scripts/ext-toolchain.sh

   1 #!/usr/bin/env bash
   2 #
   3 #   Script for various external toolchain tasks, refer to
   4 #   the --help output for more information.
   5 #
   6 #   Copyright (C) 2012 Jo-Philipp Wich <jo@mein.io>
   7 #
   8 #   This program is free software; you can redistribute it and/or modify
   9 #   it under the terms of the GNU General Public License as published by
  10 #   the Free Software Foundation; either version 2 of the License, or
  11 #   (at your option) any later version.
  12 #
  13 #   This program is distributed in the hope that it will be useful,
  14 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 #   GNU General Public License for more details.
  17 #
  18 #   You should have received a copy of the GNU General Public License
  19 #   along with this program; if not, write to the Free Software
  20 #   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21
  22 CC=""
  23 CXX=""
  24 CPP=""
  25
  26 CFLAGS=""
  27 TOOLCHAIN="."
  28
  29 LIBC_TYPE=""
  30 GCC_VERSION=""
  31
  32
  33 # Library specs
  34 LIB_SPECS="
  35         c:        ld-* lib{anl,c,cidn,crypt,dl,m,nsl,nss_dns,nss_files,resolv,util}
  36         rt:       librt-* librt
  37         pthread:  libpthread-* libpthread
  38         stdcpp:   libstdc++
  39         thread_db: libthread-db
  40         gcc:      libgcc_s
  41         ssp:      libssp
  42         gfortran: libgfortran
  43         gomp:     libgomp
  44 "
  45
  46 # Binary specs
  47 BIN_SPECS="
  48         ldd:       ldd
  49         ldconfig:  ldconfig
  50         gdb:       gdb
  51         gdbserver: gdbserver
  52 "
  53
  54 OVERWRITE_CONFIG=""
  55
  56 test_c() {
  57         cat <<-EOT | "${CC:-false}" $CFLAGS -o /dev/null -x c - 2>/dev/null
  58                 #include <stdio.h>
  59
  60                 int main(int argc, char **argv)
  61                 {
  62                         printf("Hello, world!\n");
  63                         return 0;
  64                 }
  65         EOT
  66 }
  67
  68 test_cxx() {
  69         cat <<-EOT | "${CXX:-false}" $CFLAGS -o /dev/null -x c++ - 2>/dev/null
  70                 #include <iostream>
  71
  72                 using namespace std;
  73
  74                 int main()
  75                 {
  76                         cout << "Hello, world!" << endl;
  77                         return 0;
  78                 }
  79         EOT
  80 }
  81
  82 test_softfloat() {
  83         cat <<-EOT | "$CC" $CFLAGS -msoft-float -o /dev/null -x c - 2>/dev/null
  84                 int main(int argc, char **argv)
  85                 {
  86                         double a = 0.1;
  87                         double b = 0.2;
  88                         double c = (a + b) / (a * b);
  89                         return 1;
  90                 }
  91         EOT
  92 }
  93
  94 test_uclibc() {
  95         local sysroot="$("$CC" $CFLAGS -print-sysroot 2>/dev/null)"
  96         if [ -d "${sysroot:-$TOOLCHAIN}" ]; then
  97                 local lib
  98                 for lib in "${sysroot:-$TOOLCHAIN}"/{lib,usr/lib,usr/local/lib}/ld*-uClibc*.so*; do
  99                         if [ -f "$lib" ] && [ ! -h "$lib" ]; then
 100                                 return 0
 101                         fi
 102                 done
 103         fi
 104         return 1
 105 }
 106
 107 test_feature() {
 108         local feature="$1"; shift
 109
 110         # find compilers, libc type
 111         probe_cc
 112         probe_cxx
 113         probe_libc
 114
 115         # common toolchain feature tests
 116         case "$feature" in
 117                 c)     test_c;         return $? ;;
 118                 c++)   test_cxx;       return $? ;;
