scripts/build/cc/gcc.sh
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Fri Apr 15 00:05:53 2011 +0200 (2011-04-15)
branch1.11
changeset 2555 cb36b0091671
parent 2554 e378a7ccc345
child 2558 b7317d2fe0e9
permissions -rw-r--r--
cc/gcc: fix passing args with spaces when calling core gcc

Spaces in arguments to the core gcc backend were not handled.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 7cce5c8fc79a62bca1e448fc721e7209ac85d204)
     1 # This file adds the function to build the gcc C compiler
     2 # Copyright 2007 Yann E. MORIN
     3 # Licensed under the GPL v2. See COPYING in the root of this package
     4 
     5 # Download gcc
     6 do_cc_get() {
     7     local linaro_version
     8     local linaro_series
     9     local linaro_base_url="http://launchpad.net/gcc-linaro"
    10 
    11 
    12     # Account for the Linaro versioning
    13     linaro_version="$( echo "${CT_CC_VERSION}"      \
    14                        |sed -r -e 's/^linaro-//;'   \
    15                      )"
    16     linaro_series="$( echo "${linaro_version}"      \
    17                       |sed -r -e 's/-.*//;'         \
    18                     )"
    19 
    20     # Ah! gcc folks are kind of 'different': they store the tarballs in
    21     # subdirectories of the same name! That's because gcc is such /crap/ that
    22     # it is such /big/ that it needs being splitted for distribution! Sad. :-(
    23     # Arrgghh! Some of those versions does not follow this convention:
    24     # gcc-3.3.3 lives in releases/gcc-3.3.3, while gcc-2.95.* isn't in a
    25     # subdirectory! You bastard!
    26     CT_GetFile "gcc-${CT_CC_VERSION}"                                                       \
    27                {ftp,http}://ftp.gnu.org/gnu/gcc{,{,/releases}/gcc-${CT_CC_VERSION}}         \
    28                ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/releases/gcc-${CT_CC_VERSION} \
    29                ftp://ftp.uvsq.fr/pub/gcc/snapshots/${CT_CC_VERSION}                         \
    30                "${linaro_base_url}/${linaro_series}/${linaro_version}/+download"
    31 
    32     # Starting with GCC 4.3, ecj is used for Java, and will only be
    33     # built if the configure script finds ecj.jar at the top of the
    34     # GCC source tree, which will not be there unless we get it and
    35     # put it there ourselves
    36     if [ "${CT_CC_LANG_JAVA_USE_ECJ}" = "y" ]; then
    37         CT_GetFile ecj-latest .jar ftp://gcc.gnu.org/pub/java   \
    38                                    ftp://sourceware.org/pub/java
    39     fi
    40 }
    41 
    42 # Extract gcc
    43 do_cc_extract() {
    44     CT_Extract "gcc-${CT_CC_VERSION}"
    45     CT_Patch "gcc" "${CT_CC_VERSION}"
    46 
    47     # Copy ecj-latest.jar to ecj.jar at the top of the GCC source tree
    48     if [ "${CT_CC_LANG_JAVA_USE_ECJ}" = "y"                     \
    49          -a ! -f "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/ecj.jar"   \
    50        ]; then
    51         CT_DoExecLog ALL cp -v "${CT_TARBALLS_DIR}/ecj-latest.jar" "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/ecj.jar"
    52     fi
    53 }
    54 
    55 #------------------------------------------------------------------------------
    56 # Core gcc pass 1
    57 do_cc_core_pass_1() {
    58     # If we're building for bare metal, build the static core gcc,
    59     # with libgcc.
    60     # In case we're not bare metal and building a canadian compiler, do nothing
    61     # In case we're not bare metal, and we're NPTL, build the static core gcc.
    62     # In any other case, do nothing.
    63     case "${CT_BARE_METAL},${CT_CANADIAN},${CT_THREADS}" in
    64         y,*,*)  do_cc_core mode=static;;
    65         ,y,*)   ;;
    66         ,,nptl) do_cc_core mode=static;;
    67         *)      ;;
    68     esac
    69 }
    70 
    71 # Core gcc pass 2
    72 do_cc_core_pass_2() {
    73     # In case we're building for bare metal, do nothing, we already have
    74     # our compiler.
    75     # In case we're not bare metal and building a canadian compiler, do nothing
    76     # In case we're NPTL, build the shared core gcc and the target libgcc.
