# hints/dec_osf.sh
-optimize="-g"
-ccflags="$ccflags -DSTANDARD_C -DDEBUGGING"
-# Version 1 has problems with -no_archive if only an archive
-# lib is available.
-case "$osvers" in
-1*) lddlflags='-shared -expect_unresolved "*" -s' ;;
-*) lddlflags='-shared -no_archive -expect_unresolved "*" -s' ;;
+
+# * If you want to debug perl or want to send a
+# stack trace for inclusion into an bug report, call
+# Configure with the additional argument -Doptimize=-g2
+# or uncomment this assignment to "optimize":
+#
+#optimize=-g2
+#
+# If you want both to optimise and debug with the DEC cc
+# you must have -g3, e.g. "-O4 -g3", and (re)run Configure.
+#
+# * gcc can always have both -g and optimisation on.
+#
+# * debugging optimised code, no matter what compiler
+# one is using, can be surprising and confusing because of
+# the optimisation tricks like code motion, code removal,
+# loop unrolling, and inlining. The source code and the
+# executable code simply do not agree any more while in
+# mid-execution, the optimiser only cares about the results.
+#
+# * Configure will automatically add the often quoted
+# -DDEBUGGING for you if the -g is specified.
+#
+# * There is even more optimisation available in the new
+# (GEM) DEC cc: -O5 and -fast. "man cc" will tell more about them.
+# The jury is still out whether either or neither help for Perl
+# and how much. Based on very quick testing, -fast boosts
+# raw data copy by about 5-15% (-fast brings in, among other
+# things, inlined, ahem, fast memcpy()), while on the other
+# hand searching things (index, m//, s///), seems to get slower.
+# Your mileage will vary.
+#
+# * The -std is needed because the following compiled
+# without the -std and linked with -lm
+#
+# #include <math.h>
+# #include <stdio.h>
+# int main(){short x=10,y=sqrt(x);printf("%d\n",y);}
+#
+# will in Digital UNIX 3.* and 4.0b print 0 -- and in Digital
+# UNIX 4.0{,a} dump core: Floating point exception in the printf(),
+# the y has become a signaling NaN.
+#
+# * Compilation warnings like:
+#
+# "Undefined the ANSI standard macro ..."
+#
+# can be ignored, at least while compiling the POSIX extension
+# and especially if using the sfio (the latter is not a standard
+# part of Perl, never mind if it says little to you).
+#
+
+# If using the DEC compiler we must find out the DEC compiler style:
+# the style changed between Digital UNIX (aka DEC OSF/1) 3 and
+# Digital UNIX 4. The old compiler was originally from Ultrix and
+# the MIPS company, the new compiler is originally from the VAX world
+# and it is called GEM. Many of the options we are going to use depend
+# on the compiler style.
+
+cc=${cc:-cc}
+
+# do NOT, I repeat, *NOT* take away the leading tabs
+# Configure Black Magic (TM)
+ # reset
+ _DEC_cc_style=
+case "`$cc -v 2>&1 | grep cc`" in
+*gcc*) _gcc_version=`$cc -v 2>&1 | grep "gcc version" | sed 's%^gcc version \([0-9]*\)\.\([0-9]*\) .*%\1 \2%'`
+ set $_gcc_version
+ if test "$1" -lt 2 -o \( "$1" -eq 2 -a "$2" -lt 95 \); then
+ cat >&4 <<EOF
+
+Your cc seems to be gcc and its version seems to be less than 2.95.
+This is not a good idea since old versions of gcc are known to produce
+buggy code when compiling Perl (and no doubt for other programs, too).
+
+Therefore, I strongly suggest upgrading your gcc. (Why don't you
+use the vendor cc is also a good question. It comes with the operating
+system and produces good code.)
+
+Note that as of gcc 2.95 (19990728) and Perl 5.6.0 (end of March 2000)
+if the said Perl is compiled with the said gcc the lib/sdbm test will
+dump core. As this doesn't happen with the vendor cc, this is
+most probably a lingering bug in gcc. Therefore unless you have
+a better gcc you are still better off using the vendor cc.
+
+Cannot continue, aborting.
+
+EOF
+ exit 1
+ fi
+ ;;
+*) # compile something small: taint.c is fine for this.
+ # the main point is the '-v' flag of 'cc'.