 119                 soft*) test_softfloat; return $? ;;
 120         esac
 121
 122         # assume eglibc/glibc supports all libc features
 123         if [ "$LIBC_TYPE" != "uclibc" ]; then
 124                 return 0
 125         fi
 126
 127         # uclibc feature tests
 128         local inc
 129         local sysroot="$("$CC" "$@" -muclibc -print-sysroot 2>/dev/null)"
 130         for inc in "include" "usr/include" "usr/local/include"; do
 131                 local conf="${sysroot:-$TOOLCHAIN}/$inc/bits/uClibc_config.h"
 132                 if [ -f "$conf" ]; then
 133                         case "$feature" in
 134                                 lfs)     grep -q '__UCLIBC_HAS_LFS__ 1'     "$conf"; return $?;;
 135                                 ipv6)    grep -q '__UCLIBC_HAS_IPV6__ 1'    "$conf"; return $?;;
 136                                 rpc)     grep -q '__UCLIBC_HAS_RPC__ 1'     "$conf"; return $?;;
 137                                 locale)  grep -q '__UCLIBC_HAS_LOCALE__ 1'  "$conf"; return $?;;
 138                                 wchar)   grep -q '__UCLIBC_HAS_WCHAR__ 1'   "$conf"; return $?;;
 139                                 threads) grep -q '__UCLIBC_HAS_THREADS__ 1' "$conf"; return $?;;
 140                         esac
 141                 fi
 142         done
 143
 144         return 1
 145 }
 146
 147
 148 find_libs() {
 149         local spec="$(echo "$LIB_SPECS" | sed -ne "s#^[[:space:]]*$1:##ip")"
 150
 151         if [ -n "$spec" ] && probe_cpp; then
 152                 local libdir libdirs
 153                 for libdir in $(
 154                         "$CPP" $CFLAGS -v -x c /dev/null 2>&1 | \
 155                                 sed -ne 's#:# #g; s#^LIBRARY_PATH=##p'
 156                 ); do
 157                         if [ -d "$libdir" ]; then
 158                                 libdirs="$libdirs $(cd "$libdir"; pwd)/"
 159                         fi
 160                 done
 161
 162                 local pattern
 163                 for pattern in $(eval echo $spec); do
 164                         find $libdirs -name "$pattern.so*" | sort -u
 165                 done
 166
 167                 return 0
 168         fi
 169
 170         return 1
 171 }
 172
 173 find_bins() {
 174         local spec="$(echo "$BIN_SPECS" | sed -ne "s#^[[:space:]]*$1:##ip")"
 175
 176         if [ -n "$spec" ] && probe_cpp; then
 177                 local sysroot="$("$CPP" -print-sysroot)"
 178
 179                 local bindir bindirs
 180                 for bindir in $(
 181                         echo "${sysroot:-$TOOLCHAIN}/bin";
 182                         echo "${sysroot:-$TOOLCHAIN}/usr/bin";
 183                         echo "${sysroot:-$TOOLCHAIN}/usr/local/bin";
 184                         "$CPP" $CFLAGS -v -x c /dev/null 2>&1 | \
 185                                 sed -ne 's#:# #g; s#^COMPILER_PATH=##p'
 186                 ); do
 187                         if [ -d "$bindir" ]; then
 188                                 bindirs="$bindirs $(cd "$bindir"; pwd)/"
 189                         fi
 190                 done
 191
 192                 local pattern
 193                 for pattern in $(eval echo $spec); do
 194                         find $bindirs -name "$pattern" | sort -u
 195                 done
 196
 197                 return 0
 198         fi
 199
 200         return 1
 201 }
 202
 203 find_gcc_version() {
 204         if [ -f $TOOLCHAIN/info.mk ]; then
 205                 GCC_VERSION=$(grep GCC_VERSION $TOOLCHAIN/info.mk | sed 's/GCC_VERSION=//')
 206                 return 0
 207         fi
 208
 209         echo "Warning! Can't find info.mk, trying to detect with alternative way."