    77     # In any other case, build the static core gcc and, if using gcc-4.3+,
    78     # also build the target libgcc.
    79     case "${CT_BARE_METAL},${CT_CANADIAN},${CT_THREADS}" in
    80         y,*,*)
    81             if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
    82                 do_cc_core mode=baremetal build_libgcc=yes build_libstdcxx=yes build_staticlinked=yes
    83             else
    84                 do_cc_core mode=baremetal build_libgcc=yes build_libstdcxx=yes
    85             fi
    86             ;;
    87         ,y,*)   ;;
    88         ,,nptl)
    89             do_cc_core mode=shared build_libgcc=yes
    90             ;;
    91         ,,win32)
    92             do_cc_core mode=static build_libgcc=yes
    93             ;;
    94         *)  if [ "${CT_CC_GCC_4_3_or_later}" = "y" ]; then
    95                 do_cc_core mode=static build_libgcc=yes
    96             else
    97                 do_cc_core mode=static
    98             fi
    99             ;;
   100     esac
   101 }
   102 
   103 #------------------------------------------------------------------------------
   104 # Build core gcc
   105 # This function is used to build both the static and the shared core C conpiler,
   106 # with or without the target libgcc. We need to know wether:
   107 #  - we're building static, shared or bare metal: mode=[static|shared|baremetal]
   108 #  - we need to build libgcc or not             : build_libgcc=[yes|no]       (default: no)
   109 #  - we need to build libstdc++ or not          : build_libstdcxx=[yes|no]    (default: no)
   110 #  - we need to build statically linked or not  : build_staticlinked=[yes|no] (default: no)
   111 # Usage: do_cc_core mode=[static|shared|baremetal] build_libgcc=[yes|no] build_staticlinked=[yes|no]
   112 do_cc_core() {
   113     local mode
   114     local build_libgcc=no
   115     local build_libstdcxx=no
   116     local build_staticlinked=no
   117     local core_prefix_dir
   118     local lang_opt
   119     local tmp
   120     local -a host_libstdcxx_flags
   121     local -a extra_config
   122     local -a core_LDFLAGS
   123     local -a core_targets
   124 
   125     while [ $# -ne 0 ]; do
   126         eval "${1// /\\ }"
   127         shift
   128     done
   129 
   130     lang_opt=c
   131     case "${mode}" in
   132         static)
   133             core_prefix_dir="${CT_CC_CORE_STATIC_PREFIX_DIR}"
   134             extra_config+=("--with-newlib")
   135             extra_config+=("--enable-threads=no")
   136             extra_config+=("--disable-shared")
   137             copy_headers=y  # For baremetal, as there's no headers to copy,
   138                             # we copy an empty directory. So, who cares?
   139             ;;
   140         shared)
   141             core_prefix_dir="${CT_CC_CORE_SHARED_PREFIX_DIR}"
   142             extra_config+=("--enable-shared")
   143             copy_headers=y
   144             ;;
   145         baremetal)
   146             core_prefix_dir="${CT_PREFIX_DIR}"
   147             extra_config+=("--with-newlib")
   148             extra_config+=("--enable-threads=no")
   149             extra_config+=("--disable-shared")
   150             [ "${CT_CC_LANG_CXX}" = "y" ] && lang_opt="${lang_opt},c++"
   151             copy_headers=n
   152             ;;
   153         *)
   154             CT_Abort "Internal Error: 'mode' must be one of: 'static', 'shared' or 'baremetal', not '${mode:-(empty)}'"
   155             ;;
   156     esac
   157 
   158     CT_DoStep INFO "Installing ${mode} core C compiler"
   159     mkdir -p "${CT_BUILD_DIR}/build-cc-core-${mode}"
   160     cd "${CT_BUILD_DIR}/build-cc-core-${mode}"
   161 
   162     # Bare metal delivers the core compiler as final compiler, so add version info and bugurl
   163     [ -n "${CT_CC_BUGURL}" ]     && extra_config+=("--with-bugurl=${CT_CC_BUGURL}")
   164     [ -n "${CT_CC_PKGVERSION}" ] && extra_config+=("--with-pkgversion=${CT_CC_PKGVERSION}")
   165 
   166     if [ "${copy_headers}" = "y" ]; then
   167         CT_DoLog DEBUG "Copying headers to install area of bootstrap gcc, so it can build libgcc2"
   168         CT_DoExecLog ALL cp -a "${CT_HEADERS_DIR}" "${core_prefix_dir}/${CT_TARGET}/include"
   169     fi
   170 
   171     CT_DoLog EXTRA "Configuring ${mode} core C compiler"
   172 
   173     for tmp in ARCH ABI CPU TUNE FPU FLOAT; do
   174         eval tmp="\${CT_ARCH_WITH_${tmp}}"
   175         if [ -n "${tmp}" ]; then
   176             extra_config+=("${tmp}")
   177         fi
   178     done
   179     if [ "${CT_CC_CXA_ATEXIT}" = "y" ]; then
   180         extra_config+=("--enable-__cxa_atexit")
   181     else
   182         extra_config+=("--disable-__cxa_atexit")
   183     fi
   184 
   185     # *** WARNING ! ***
   186     # Keep this full if-else-if-elif-fi-fi block in sync
   187     # with the same block in do_cc, below.
