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Eliminate FP exceptions under SCO 5
[perl5.git] / hints / dec_osf.sh
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a0d0e21e 1# hints/dec_osf.sh
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2
3#
4# How to make a DEBUGGING VERSION of perl for DECs cc compiler
5#
6# If you want to debug perl or want to send a
7# stack trace for inclusion into an bug report, call
8# Configure with the additional argument -Doptimize=-g2
9# or uncomment this assignment to "optimize":
10#
11#optimize=-g2
12#
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13# If you want both to optimise and debug with the DEC cc
14# you must have -g3, e.g. "-O4 -g3", and (re)run Configure.
15#
16# Note 1: gcc can always have both -g and optimisation on.
17#
18# Note 2: debugging optimised code, no matter what compiler
19# one is using, can be surprising and confusing because of
20# the optimisation tricks like code motion, code removal,
21# loop unrolling, and inlining. The source code and the
22# executable code simply do not agree any more while in
23# mid-execution, the optimiser only cares about the results.
24#
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25# Note 3: Configure will automatically add the often quoted
26# -DDEBUGGING for you if the -g is specified.
27#
28# Note 4: There is even more optimisation available in the new
29# (GEM) DEC cc: -O5 and -fast. "man cc" will tell more about them.
30# The jury is still out whether either or neither help for Perl
31# and how much. Based on very quick testing, -fast boosts
32# raw data copy by about 5-15% (-fast brings in, among other
33# things, inlined, ahem, fast memcpy()), while on the other
34# hand searching things (index, m//, s///), seems to get slower.
35# Your mileage will vary.
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36#
37
1fc4cb55 38case "$optimize" in
8e964347 39'') case "$cc" in
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40 *gcc*)
41 optimize='-O3'
42 ;;
43 *)
44 # compile something small: taint.c is fine for this.
45 # the main point is the '-v' flag of 'cc'.
46 case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in
47 */gemc_cc*)
48 # we have the new DEC GEM CC
49 optimize='-O4'
50 ;;
51 *)
52 # we have the old MIPS CC
53 optimize='-O2 -Olimit 3200'
54 ;;
55 esac
56 # cleanup
57 rm -f /tmp/taint$$.o
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58 esac
59 ;;
1fc4cb55 60esac
28757baa 61
8a019ce7 62# all compilers are ANSI
fed7345c 63ccflags="$ccflags -DSTANDARD_C"
28757baa 64
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65# dlopen() is in libc
66libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
67
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68# PW contains nothing useful for perl
69libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
70
71# bsd contains nothing used by perl that is not already in libc
72libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
73
74# c need not be separately listed
75libswanted="`echo $libswanted | sed -e 's/ c / /'`"
76
77# dbm is already in libc (as is ndbm)
78libswanted="`echo $libswanted | sed -e 's/ dbm / /'`"
79
80# the basic lddlflags used always
81lddlflags='-shared -expect_unresolved "*"'
82
83# Check if it's a CMW version of OSF1,
84# if so, do not hide the symbols.
85test `uname -s` = "MLS+" || lddlflags="$lddlflags -hidden"
86
87# If debugging (-g) do not strip the objects, otherwise, strip.
88case "$optimize" in
89 *-g*) ;; # left intentionally blank
90 *) lddlflags="$lddlflags -s"
91esac
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92
93#
94# History:
95#
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96# perl5.003_24:
97#
98# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
99#
100# * Fixing the note on -DDEBUGGING.
101#
102# * Note on -O5 -fast.
103#
104#
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105# perl5.003_23:
106#
107# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
108#
109# * Notes on how to do both optimisation and debugging.
110#
111#
112# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
113#
114# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
115#
116# * Restructure the $lddlflags build.
117#
118# * $optimize based on which compiler we have.
119#
120#
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121# perl5.003_22:
122#
123# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
124#
125# * Added comments 'how to create a debugging version of perl'
126#
127# * Fixed logic of this script to prevent stripping of shared
128# objects by the loader (see ld man page for -s) is debugging
129# is set via the -g switch.
130#
131#
132# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
133#
134# * now 'dl' is always removed from libswanted. Not only if
135# optimize is an empty string.
136#
137#
138# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
139#
140# * Removed 'dl' from libswanted: When the FreePort binary
141# translator for Sun binaries is installed Configure concludes
142# that it should use libdl.x.yz.fpx.so :-(
143# Because the dlopen, dlclose,... calls are in the
144# C library it not necessary at all to check for the
145# dl library. Therefore dl is removed from libswanted.
146#
147#
148# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
149#
150# * Set -Olimit to 3200 because perl_yylex.c got too big
151# for the optimizer.
152#