 210
 211         # Very fragile detection
 212         GCC_VERSION=$(find $TOOLCHAIN/bin | grep -oE "gcc-[0-9]+\.[0-9]+\.[0-9]+$" | \
 213                 head -1 | sed 's/gcc-//')
 214 }
 215
 216
 217 wrap_bin_cc() {
 218         local out="$1"
 219         local bin="$2"
 220
 221         echo    '#!/bin/sh'                                                > "$out"
 222         echo    'for arg in "$@"; do'                                     >> "$out"
 223         echo    ' case "$arg" in -l*|-L*|-shared|-static)'                >> "$out"
 224         echo -n '  exec "'"$bin"'" '"$CFLAGS"' ${STAGING_DIR:+'           >> "$out"
 225         echo -n '-idirafter "$STAGING_DIR/usr/include" '                  >> "$out"
 226         echo -n '-L "$STAGING_DIR/usr/lib" '                              >> "$out"
 227         echo    '-Wl,-rpath-link,"$STAGING_DIR/usr/lib"} "$@" ;;'         >> "$out"
 228         echo    ' esac'                                                   >> "$out"
 229         echo    'done'                                                    >> "$out"
 230         echo -n 'exec "'"$bin"'" '"$CFLAGS"' ${STAGING_DIR:+'             >> "$out"
 231         echo    '-idirafter "$STAGING_DIR/usr/include"} "$@"'             >> "$out"
 232
 233         chmod +x "$out"
 234 }
 235
 236 wrap_bin_ld() {
 237         local out="$1"
 238         local bin="$2"
 239
 240         echo    '#!/bin/sh'                                                > "$out"
 241         echo -n 'exec "'"$bin"'" ${STAGING_DIR:+'                         >> "$out"
 242         echo -n '-L "$STAGING_DIR/usr/lib" '                              >> "$out"
 243         echo    '-rpath-link "$STAGING_DIR/usr/lib"} "$@"'                >> "$out"
 244
 245         chmod +x "$out"
 246 }
 247
 248 wrap_bin_other() {
 249         local out="$1"
 250         local bin="$2"
 251
 252         echo    '#!/bin/sh'                                                > "$out"
 253         echo    'exec "'"$bin"'" "$@"'                                    >> "$out"
 254
 255         chmod +x "$out"
 256 }
 257
 258 wrap_bins() {
 259         if probe_cc; then
 260                 mkdir -p "$1" || return 1
 261
 262                 local cmd
 263                 for cmd in "${CC%-*}-"*; do
 264                         if [ -x "$cmd" ]; then
 265                                 local out="$1/${cmd##*/}"
 266                                 local bin="$cmd"
 267
 268                                 if [ -x "$out" ] && ! grep -q STAGING_DIR "$out"; then
 269                                         mv "$out" "$out.bin"
 270                                         bin='$(dirname "$0")/'"${out##*/}"'.bin'
 271                                 fi
 272
 273                                 case "${cmd##*/}" in
 274                                         *-*cc|*-*cc-*|*-*++|*-*++-*|*-cpp)
 275                                                 wrap_bin_cc "$out" "$bin"
 276                                         ;;
 277                                         *-ld)
 278                                                 wrap_bin_ld "$out" "$bin"
 279                                         ;;
 280                                         *)
 281                                                 wrap_bin_other "$out" "$bin"
 282                                         ;;
 283                                 esac
 284                         fi
 285                 done
 286
 287                 return 0
 288         fi
 289
 290         return 1
 291 }
 292
 293
 294 print_config() {
 295         local mktarget="$1"
 296         local mksubtarget
 297
 298         local target="$("$CC" $CFLAGS -dumpmachine)"
 299         local version="$("$CC" $CFLAGS -dumpversion)"
 300         local cpuarch="${target%%-*}"
 301
 302         # get CC; strip version; strip gcc and add - suffix
 303         local prefix="${CC##*/}"; prefix="${prefix%-$version}"; prefix="${prefix%-*}-"
 304         local config="${0%/scripts/*}/.config"
 305
 306         # if no target specified, print choice list and exit
 307         if [ -z "$mktarget" ]; then
 308                 # prepare metadata
 309                 if [ ! -f "${0%/scripts/*}/tmp/.targetinfo" ]; then
 310                         "${0%/*}/scripts/config/mconf" prepare-tmpinfo
 311                 fi
 312
 313                 local mktargets=$(
 314                         sed -ne "
 315                                 /^Target: / { h };
 316                                 /^Target-Arch: $cpuarch\$/ { x; s#^Target: ##p }
 317                         " "${0%/scripts/*}/tmp/.targetinfo" | sort -u
 318                 )
 319
 320                 for mktarget in $mktargets; do
 321                         case "$mktarget" in */*)
 322                                 mktargets=$(echo "$mktargets" | sed -e "/^${mktarget%/*}\$/d")
 323                         esac
 324                 done
 325
 326                 if [ -n "$mktargets" ]; then
 327                         echo "Available targets:"                               >&2
 328                         echo $mktargets                                         >&2
 329                 else
 330                         echo -e "Could not find a suitable OpenWrt target for " >&2
 331                         echo -e "CPU architecture '$cpuarch' - you need to "    >&2
 332                         echo -e "define one first!"                             >&2
 333                 fi
 334                 return 1
 335         fi
 336
 337         # bail out if there is a .config already
 338         if [ -f "$config" ]; then
 339                 if [ "$OVERWRITE_CONFIG" == "" ]; then
 340                         echo "There already is a .config file, refusing to overwrite!" >&2
 341                         return 1
 342                 else
 343                         echo "There already is a .config file, trying to overwrite!"
