gcc/genmultilib

   1 #!/bin/sh
   2 # Generates multilib.h.
   3 #   Copyright (C) 1994-2021 Free Software Foundation, Inc.
   4
   5 #This file is part of GCC.
   6
   7 #GCC is free software; you can redistribute it and/or modify it under
   8 #the terms of the GNU General Public License as published by the Free
   9 #Software Foundation; either version 3, or (at your option) any later
  10 #version.
  11
  12 #GCC is distributed in the hope that it will be useful, but WITHOUT
  13 #ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 #FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 #for more details.
  16
  17 #You should have received a copy of the GNU General Public License
  18 #along with GCC; see the file COPYING3.  If not see
  19 #<http://www.gnu.org/licenses/>.
  20
  21 # This shell script produces a header file which the gcc driver
  22 # program uses to pick which library to use based on the machine
  23 # specific options that it is given.
  24
  25 # The first argument is a list of sets of options.  The elements in
  26 # the list are separated by spaces.  Within an element, the options
  27 # are separated by slashes or pipes.  No leading dash is used on the
  28 # options.
  29 # Each option in a set separated by slashes is mutually incompatible
  30 # with all other options
  31 # in the set.
  32 # Each option in a set separated by pipes will be used for the library
  33 # compilation and any of the options in the set will be sufficient
  34 # for it to be triggered.
  35
  36 # The optional second argument is a list of subdirectory names.  If
  37 # the second argument is non-empty, there must be as many elements in
  38 # the second argument as there are options in the first argument.  The
  39 # elements in the second list are separated by spaces.  If the second
  40 # argument is empty, the option names will be used as the directory
  41 # names.
  42
  43 # The optional third argument is a list of options which are
  44 # identical.  The elements in the list are separated by spaces.  Each
  45 # element must be of the form OPTION=OPTION.  The first OPTION should
  46 # appear in the first argument, and the second should be a synonym for
  47 # it.  Question marks are replaced with equal signs in both options.
  48
  49 # The optional fourth argument is a list of multilib directory
  50 # combinations that should not be built.
  51
  52 # The optional fifth argument is a list of options that should be
  53 # used whenever building multilib libraries.
  54
  55 # The optional sixth argument is a list of exclusions used internally by
  56 # the compiler similar to exceptions. The difference being that exclusions
  57 # allow matching default options that genmultilib does not know about and
  58 # is done at runtime as opposed to being sorted out at compile time.
  59 # Each element in the list is a separate exclusion rule. Each rule is
  60 # a list of options (sans preceding '-') separated by a '/'. The options
  61 # on the rule are grouped as an AND operation, and all options much match
  62 # for the rule to exclude a set. Options can be preceded with a '!' to
  63 # match a logical NOT.
  64
  65 # The optional seventh argument is a list of OS subdirectory names.
  66 # The format is either the same as of the second argument, or a set of
  67 # mappings. When it is the same as the second argument, it describes
  68 # the multilib directories using OS conventions, rather than GCC
  69 # conventions.  When it is a set of mappings of the form gccdir=osdir,
  70 # the left side gives the GCC convention and the right gives the
  71 # equivalent OS defined location.  If the osdir part begins with a !,
  72 # the os directory names are used exclusively.  Use the mapping when
  73 # there is no one-to-one equivalence between GCC levels and the OS.
  74
  75 # The optional eighth argument which intends to reduce the effort to write
  76 # so many MULTILIB_EXCEPTIONS rules. This option defines a series of option
  77 # combinations that we actually required.
  78 # For some cases, the generated option combinations are far more than what
  79 # we need, we have to write a lot of rules to screen out combinations we
  80 # don't need. If we missed some rules, the unexpected libraries will be built.
  81 # Now with this argument, one can simply give what combinations are needed.
  82 # It is pretty straigtforward.
  83 # This argument can be used together with MULTILIB_EXCEPTIONS and will take
  84 # effect after the MULTILIB_EXCEPTIONS.
