4 # How to make a DEBUGGING VERSION of perl for DECs cc compiler
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":
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.
16 # Note 1: gcc can always have both -g and optimisation on.
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.
25 # Note 3: Configure will automatically add the often quoted
26 # -DDEBUGGING for you if the -g is specified.
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.
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
48 # we have the new DEC GEM CC
52 # we have the old MIPS CC
53 optimize='-O2 -Olimit 3200'
62 # we want optimisation
68 *) case "$_DEC_cc_style" in
69 new) optimize='-O4' ;;
70 old) optimize='-O2 -Olimit 3200' ;;
77 # all compilers are ANSI
78 ccflags="$ccflags -DSTANDARD_C"
81 libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
83 # PW contains nothing useful for perl
84 libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
86 # bsd contains nothing used by perl that is not already in libc
87 libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
89 # c need not be separately listed
90 libswanted="`echo $libswanted | sed -e 's/ c / /'`"
92 # dbm is already in libc (as is ndbm)
93 libswanted="`echo $libswanted | sed -e 's/ dbm / /'`"
95 # the basic lddlflags used always
96 lddlflags='-shared -expect_unresolved "*"'
98 # Check if it's a CMW version of OSF1,
99 # if so, do not hide the symbols.
100 test `uname -s` = "MLS+" || lddlflags="$lddlflags -hidden"
102 # If debugging (-g) do not strip the objects, otherwise, strip.
104 *-g*) ;; # left intentionally blank
105 *) lddlflags="$lddlflags -s"
109 # Unset temporary variables no more needed.
119 # 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
121 # * unset _DEC_cc_style and more commentary on -std1.
126 # 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
128 # * Fixing the note on -DDEBUGGING.
130 # * Note on -O5 -fast.
135 # 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
137 # * Notes on how to do both optimisation and debugging.
140 # 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
142 # * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
144 # * Restructure the $lddlflags build.
146 # * $optimize based on which compiler we have.
151 # 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
153 # * Added comments 'how to create a debugging version of perl'
155 # * Fixed logic of this script to prevent stripping of shared
156 # objects by the loader (see ld man page for -s) is debugging
157 # is set via the -g switch.
160 # 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
162 # * now 'dl' is always removed from libswanted. Not only if
163 # optimize is an empty string.
166 # 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
168 # * Removed 'dl' from libswanted: When the FreePort binary
169 # translator for Sun binaries is installed Configure concludes
170 # that it should use libdl.x.yz.fpx.so :-(
171 # Because the dlopen, dlclose,... calls are in the
172 # C library it not necessary at all to check for the
173 # dl library. Therefore dl is removed from libswanted.
176 # 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
178 # * Set -Olimit to 3200 because perl_yylex.c got too big