 344                 fi
 345         fi
 346
 347         case "$mktarget" in */*)
 348                 mksubtarget="${mktarget#*/}"
 349                 mktarget="${mktarget%/*}"
 350         ;; esac
 351
 352         if [ ! -f "$config" ]; then
 353                 touch "$config"
 354         fi
 355
 356         echo "CONFIG_TARGET_${mktarget}=y" >> "$config"
 357
 358         if [ -n "$mksubtarget" ]; then
 359                 echo "CONFIG_TARGET_${mktarget}_${mksubtarget}=y" >> "$config"
 360         fi
 361
 362         if test_feature "softfloat"; then
 363                 echo "CONFIG_SOFT_FLOAT=y" >> "$config"
 364         else
 365                 echo "# CONFIG_SOFT_FLOAT is not set" >> "$config"
 366         fi
 367
 368         if test_feature "ipv6"; then
 369                 echo "CONFIG_IPV6=y" >> "$config"
 370         else
 371                 echo "# CONFIG_IPV6 is not set" >> "$config"
 372         fi
 373
 374         if test_feature "locale"; then
 375                 echo "CONFIG_BUILD_NLS=y" >> "$config"
 376         else
 377                 echo "# CONFIG_BUILD_NLS is not set" >> "$config"
 378         fi
 379
 380         echo "CONFIG_DEVEL=y" >> "$config"
 381         echo "CONFIG_EXTERNAL_TOOLCHAIN=y" >> "$config"
 382         echo "CONFIG_TOOLCHAIN_ROOT=\"$TOOLCHAIN\"" >> "$config"
 383         echo "CONFIG_TOOLCHAIN_PREFIX=\"$prefix\"" >> "$config"
 384         echo "CONFIG_TARGET_NAME=\"$target\"" >> "$config"
 385
 386         if [ -f "$config" ]; then
 387                 sed -i '/CONFIG_EXTERNAL_TOOLCHAIN_LIBC_USE_MUSL/d' "$config"
 388                 sed -i '/CONFIG_EXTERNAL_TOOLCHAIN_LIBC_USE_GLIBC/d' "$config"
 389         fi
 390
 391         if [ "$LIBC_TYPE" == glibc ]; then
 392                 echo "CONFIG_EXTERNAL_TOOLCHAIN_LIBC_USE_GLIBC=y" >> "$config"
 393         elif [ "$LIBC_TYPE" == musl ]; then
 394                 echo "CONFIG_EXTERNAL_TOOLCHAIN_LIBC_USE_MUSL=y" >> "$config"
 395         else
 396                 echo "Can't detect LIBC type. Aborting!" >&2
 397                 return 1
 398         fi
 399
 400         if [ -n "$GCC_VERSION" ]; then
 401                 echo "CONFIG_EXTERNAL_GCC_VERSION=\"$GCC_VERSION\"" >> "$config"
 402         else
 403                 echo "Can't detect GCC version. Aborting!" >&2
 404                 return 1
 405         fi
 406
 407         local lib
 408         for lib in C RT PTHREAD GCC STDCPP SSP GFORTRAN GOMP; do
 409                 local file
 410                 local spec=""
 411                 local llib="$(echo "$lib" | sed -e 's#.*#\L&#')"
 412                 for file in $(find_libs "$lib"); do
 413                         spec="${spec:+$spec }$(echo "$file" | sed -e "s#^$TOOLCHAIN#.#")"
 414                 done
 415                 if [ -n "$spec" ]; then
 416                         echo "CONFIG_PACKAGE_lib${llib}=y" >> "$config"
 417                         echo "CONFIG_LIB${lib}_FILE_SPEC=\"$spec\"" >> "$config"
 418                 else
 419                         echo "# CONFIG_PACKAGE_lib${llib} is not set" >> "$config"
 420                 fi
 421         done
 422
 423         local bin
 424         for bin in LDD LDCONFIG; do
 425                 local file
 426                 local spec=""
 427                 local lbin="$(echo "$bin" | sed -e 's#.*#\L&#')"
 428                 for file in $(find_bins "$bin"); do
 429                         spec="${spec:+$spec }$(echo "$file" | sed -e "s#^$TOOLCHAIN#.#")"
 430                 done
 431                 if [ -n "$spec" ]; then
 432                         echo "CONFIG_PACKAGE_${lbin}=y" >> "$config"
 433                         echo "CONFIG_${bin}_FILE_SPEC=\"$spec\"" >> "$config"
 434                 else
 435                         echo "# CONFIG_PACKAGE_${lbin} is not set" >> "$config"
 436                 fi
 437         done
 438
 439         # inflate
 440         make -C "${0%/scripts/*}" defconfig
 441         return 0
 442 }
 443
 444
 445 probe_cc() {
 446         if [ -z "$CC" ]; then
 447                 local bin
 448                 for bin in "bin" "usr/bin" "usr/local/bin"; do
 449                         local cmd
 450                         for cmd in "$TOOLCHAIN/$bin/"*-*cc*; do
 451                                 if [ -x "$cmd" ] && [ ! -h "$cmd" ]; then
 452                                         CC="$(cd "${cmd%/*}"; pwd)/${cmd##*/}"
 453                                         return 0
