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fixes for bugs in /RE/p from Hugo van der Sanden
[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#
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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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61# do NOT, I repeat, *NOT* take away those leading tabs
62 # reset
63 _DEC_uname_r=
e60a08f8 64 _DEC_cc_style=
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65 # set
66 _DEC_uname_r=`uname -r`
67 # _DEC_cc_style set soon below
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68# Configure Black Magic (TM)
69
70case "$cc" in
71*gcc*) ;; # pass
72*) # compile something small: taint.c is fine for this.
73 # the main point is the '-v' flag of 'cc'.
74 case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in
75 */gemc_cc*) # we have the new DEC GEM CC
dfa3a3d3 76 _DEC_cc_style=new
8a019ce7 77 ;;
e60a08f8 78 *) # we have the old MIPS CC
dfa3a3d3 79 _DEC_cc_style=old
8a019ce7 80 ;;
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81 esac
82 # cleanup
83 rm -f /tmp/taint$$.o
84 ;;
85esac
86
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87# be nauseatingly ANSI
88case "$cc" in
9607fc9c 89*gcc*) ccflags="$ccflags -ansi"
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90 ;;
91*) ccflags="$ccflags -std"
92 ;;
93esac
94
95# for gcc the Configure knows about the -fpic:
96# position-independent code for dynamic loading
97
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98# we want optimisation
99
100case "$optimize" in
101'') case "$cc" in
102 *gcc*)
103 optimize='-O3' ;;
104 *) case "$_DEC_cc_style" in
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105 new) optimize='-O4'
106 ccflags="$ccflags -fprm d -ieee"
107 ;;
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108 old) optimize='-O2 -Olimit 3200' ;;
109 esac
b971f6e4 110 ccflags="$ccflags -D_INTRINSICS"
e60a08f8 111 ;;
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112 esac
113 ;;
1fc4cb55 114esac
28757baa 115
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116# Make glibpth agree with the compiler suite. Note that /shlib
117# is not here. That's on purpose. Even though that's where libc
118# really lives from V4.0 on, the linker (and /sbin/loader) won't
119# look there by default. The sharable /sbin utilities were all
120# built with "-Wl,-rpath,/shlib" to get around that. This makes
121# no attempt to figure out the additional location(s) searched by
122# gcc, since not all versions of gcc are easily coerced into
123# revealing that information.
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124glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
125glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
313489a2 126
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127# dlopen() is in libc
128libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
129
b971f6e4 130# libPW contains nothing useful for perl
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131libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
132
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133# libnet contains nothing useful for perl here, and doesn't work
134libswanted="`echo $libswanted | sed -e 's/ net / /'`"
135
b971f6e4 136# libbsd contains nothing used by perl that is not already in libc
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137libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
138
b971f6e4 139# libc need not be separately listed
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140libswanted="`echo $libswanted | sed -e 's/ c / /'`"
141
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142# ndbm is already in libc
143libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
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144
145# the basic lddlflags used always
146lddlflags='-shared -expect_unresolved "*"'
147
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148# Fancy compiler suites use optimising linker as well as compiler.
149# <spider@Orb.Nashua.NH.US>
150case "$_DEC_uname_r" in
151*[123].*) # old loader
152 lddlflags="$lddlflags -O3"
153 ;;
154*) lddlflags="$lddlflags $optimize -msym"
155 # -msym: If using a sufficiently recent /sbin/loader,
156 # keep the module symbols with the modules.
157 ;;
158esac
159# Yes, the above loses if gcc does not use the system linker.
160# If that happens, let me know about it. <jhi@iki.fi>
161
8a019ce7 162
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163# If debugging or (old systems and doing shared)
164# then do not strip the lib, otherwise, strip.
165# As noted above the -DDEBUGGING is added automagically by Configure if -g.
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166case "$optimize" in
167 *-g*) ;; # left intentionally blank
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168*) case "$_DEC_uname_r" in
169 *[123].*)
170 case "$useshrplib" in
171 false|undef|'') lddlflags="$lddlflags -s" ;;
172 esac
173 ;;
8a019ce7 174 *) lddlflags="$lddlflags -s"
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175 ;;
176 esac
177 ;;
8a019ce7 178esac
8e964347 179
e5c9fcd0 180if [ "X$usethreads" = "X$define" ]; then
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181 # Threads interfaces changed with V4.0.
