3 # * If you want to debug perl or want to send a
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":
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.
13 # * gcc can always have both -g and optimisation on.
15 # * debugging optimised code, no matter what compiler
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.
22 # * Configure will automatically add the often quoted
23 # -DDEBUGGING for you if the -g is specified.
25 # * There is even more optimisation available in the new
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.
34 # * The -std is needed because the following compiled
35 # without the -std and linked with -lm
39 # int main(){short x=10,y=sqrt(x);printf("%d\n",y);}
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.
45 # * Compilation warnings like:
47 # "Undefined the ANSI standard macro ..."
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).
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.
61 # do NOT, I repeat, *NOT* take away those leading tabs
66 _DEC_uname_r=`uname -r`
67 # _DEC_cc_style set soon below
68 # Configure Black Magic (TM)
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
78 *) # we have the old MIPS CC
87 # be nauseatingly ANSI
89 gcc) ccflags="$ccflags -ansi"
91 *) ccflags="$ccflags -std"
95 # for gcc the Configure knows about the -fpic:
96 # position-independent code for dynamic loading
98 # we want optimisation
104 *) case "$_DEC_cc_style" in
105 new) optimize='-O4' ;;
106 old) optimize='-O2 -Olimit 3200' ;;
108 ccflags="$ccflags -D_INTRINSICS"
114 # dlopen() is in libc
115 libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
117 # libPW contains nothing useful for perl
118 libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
120 # libbsd contains nothing used by perl that is not already in libc
121 libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
123 # libc need not be separately listed
124 libswanted="`echo $libswanted | sed -e 's/ c / /'`"
126 # ndbm is already in libc
127 libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
129 # the basic lddlflags used always
130 lddlflags='-shared -expect_unresolved "*"'
132 # Fancy compiler suites use optimising linker as well as compiler.
133 # <spider@Orb.Nashua.NH.US>
134 case "$_DEC_uname_r" in
135 *[123].*) # old loader
136 lddlflags="$lddlflags -O3"
138 *) lddlflags="$lddlflags $optimize -msym"
139 # -msym: If using a sufficiently recent /sbin/loader,
140 # keep the module symbols with the modules.
143 # Yes, the above loses if gcc does not use the system linker.
144 # If that happens, let me know about it. <jhi@iki.fi>
147 # If debugging or (old systems and doing shared)
148 # then do not strip the lib, otherwise, strip.
149 # As noted above the -DDEBUGGING is added automagically by Configure if -g.
151 *-g*) ;; # left intentionally blank
152 *) case "$_DEC_uname_r" in
154 case "$useshrplib" in
155 false|undef|'') lddlflags="$lddlflags -s" ;;
158 *) lddlflags="$lddlflags -s"
165 # Unset temporary variables no more needed.
176 # 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
178 # * Restructuring Spider's suggestions.
180 # * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
182 # * ld -s cannot be used in older Digital UNIXes when doing shared.
185 # 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
189 # * -DSTANDARD_C removed.
191 # * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
193 # * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
195 # * -msym for the newer runtime loaders.
197 # * $optimize also in $lddflags.
202 # 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
204 # * unset _DEC_cc_style and more commentary on -std.
209 # 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
216 # 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
218 # * Fixing the note on -DDEBUGGING.
220 # * Note on -O5 -fast.
225 # 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
227 # * Notes on how to do both optimisation and debugging.
230 # 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
232 # * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
234 # * Restructure the $lddlflags build.
236 # * $optimize based on which compiler we have.
241 # 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
243 # * Added comments 'how to create a debugging version of perl'
245 # * Fixed logic of this script to prevent stripping of shared
246 # objects by the loader (see ld man page for -s) is debugging
247 # is set via the -g switch.
250 # 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
252 # * now 'dl' is always removed from libswanted. Not only if
253 # optimize is an empty string.
256 # 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
258 # * Removed 'dl' from libswanted: When the FreePort binary
259 # translator for Sun binaries is installed Configure concludes
260 # that it should use libdl.x.yz.fpx.so :-(
261 # Because the dlopen, dlclose,... calls are in the
262 # C library it not necessary at all to check for the
263 # dl library. Therefore dl is removed from libswanted.
266 # 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
268 # * Set -Olimit to 3200 because perl_yylex.c got too big