143 # (if using an old config.sh) or in the command line
144 # (which has been stowed away in UU/cmdline.opt).
b6c28553 145 #
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146 case "$ccflags `cat UU/cmdline.opt`" in
147 *-DPERL_MEM_LOG*) _ccflags_strict_ansi="-c99" ;;
148 *) _ccflags_strict_ansi="-std1" ;;
149 esac
150 ;;
151 esac
152 _lddlflags_strict_ansi="-std1"
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153 # -no_ansi_alias because Perl code is not that strict
154 # (also gcc uses by default -fno-strict-aliasing).
155 _ccflags_strict_ansi="$_ccflags_strict_ansi -no_ansi_alias"
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156 # Cleanup.
157 rm -f try.c try.o
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158 ;;
159esac
160
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161# Be nauseatingly ANSI
162ccflags="$ccflags $_ccflags_strict_ansi"
b971f6e4 163
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164# g++ needs -D_XOPEN_SOURCE -D_OSF_SOURCE to get much use of <unistd.h>.
165case "$cc" in
166*g++*) ccflags="$ccflags -D_XOPEN_SOURCE -D_OSF_SOURCE" ;;
167esac
168
b971f6e4 169# for gcc the Configure knows about the -fpic:
170# position-independent code for dynamic loading
171
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172# we want optimisation
173
174case "$optimize" in
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175'') case "$isgcc" in
176 gcc) optimize='-O3' ;;
e60a08f8 177 *) case "$_DEC_cc_style" in
6c7aff00 178 new) optimize='-O4' ;;
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179 old) optimize='-O2 -Olimit 3200' ;;
180 esac
b971f6e4 181 ccflags="$ccflags -D_INTRINSICS"
e60a08f8 182 ;;
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183 esac
184 ;;
1fc4cb55 185esac
28757baa 186
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187case "$isgcc" in
188gcc) ;;
189*) case "$optimize" in
190 *-O*) # With both -O and -g, the -g must be -g3.
191 optimize="`echo $optimize | sed 's/-g[1-4]*/-g3/'`"
192 ;;
193 esac
194 ;;
195esac
196
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197## Optimization limits
198case "$isgcc" in
199gcc) # gcc 3.2.1 wants a lot of memory for -O3'ing toke.c
200cat >try.c <<EOF
ebbde8c5 201#include <stdio.h>
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202#include <sys/resource.h>
203
204int main ()
205{
206 struct rlimit rl;
207 int i = getrlimit (RLIMIT_DATA, &rl);
208 printf ("%d\n", rl.rlim_cur / (1024 * 1024));
209 } /* main */
210EOF
211$cc -o try $ccflags $ldflags try.c
212 maxdsiz=`./try`
213rm -f try try.c core
214if [ $maxdsiz -lt 256 ]; then
215 # less than 256 MB is probably not enough to optimize toke.c with gcc -O3
216 cat <<EOM >&4
217
218Your process datasize is limited to $maxdsiz MB, which is (sadly) not
219always enough to fully optimize some source code files of Perl,
220at least 256 MB seems to be necessary as of Perl 5.8.0. I'll try to
221use a lower optimization level for those parts. You could either try
222using your shell's ulimit/limit/limits command to raise your datasize
223(assuming the system-wide hard resource limits allow you to go higher),
224or if you can't go higher and if you are a sysadmin, and you *do* want
225the full optimization, you can tune the 'max_per_proc_data_size'
226kernel parameter: see man sysconfigtab, and man sys_attrs_proc.
227
228EOM
229toke_cflags='optimize=-O2'
230 fi
231;;
232esac
233
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234# The patch 23787
235# http://public.activestate.com/cgi-bin/perlbrowse?patch=23787
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236# broke things for gcc (at least gcc 3.3) so that many of the pack()
237# checksum tests for formats L, j, J, especially when combined
238# with the < and > specifiers, started to fail if compiled with plain -O3.
