[p5sagit/p5-mst-13.2.git] / hints / dec_osf.sh

# hints/dec_osf.sh

#	* 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.

# do NOT, I repeat, *NOT* take away those leading tabs
	# reset
	_DEC_uname_r=
	_DEC_cc_style=
	# set
	_DEC_uname_r=`uname -r`
	# _DEC_cc_style set soon below
# Configure Black Magic (TM)

case "$cc" in
*gcc*)	;; # pass
*)	# 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 /tmp/taint$$.o 2>&1`" in
	*/gemc_cc*)	# we have the new DEC GEM CC
			_DEC_cc_style=new
			;;
	*)		# we have the old MIPS CC
			_DEC_cc_style=old
			;;
	esac
	# cleanup
	rm -f /tmp/taint$$.o
	;;
esac

# be nauseatingly ANSI
case "$cc" in
*gcc*)	ccflags="$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" in 
	*gcc*)	
		optimize='-O3'				;;
	*)	case "$_DEC_cc_style" in
		new)	optimize='-O4'			;;
		old)	optimize='-O2 -Olimit 3200'	;;
	    	esac
		ccflags="$ccflags -D_INTRINSICS"
		;;
	esac
	;;
esac

# 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 "$_DEC_uname_r" in
*[123].*)	# old loader
		lddlflags="$lddlflags -O3"
		;;
*)		lddlflags="$lddlflags $optimize -msym"
		# -msym: If using a sufficiently recent /sbin/loader,
		# keep the module symbols with the modules.
		;;
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 "$optimize" in
	*-g*) ;; # left intentionally blank
*)	case "$_DEC_uname_r" in
	*[123].*)
		case "$useshrplib" in
		false|undef|'')	lddlflags="$lddlflags -s"	;;
		esac
		;;
        *) lddlflags="$lddlflags -s"
	        ;;
    	esac
    	;;
esac

if [ "X$usethreads" != "X" ]; then
    ccflags="-DUSE_THREADS $ccflags"
    optimize="-pthread $optimize"
    ldflags="-pthread $ldflags"
    set `echo X "$libswanted "| sed -e 's/ c / pthread c_r /'`
    shift
    libswanted="$*"
    usemymalloc='n'
fi

