X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=hints%2Fmachten.sh;h=cc663a9efb2672609b35f5761121b571f9990a99;hb=07867069da616ed679f2e5fa3023ca3f186d3e48;hp=2ae79f17e3735bf222b155263f610f149a5f8b14;hpb=6ee623d521a149edc6574c512fa951a192cd086a;p=p5sagit%2Fp5-mst-13.2.git diff --git a/hints/machten.sh b/hints/machten.sh index 2ae79f1..cc663a9 100644 --- a/hints/machten.sh +++ b/hints/machten.sh @@ -13,6 +13,19 @@ # Martijn Koster # Richard Yeh # +# Disable shadow password file access: MT 4.1.1 has necessary library +# functions, but not header file (or documentation) +# -- Dominic Dunlop 990804 +# For now, explicitly disable dynamic loading -- MT 4.1.1 has it, +# but these hints do not yet support it. +# Define NOTEDEF_MACHTEN to undo gratuitous Tenon hack to signal.h. +# -- Dominic Dunlop 9800802 +# Completely disable SysV IPC pending more complete support from Tenon +# -- Dominic Dunlop 980712 +# Use vfork and perl's malloc by default +# -- Dominic Dunlop 980630 +# Raise perl's stack size again; cut down reg_infty; document +# -- Dominic Dunlop 980619 # Use of semctl() can crash system: disable -- Dominic Dunlop 980506 # Raise stack size further; slight tweaks to accomodate MT 4.1 # -- Dominic Dunlop 980211 @@ -26,21 +39,107 @@ # # Comments, questions, and improvements welcome! # -# MachTen 4.X does support dynamic loading, but perl doesn't +# MachTen 4.1.1's support for shadow password file access is incomplete: +# disable its use completely. +d_endspent=${d_endspent:-undef} +d_getspent=${d_getspent:-undef} +d_getspnam=${d_getspnam:-undef} +d_setspent=${d_setspent:-undef} + +# MachTen 4.1.1 does support dynamic loading, but perl doesn't # know how to use it yet. +usedl=${usedl:-undef} + +# MachTen 4.1.1 may have an unhelpful hack in /usr/include/signal.h. +# Undo it if so. +if grep NOTDEF_MACHTEN /usr/include/signal.h > /dev/null +then + ccflags="$ccflags -DNOTDEF_MACHTEN" +fi # Power MachTen is a real memory system and its standard malloc # has been optimized for this. Using this malloc instead of Perl's -# malloc may result in significant memory savings. -usemymalloc='false' +# malloc may result in significant memory savings. In particular, +# unlike most UNIX memory allocation subsystems, MachTen's free() +# really does return unneeded process data memory to the system. +# However, MachTen's malloc() is woefully slow -- maybe 100 times +# slower than perl's own, so perl's own is usually the better +# choice. In order to use perl's malloc(), the sbrk() system call +# must be simulated using MachTen's malloc(). See malloc.c for +# precise details of how this is achieved. Recent improvements +# to perl's malloc() currently crash MachTen, and so are disabled +# by -DPLAIN_MALLOC and -DNO_FANCY_MALLOC. +usemymalloc=${usemymalloc:-y} + +# Do not wrap the following long line +malloc_cflags='ccflags="$ccflags -DPLAIN_MALLOC -DNO_FANCY_MALLOC -DUSE_PERL_SBRK"' + +# When MachTen does a fork(), it immediately copies the whole of +# the parent process' data space for the child. This can be +# expensive. Using vfork() where appropriate avoids this cost. +d_vfork=${d_vfork:-define} + +# Specify a high level of optimization (-O3 wouldn't do much more) +optimize=${optimize:--O2 -fomit-frame-pointer} # Make symbol table listings les voluminous nmopts=-gp -# Increase perl's stack size. Without this, lib/complex.t crashes out. -# Particularly perverse programs may require that perl has an even larger -# stack allocation than that specified here. (See man setstackspace ) -ldflags='-Xlstack=0x018000' +# Set reg_infty -- the maximum allowable number of repeats in regular +# expressions such as /a{1,$max_repeats}/, and the maximum number of +# times /a*/ will match. Setting this too high without having a stack +# large enough to accommodate deep recursion in the regular expression +# engine allows perl to crash your Mac due to stack overrun if it +# encounters a pathological regular expression. The default is a +# compromise between capability and required stack size (see below). +# You may override the default value