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239case "$isgcc" in
240gcc)
0fae7d62 241pp_pack_cflags='optimize="-O3 -fno-cse-skip-blocks"'
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242;;
243esac
244
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245# we want dynamic fp rounding mode, and we want ieee exception semantics
246case "$isgcc" in
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247gcc) ;;
248*) case "$_DEC_cc_style" in
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249 new) ccflags="$ccflags -fprm d -ieee" ;;
250 esac
251 ;;
252esac
253
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254# Make glibpth agree with the compiler suite. Note that /shlib
255# is not here. That's on purpose. Even though that's where libc
256# really lives from V4.0 on, the linker (and /sbin/loader) won't
257# look there by default. The sharable /sbin utilities were all
258# built with "-Wl,-rpath,/shlib" to get around that. This makes
259# no attempt to figure out the additional location(s) searched by
260# gcc, since not all versions of gcc are easily coerced into
261# revealing that information.
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262glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
263glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
313489a2 264
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265# dlopen() is in libc
266libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
267
b971f6e4 268# libPW contains nothing useful for perl
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269libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
270
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271# libnet contains nothing useful for perl here, and doesn't work
272libswanted="`echo $libswanted | sed -e 's/ net / /'`"
273
b971f6e4 274# libbsd contains nothing used by perl that is not already in libc
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275libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
276
b971f6e4 277# libc need not be separately listed
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278libswanted="`echo $libswanted | sed -e 's/ c / /'`"
279
b971f6e4 280# ndbm is already in libc
281libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
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282
283# the basic lddlflags used always
284lddlflags='-shared -expect_unresolved "*"'
285
144df5e1 286# Intentional leading tab.
8cfab5ff 287 myosvers="`/usr/sbin/sizer -v 2>/dev/null || uname -r`"
144df5e1 288
b971f6e4 289# Fancy compiler suites use optimising linker as well as compiler.
290# <spider@Orb.Nashua.NH.US>
b8f0c030 291case "`uname -r`" in
b971f6e4 292*[123].*) # old loader
293 lddlflags="$lddlflags -O3"
294 ;;
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295*) if $test "X$optimize" = "X$undef"; then
296 lddlflags="$lddlflags -msym"
297 else
144df5e1 298 case "$myosvers" in
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299 *4.0D*)
300 # QAR 56761: -O4 + .so may produce broken code,
301 # fixed in 4.0E or better.
302 ;;
303 *)
304 lddlflags="$lddlflags $optimize"
305 ;;
306 esac
307 # -msym: If using a sufficiently recent /sbin/loader,
308 # keep the module symbols with the modules.
be73ebb0 309 lddlflags="$lddlflags -msym $_lddlflags_strict_ansi"
a07564da 310 fi
b971f6e4 311 ;;
312esac
313# Yes, the above loses if gcc does not use the system linker.
314# If that happens, let me know about it. <jhi@iki.fi>
315
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316# Because there is no other handy way to recognize 3.X.
317case "`uname -r`" in
318*3.*) ccflags="$ccflags -DDEC_OSF1_3_X" ;;
319esac
8a019ce7 320
b971f6e4 321# If debugging or (old systems and doing shared)
322# then do not strip the lib, otherwise, strip.
323# As noted above the -DDEBUGGING is added automagically by Configure if -g.
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324case "$optimize" in
325 *-g*) ;; # left intentionally blank
b8f0c030 326*) case "`uname -r`" in
b971f6e4 327 *[123].*)
328 case "$useshrplib" in
329 false|undef|'') lddlflags="$lddlflags -s" ;;
330 esac
331 ;;
8a019ce7 332 *) lddlflags="$lddlflags -s"
b971f6e4 333 ;;
334 esac
335 ;;
8a019ce7 336esac
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337
338#
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339# Make embedding in things like INN and Apache more memory friendly.
340# Keep it overridable on the Configure command line, though, so that
341# "-Uuseshrplib" prevents this default.
342#
343
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344case "$_DEC_cc_style.$useshrplib" in
345 new.) useshrplib="$define" ;;
346esac
313489a2 347
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348# The EFF_ONLY_OK from <sys/access.h> is present but dysfunctional for
349# [RWX]_OK as of Digital UNIX 4.0[A-D]?. If and when this gets fixed,
350# please adjust this appropriately. See also pp_sys.c just before the
351# emulate_eaccess().
5ff3f7a4 352
baa8820a 353# Fixed in V5.0A.
