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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#
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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=${cc:-cc}
62
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63# do NOT, I repeat, *NOT* take away the leading tabs
64# Configure Black Magic (TM)
b971f6e4 65 # reset
e60a08f8 66 _DEC_cc_style=
8d5a0f9f 67case "`$cc -v 2>&1 | grep cc`" in
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68*gcc*) ;; # pass
69*) # compile something small: taint.c is fine for this.
70 # the main point is the '-v' flag of 'cc'.
71 case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in
72 */gemc_cc*) # we have the new DEC GEM CC
dfa3a3d3 73 _DEC_cc_style=new
8a019ce7 74 ;;
e60a08f8 75 *) # we have the old MIPS CC
dfa3a3d3 76 _DEC_cc_style=old
8a019ce7 77 ;;
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78 esac
79 # cleanup
80 rm -f /tmp/taint$$.o
81 ;;
82esac
83
b971f6e4 84# be nauseatingly ANSI
8d5a0f9f 85case "`$cc -v 2>&1 | grep gcc`" in
9607fc9c 86*gcc*) ccflags="$ccflags -ansi"
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87 ;;
88*) ccflags="$ccflags -std"
89 ;;
90esac
91
92# for gcc the Configure knows about the -fpic:
93# position-independent code for dynamic loading
94
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95# we want optimisation
96
97case "$optimize" in
8d5a0f9f 98'') case "`$cc -v 2>&1 | grep gcc`" in
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99 *gcc*)
100 optimize='-O3' ;;
101 *) case "$_DEC_cc_style" in
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102 new) optimize='-O4'
103 ccflags="$ccflags -fprm d -ieee"
104 ;;
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105 old) optimize='-O2 -Olimit 3200' ;;
106 esac
b971f6e4 107 ccflags="$ccflags -D_INTRINSICS"
e60a08f8 108 ;;
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109 esac
110 ;;
1fc4cb55 111esac
28757baa 112
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113# Make glibpth agree with the compiler suite. Note that /shlib
114# is not here. That's on purpose. Even though that's where libc
115# really lives from V4.0 on, the linker (and /sbin/loader) won't
116# look there by default. The sharable /sbin utilities were all
117# built with "-Wl,-rpath,/shlib" to get around that. This makes
118# no attempt to figure out the additional location(s) searched by
119# gcc, since not all versions of gcc are easily coerced into
120# revealing that information.
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121glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
122glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
313489a2 123
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124# dlopen() is in libc
125libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
126
b971f6e4 127# libPW contains nothing useful for perl
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128libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
129
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130# libnet contains nothing useful for perl here, and doesn't work
131libswanted="`echo $libswanted | sed -e 's/ net / /'`"
132
b971f6e4 133# libbsd contains nothing used by perl that is not already in libc
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134libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
135
b971f6e4 136# libc need not be separately listed
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137libswanted="`echo $libswanted | sed -e 's/ c / /'`"
138
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139# ndbm is already in libc
140libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
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141
142# the basic lddlflags used always
143lddlflags='-shared -expect_unresolved "*"'
144
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145# Fancy compiler suites use optimising linker as well as compiler.
146# <spider@Orb.Nashua.NH.US>
b8f0c030 147case "`uname -r`" in
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148*[123].*) # old loader
149 lddlflags="$lddlflags -O3"
150 ;;
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151*) if $test "X$optimize" = "X$undef"; then
152 lddlflags="$lddlflags -msym"
153 else
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154 case "`sizer -v`" in
155 *4.0D*)
156 # QAR 56761: -O4 + .so may produce broken code,
157 # fixed in 4.0E or better.
158 ;;
159 *)
160 lddlflags="$lddlflags $optimize"
161 ;;
162 esac
163 # -msym: If using a sufficiently recent /sbin/loader,
164 # keep the module symbols with the modules.
165 lddlflags="$lddlflags -msym"
a07564da 166 fi
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167 ;;
168esac
169# Yes, the above loses if gcc does not use the system linker.
170# If that happens, let me know about it. <jhi@iki.fi>
171
8a019ce7 172
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173# If debugging or (old systems and doing shared)
174# then do not strip the lib, otherwise, strip.
175# As noted above the -DDEBUGGING is added automagically by Configure if -g.
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176case "$optimize" in
177 *-g*) ;; # left intentionally blank
b8f0c030 178*) case "`uname -r`" in
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179 *[123].*)
180 case "$useshrplib" in
181 false|undef|'') lddlflags="$lddlflags -s" ;;
182 esac
183 ;;
8a019ce7 184 *) lddlflags="$lddlflags -s"
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185 ;;
186 esac
187 ;;
8a019ce7 188esac
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189
190#
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191# Make embedding in things like INN and Apache more memory friendly.
