This page shows how to bootstrap a multiarch cross toolchain.

Multiarch-Cross-Toolchain, aka as known as Wookey's way, just lke cross-gcc does.

It has pacakges like gcc-<VERSION>-<TRIPLET>, it dpends on

This also shows how to bootstrap for a new architecture.

STEP 0 preparation

sudo debootstrap sid sid-chroot sudo pbuilder login --no-targz --buildplace sid-chroot sed -i ’s/^deb http/deb [arch=amd64] http/‘ /etc/apt/sources.list echo “deb-src http://ftp.us.debian.org/debian sid main” >> /etc/apt/sources.list dpkg --add-architecture mips64el apt-get update apt-get install binutils-mips64el-linux-gnuabi64 devscripts rdfind symlinks

STEP 1 build gcc stage1

apt-get build-dep gcc-5 apt-get purge libx32* libc6-i386 libc6-x32 # they conflicts with mips64el multilib packages

apt-get source gcc-5 apt-get install cross-gcc-dev

if you need gnat support, you'd wish add some other patches from: BUG:#782257 #783372

cd gcc-5-*; patch -p1 < /tmp/0001-version.patch patch -p1 < /tmp/0002-control.patch patch -p1 < /tmp/0003-patch.patch

patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0001-gcc_cross_multiarch.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0002-allow-no-biarch.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0003-gxx-crossbase-substvar.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0004-reverted-removal-of-with_deps_on_target_arch_pkgs-in.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0005-Allow-target-selection-via-dpkg-buildpackage-target-.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0006-fix-with_deps_on_target_arch_pkgs-yes-DEB_STAGE-stag.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0007-Skip-libjit-when-we-re-cross-building.patch patch -p1 < /usr/share/cross-gcc/patches/gcc-5/0008-g-include-directories-functional-again.patch

sed -i '/^ada_no_cross/c ada_no_cross := yes' debian/rules.defs

Then run: with_deps_on_target_arch_pkgs=yes DH_VERBOSE=1 WITH_SYSROOT=/ \ BACKPORT=false PKG_IGNORE_CURRENTLY_BUILDING=1 \ DEB_BUILD_OPTIONS=nostrip DEB_STAGE=stage1 dpkg-buildpackage \

We can get these deb files: cpp-5-mips64el-linux-gnuabi64 gcc-5-multilib-mips64el-linux-gnuabi64 libgcc-5-dev gcc-5-mips64el-linux-gnuabi64 lib32gcc-5-dev libn32gcc-5-dev

dpkg --force-all -i ../*.deb

STEP 2 build linux-libc-dev

apt-get source linux; cd linux-* make -f debian/rules.gen binary-libc-dev_mips64el dpkg -i ../linux-libc-dev*.deb

STEP 3 glibc stage1 apt-get source glibc; cd glibc-*

patch the source with patch from BUG:#773300

Then run DEB_STAGE=stage1 DEB_GCC_VERSION=-5 dpkg-buildpackage -B -amips64el -d dpkg --force-all -i ../libc6*.deb

STEP 4 gcc stage2

with_deps_on_target_arch_pkgs=yes DH_VERBOSE=1 WITH_SYSROOT=/ \ BACKPORT=false PKG_IGNORE_CURRENTLY_BUILDING=1 \ DEB_BUILD_OPTIONS=nostrip DEB_STAGE=stage2 dpkg-buildpackage \

on the same source with stage1 gcc.

We can get these Debs cpp-5-mips64el-linux-gnuabi64 lib32gcc-4.9-dev libgcc1-dbg libn32gcc1 gcc-5-base lib32gcc1-dbg libgcc1 gcc-5-mips64el-linux-gnuabi64 lib32gcc1 libn32gcc-4.9-dev gcc-5-multilib-mips64el-linux-gnuabi64 libgcc-5-dev libn32gcc1-dbg

install them

dpkg -i ../*.deb

STEP 5 glibc stage2 DEB_STAGE=stage2 DEB_GCC_VERSION=-5 dpkg-buildpackage -B -amips64el -d We can get Debs and install them

dpkg -i ../libc6_2.19-13_mips64el.deb ../libc6-dev_2.19-13_mips64el.deb ../libc6-dev-mips*.deb ../libc6-mips*.deb

STEP 6 gcc stage3

with_deps_on_target_arch_pkgs=yes DH_VERBOSE=1 WITH_SYSROOT=/ \ BACKPORT=false PKG_IGNORE_CURRENTLY_BUILDING=1 \ DEB_BUILD_OPTIONS=nostrip dpkg-buildpackage \

STEP 7 gmp/selinux

STEP 8 gcc with gnat support

sed -i '/^ada_no_cross/c ada_no_cross := no' debian/rules.defs with_deps_on_target_arch_pkgs=yes DH_VERBOSE=1 WITH_SYSROOT=/ \ BACKPORT=false PKG_IGNORE_CURRENTLY_BUILDING=1 \ DEB_BUILD_OPTIONS=nostrip dpkg-buildpackage \