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.
45 # compile something small: taint.c is fine for this.
46 # the main point is the '-v' flag of 'cc'.
47 case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in
49 # we have the new DEC GEM CC
54 # we have the old MIPS CC
55 optimize='-O2 -Olimit 3200'
65 # all compilers are ANSI
66 ccflags="$ccflags -DSTANDARD_C"
68 # be nauseatingly ANSI
70 gcc) ccflags="$ccflags -ansi"
72 *) ccflags="$ccflags -std1"
73 # -vaxc not to get warnings about stuff like$this for VMS.
74 # -vaxc is available only in newer DEC compilers.
75 test X"$_DEC_cc_style"Y = XnewY && ccflags="$ccflags -vaxc"
80 libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
82 # PW contains nothing useful for perl
83 libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
85 # bsd contains nothing used by perl that is not already in libc
86 libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
88 # c need not be separately listed
89 libswanted="`echo $libswanted | sed -e 's/ c / /'`"
91 # dbm is already in libc (as is ndbm)
92 libswanted="`echo $libswanted | sed -e 's/ dbm / /'`"
94 # the basic lddlflags used always
95 lddlflags='-shared -expect_unresolved "*"'
97 # Check if it's a CMW version of OSF1,
98 # if so, do not hide the symbols.
99 test `uname -s` = "MLS+" || lddlflags="$lddlflags -hidden"
101 # If debugging (-g) do not strip the objects, otherwise, strip.
103 *-g*) ;; # left intentionally blank
104 *) lddlflags="$lddlflags -s"
112 # 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
119 # 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
121 # * Fixing the note on -DDEBUGGING.
123 # * Note on -O5 -fast.
128 # 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
130 # * Notes on how to do both optimisation and debugging.
133 # 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
135 # * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
137 # * Restructure the $lddlflags build.
139 # * $optimize based on which compiler we have.
144 # 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
146 # * Added comments 'how to create a debugging version of perl'
148 # * Fixed logic of this script to prevent stripping of shared
149 # objects by the loader (see ld man page for -s) is debugging
150 # is set via the -g switch.
153 # 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
155 # * now 'dl' is always removed from libswanted. Not only if
156 # optimize is an empty string.
159 # 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
161 # * Removed 'dl' from libswanted: When the FreePort binary
162 # translator for Sun binaries is installed Configure concludes
163 # that it should use libdl.x.yz.fpx.so :-(
164 # Because the dlopen, dlclose,... calls are in the
165 # C library it not necessary at all to check for the
166 # dl library. Therefore dl is removed from libswanted.
169 # 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
171 # * Set -Olimit to 3200 because perl_yylex.c got too big