 454                                 fi
 455                         done
 456                 done
 457                 return 1
 458         fi
 459         return 0
 460 }
 461
 462 probe_cxx() {
 463         if [ -z "$CXX" ]; then
 464                 local bin
 465                 for bin in "bin" "usr/bin" "usr/local/bin"; do
 466                         local cmd
 467                         for cmd in "$TOOLCHAIN/$bin/"*-*++*; do
 468                                 if [ -x "$cmd" ] && [ ! -h "$cmd" ]; then
 469                                         CXX="$(cd "${cmd%/*}"; pwd)/${cmd##*/}"
 470                                         return 0
 471                                 fi
 472                         done
 473                 done
 474                 return 1
 475         fi
 476         return 0
 477 }
 478
 479 probe_cpp() {
 480         if [ -z "$CPP" ]; then
 481                 local bin
 482                 for bin in "bin" "usr/bin" "usr/local/bin"; do
 483                         local cmd
 484                         for cmd in "$TOOLCHAIN/$bin/"*-cpp*; do
 485                                 if [ -x "$cmd" ] && [ ! -h "$cmd" ]; then
 486                                         CPP="$(cd "${cmd%/*}"; pwd)/${cmd##*/}"
 487                                         return 0
 488                                 fi
 489                         done
 490                 done
 491                 return 1
 492         fi
 493         return 0
 494 }
 495
 496 probe_libc() {
 497         if [ -f $TOOLCHAIN/info.mk ]; then
 498                 LIBC_TYPE=$(grep LIBC_TYPE $TOOLCHAIN/info.mk | sed 's/LIBC_TYPE=//')
 499                 return 0
 500         fi
 501
 502         echo "Warning! Can't find info.mk, trying to detect with alternative way."
 503
 504         if [ -z "$LIBC_TYPE" ]; then
 505                 if test_uclibc; then
 506                         LIBC_TYPE="uclibc"
 507                 else
 508                         LIBC_TYPE="glibc"
 509                 fi
 510         fi
 511         return 0
 512 }
 513
 514
 515 while [ -n "$1" ]; do
 516         arg="$1"; shift
 517         case "$arg" in
 518                 --toolchain)
 519                         [ -d "$1" ] || {
 520                                 echo "Toolchain directory '$1' does not exist." >&2
 521                                 exit 1
 522                         }
 523                         TOOLCHAIN="$(cd "$1"; pwd)"; shift
 524                 ;;
 525
 526                 --cflags)
 527                         CFLAGS="${CFLAGS:+$CFLAGS }$1"; shift
 528                 ;;
 529
 530                 --print-libc)
 531                         if probe_cc; then
 532                                 probe_libc
 533                                 echo "$LIBC_TYPE"
 534                                 exit 0
 535                         fi
 536                         echo "No C compiler found in '$TOOLCHAIN'." >&2
 537                         exit 1
 538                 ;;
 539
 540                 --print-target)
 541                         if probe_cc; then
 542                                 exec "$CC" $CFLAGS -dumpmachine
 543                         fi
 544                         echo "No C compiler found in '$TOOLCHAIN'." >&2
 545                         exit 1
 546                 ;;
 547
 548                 --print-bin)
 549                         if [ -z "$1" ]; then
 550                                 echo "Available programs:"                      >&2
 551                                 echo $(echo "$BIN_SPECS" | sed -ne 's#:.*$##p') >&2
 552                                 exit 1
 553                         fi
 554
 555                         find_bins "$1" || exec "$0" --toolchain "$TOOLCHAIN" --print-bin
 556                         exit 0
 557                 ;;
 558
 559                 --print-libs)
 560                         if [ -z "$1" ]; then
 561                                 echo "Available libraries:"                     >&2
 562                                 echo $(echo "$LIB_SPECS" | sed -ne 's#:.*$##p') >&2
 563                                 exit 1
 564                         fi
 565
 566                         find_libs "$1" || exec "$0" --toolchain "$TOOLCHAIN" --print-libs
 567                         exit 0
 568                 ;;
 569
 570                 --test)
 571                         test_feature "$1"
 572                         exit $?