+ case "`cc -v -I. -c taint.c -o taint$$.o 2>&1`" in
+ */gemc_cc*) # we have the new DEC GEM CC
+ _DEC_cc_style=new
+ ;;
+ *) # we have the old MIPS CC
+ _DEC_cc_style=old
+ ;;
+ esac
+ # cleanup
+ rm -f taint$$.o
+ ;;
esac
+
+# be nauseatingly ANSI
+case "`$cc -v 2>&1 | grep gcc`" in
+*gcc*) ccflags="$ccflags -ansi"
+ ;;
+*) ccflags="$ccflags -std"
+ ;;
+esac
+
+# for gcc the Configure knows about the -fpic:
+# position-independent code for dynamic loading
+
+# we want optimisation
+
+case "$optimize" in
+'') case "`$cc -v 2>&1 | grep gcc`" in
+ *gcc*)
+ optimize='-O3' ;;
+ *) case "$_DEC_cc_style" in
+ new) optimize='-O4'
+ ccflags="$ccflags -fprm d -ieee"
+ ;;
+ old) optimize='-O2 -Olimit 3200' ;;
+ esac
+ ccflags="$ccflags -D_INTRINSICS"
+ ;;
+ esac
+ ;;
+esac
+
+# Make glibpth agree with the compiler suite. Note that /shlib
+# is not here. That's on purpose. Even though that's where libc
+# really lives from V4.0 on, the linker (and /sbin/loader) won't
+# look there by default. The sharable /sbin utilities were all
+# built with "-Wl,-rpath,/shlib" to get around that. This makes
+# no attempt to figure out the additional location(s) searched by
+# gcc, since not all versions of gcc are easily coerced into
+# revealing that information.
+glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
+glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
+
+# dlopen() is in libc
+libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
+
+# libPW contains nothing useful for perl
+libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
+
+# libnet contains nothing useful for perl here, and doesn't work
+libswanted="`echo $libswanted | sed -e 's/ net / /'`"
+
+# libbsd contains nothing used by perl that is not already in libc
+libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
+
+# libc need not be separately listed
+libswanted="`echo $libswanted | sed -e 's/ c / /'`"
+
+# ndbm is already in libc
+libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
+
+# the basic lddlflags used always
+lddlflags='-shared -expect_unresolved "*"'
+
+# Fancy compiler suites use optimising linker as well as compiler.
+# <spider@Orb.Nashua.NH.US>
+case "`uname -r`" in
+*[123].*) # old loader
+ lddlflags="$lddlflags -O3"
+ ;;
+*) if $test "X$optimize" = "X$undef"; then
+ lddlflags="$lddlflags -msym"
+ else
+ case "`/usr/sbin/sizer -v`" in
+ *4.0D*)
+ # QAR 56761: -O4 + .so may produce broken code,
+ # fixed in 4.0E or better.
+ ;;
+ *)
+ lddlflags="$lddlflags $optimize"
+ ;;
+ esac
+ # -msym: If using a sufficiently recent /sbin/loader,
+ # keep the module symbols with the modules.
+ lddlflags="$lddlflags -msym -std"
+ fi
+ ;;
+esac
+# Yes, the above loses if gcc does not use the system linker.
+# If that happens, let me know about it. <jhi@iki.fi>
+
+
+# If debugging or (old systems and doing shared)
+# then do not strip the lib, otherwise, strip.
+# As noted above the -DDEBUGGING is added automagically by Configure if -g.
+case "$optimize" in
+ *-g*) ;; # left intentionally blank
+*) case "`uname -r`" in
+ *[123].*)
+ case "$useshrplib" in
+ false|undef|'') lddlflags="$lddlflags -s" ;;
+ esac
+ ;;
+ *) lddlflags="$lddlflags -s"
+ ;;
+ esac
+ ;;
+esac
+
+#
+# Make embedding in things like INN and Apache more memory friendly.
+# Keep it overridable on the Configure command line, though, so that
+# "-Uuseshrplib" prevents this default.
+#
+
+case "$_DEC_cc_style.$useshrplib" in
+ new.) useshrplib="$define" ;;
+esac
+
+# The EFF_ONLY_OK from <sys/access.h> is present but dysfunctional for
+# [RWX]_OK as of Digital UNIX 4.0[A-D]?. If and when this gets fixed,
+# please adjust this appropriately. See also pp_sys.c just before the
+# emulate_eaccess().
+
+# Fixed in V5.0A.