  85
  86 # The optional ninth argument is the multiarch name.
  87
  88 # The optional tenth argument specifies how to reuse multilib for different
  89 # option sets.
  90
  91 # The last option should be "yes" if multilibs are enabled.  If it is not
  92 # "yes", all GCC multilib dir names will be ".".
  93
  94 # The output looks like
  95 #   #define MULTILIB_MATCHES "\
  96 #   SUBDIRECTORY OPTIONS;\
  97 #   ...
  98 #   "
  99 # The SUBDIRECTORY is the subdirectory to use.  The OPTIONS are
 100 # multiple options separated by spaces.  Each option may start with an
 101 # exclamation point.  gcc will consider each line in turn.  If none of
 102 # the options beginning with an exclamation point are present, and all
 103 # of the other options are present, that subdirectory will be used.
 104 # The order of the subdirectories is such that they can be created in
 105 # order; that is, a subdirectory is preceded by all its parents.
 106
 107 # Here is an example (this is from the actual sparc64 case):
 108 #   genmultilib 'm64/m32 mno-app-regs|mcmodel=medany' '64 32 alt'
 109 #               'mcmodel?medany=mcmodel?medmid' 'm32/mno-app-regs* m32/mcmodel=*'
 110 #               '' 'm32/!m64/mno-app-regs m32/!m64/mcmodel=medany'
 111 #               '../lib64 ../lib32 alt' '' '' '' yes
 112 # This produces:
 113 #   ". !m64 !m32 !mno-app-regs !mcmodel=medany;",
 114 #   "64:../lib64 m64 !m32 !mno-app-regs !mcmodel=medany;",
 115 #   "32:../lib32 !m64 m32 !mno-app-regs !mcmodel=medany;",
 116 #   "alt !m64 !m32 mno-app-regs mcmodel=medany;",
 117 #   "alt !m64 !m32 mno-app-regs !mcmodel=medany;",
 118 #   "alt !m64 !m32 !mno-app-regs mcmodel=medany;",
 119 #   "64/alt:../lib64/alt m64 !m32 mno-app-regs mcmodel=medany;",
 120 #   "64/alt:../lib64/alt m64 !m32 mno-app-regs !mcmodel=medany;",
 121 #   "64/alt:../lib64/alt m64 !m32 !mno-app-regs mcmodel=medany;",
 122 #
 123 # The effect is that `gcc -mno-app-regs' (for example) will append "alt"
 124 # to the directory name when searching for libraries or startup files and
 125 # `gcc -m32 -mcmodel=medany' (for example) will append "32/alt". Also note
 126 # that exclusion above is moot, unless the compiler had a default of -m32,
 127 # which would mean that all of the "alt" directories (not the 64/alt ones)
 128 # would be ignored (not generated, nor used) since the exclusion also
 129 # matches the multilib_default args.
 130
 131 # Copy the positional parameters into variables.
 132 options=$1
 133 dirnames=$2
 134 matches=$3
 135 exceptions=$4
 136 extra=$5
 137 exclusions=$6
 138 osdirnames=$7
 139 multilib_required=$8
 140 multiarch=$9
 141 multilib_reuse=${10}
 142 enable_multilib=${11}
 143
 144 echo "static const char *const multilib_raw[] = {"
 145
 146 mkdir tmpmultilib.$$ || exit 1
 147 # Use cd ./foo to avoid CDPATH output.
 148 cd ./tmpmultilib.$$ || exit 1
 149
 150 # What we want to do is select all combinations of the sets in
 151 # options.  Each combination which includes a set of mutually
 152 # exclusive options must then be output multiple times, once for each
 153 # item in the set.  Selecting combinations is a recursive process.
 154 # Since not all versions of sh support functions, we achieve recursion
 155 # by creating a temporary shell script which invokes itself.