144df5e1 354case "$myosvers" in
f60a5d46 355*5.0[A-Z]*|*5.[1-9]*|*[6-9].[0-9]*)
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356 : ok
357 ;;
358*)
359# V5.0 or previous
5ff3f7a4 360pp_sys_cflags='ccflags="$ccflags -DNO_EFF_ONLY_OK"'
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361 ;;
362esac
5ff3f7a4 363
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364# The off_t is already 8 bytes, so we do have largefileness.
365
f60a5d46 366cat > UU/usethreads.cbu <<'EOCBU'
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367# This script UU/usethreads.cbu will get 'called-back' by Configure
368# after it has prompted the user for whether to use threads.
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369case "$usethreads" in
370$define|true|[yY]*)
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371 # In Tru64 V5 (at least V5.1A, V5.1B) gcc (at least 3.2.2)
372 # cannot be used to compile a threaded Perl.
373 cat > pthread.c <<EOF
374#include <pthread.h>
375extern int foo;
376EOF
377 $cc -c pthread.c 2> pthread.err
378 if grep -q "unrecognized compiler" pthread.err; then
379 cat >&4 <<EOF
380***
381*** I'm sorry but your C compiler ($cc) cannot be used to
382*** compile Perl with threads. The system C compiler should work.
383***
384
385Cannot continue, aborting.
386
387EOF
388 rm -f pthread.*
389 exit 1
390 fi
391 rm -f pthread.*
75d72f2c 392 # Threads interfaces changed with V4.0.
6c7aff00 393 case "$isgcc" in
700a71f5
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394 gcc)
395 ccflags="-D_REENTRANT $ccflags"
396 ;;
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397 *) case "`uname -r`" in
398 *[123].*) ccflags="-threads $ccflags" ;;
399 *) ccflags="-pthread $ccflags" ;;
400 esac
104d25b7 401 ;;
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402 esac
403 case "`uname -r`" in
404 *[123].*) libswanted="$libswanted pthreads mach exc c_r" ;;
405 *) libswanted="$libswanted pthread exc" ;;
406 esac
e883c329 407
baa8820a 408 case "$usemymalloc" in
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409 '')
410 usemymalloc='n'
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411 ;;
412 esac
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413 # These symbols are renamed in <time.h> so
414 # that the Configure hasproto doesn't see them.
415 d_asctime_r_proto="$define"
416 d_ctime_r_proto="$define"
417 d_gmtime_r_proto="$define"
418 d_localtime_r_proto="$define"
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419 ;;
420esac
421EOCBU
422
da0b61dd
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423# malloc wrap works
424case "$usemallocwrap" in
425'') usemallocwrap='define' ;;
426esac
427
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428cat > UU/uselongdouble.cbu <<'EOCBU'
429# This script UU/uselongdouble.cbu will get 'called-back' by Configure
430# after it has prompted the user for whether to use long doubles.
431case "$uselongdouble" in
bef5f079 432$define|true|[yY]*)
144df5e1 433 case "$myosvers" in
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434 *[1-4].0*) cat >&4 <<EOF
435
436***
437*** Sorry, you cannot use long doubles in pre-V5.0 releases of Tru64.
438***
439
440Cannot continue, aborting.
441
442EOF
443 exit 1
444 ;;
fa17d112 445 *)
be73ebb0 446 # Test whether libc's been fixed yet for long doubles.
fa17d112
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447 cat >try.c <<\TRY
448#include <stdio.h>
449int main(int argc, char **argv)
450{
451 unsigned long uvmax = ~0UL;
452 long double ld = uvmax + 0.0L;
453 char buf1[30], buf2[30];
454
455 (void) sprintf(buf1, "%lu", uvmax);
456 (void) sprintf(buf2, "%.0Lf", ld);
457 return strcmp(buf1, buf2) != 0;
458}
459TRY
460 # Don't bother trying to work with Configure's idea of
461 # cc and the various flags. This might not work as-is
462 # with gcc -- but we're testing libc, not the compiler.
be73ebb0 463 if cc -o try $_ccflags_strict_ansi try.c && ./try
fa17d112
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464 then
465 : ok
466 else
467 cat <<\UGLY >&4
468!
469Warning! Your libc has not yet been patched so that its "%Lf" format for
470printing long doubles shows all the significant digits. You will get errors
471in the t/op/numconvert test because of this. (The data is still good
472internally, and the "%e" format of printf() or sprintf() in perl will still
473produce valid results.) See README.tru64 for additional details.
474
475Continuing anyway.