   188     if [ "${build_staticlinked}" = "yes" ]; then
   189         core_LDFLAGS+=("-static")
   190         host_libstdcxx_flags+=("-static-libgcc")
   191         host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")
   192         host_libstdcxx_flags+=("-lm")
   193         # Companion libraries are build static (eg !shared), so
   194         # the libstdc++ is not pulled automatically, although it
   195         # is needed. Shoe-horn it in our LDFLAGS
   196         # Ditto libm on some Fedora boxen
   197         core_LDFLAGS+=("-lstdc++")
   198         core_LDFLAGS+=("-lm")
   199     else
   200         if [ "${CT_CC_STATIC_LIBSTDCXX}" = "y" ]; then
   201             # this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2
   202             # build script
   203             # FIXME: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,
   204             # see http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01635.html
   205             host_libstdcxx_flags+=("-static-libgcc")
   206             host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++,-Bdynamic")
   207             host_libstdcxx_flags+=("-lm")
   208         elif [ "${CT_COMPLIBS_SHARED}" != "y" ]; then
   209             # When companion libraries are build static (eg !shared),
   210             # the libstdc++ is not pulled automatically, although it
   211             # is needed. Shoe-horn it in our LDFLAGS
   212             # Ditto libm on some Fedora boxen
   213             core_LDFLAGS+=("-lstdc++")
   214             core_LDFLAGS+=("-lm")
   215         fi
   216     fi
   217 
   218     if [ "${CT_CC_GCC_USE_GMP_MPFR}" = "y" ]; then
   219         extra_config+=("--with-gmp=${CT_COMPLIBS_DIR}")
   220         extra_config+=("--with-mpfr=${CT_COMPLIBS_DIR}")
   221     fi
   222     if [ "${CT_CC_GCC_USE_MPC}" = "y" ]; then
   223         extra_config+=("--with-mpc=${CT_COMPLIBS_DIR}")
   224     fi
   225     if [ "${CT_CC_GCC_USE_GRAPHITE}" = "y" ]; then
   226         extra_config+=("--with-ppl=${CT_COMPLIBS_DIR}")
   227         # With PPL 0.11+, also pull libpwl if needed
   228         if [ "${CT_PPL_NEEDS_LIBPWL}" = "y" ]; then
   229             host_libstdcxx_flags+=("-L${CT_COMPLIBS_DIR}/lib")
   230             host_libstdcxx_flags+=("-lpwl")
   231         fi
   232         extra_config+=("--with-cloog=${CT_COMPLIBS_DIR}")
   233     elif [ "${CT_CC_GCC_HAS_GRAPHITE}" = "y" ]; then
   234         extra_config+=("--with-ppl=no")
   235         extra_config+=("--with-cloog=no")
   236     fi
   237     if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then
   238         extra_config+=("--with-libelf=${CT_COMPLIBS_DIR}")
   239         extra_config+=("--enable-lto")
   240     elif [ "${CT_CC_GCC_HAS_LTO}" = "y" ]; then
   241         extra_config+=("--with-libelf=no")
   242         extra_config+=("--disable-lto")
   243     fi
   244 
   245     if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then
   246         extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")
   247     fi
   248 
   249     if [ "${CT_CC_GCC_ENABLE_TARGET_OPTSPACE}" = "y" ]; then
   250         extra_config+=("--enable-target-optspace")
   251     fi
   252 
   253     case "${CT_CC_GCC_LDBL_128}" in
   254         y)  extra_config+=("--with-long-double-128");;
   255         m)  ;;
   256         "") extra_config+=("--without-long-double-128");;
   257     esac
   258 
   259     CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
   260 
   261     # Use --with-local-prefix so older gccs don't look in /usr/local (http://gcc.gnu.org/PR10532)
   262     CT_DoExecLog CFG                                \
   263     CC_FOR_BUILD="${CT_BUILD}-gcc"                  \