182 case "$_DEC_uname_r" in
183 *[123].*) libswanted="$libswanted pthreads mach exc c_r"
dfe9444c 184 ccflags="-threads $ccflags"
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185 ;;
186 *) libswanted="$libswanted pthread exc"
dfe9444c 187 ccflags="-pthread $ccflags"
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188 ;;
189 esac
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190 usemymalloc='n'
191fi
192
8e964347 193#
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194# Make embedding in things like INN and Apache more memory friendly.
195# Keep it overridable on the Configure command line, though, so that
196# "-Uuseshrplib" prevents this default.
197#
198
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199# This or the glibpth change above breaks the build. Commented out
200# for this snapshot.
201#case "$_DEC_cc_style.$useshrplib" in
202# new.) useshrplib="$define" ;;
203#esac
313489a2 204
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205# The EFF_ONLY_OK from <sys/access.h> is dysfunctional for [RWX]_OK
206# as of Digital UNIX 4.0[A-D]?. If and when this gets fixed, adjust
207# this appropriately.
208
209pp_sys_cflags='ccflags="$ccflags -DNO_EFF_ONLY_OK"'
210
313489a2 211#
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212# Unset temporary variables no more needed.
213#
214
215unset _DEC_cc_style
b971f6e4 216unset _DEC_uname_r
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217
218#
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219# History:
220#
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221# perl5.004_57:
222#
223# 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
224#
225# * Newer Digial UNIX compilers enforce signaling for NaN without
226# -ieee. Added -fprm d at the same time since it's friendlier for
227# embedding.
228#
229# * Fixed the library search path to match cc, ld, and /sbin/loader.
230#
231# * Default to building -Duseshrplib on newer systems. -Uuseshrplib
232# still overrides.
233#
234# * Fix -pthread additions for useshrplib. ld has no -pthread option.
235#
236#
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237# perl5.004_04:
238#
239# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
240#
241# * libnet on Digital UNIX is for JAVA, not for sockets.
242#
243#
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244# perl5.003_28:
245#
246# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
247#
248# * Restructuring Spider's suggestions.
249#
250# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
251#
252# * ld -s cannot be used in older Digital UNIXes when doing shared.
253#
254#
255# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
256#
257# * -hidden removed.
258#
259# * -DSTANDARD_C removed.
260#
261# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
262#
263# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
264#
265# * -msym for the newer runtime loaders.
266#
267# * $optimize also in $lddflags.
268#
269#
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270# perl5.003_27:
271#
272# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
273#
274# * unset _DEC_cc_style and more commentary on -std.
275#
276#
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277# perl5.003_26:
278#
279# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
280#
e60a08f8 281# * -std and -ansi.
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282#
283#
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284# perl5.003_24:
285#
286# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
287#
288# * Fixing the note on -DDEBUGGING.
289#
290# * Note on -O5 -fast.
291#
292#
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293# perl5.003_23:
294#
295# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
296#
297# * Notes on how to do both optimisation and debugging.
298#
299#
300# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
301#
302# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
303#
304# * Restructure the $lddlflags build.
305#
306# * $optimize based on which compiler we have.
307#
308#
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309# perl5.003_22:
310#
311# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
312#
313# * Added comments 'how to create a debugging version of perl'
314#
315# * Fixed logic of this script to prevent stripping of shared
316# objects by the loader (see ld man page for -s) is debugging
317# is set via the -g switch.
318#
319#
320# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
321#
322# * now 'dl' is always removed from libswanted. Not only if
323# optimize is an empty string.
324#
325#
326# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
327#
328# * Removed 'dl' from libswanted: When the FreePort binary
329# translator for Sun binaries is installed Configure concludes
330# that it should use libdl.x.yz.fpx.so :-(
331# Because the dlopen, dlclose,... calls are in the
332# C library it not necessary at all to check for the
333# dl library. Therefore dl is removed from libswanted.
334#
335#
336# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
337#
338# * Set -Olimit to 3200 because perl_yylex.c got too big
339# for the optimizer.
340#