from the Configure command-line +# like this: +# +# Configure -Dreg_infty=16368 ... + +reg_infty=${reg_infty:-2047} + +# If you want to have many perl processes active simultaneously -- +# processing CGI forms -- for example, you should opt for a small stack. +# For safety, you should set reg_infty no larger than the corresponding +# value given in this table: +# +# Stack size reg_infty value supported +# ---------- ------------------------- +# 128k 2**8-1 (256) +# 256k 2**9-1 (511) +# 512k 2**10-1 (1023) +# 1M 2**11-1 (2047) +# ... +# 16M 2**15-1 (32767) (perl's default value) + +# This script selects a safe stack size based on the value of reg_infty +# specified above. However, you may choose to take a risk and set +# stack size lower: pathological regular expressions are rare in real-world +# programs. But be aware that, if perl does encounter one, it WILL +# crash your system. Do not set stack size lower than 96k unless +# you want perl's installation tests ( make test ) to crash your system. +# +# You may override the default value from the Configure command-line +# by specifying the required size in kilobytes like this: +# +# Configure -Dstack_size=96 + +if [ "X$stack_size" = 'X' ] +then + stack_size=128 + X=`expr $reg_infty / 256` + + while [ $X -gt 0 ] + do + X=`expr $X / 2` + stack_size=`expr $stack_size \* 2` + done + X=`expr $stack_size \* 1024` +fi + +ldflags="$ldflags -Xlstack=$X" +ccflags="$ccflags -DREG_INFTY=$reg_infty" # Install in /usr/local by default prefix='/usr/local' @@ -54,8 +153,12 @@ alignbytes=8 # friends. Use setjmp and friends instead. expr "$osvers" \< "4.0.3" > /dev/null && d_sigsetjmp='undef' -# semctl(.., .., IPC_STATUS, ..) hangs system: say we don't have semctl() -d_semctl='undef' +# System V IPC support in MachTen 4.1 is incomplete (missing msg function +# prototypes, no ftok()), buggy (semctl(.., .., IPC_STATUS, ..) hangs +# system), and undocumented. Claim it's not there until things improve. +d_msg=${d_msg:-undef} +d_sem=${d_sem:-undef} +d_shm=${d_shm:-undef} # Get rid of some extra libs which it takes Configure a tediously # long time never to find on MachTen @@ -77,24 +180,45 @@ libswanted="$*" # Propagating recommended variable dont_use_nlink dont_use_nlink=define -cat <<'EOM' >&4 +cat <&4 During Configure, you may see the message *** WHOA THERE!!! *** - The recommended value for $d_semctl on this machine was "undef"! + The recommended value for \$d_msg on this machine was "undef"! Keep the recommended value? [y] -Select the default answer: semctl() is buggy, and perl should be built -without it. +as well as similar messages concerning \$d_sem and \$d_shm. Select the +default answers: MachTen 4.1 appears to provide System V IPC support, +but it is incomplete and buggy: perl should be built without it. + +Similarly, when you see + +*** WHOA THERE!!! *** + The recommended value for \$d_vfork on this machine was "define"! + Keep the recommended value? [y] + +select the default answer: vfork() works, and avoids expensive data +copying. + +You may also see "WHOA THERE!!!" messages concerning \$d_endspent, +\$d_getspent, \$d_getspnam and \$d_setspent. In all cases, select the +default answer: MachTen's support for shadow password file access is +incomplete, and should not be used. At the end of Configure, you will see a harmless message Hmm...You had some extra variables I don't know about...I'll try to keep 'em. Propagating recommended variable dont_use_nlink Propagating recommended variable nmopts + Propagating recommended variable malloc_cflags... + Propagating recommended variable reg_infty Read the File::Find documentation for more information about dont_use_nlink +Your perl will be built with a stack size of ${stack_size}k and a regular +expression repeat count limit of $reg_infty. If you want alternative +values, see the file hints/machten.sh for advice on how to change them. + Tests io/fs test 4 and op/stat test 3 @@ -104,3 +228,5 @@ on directories. EOM expr "$osvers" \< "4.1" >/dev/null && test -r ./broken-db.msg && \ . ./broken-db.msg + +unset stack_size X