   264     CFLAGS="${CT_CFLAGS_FOR_HOST}"                  \
   265     LDFLAGS="${core_LDFLAGS[*]}"                    \
   266     "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/configure"  \
   267         --build=${CT_BUILD}                         \
   268         --host=${CT_HOST}                           \
   269         --target=${CT_TARGET}                       \
   270         --prefix="${core_prefix_dir}"               \
   271         --with-local-prefix="${CT_SYSROOT_DIR}"     \
   272         --disable-multilib                          \
   273         --disable-libmudflap                        \
   274         ${CC_CORE_SYSROOT_ARG}                      \
   275         "${extra_config[@]}"                        \
   276         --disable-nls                               \
   277         --enable-languages="${lang_opt}"            \
   278         ${CT_CC_CORE_EXTRA_CONFIG}
   279 
   280     if [ "${build_libgcc}" = "yes" ]; then
   281         # HACK: we need to override SHLIB_LC from gcc/config/t-slibgcc-elf-ver or
   282         # gcc/config/t-libunwind so -lc is removed from the link for
   283         # libgcc_s.so, as we do not have a target -lc yet.
   284         # This is not as ugly as it appears to be ;-) All symbols get resolved
   285         # during the glibc build, and we provide a proper libgcc_s.so for the
   286         # cross toolchain during the final gcc build.
   287         #
   288         # As we cannot modify the source tree, nor override SHLIB_LC itself
   289         # during configure or make, we have to edit the resultant
   290         # gcc/libgcc.mk itself to remove -lc from the link.
   291         # This causes us to have to jump through some hoops...
   292         #
   293         # To produce libgcc.mk to edit we firstly require libiberty.a,
   294         # so we configure then build it.
   295         # Next we have to configure gcc, create libgcc.mk then edit it...
   296         # So much easier if we just edit the source tree, but hey...
   297         if [ ! -f "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/gcc/BASE-VER" ]; then
   298             CT_DoExecLog CFG make configure-libiberty
   299             CT_DoExecLog ALL make ${JOBSFLAGS} -C libiberty libiberty.a
   300             CT_DoExecLog CFG make configure-gcc configure-libcpp
   301             CT_DoExecLog ALL make ${JOBSFLAGS} all-libcpp
   302         else
   303             CT_DoExecLog CFG make configure-gcc configure-libcpp configure-build-libiberty
   304             CT_DoExecLog ALL make ${JOBSFLAGS} all-libcpp all-build-libiberty
   305         fi
   306         # HACK: gcc-4.2 uses libdecnumber to build libgcc.mk, so build it here.
   307         if [ -d "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/libdecnumber" ]; then
   308             CT_DoExecLog CFG make configure-libdecnumber
   309             CT_DoExecLog ALL make ${JOBSFLAGS} -C libdecnumber libdecnumber.a
   310         fi
   311 
   312         # Starting with GCC 4.3, libgcc.mk is no longer built,
   313         # and libgcc.mvars is used instead.
   314 
   315         if [ "${CT_CC_GCC_4_3_or_later}" = "y" ]; then
   316             libgcc_rule="libgcc.mvars"
   317             core_targets=( gcc target-libgcc )
   318         else
   319             libgcc_rule="libgcc.mk"
   320             core_targets=( gcc )
   321         fi
   322 
   323         # On bare metal and canadian build the host-compiler is used when
   324         # actually the build-system compiler is required. Choose the correct
   325         # compilers for canadian build and use the defaults on other
   326         # configurations.