192# Keep it overridable on the Configure command line, though, so that
193# "-Uuseshrplib" prevents this default.
194#
195
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196case "$_DEC_cc_style.$useshrplib" in
197 new.) useshrplib="$define" ;;
198esac
313489a2 199
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200# The EFF_ONLY_OK from <sys/access.h> is present but dysfunctional for
201# [RWX]_OK as of Digital UNIX 4.0[A-D]?. If and when this gets fixed,
202# please adjust this appropriately. See also pp_sys.c just before the
203# emulate_eaccess().
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204
205pp_sys_cflags='ccflags="$ccflags -DNO_EFF_ONLY_OK"'
206
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207# The off_t is already 8 bytes, so we do have largefileness.
208
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209# This script UU/usethreads.cbu will get 'called-back' by Configure
210# after it has prompted the user for whether to use threads.
211cat > UU/usethreads.cbu <<'EOCBU'
212case "$usethreads" in
213$define|true|[yY]*)
75d72f2c 214 # Threads interfaces changed with V4.0.
8d5a0f9f 215 case "`$cc -v 2>&1 | grep gcc`" in
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216 *gcc*)ccflags="-D_REENTRANT $ccflags" ;;
217 *) case "`uname -r`" in
218 *[123].*) ccflags="-threads $ccflags" ;;
219 *) ccflags="-pthread $ccflags" ;;
220 esac
104d25b7 221 ;;
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222 esac
223 case "`uname -r`" in
224 *[123].*) libswanted="$libswanted pthreads mach exc c_r" ;;
225 *) libswanted="$libswanted pthread exc" ;;
226 esac
e883c329 227
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228 usemymalloc='n'
229 ;;
230esac
231EOCBU
232
313489a2 233#
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234# Unset temporary variables no more needed.
235#
236
237unset _DEC_cc_style
238
239#
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240# History:
241#
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242# perl5.005_51:
243#
244# September-1998 Jarkko Hietaniemi <jhi@iki.fi>
245#
246# * Added the -DNO_EFF_ONLY_OK flag ('use filetest;' support).
247#
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248# perl5.004_57:
249#
250# 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
251#
85ab1d1d 252# * Newer Digital UNIX compilers enforce signaling for NaN without
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253# -ieee. Added -fprm d at the same time since it's friendlier for
254# embedding.
255#
256# * Fixed the library search path to match cc, ld, and /sbin/loader.
257#
258# * Default to building -Duseshrplib on newer systems. -Uuseshrplib
259# still overrides.
260#
261# * Fix -pthread additions for useshrplib. ld has no -pthread option.
262#
263#
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264# perl5.004_04:
265#
266# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
267#
268# * libnet on Digital UNIX is for JAVA, not for sockets.
269#
270#
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271# perl5.003_28:
272#
273# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
274#
275# * Restructuring Spider's suggestions.
276#
277# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
278#
279# * ld -s cannot be used in older Digital UNIXes when doing shared.
280#
281#
282# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
283#
284# * -hidden removed.
285#
286# * -DSTANDARD_C removed.
287#
288# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
289#
290# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
291#
292# * -msym for the newer runtime loaders.
293#
294# * $optimize also in $lddflags.
295#
296#
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297# perl5.003_27:
298#
299# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
300#
301# * unset _DEC_cc_style and more commentary on -std.
302#
303#
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304# perl5.003_26:
305#
306# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
307#
e60a08f8 308# * -std and -ansi.
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309#
310#
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311# perl5.003_24:
312#
313# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
314#
315# * Fixing the note on -DDEBUGGING.
316#
317# * Note on -O5 -fast.
318#
319#
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320# perl5.003_23:
321#
322# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
323#
324# * Notes on how to do both optimisation and debugging.
325#
326#
327# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
328#
329# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
330#
331# * Restructure the $lddlflags build.
332#
333# * $optimize based on which compiler we have.
334#
335#
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336# perl5.003_22:
337#
338# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
339#
340# * Added comments 'how to create a debugging version of perl'
341#
342# * Fixed logic of this script to prevent stripping of shared
343# objects by the loader (see ld man page for -s) is debugging
344# is set via the -g switch.
345#
346#
347# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
348#
349# * now 'dl' is always removed from libswanted. Not only if
350# optimize is an empty string.
351#
352#
353# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
354#
355# * Removed 'dl' from libswanted: When the FreePort binary
356# translator for Sun binaries is installed Configure concludes
357# that it should use libdl.x.yz.fpx.so :-(
358# Because the dlopen, dlclose,... calls are in the
359# C library it not necessary at all to check for the
360# dl library. Therefore dl is removed from libswanted.
361#
362#
363# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
364#
365# * Set -Olimit to 3200 because perl_yylex.c got too big
366# for the optimizer.
367#