 156 rm -f tmpmultilib
 157 cat >tmpmultilib <<\EOF
 158 #!/bin/sh
 159 # This recursive script basically outputs all combinations of its
 160 # input arguments, handling mutually exclusive sets of options by
 161 # repetition.  When the script is called, ${initial} is the list of
 162 # options which should appear before all combinations this will
 163 # output.  The output looks like a list of subdirectory names with
 164 # leading and trailing slashes.
 165 if [ "$#" != "0" ]; then
 166   first=$1
 167   shift
 168   case "$first" in
 169   *\|*)
 170     all=${initial}`echo $first | sed -e 's_|_/_'g`
 171     first=`echo $first | sed -e 's_|_ _'g`
 172     echo ${all}/
 173     initial="${initial}${all}/" ./tmpmultilib $@
 174     ./tmpmultilib $first $@ | grep -v "^${all}"
 175     ;;
 176   *)
 177     for opt in `echo $first | sed -e 's|/| |'g`; do
 178       echo ${initial}${opt}/
 179     done
 180     ./tmpmultilib $@
 181     for opt in `echo $first | sed -e 's|/| |'g`; do
 182       initial="${initial}${opt}/" ./tmpmultilib $@
 183     done
 184   esac
 185 fi
 186 EOF
 187 chmod +x tmpmultilib
 188
 189 combinations=`initial=/ ./tmpmultilib ${options}`
 190
 191 # If there exceptions, weed them out now
 192 if [ -n "${exceptions}" ]; then
 193   cat >tmpmultilib2 <<\EOF
 194 #!/bin/sh
 195 # This recursive script weeds out any combination of multilib
 196 # switches that should not be generated.  The output looks like
 197 # a list of subdirectory names with leading and trailing slashes.
 198
 199   for opt in $@; do
 200     case "$opt" in
 201 EOF
 202
 203   for except in ${exceptions}; do
 204     echo "      /${except}/) : ;;" >> tmpmultilib2
 205   done
 206
 207 cat >>tmpmultilib2 <<\EOF
 208       *) echo ${opt};;
 209     esac
 210   done
 211 EOF
 212   chmod +x tmpmultilib2
 213   combinations=`./tmpmultilib2 ${combinations}`
 214 fi
 215
 216 # If the MULTILIB_REQUIRED list are provided,
 217 # filter out combinations not in this list.
 218 if [ -n "${multilib_required}" ]; then
 219   cat >tmpmultilib2 <<\EOF
 220 #!/bin/sh
 221 # This recursive script weeds out any combination of multilib
 222 # switches that not in the expected list.
 223
 224   for opt in $@; do
 225     case "$opt" in
 226 EOF
 227
 228   for expect in ${multilib_required}; do
 229     echo "      /${expect}/) echo \${opt};;" >> tmpmultilib2
 230   done
 231
 232 cat >>tmpmultilib2 <<\EOF
 233       *) ;;
 234     esac
 235   done
 236 EOF
 237
 238    chmod +x tmpmultilib2
 239    combinations=`./tmpmultilib2 ${combinations}`
 240
 241 fi
 242
 243 # Construct a sed pattern which will convert option names to directory
 244 # names.
 245 todirnames=
 246 if [ -n "${dirnames}" ]; then
 247   set x ${dirnames}
 248   shift
 249   for set in ${options}; do
 250     for opts in `echo ${set} | sed -e 's|/| |'g`; do
 251       patt="/"
 252       for opt in `echo ${opts} | sed -e 's_|_ _'g`; do
 253         if [ "$1" != "${opt}" ]; then
 254           todirnames="${todirnames} -e s|/${opt}/|/${1}/|g"
 255           patt="${patt}${1}/"
 256           if [ "${patt}" != "/${1}/" ]; then
 257             todirnames="${todirnames} -e s|${patt}|/${1}/|g"
 258           fi
 259         fi
 260       done
 261       shift
 262     done
 263   done
 264 fi
 265
 266 # Construct a sed pattern which will convert option names to OS directory
 267 # names.