   327         if [ "${CT_BARE_METAL},${CT_CANADIAN}" = "y,y" ]; then
   328             repair_cc="CC_FOR_BUILD=${CT_BUILD}-gcc \
   329                        GCC_FOR_TARGET=${CT_TARGET}-gcc"
   330         else
   331             repair_cc=""
   332         fi
   333 
   334         CT_DoExecLog ALL make ${JOBSFLAGS} -C gcc ${libgcc_rule} \
   335                               ${repair_cc}
   336         sed -r -i -e 's@-lc@@g' gcc/${libgcc_rule}
   337     else # build_libgcc
   338         core_targets=( gcc )
   339     fi   # ! build libgcc
   340     if [    "${build_libstdcxx}" = "yes"    \
   341          -a "${CT_CC_LANG_CXX}"  = "y"      \
   342        ]; then
   343         core_targets+=( target-libstdc++-v3 )
   344     fi
   345 
   346     CT_DoLog EXTRA "Building ${mode} core C compiler"
   347     CT_DoExecLog ALL make ${JOBSFLAGS} "${core_targets[@]/#/all-}"
   348 
   349     CT_DoLog EXTRA "Installing ${mode} core C compiler"
   350     CT_DoExecLog ALL make "${core_targets[@]/#/install-}"
   351 
   352     # Create a symlink ${CT_TARGET}-cc to ${CT_TARGET}-gcc to always be able
   353     # to call the C compiler with the same, somewhat canonical name.
   354     # check whether compiler has an extension
   355     file="$( ls -1 "${core_prefix_dir}/bin/${CT_TARGET}-gcc."* 2>/dev/null || true )"
   356     [ -z "${file}" ] || ext=".${file##*.}"
   357     CT_DoExecLog ALL ln -sv "${CT_TARGET}-gcc${ext}" "${core_prefix_dir}/bin/${CT_TARGET}-cc${ext}"
   358 
   359     CT_EndStep
   360 }
   361 
   362 #------------------------------------------------------------------------------
   363 # Build final gcc
   364 do_cc() {
   365     local -a host_libstdcxx_flags
   366     local -a extra_config
   367     local -a final_LDFLAGS
   368     local tmp
   369 
   370     # If building for bare metal, nothing to be done here, the static core conpiler is enough!
   371     [ "${CT_BARE_METAL}" = "y" ] && return 0
   372 
   373     CT_DoStep INFO "Installing final compiler"
   374 
   375     mkdir -p "${CT_BUILD_DIR}/build-cc"
   376     cd "${CT_BUILD_DIR}/build-cc"
   377 
   378     CT_DoLog EXTRA "Configuring final compiler"
   379 
   380     # Enable selected languages
   381     lang_opt="c"
   382     [ "${CT_CC_LANG_CXX}" = "y"      ] && lang_opt="${lang_opt},c++"
   383     [ "${CT_CC_LANG_FORTRAN}" = "y"  ] && lang_opt="${lang_opt},fortran"
   384     [ "${CT_CC_LANG_ADA}" = "y"      ] && lang_opt="${lang_opt},ada"
   385     [ "${CT_CC_LANG_JAVA}" = "y"     ] && lang_opt="${lang_opt},java"
   386     [ "${CT_CC_LANG_OBJC}" = "y"     ] && lang_opt="${lang_opt},objc"
   387     [ "${CT_CC_LANG_OBJCXX}" = "y"   ] && lang_opt="${lang_opt},obj-c++"
   388     CT_Test "Building ADA language is not yet supported. Will try..." "${CT_CC_LANG_ADA}" = "y"
   389     CT_Test "Building Objective-C language is not yet supported. Will try..." "${CT_CC_LANG_OBJC}" = "y"
   390     CT_Test "Building Objective-C++ language is not yet supported. Will try..." "${CT_CC_LANG_OBJCXX}" = "y"
   391     CT_Test "Building ${CT_CC_LANG_OTHERS//,/ } language(s) is not yet supported. Will try..." -n "${CT_CC_LANG_OTHERS}"
   392     lang_opt=$(echo "${lang_opt},${CT_CC_LANG_OTHERS}" |sed -r -e 's/,+/,/g; s/,*$//;')
   393 
   394     extra_config+=("--enable-languages=${lang_opt}")
   395     extra_config+=("--disable-multilib")
   396     for tmp in ARCH ABI CPU TUNE FPU FLOAT; do
   397         eval tmp="\${CT_ARCH_WITH_${tmp}}"
   398         if [ -n "${tmp}" ]; then
   399             extra_config+=("${tmp}")
   400         fi
   401     done
   402 
   403     [ "${CT_SHARED_LIBS}" = "y" ]                   || extra_config+=("--disable-shared")
   404     [ -n "${CT_CC_PKGVERSION}" ]                    && extra_config+=("--with-pkgversion=${CT_CC_PKGVERSION}")
   405     [ -n "${CT_CC_BUGURL}" ]                        && extra_config+=("--with-bugurl=${CT_CC_BUGURL}")
