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.
63 # do NOT, I repeat, *NOT* take away the leading tabs
64 # Configure Black Magic (TM)
67 case "`$cc -v 2>&1 | grep cc`" in
69 *) # compile something small: taint.c is fine for this.
70 # the main point is the '-v' flag of 'cc'.
71 case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in
72 */gemc_cc*) # we have the new DEC GEM CC
75 *) # we have the old MIPS CC
84 # be nauseatingly ANSI
85 case "`$cc -v 2>&1 | grep gcc`" in
86 *gcc*) ccflags="$ccflags -ansi"
88 *) ccflags="$ccflags -std"
92 # for gcc the Configure knows about the -fpic:
93 # position-independent code for dynamic loading
95 # we want optimisation
98 '') case "`$cc -v 2>&1 | grep gcc`" in
101 *) case "$_DEC_cc_style" in
103 ccflags="$ccflags -fprm d -ieee"
105 old) optimize='-O2 -Olimit 3200' ;;
107 ccflags="$ccflags -D_INTRINSICS"
113 # Make glibpth agree with the compiler suite. Note that /shlib
114 # is not here. That's on purpose. Even though that's where libc
115 # really lives from V4.0 on, the linker (and /sbin/loader) won't
116 # look there by default. The sharable /sbin utilities were all
117 # built with "-Wl,-rpath,/shlib" to get around that. This makes
118 # no attempt to figure out the additional location(s) searched by
119 # gcc, since not all versions of gcc are easily coerced into
120 # revealing that information.
121 glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
122 glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
124 # dlopen() is in libc
125 libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
127 # libPW contains nothing useful for perl
128 libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
130 # libnet contains nothing useful for perl here, and doesn't work
131 libswanted="`echo $libswanted | sed -e 's/ net / /'`"
133 # libbsd contains nothing used by perl that is not already in libc
134 libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
136 # libc need not be separately listed
137 libswanted="`echo $libswanted | sed -e 's/ c / /'`"
139 # ndbm is already in libc
140 libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
142 # the basic lddlflags used always
143 lddlflags='-shared -expect_unresolved "*"'
145 # Fancy compiler suites use optimising linker as well as compiler.
146 # <spider@Orb.Nashua.NH.US>
148 *[123].*) # old loader
149 lddlflags="$lddlflags -O3"
151 *) if $test "X$optimize" = "X$undef"; then
152 lddlflags="$lddlflags -msym"
156 # QAR 56761: -O4 + .so may produce broken code,
157 # fixed in 4.0E or better.
160 lddlflags="$lddlflags $optimize"
163 # -msym: If using a sufficiently recent /sbin/loader,
164 # keep the module symbols with the modules.
165 lddlflags="$lddlflags -msym"
169 # Yes, the above loses if gcc does not use the system linker.
170 # If that happens, let me know about it. <jhi@iki.fi>
173 # If debugging or (old systems and doing shared)
174 # then do not strip the lib, otherwise, strip.
175 # As noted above the -DDEBUGGING is added automagically by Configure if -g.
177 *-g*) ;; # left intentionally blank
178 *) case "`uname -r`" in
180 case "$useshrplib" in
181 false|undef|'') lddlflags="$lddlflags -s" ;;
184 *) lddlflags="$lddlflags -s"
191 # Make embedding in things like INN and Apache more memory friendly.
192 # Keep it overridable on the Configure command line, though, so that
193 # "-Uuseshrplib" prevents this default.
196 case "$_DEC_cc_style.$useshrplib" in
197 new.) useshrplib="$define" ;;
200 # The EFF_ONLY_OK from <sys/access.h> is present but dysfunctional for
201 # [RWX]_OK as of Digital UNIX 4.0[A-D]?. If and when this gets fixed,
202 # please adjust this appropriately. See also pp_sys.c just before the
205 pp_sys_cflags='ccflags="$ccflags -DNO_EFF_ONLY_OK"'
207 # The off_t is already 8 bytes, so we do have largefileness.
209 # This script UU/usethreads.cbu will get 'called-back' by Configure
210 # after it has prompted the user for whether to use threads.
211 cat > UU/usethreads.cbu <<'EOCBU'
212 case "$usethreads" in
214 # Threads interfaces changed with V4.0.
215 case "`$cc -v 2>&1 | grep gcc`" in
216 *gcc*)ccflags="-D_REENTRANT $ccflags" ;;
217 *) case "`uname -r`" in
218 *[123].*) ccflags="-threads $ccflags" ;;
219 *) ccflags="-pthread $ccflags" ;;
224 *[123].*) libswanted="$libswanted pthreads mach exc c_r" ;;
225 *) libswanted="$libswanted pthread exc" ;;
234 # Unset temporary variables no more needed.
244 # September-1998 Jarkko Hietaniemi <jhi@iki.fi>
246 # * Added the -DNO_EFF_ONLY_OK flag ('use filetest;' support).
250 # 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
252 # * Newer Digital UNIX compilers enforce signaling for NaN without
253 # -ieee. Added -fprm d at the same time since it's friendlier for
256 # * Fixed the library search path to match cc, ld, and /sbin/loader.
258 # * Default to building -Duseshrplib on newer systems. -Uuseshrplib
261 # * Fix -pthread additions for useshrplib. ld has no -pthread option.
266 # 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
268 # * libnet on Digital UNIX is for JAVA, not for sockets.
273 # 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
275 # * Restructuring Spider's suggestions.
277 # * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
279 # * ld -s cannot be used in older Digital UNIXes when doing shared.
282 # 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
286 # * -DSTANDARD_C removed.
288 # * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
290 # * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
292 # * -msym for the newer runtime loaders.
294 # * $optimize also in $lddflags.
299 # 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
301 # * unset _DEC_cc_style and more commentary on -std.
306 # 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
313 # 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
315 # * Fixing the note on -DDEBUGGING.
317 # * Note on -O5 -fast.
322 # 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
324 # * Notes on how to do both optimisation and debugging.
327 # 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
329 # * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
331 # * Restructure the $lddlflags build.
333 # * $optimize based on which compiler we have.
338 # 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
340 # * Added comments 'how to create a debugging version of perl'
342 # * Fixed logic of this script to prevent stripping of shared
343 # objects by the loader (see ld man page for -s) is debugging
344 # is set via the -g switch.
347 # 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
349 # * now 'dl' is always removed from libswanted. Not only if
350 # optimize is an empty string.
353 # 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
355 # * Removed 'dl' from libswanted: When the FreePort binary
356 # translator for Sun binaries is installed Configure concludes
357 # that it should use libdl.x.yz.fpx.so :-(
358 # Because the dlopen, dlclose,... calls are in the
359 # C library it not necessary at all to check for the
360 # dl library. Therefore dl is removed from libswanted.
363 # 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
365 # * Set -Olimit to 3200 because perl_yylex.c got too big