 268 toosdirnames=
 269 defaultosdirname=
 270 defaultosdirname2=
 271 if [ -n "${multiarch}" ]; then
 272   defaultosdirname=::${multiarch}
 273 fi
 274 if [ -n "${osdirnames}" ]; then
 275   set x ${osdirnames}
 276   shift
 277   while [ $# != 0 ] ; do
 278     case "$1" in
 279       .=*)
 280         defaultosdirname=`echo $1 | sed 's|^.=|:|'`
 281         if [ -n "${multiarch}" ]; then
 282           defaultosdirname=${defaultosdirname}:${multiarch}
 283         fi
 284         case "$defaultosdirname" in
 285           ::*) ;;
 286           *)
 287             defaultosdirname2=${defaultosdirname}
 288             defaultosdirname=
 289             ;;
 290         esac
 291         shift
 292         ;;
 293       *=*)
 294         patt=`echo $1 | sed -e 's|=|/$=/|'`
 295         toosdirnames="${toosdirnames} -e s=^/${patt}/="
 296         shift
 297         ;;
 298       *)
 299         break
 300         ;;
 301     esac
 302   done
 303
 304   if [ $# != 0 ]; then
 305     for set in ${options}; do
 306       for opts in `echo ${set} | sed -e 's|/| |'g`; do
 307         patt="/"
 308         for opt in `echo ${opts} | sed -e 's_|_ _'g`; do
 309           if [ "$1" != "${opt}" ]; then
 310             toosdirnames="${toosdirnames} -e s|/${opt}/|/${1}/|g"
 311             patt="${patt}${1}/"
 312             if [ "${patt}" != "/${1}/" ]; then
 313               toosdirnames="${toosdirnames} -e s|${patt}|/${1}/|g"
 314             fi
 315           fi
 316         done
 317         shift
 318       done
 319     done
 320   fi
 321 fi
 322
 323 # We need another recursive shell script to correctly handle positive
 324 # matches.  If we are invoked as
 325 #   genmultilib "opt1 opt2" "" "opt1=nopt1 opt2=nopt2"
 326 # we must output
 327 #   opt1/opt2 opt1 opt2
 328 #   opt1/opt2 nopt1 opt2
 329 #   opt1/opt2 opt1 nopt2
 330 #   opt1/opt2 nopt1 nopt2
 331 # In other words, we must output all combinations of matches.
 332 rm -f tmpmultilib2
 333 cat >tmpmultilib2 <<\EOF
 334 #!/bin/sh
 335 # The positional parameters are a list of matches to consider.
 336 # ${dirout} is the directory name and ${optout} is the current list of
 337 # options.
 338 if [ "$#" = "0" ]; then
 339   echo "\"${dirout} ${optout};\","
 340 else
 341   first=$1
 342   shift
 343   dirout="${dirout}" optout="${optout}" ./tmpmultilib2 $@
 344   l=`echo ${first} | sed -e 's/=.*$//' -e 's/?/=/g'`
 345   r=`echo ${first} | sed -e 's/^.*=//' -e 's/?/=/g'`
 346   if expr " ${optout} " : ".* ${l} .*" > /dev/null; then
 347     newopt=`echo " ${optout} " | sed -e "s/ ${l} / ${r} /" -e 's/^ //' -e 's/ $//'`
 348     dirout="${dirout}" optout="${newopt}" ./tmpmultilib2 $@
 349   fi
 350 fi
 351 EOF
 352 chmod +x tmpmultilib2
 353
 354 # Start with the current directory, which includes only negations.
 355 optout=
 356 for set in ${options}; do
 357   for opt in `echo ${set} | sed -e 's_[/|]_ _g'`; do
 358     optout="${optout} !${opt}"
 359   done
 360 done
 361 optout=`echo ${optout} | sed -e 's/^ //'`
 362 echo "\".${defaultosdirname} ${optout};\","
 363 [ -n "${defaultosdirname2}" ] && echo "\".${defaultosdirname2} ${optout};\","
 364
 365 # This part of code convert an option combination to
 366 # its corresponding directory names.