   406     case "${CT_CC_GCC_SJLJ_EXCEPTIONS}" in
   407         y)  extra_config+=("--enable-sjlj-exceptions");;
   408         m)  ;;
   409         "") extra_config+=("--disable-sjlj-exceptions");;
   410     esac
   411     if [ "${CT_CC_CXA_ATEXIT}" = "y" ]; then
   412         extra_config+=("--enable-__cxa_atexit")
   413     else
   414         extra_config+=("--disable-__cxa_atexit")
   415     fi
   416     if [ -n "${CC_ENABLE_CXX_FLAGS}" ]; then
   417         extra_config+=("--enable-cxx-flags=${CC_ENABLE_CXX_FLAGS}")
   418     fi
   419     if [ "${CT_CC_GCC_LIBMUDFLAP}" = "y" ]; then
   420         extra_config+=(--enable-libmudflap)
   421     else
   422         extra_config+=(--disable-libmudflap)
   423     fi
   424     if [ "${CT_CC_GCC_LIBGOMP}" = "y" ]; then
   425         extra_config+=(--enable-libgomp)
   426     else
   427         extra_config+=(--disable-libgomp)
   428     fi
   429     if [ "${CT_CC_GCC_LIBSSP}" = "y" ]; then
   430         extra_config+=(--enable-libssp)
   431     else
   432         extra_config+=(--disable-libssp)
   433     fi
   434 
   435     # *** WARNING ! ***
   436     # Keep this full if-else-if-elif-fi-fi block in sync
   437     # with the same block in do_cc_core, above.
   438     if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
   439         final_LDFLAGS+=("-static")
   440         host_libstdcxx_flags+=("-static-libgcc")
   441         host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")
   442         host_libstdcxx_flags+=("-lm")
   443         # Companion libraries are build static (eg !shared), so
   444         # the libstdc++ is not pulled automatically, although it
   445         # is needed. Shoe-horn it in our LDFLAGS
   446         # Ditto libm on some Fedora boxen
   447         final_LDFLAGS+=("-lstdc++")
   448         final_LDFLAGS+=("-lm")
   449     else
   450         if [ "${CT_CC_STATIC_LIBSTDCXX}" = "y" ]; then
   451             # this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2
   452             # build script
   453             # FIXME: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,
   454             # see http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01635.html
   455             host_libstdcxx_flags+=("-static-libgcc")
   456             host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++,-Bdynamic")
   457             host_libstdcxx_flags+=("-lm")
   458         elif [ "${CT_COMPLIBS_SHARED}" != "y" ]; then
   459             # When companion libraries are build static (eg !shared),
   460             # the libstdc++ is not pulled automatically, although it
   461             # is needed. Shoe-horn it in our LDFLAGS
   462             # Ditto libm on some Fedora boxen
   463             final_LDFLAGS+=("-lstdc++")
   464             final_LDFLAGS+=("-lm")
   465         fi
   466     fi
   467 
   468     if [ "${CT_CC_GCC_USE_GMP_MPFR}" = "y" ]; then
   469         extra_config+=("--with-gmp=${CT_COMPLIBS_DIR}")
   470         extra_config+=("--with-mpfr=${CT_COMPLIBS_DIR}")
   471     fi
   472     if [ "${CT_CC_GCC_USE_MPC}" = "y" ]; then
   473         extra_config+=("--with-mpc=${CT_COMPLIBS_DIR}")
   474     fi
   475     if [ "${CT_CC_GCC_USE_GRAPHITE}" = "y" ]; then
   476         extra_config+=("--with-ppl=${CT_COMPLIBS_DIR}")
   477         # With PPL 0.11+, also pull libpwl if needed
   478         if [ "${CT_PPL_NEEDS_LIBPWL}" = "y" ]; then
   479             host_libstdcxx_flags+=("-L${CT_COMPLIBS_DIR}/lib")
   480             host_libstdcxx_flags+=("-lpwl")
   481         fi
   482         extra_config+=("--with-cloog=${CT_COMPLIBS_DIR}")
   483     elif [ "${CT_CC_GCC_HAS_GRAPHITE}" = "y" ]; then
   484         extra_config+=("--with-ppl=no")
   485         extra_config+=("--with-cloog=no")
   486     fi
   487     if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then
   488         extra_config+=("--with-libelf=${CT_COMPLIBS_DIR}")