+case "`/usr/sbin/sizer -v`" in
+*5.0[A-Z]*|*5.[1-9]*|*[6-9].[0-9]*)
+ : ok
+ ;;
+*)
+# V5.0 or previous
+pp_sys_cflags='ccflags="$ccflags -DNO_EFF_ONLY_OK"'
+ ;;
+esac
+
+# The off_t is already 8 bytes, so we do have largefileness.
+
+cat > UU/usethreads.cbu <<'EOCBU'
+# This script UU/usethreads.cbu will get 'called-back' by Configure
+# after it has prompted the user for whether to use threads.
+case "$usethreads" in
+$define|true|[yY]*)
+ # Threads interfaces changed with V4.0.
+ case "`$cc -v 2>&1 | grep gcc`" in
+ *gcc*)ccflags="-D_REENTRANT $ccflags" ;;
+ *) case "`uname -r`" in
+ *[123].*) ccflags="-threads $ccflags" ;;
+ *) ccflags="-pthread $ccflags" ;;
+ esac
+ ;;
+ esac
+ case "`uname -r`" in
+ *[123].*) libswanted="$libswanted pthreads mach exc c_r" ;;
+ *) libswanted="$libswanted pthread exc" ;;
+ esac
+
+ case "$usemymalloc" in
+ '')
+ usemymalloc='n'
+ ;;
+ esac
+ ;;
+esac
+EOCBU
+
+cat > UU/uselongdouble.cbu <<'EOCBU'
+# This script UU/uselongdouble.cbu will get 'called-back' by Configure
+# after it has prompted the user for whether to use long doubles.
+case "$uselongdouble" in
+$define|true|[yY]*) d_Gconvert='sprintf((b),"%.*Lg",(n),(x))' ;;
+esac
+EOCBU
+
+#
+# Unset temporary variables no more needed.
+#
+
+unset _DEC_cc_style
+
+#
+# History:
+#
+# perl5.005_51:
+#
+# September-1998 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * Added the -DNO_EFF_ONLY_OK flag ('use filetest;' support).
+#
+# perl5.004_57:
+#
+# 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
+#
+# * Newer Digital UNIX compilers enforce signaling for NaN without
+# -ieee. Added -fprm d at the same time since it's friendlier for
+# embedding.
+#
+# * Fixed the library search path to match cc, ld, and /sbin/loader.
+#
+# * Default to building -Duseshrplib on newer systems. -Uuseshrplib
+# still overrides.
+#
+# * Fix -pthread additions for useshrplib. ld has no -pthread option.
+#
+#
+# perl5.004_04:
+#
+# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
+#
+# * libnet on Digital UNIX is for JAVA, not for sockets.
+#
+#
+# perl5.003_28:
+#
+# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * Restructuring Spider's suggestions.
+#
+# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
+#
+# * ld -s cannot be used in older Digital UNIXes when doing shared.
+#
+#
+# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
+#
+# * -hidden removed.
+#
+# * -DSTANDARD_C removed.
+#
+# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
+#
+# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
+#
+# * -msym for the newer runtime loaders.
+#
+# * $optimize also in $lddflags.
+#
+#
+# perl5.003_27:
+#
+# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * unset _DEC_cc_style and more commentary on -std.
+#
+#
+# perl5.003_26:
+#
+# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * -std and -ansi.
+#
+#
+# perl5.003_24:
+#
+# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * Fixing the note on -DDEBUGGING.
+#
+# * Note on -O5 -fast.
+#
+#
+# perl5.003_23:
+#
+# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * Notes on how to do both optimisation and debugging.
+#
+#
+# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
+#
+# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
+#
+# * Restructure the $lddlflags build.
+#
+# * $optimize based on which compiler we have.
+#
+#
+# perl5.003_22:
+#
+# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
+#
+# * Added comments 'how to create a debugging version of perl'
+#
+# * Fixed logic of this script to prevent stripping of shared
+# objects by the loader (see ld man page for -s) is debugging
+# is set via the -g switch.
+#
+#
+# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
+#
+# * now 'dl' is always removed from libswanted. Not only if
+# optimize is an empty string.
+#
+#
+# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
+#
+# * Removed 'dl' from libswanted: When the FreePort binary
+# translator for Sun binaries is installed Configure concludes
+# that it should use libdl.x.yz.fpx.so :-(
+# Because the dlopen, dlclose,... calls are in the
+# C library it not necessary at all to check for the
+# dl library. Therefore dl is removed from libswanted.
+#
+#
+# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
+#
+# * Set -Olimit to 3200 because perl_yylex.c got too big
+# for the optimizer.
+#
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