 367 # The directory names will be deduced from MULTILIB_DIRNAMES,
 368 # MULTILIB_OSDIRNAMES or the option combination itself.
 369 rm -rf tmpmultilib3
 370 cat >tmpmultilib3 <<\EOF
 371 #!/bin/sh
 372
 373 dirout=
 374 combo=$1
 375 todirnames=$2
 376 toosdirnames=$3
 377 enable_multilib=$4
 378
 379 if [ -n "${todirnames}" ]; then
 380   dirout=`echo ${combo} | sed ${todirnames}`
 381 else
 382   dirout=`echo ${combo} | sed -e 's/=/-/g'`
 383 fi
 384 # Remove the leading and trailing slashes.
 385 dirout=`echo ${dirout} | sed -e 's|^/||' -e 's|/*:/*|:|' -e 's|/$||g'`
 386
 387 # Use the OS directory names rather than the option names.
 388 if [ -n "${toosdirnames}" ]; then
 389   osdirout=`echo ${combo} | sed ${toosdirnames}`
 390   # Remove the leading and trailing slashes.
 391   osdirout=`echo ${osdirout} | sed -e 's|^/||' -e 's|/*:/*|:|' -e 's|/$||g'`
 392   if [ "x${enable_multilib}" != xyes ]; then
 393     dirout=".:${osdirout}"
 394     disable_multilib=yes
 395   else
 396     case "${osdirout}" in
 397       !*)
 398         dirout=`echo ${osdirout} | sed 's/^!//'`
 399         ;;
 400        *)
 401         dirout="${dirout}:${osdirout}"
 402         ;;
 403     esac
 404   fi
 405 else
 406   if [ "x${enable_multilib}" != xyes ]; then
 407     # genmultilib with --disable-multilib should be
 408     # called with '' '' '' '' '' '' '' no
 409     # if MULTILIB_OSDIRNAMES is empty.
 410     exit 1
 411   fi
 412 fi
 413 echo "${dirout}"
 414 EOF
 415 chmod +x tmpmultilib3
 416
 417 # Script to look through the options and output each option that is present,
 418 # and negate each option that is not present.
 419 rm -rf tmpmultilib4
 420 cat > tmpmultilib4 <<\EOF
 421 #!/bin/sh
 422
 423 optout=
 424 combo=$1
 425 options=$2
 426
 427 for set in ${options}; do
 428   setopts=`echo ${set} | sed -e 's_[/|]_ _g'`
 429   for opt in ${setopts}; do
 430     if expr "${combo} " : ".*/${opt}/.*" > /dev/null; then
 431       optout="${optout} ${opt}"
 432     else
 433       optout="${optout} !${opt}"
 434     fi
 435   done
 436 done
 437 optout=`echo ${optout} | sed -e 's/^ //'`
 438 echo "${optout}"
 439 EOF
 440 chmod +x tmpmultilib4
 441
 442 # Work over the list of combinations.  We have to translate each one
 443 # to use the directory names rather than the option names, we have to
 444 # include the information in matches, and we have to generate the
 445 # correct list of options and negations.
 446 for combo in ${combinations}; do
 447   # Use the directory names rather than the option names.
 448   dirout=`./tmpmultilib3 "${combo}" "${todirnames}" "${toosdirnames}" "${enable_multilib}"`
 449
 450   # Look through the options.  We must output each option that is
 451   # present, and negate each option that is not present.
 452   optout=`./tmpmultilib4 "${combo}" "${options}"`
 453
 454   # Output the line with all appropriate matches.
 455   dirout="${dirout}" optout="${optout}" ./tmpmultilib2
 456 done
 457
 458 # Terminate the list of string.
 459 echo "NULL"
 460 echo "};"
 461
 462 # Generate a regular expression to validate option combinations.