   489     elif [ "${CT_CC_GCC_HAS_LTO}" = "y" ]; then
   490         extra_config+=("--with-libelf=no")
   491     fi
   492 
   493     if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then
   494         extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")
   495     fi
   496 
   497     if [ "${CT_THREADS}" = "none" ]; then
   498         extra_config+=("--disable-threads")
   499         if [ "${CT_CC_GCC_4_2_or_later}" = y ]; then
   500             CT_Test "Disabling libgomp for no-thread gcc>=4.2" "${CT_CC_GCC_LIBGOMP}" = "Y"
   501             extra_config+=("--disable-libgomp")
   502         fi
   503     else
   504         if [ "${CT_THREADS}" = "win32" ]; then
   505             extra_config+=("--enable-threads=win32")
   506             extra_config+=("--disable-win32-registry")
   507         else
   508             extra_config+=("--enable-threads=posix")
   509         fi
   510     fi
   511 
   512     if [ "${CT_CC_GCC_ENABLE_TARGET_OPTSPACE}" = "y" ]; then
   513         extra_config+=("--enable-target-optspace")
   514     fi
   515     if [ "${CT_CC_GCC_DISABLE_PCH}" = "y" ]; then
   516         extra_config+=("--disable-libstdcxx-pch")
   517     fi
   518 
   519     case "${CT_CC_GCC_LDBL_128}" in
   520         y)  extra_config+=("--with-long-double-128");;
   521         m)  ;;
   522         "") extra_config+=("--without-long-double-128");;
   523     esac
   524 
   525     if [ "${CT_CC_GCC_ENABLE_PLUGINS}" = "y" ]; then
   526         extra_config+=( --enable-plugin )
   527     fi
   528     if [ "${CT_CC_GCC_GOLD}" = "y" ]; then
   529         extra_config+=( --enable-gold )
   530     fi
   531 
   532     CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
   533 
   534     # --disable-nls to work around crash bug on ppc405, but also because
   535     # embedded systems don't really need message catalogs...
   536     CT_DoExecLog CFG                                \
   537     CC_FOR_BUILD="${CT_BUILD}-gcc"                  \
   538     CFLAGS="${CT_CFLAGS_FOR_HOST}"                  \
   539     LDFLAGS="${final_LDFLAGS[*]}"                   \
   540     CFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"         \
   541     CXXFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"       \
   542     LDFLAGS_FOR_TARGET="${CT_TARGET_LDFLAGS}"       \
   543     "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/configure"  \
   544         --build=${CT_BUILD}                         \
   545         --host=${CT_HOST}                           \
   546         --target=${CT_TARGET}                       \
   547         --prefix="${CT_PREFIX_DIR}"                 \
   548         ${CC_SYSROOT_ARG}                           \
   549         "${extra_config[@]}"                        \
   550         --with-local-prefix="${CT_SYSROOT_DIR}"     \
   551         --disable-nls                               \
   552         --enable-c99                                \
   553         --enable-long-long                          \
   554         ${CT_CC_EXTRA_CONFIG}
   555 
   556     if [ "${CT_CANADIAN}" = "y" ]; then
   557         CT_DoLog EXTRA "Building libiberty"
   558         CT_DoExecLog ALL make ${JOBSFLAGS} all-build-libiberty
   559     fi
   560 
   561     CT_DoLog EXTRA "Building final compiler"
   562     CT_DoExecLog ALL make ${JOBSFLAGS} all
   563 
   564     CT_DoLog EXTRA "Installing final compiler"
   565     CT_DoExecLog ALL make install
   566 
   567     # Create a symlink ${CT_TARGET}-cc to ${CT_TARGET}-gcc to always be able
   568     # to call the C compiler with the same, somewhat canonical name.
   569     # check whether compiler has an extension
   570     file="$( ls -1 "${CT_PREFIX_DIR}/bin/${CT_TARGET}-gcc."* 2>/dev/null || true )"
   571     [ -z "${file}" ] || ext=".${file##*.}"
   572     CT_DoExecLog ALL ln -sv "${CT_TARGET}-gcc${ext}" "${CT_PREFIX_DIR}/bin/${CT_TARGET}-cc${ext}"
   573 
   574     CT_EndStep
   575 }