476!
477UGLY
478 fi
479 $rm -f try try.c
bef5f079 480 esac
bef5f079 481 ;;
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482esac
483EOCBU
484
144df5e1 485case "$myosvers" in
bef5f079 486*[1-4].0*) d_modfl=undef ;; # must wait till 5.0
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487esac
488
cfc8a802 489# Keep that leading tab.
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490 old_LD_LIBRARY_PATH=$LD_LIBRARY_PATH
491for p in $loclibpth
492do
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493 if test -d $p; then
494 echo "Appending $p to LD_LIBRARY_PATH." >& 4
495 case "$LD_LIBRARY_PATH" in
496 '') LD_LIBRARY_PATH=$p ;;
497 *) LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$p ;;
498 esac
499 fi
500done
501case "$LD_LIBRARY_PATH" in
502"$old_LD_LIBRARY_PATH") ;;
503*) echo "LD_LIBRARY_PATH is now $LD_LIBRARY_PATH." >& 4 ;;
c93bd003 504esac
5460b889
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505case "$LD_LIBRARY_PATH" in
506'') ;;
507* ) export LD_LIBRARY_PATH ;;
508esac
c93bd003 509
313489a2 510#
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511# Unset temporary variables no more needed.
512#
513
514unset _DEC_cc_style
515
516#
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517# History:
518#
85ab1d1d
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519# perl5.005_51:
520#
521# September-1998 Jarkko Hietaniemi <jhi@iki.fi>
522#
523# * Added the -DNO_EFF_ONLY_OK flag ('use filetest;' support).
524#
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525# perl5.004_57:
526#
527# 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
528#
85ab1d1d 529# * Newer Digital UNIX compilers enforce signaling for NaN without
313489a2
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530# -ieee. Added -fprm d at the same time since it's friendlier for
531# embedding.
532#
533# * Fixed the library search path to match cc, ld, and /sbin/loader.
534#
535# * Default to building -Duseshrplib on newer systems. -Uuseshrplib
536# still overrides.
537#
538# * Fix -pthread additions for useshrplib. ld has no -pthread option.
539#
540#
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541# perl5.004_04:
542#
543# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
544#
545# * libnet on Digital UNIX is for JAVA, not for sockets.
546#
547#
b971f6e4 548# perl5.003_28:
549#
550# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
551#
552# * Restructuring Spider's suggestions.
553#
554# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
555#
556# * ld -s cannot be used in older Digital UNIXes when doing shared.
557#
558#
559# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
560#
561# * -hidden removed.
562#
563# * -DSTANDARD_C removed.
564#
565# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
566#
567# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
568#
569# * -msym for the newer runtime loaders.
570#
571# * $optimize also in $lddflags.
572#
573#
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574# perl5.003_27:
575#
576# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
577#
578# * unset _DEC_cc_style and more commentary on -std.
579#
580#
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581# perl5.003_26:
582#
583# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
584#
e60a08f8 585# * -std and -ansi.
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586#
587#
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588# perl5.003_24:
589#
590# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
591#
592# * Fixing the note on -DDEBUGGING.
593#
594# * Note on -O5 -fast.
595#
596#
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597# perl5.003_23:
598#
599# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
600#
601# * Notes on how to do both optimisation and debugging.
602#
603#
604# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
605#
606# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
607#
608# * Restructure the $lddlflags build.
609#
610# * $optimize based on which compiler we have.
611#
612#
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613# perl5.003_22:
614#
615# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
616#
617# * Added comments 'how to create a debugging version of perl'
618#
619# * Fixed logic of this script to prevent stripping of shared
620# objects by the loader (see ld man page for -s) is debugging
621# is set via the -g switch.
622#
623#
624# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
625#
626# * now 'dl' is always removed from libswanted. Not only if
627# optimize is an empty string.
628#
629#
630# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
631#
632# * Removed 'dl' from libswanted: When the FreePort binary
633# translator for Sun binaries is installed Configure concludes
634# that it should use libdl.x.yz.fpx.so :-(
635# Because the dlopen, dlclose,... calls are in the
636# C library it not necessary at all to check for the
637# dl library. Therefore dl is removed from libswanted.
638#
639#
640# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
641#
642# * Set -Olimit to 3200 because perl_yylex.c got too big
643# for the optimizer.
644#
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