 463 options_re=
 464 for set in ${options}; do
 465   for opt in `echo ${set} | sed -e 's_[/|]_ _g' -e 's/+/./g' `; do
 466     options_re="${options_re}${options_re:+|}${opt}"
 467   done
 468 done
 469 options_re="^/((${options_re})/)*\$"
 470
 471 # Output rules used for multilib reuse.
 472 echo ""
 473 echo "static const char *const multilib_reuse_raw[] = {"
 474 for rrule in ${multilib_reuse}; do
 475   # The left part of the rule are the options we used to build multilib.
 476   # The right part of the rule are the options that can reuse this multilib.
 477   combo=`echo ${rrule} | sed -e 's/=.*$//' -e 's/\([^\\]\)\./\1=/g' -e 's/\\\././g'`
 478   copts=`echo ${rrule} | sed -e 's/^.*=//' -e 's/\([^\\]\)\./\1=/g' -e 's/\\\././g'`
 479   # The variable ${combinations} are the option combinations we will build
 480   # multilib from.  If the combination in the left part of reuse rule isn't
 481   # in this variable, it means no multilib will be built for current reuse
 482   # rule.  Thus the reuse purpose specified by current rule is meaningless.
 483   if expr "${combinations} " : ".*/${combo}/.*" > /dev/null; then
 484     if echo "/${copts}/" | grep -E "${options_re}" > /dev/null; then
 485       combo="/${combo}/"
 486       dirout=`./tmpmultilib3 "${combo}" "${todirnames}" "${toosdirnames}" "${enable_multilib}"`
 487       copts="/${copts}/"
 488       optout=`./tmpmultilib4 "${copts}" "${options}"`
 489       # Output the line with all appropriate matches.
 490       dirout="${dirout}" optout="${optout}" ./tmpmultilib2
 491     else
 492       echo "The rule ${rrule} contains an option absent from MULTILIB_OPTIONS." >&2
 493       exit 1
 494     fi
 495   else
 496     echo "The rule ${rrule} is trying to reuse nonexistent multilib." >&2
 497     exit 1
 498   fi
 499 done
 500
 501 # Terminate the list of string.
 502 echo "NULL"
 503 echo "};"
 504
 505 # Output all of the matches now as option and that is the same as that, with
 506 # a semicolon trailer.  Include all of the normal options as well.
 507 # Note, the format of the matches is reversed compared
 508 # to what we want, so switch them around.
 509 echo ""
 510 echo "static const char *const multilib_matches_raw[] = {"
 511 for match in ${matches}; do
 512   l=`echo ${match} | sed -e 's/=.*$//' -e 's/?/=/g'`
 513   r=`echo ${match} | sed -e 's/^.*=//' -e 's/?/=/g'`
 514   echo "\"${r} ${l};\","
 515 done
 516 for set in ${options}; do
 517   for opt in `echo ${set} | sed -e 's_[/|]_ _'g`; do
 518     echo "\"${opt} ${opt};\","
 519   done
 520 done
 521 echo "NULL"
 522 echo "};"
 523
 524 # Output the default options now
 525 echo ""
 526 echo "static const char *multilib_extra = \"${extra}\";"
 527
 528 # Output the exclusion rules now
 529 echo ""
 530 echo "static const char *const multilib_exclusions_raw[] = {"
 531 for rule in ${exclusions}; do
 532   s=`echo ${rule} | sed -e 's,/, ,g'`
 533   echo "\"${s};\","
 534 done
 535 echo "NULL"
 536 echo "};"
 537
 538 # Output the options now
 539 moptions=`echo ${options} | sed -e 's,[         ][      ]*, ,g'`
 540 echo ""
 541 echo "static const char *multilib_options = \"${moptions}\";"
 542
 543 # Finally output the disable flag if specified
 544 if [ "x${disable_multilib}" = xyes ]; then
 545   echo ""
 546   echo "#define DISABLE_MULTILIB  1"
 547 fi
 548
 549 cd ..
 550 rm -r tmpmultilib.$$
 551
 552 exit 0