 573                 ;;
 574
 575                 --wrap)
 576                         [ -n "$1" ] || exec "$0" --help
 577                         wrap_bins "$1"
 578                         exit $?
 579                 ;;
 580
 581                 --overwrite-config)
 582                         OVERWRITE_CONFIG=y
 583                 ;;
 584
 585                 --config)
 586                         if probe_cc; then
 587                                 probe_libc
 588                                 find_gcc_version
 589                                 print_config "$1"
 590                                 exit $?
 591                         fi
 592                         echo "No C compiler found in '$TOOLCHAIN'." >&2
 593                         exit 1
 594                 ;;
 595
 596                 -h|--help)
 597                         me="$(basename "$0")"
 598                         echo -e "\nUsage:\n"                                            >&2
 599                         echo -e "  $me --toolchain {directory} --print-libc"            >&2
 600                         echo -e "    Print the libc implementation and exit.\n"         >&2
 601                         echo -e "  $me --toolchain {directory} --print-target"          >&2
 602                         echo -e "    Print the GNU target name and exit.\n"             >&2
 603                         echo -e "  $me --toolchain {directory} --print-bin {program}"   >&2
 604                         echo -e "    Print executables belonging to given program,"     >&2
 605                         echo -e "    omit program argument to get a list of names.\n"   >&2
 606                         echo -e "  $me --toolchain {directory} --print-libs {library}"  >&2
 607                         echo -e "    Print shared objects belonging to given library,"  >&2
 608                         echo -e "    omit library argument to get a list of names.\n"   >&2
 609                         echo -e "  $me --toolchain {directory} --test {feature}"        >&2
 610                         echo -e "    Test given feature, exit code indicates success."  >&2
 611                         echo -e "    Possible features are 'c', 'c++', 'softfloat',"    >&2
 612                         echo -e "    'lfs', 'rpc', 'ipv6', 'wchar', 'locale' and "      >&2
 613                         echo -e "    'threads'.\n"                                      >&2
 614                         echo -e "  $me --toolchain {directory} --wrap {directory}"      >&2
 615                         echo -e "    Create wrapper scripts for C and C++ compiler, "   >&2
 616                         echo -e "    linker, assembler and other key executables in "   >&2
 617                         echo -e "    the directory given with --wrap.\n"                >&2
 618                         echo -e "  $me --toolchain {directory} --config {target}"       >&2
 619                         echo -e "    Analyze the given toolchain and print a suitable"  >&2
 620                         echo -e "    .config for the given target. Omit target "        >&2
 621                         echo -e "    argument to get a list of names.\n"                >&2
 622                         echo -e "  $me --help"                                          >&2
 623                         echo -e "    Display this help text and exit.\n\n"              >&2
 624                         echo -e "  Most commands also take a --cflags parameter which " >&2
 625                         echo -e "  is used to specify C flags to be passed to the "     >&2
 626                         echo -e "  cross compiler when performing tests."               >&2
 627                         echo -e "  This parameter may be repeated multiple times."      >&2
 628                         echo -e "  Use --overwrite-config before --config to overwrite" >&2
 629                         echo -e "  an already present config with the required changes.">&2
 630                         exit 1
 631                 ;;
 632
 633                 *)
 634                         echo "Unknown argument '$arg'" >&2
 635                         exec $0 --help
 636                 ;;
 637         esac
 638 done
 639
 640 exec $0 --help