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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#
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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
105 new) optimize='-O4' ;;
106 old) optimize='-O2 -Olimit 3200' ;;
107 esac
b971f6e4 108 ccflags="$ccflags -D_INTRINSICS"
e60a08f8 109 ;;
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110 esac
111 ;;
1fc4cb55 112esac
28757baa 113
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114# dlopen() is in libc
115libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
116
b971f6e4 117# libPW contains nothing useful for perl
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118libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
119
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120# libnet contains nothing useful for perl here, and doesn't work
121libswanted="`echo $libswanted | sed -e 's/ net / /'`"
122
b971f6e4 123# libbsd contains nothing used by perl that is not already in libc
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124libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
125
b971f6e4 126# libc need not be separately listed
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127libswanted="`echo $libswanted | sed -e 's/ c / /'`"
128
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129# ndbm is already in libc
130libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
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131
132# the basic lddlflags used always
133lddlflags='-shared -expect_unresolved "*"'
134
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135# Fancy compiler suites use optimising linker as well as compiler.
136# <spider@Orb.Nashua.NH.US>
137case "$_DEC_uname_r" in
138*[123].*) # old loader
139 lddlflags="$lddlflags -O3"
140 ;;
141*) lddlflags="$lddlflags $optimize -msym"
142 # -msym: If using a sufficiently recent /sbin/loader,
143 # keep the module symbols with the modules.
144 ;;
145esac
146# Yes, the above loses if gcc does not use the system linker.
147# If that happens, let me know about it. <jhi@iki.fi>
148
8a019ce7 149
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150# If debugging or (old systems and doing shared)
151# then do not strip the lib, otherwise, strip.
152# As noted above the -DDEBUGGING is added automagically by Configure if -g.
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153case "$optimize" in
154 *-g*) ;; # left intentionally blank
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155*) case "$_DEC_uname_r" in
156 *[123].*)
157 case "$useshrplib" in
158 false|undef|'') lddlflags="$lddlflags -s" ;;
159 esac
160 ;;
8a019ce7 161 *) lddlflags="$lddlflags -s"
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162 ;;
163 esac
164 ;;
8a019ce7 165esac
8e964347 166
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167if [ "X$usethreads" != "X" ]; then
168 ccflags="-DUSE_THREADS $ccflags"
169 optimize="-pthread $optimize"
170 ldflags="-pthread $ldflags"
171 set `echo X "$libswanted "| sed -e 's/ c / pthread c_r /'`
172 shift
173 libswanted="$*"
174 usemymalloc='n'
175fi
176
8e964347 177#
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178# Unset temporary variables no more needed.
179#
180
181unset _DEC_cc_style
b971f6e4 182unset _DEC_uname_r
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183
184#
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185# History:
186#
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187# perl5.004_04:
188#
189# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
190#
191# * libnet on Digital UNIX is for JAVA, not for sockets.
192#
193#
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194# perl5.003_28:
195#
196# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
197#
198# * Restructuring Spider's suggestions.
199#
200# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
201#
202# * ld -s cannot be used in older Digital UNIXes when doing shared.
203#
204#
205# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
206#
207# * -hidden removed.
208#
209# * -DSTANDARD_C removed.
210#
211# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
212#
213# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
214#
215# * -msym for the newer runtime loaders.
216#
217# * $optimize also in $lddflags.
218#
219#
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220# perl5.003_27:
221#
222# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
223#
224# * unset _DEC_cc_style and more commentary on -std.
225#
226#
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227# perl5.003_26:
228#
229# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
230#
e60a08f8 231# * -std and -ansi.
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232#
233#
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234# perl5.003_24:
235#
236# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
237#
238# * Fixing the note on -DDEBUGGING.
239#
240# * Note on -O5 -fast.
241#
242#
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243# perl5.003_23:
244#
245# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
246#
247# * Notes on how to do both optimisation and debugging.
248#
249#
250# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
251#
252# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
253#
254# * Restructure the $lddlflags build.
255#
256# * $optimize based on which compiler we have.
257#
258#
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259# perl5.003_22:
260#
261# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
262#
263# * Added comments 'how to create a debugging version of perl'
264#
265# * Fixed logic of this script to prevent stripping of shared
266# objects by the loader (see ld man page for -s) is debugging
267# is set via the -g switch.
268#
269#
270# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
271#
272# * now 'dl' is always removed from libswanted. Not only if
273# optimize is an empty string.
274#
275#
276# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
277#
278# * Removed 'dl' from libswanted: When the FreePort binary
279# translator for Sun binaries is installed Configure concludes
280# that it should use libdl.x.yz.fpx.so :-(
281# Because the dlopen, dlclose,... calls are in the
282# C library it not necessary at all to check for the
283# dl library. Therefore dl is removed from libswanted.
284#
285#
286# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
287#
288# * Set -Olimit to 3200 because perl_yylex.c got too big
289# for the optimizer.
290#