#
# Unset temporary variables no more needed.
#

unset _DEC_cc_style
unset _DEC_uname_r
    
#
# History:
#
# 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.
#
Commit	Line	Data
a0d0e21e	1	# hints/dec_osf.sh
8e964347	2
b971f6e4	3	# * If you want to debug perl or want to send a
8e964347	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":
	7	#
	8	#optimize=-g2
	9	#
8a019ce7	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.
	12	#
b971f6e4	13	# * gcc can always have both -g and optimisation on.
8a019ce7	14	#
b971f6e4	15	# * debugging optimised code, no matter what compiler
8a019ce7	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.
	21	#
b971f6e4	22	# * Configure will automatically add the often quoted
f2c69087	23	# -DDEBUGGING for you if the -g is specified.
f2c69087	24	#
b971f6e4	25	# * There is even more optimisation available in the new
f2c69087	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.
8e964347	33	#
b971f6e4	34	# * The -std is needed because the following compiled
e60a08f8	35	# without the -std and linked with -lm
	36	#
	37	# #include <math.h>
	38	# #include <stdio.h>
	39	# int main(){short x=10,y=sqrt(x);printf("%d\n",y);}
	40	#
	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.
	44	#
b971f6e4	45	# * Compilation warnings like:
	46	#
	47	# "Undefined the ANSI standard macro ..."
	48	#
	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).
	52	#
8e964347	53
e60a08f8	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.
	60
b971f6e4	61	# do NOT, I repeat, NOT take away those leading tabs
	62	# reset
	63	_DEC_uname_r=
e60a08f8	64	_DEC_cc_style=
b971f6e4	65	# set
	66	_DEC_uname_r=`uname -r`
	67	# _DEC_cc_style set soon below
e60a08f8	68	# Configure Black Magic (TM)
	69
	70	case "$cc" in
	71	gcc) ;; # pass
	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$$.o 2>&1`" in
	75	/gemc_cc) # we have the new DEC GEM CC
dfa3a3d3	76	_DEC_cc_style=new
8a019ce7	77	;;
e60a08f8	78	*) # we have the old MIPS CC
dfa3a3d3	79	_DEC_cc_style=old
8a019ce7	80	;;
e60a08f8	81	esac
	82	# cleanup
	83	rm -f /tmp/taint$$.o
	84	;;
	85	esac
	86
b971f6e4	87	# be nauseatingly ANSI
b971f6e4	88	case "$cc" in
9607fc9c	89	gcc) ccflags="$ccflags -ansi"
b971f6e4	90	;;
	91	*) ccflags="$ccflags -std"
	92	;;
	93	esac
	94
	95	# for gcc the Configure knows about the -fpic:
	96	# position-independent code for dynamic loading
	97
e60a08f8	98	# we want optimisation
	99
	100	case "$optimize" in
	101	'') case "$cc" in
	102	gcc)
	103	optimize='-O3' ;;
	104	*) case "$_DEC_cc_style" in
	105	new) optimize='-O4' ;;
	106	old) optimize='-O2 -Olimit 3200' ;;
	107	esac
b971f6e4	108	ccflags="$ccflags -D_INTRINSICS"
e60a08f8	109	;;
8e964347	110	esac
8e964347	111	;;
1fc4cb55	112	esac
28757baa	113
8e964347	114	# dlopen() is in libc
	115	libswanted="`echo $libswanted \| sed -e 's/ dl / /'`"
	116
b971f6e4	117	# libPW contains nothing useful for perl
8a019ce7	118	libswanted="`echo $libswanted \| sed -e 's/ PW / /'`"
8a019ce7	119
723e14d4	120	# libnet contains nothing useful for perl here, and doesn't work
	121	libswanted="`echo $libswanted \| sed -e 's/ net / /'`"
	122
b971f6e4	123	# libbsd contains nothing used by perl that is not already in libc
8a019ce7	124	libswanted="`echo $libswanted \| sed -e 's/ bsd / /'`"
8a019ce7	125
b971f6e4	126	# libc need not be separately listed
8a019ce7	127	libswanted="`echo $libswanted \| sed -e 's/ c / /'`"
8a019ce7	128
b971f6e4	129	# ndbm is already in libc
b971f6e4	130	libswanted="`echo $libswanted \| sed -e 's/ ndbm / /'`"
8a019ce7	131
	132	# the basic lddlflags used always
	133	lddlflags='-shared -expect_unresolved "*"'
	134
b971f6e4	135	# Fancy compiler suites use optimising linker as well as compiler.
	136	# <spider@Orb.Nashua.NH.US>
	137	case "$_DEC_uname_r" in
	138	[123].) # old loader
	139	lddlflags="$lddlflags -O3"
	140	;;
	141	*) lddlflags="$lddlflags $optimize -msym"
	142	# -msym: If using a sufficiently recent /sbin/loader,
	143	# keep the module symbols with the modules.
	144	;;
	145	esac
	146	# Yes, the above loses if gcc does not use the system linker.
	147	# If that happens, let me know about it. <jhi@iki.fi>
	148
8a019ce7	149
b971f6e4	150	# If debugging or (old systems and doing shared)
	151	# then do not strip the lib, otherwise, strip.
	152	# As noted above the -DDEBUGGING is added automagically by Configure if -g.
8a019ce7	153	case "$optimize" in
8a019ce7	154	-g) ;; # left intentionally blank
b971f6e4	155	*) case "$_DEC_uname_r" in
	156	[123].)
	157	case "$useshrplib" in
	158	false\|undef\|'') lddlflags="$lddlflags -s" ;;
	159	esac
	160	;;
8a019ce7	161	*) lddlflags="$lddlflags -s"
b971f6e4	162	;;
	163	esac
	164	;;
8a019ce7	165	esac
8e964347	166
b981e18e	167	if [ "X$usethreads" != "X" ]; then
	168	ccflags="-DUSE_THREADS $ccflags"
	169	optimize="-pthread $optimize"
	170	ldflags="-pthread $ldflags"
	171	set `echo X "$libswanted "\| sed -e 's/ c / pthread c_r /'`
	172	shift
	173	libswanted="$*"
	174	usemymalloc='n'
	175	fi
	176
8e964347	177	#
e60a08f8	178	# Unset temporary variables no more needed.
	179	#
	180
	181	unset _DEC_cc_style
b971f6e4	182	unset _DEC_uname_r
e60a08f8	183
e60a08f8	184	#
8e964347	185	# History:
8e964347	186	#
723e14d4	187	# perl5.004_04:
	188	#
	189	# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
	190	#
	191	# * libnet on Digital UNIX is for JAVA, not for sockets.
	192	#
	193	#
b971f6e4	194	# perl5.003_28:
	195	#
	196	# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
	197	#
	198	# * Restructuring Spider's suggestions.
	199	#
	200	# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
	201	#
	202	# * ld -s cannot be used in older Digital UNIXes when doing shared.
	203	#
	204	#
	205	# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
	206	#
	207	# * -hidden removed.
	208	#
	209	# * -DSTANDARD_C removed.
	210	#
	211	# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
	212	#
	213	# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
	214	#
	215	# * -msym for the newer runtime loaders.
	216	#
	217	# * $optimize also in $lddflags.
	218	#
	219	#
e60a08f8	220	# perl5.003_27:
	221	#
	222	# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
	223	#
	224	# * unset _DEC_cc_style and more commentary on -std.
	225	#
	226	#
dfa3a3d3	227	# perl5.003_26:
	228	#
	229	# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
	230	#
e60a08f8	231	# * -std and -ansi.
dfa3a3d3	232	#
dfa3a3d3	233	#
f2c69087	234	# perl5.003_24:
	235	#
	236	# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
	237	#
	238	# * Fixing the note on -DDEBUGGING.
	239	#
	240	# * Note on -O5 -fast.
	241	#
	242	#
8a019ce7	243	# perl5.003_23:
	244	#
	245	# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
	246	#
	247	# * Notes on how to do both optimisation and debugging.
	248	#
	249	#
	250	# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
	251	#
	252	# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
	253	#
	254	# * Restructure the $lddlflags build.
	255	#
	256	# * $optimize based on which compiler we have.
	257	#
	258	#
8e964347	259	# perl5.003_22:
	260	#
	261	# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
	262	#
	263	# * Added comments 'how to create a debugging version of perl'
	264	#
	265	# * Fixed logic of this script to prevent stripping of shared
	266	# objects by the loader (see ld man page for -s) is debugging
	267	# is set via the -g switch.
	268	#
	269	#
	270	# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
	271	#
	272	# * now 'dl' is always removed from libswanted. Not only if
	273	# optimize is an empty string.
	274	#
	275	#
	276	# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
	277	#
	278	# * Removed 'dl' from libswanted: When the FreePort binary
	279	# translator for Sun binaries is installed Configure concludes
	280	# that it should use libdl.x.yz.fpx.so :-(
	281	# Because the dlopen, dlclose,... calls are in the
	282	# C library it not necessary at all to check for the
	283	# dl library. Therefore dl is removed from libswanted.
	284	#
	285	#
	286	# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
	287	#
	288	# * Set -Olimit to 3200 because perl_yylex.c got too big
	289	# for the optimizer.
	290	#