build-haiku-crosstools.sh

# install dependencies
sudo apt-get install curl git python nasm autoconf automake texinfo flex bison gawk build-essential unzip wget zip zlib1g-dev libcurl4-openssl-dev genisoimage libtool

# get Haiku and compiler sources
git clone --depth=1 https://github.com:/haiku/buildtools
git clone --depth=1 https://github.com:/haiku/haiku

# Build jam (with Haiku changes)
cd ~/buildtools/
make
sudo ./jam0  install

# Fetch tags (needed to build Haiku)
cd ~/haiku/
git remote add upstream https://git.haiku-os.org/haiku
git fetch upstream --tags

# Build the toolchain
mkdir generated
cd generated/
../configure --build-cross-tools x86_64 ../../buildtools --use-gcc-pipe -j16

# Compile Haiku
jam -q -j16 @nightly-raw
cd ~/

# Create script to run "package" from HAiku tools (with apropriate libpath)
cat >package.sh <<-EOF
#!/bin/bash

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$HOME/haiku/generated/objects/linux/lib
$HOME/haiku/generated/objects/linux/x86_64/release/tools/package/package $@
EOF
chmod a+x package.sh

# Download script to build cross-compiler
wget https://gist.githubusercontent.com/jessicah/5bc1da8f72ace11d77a42335951242e6/raw/build_cross_tools_gcc4
chmod a+x build_cross_tools_gcc4
mkdir cross

# Now we can finally build the cross compiler itself
./build_cross_tools_gcc4 x86_64-unknown-haiku ./haiku/ ./buildtools/ cross -j16
sudo ln -s $HOME/cross/sysroot/boot/system/ /system

# Extract files from Haiku packages (to build an environment usable on the host)
find haiku/generated/objects/haiku/x86_64/packaging/repositories/ -name '*.hpkg' -exec ./package.sh extract -C cross/sysroot/boot/system/ {} \;
./package.sh extract -C cross/sysroot/boot/system/ ~/haiku/generated/download/gcc_syslibs-*.hpkg
./package.sh extract -C cross/sysroot/boot/system/ ~/haiku/generated/download/gcc_syslibs_devel-*.hpkg

# Fixup some library paths
cd ~/cross/sysroot/boot/system/develop/lib/
ln -s ../../lib/libgcc_s.so libgcc_s.so
cd ~/

# Add the toolchain binaries to the path
export PATH=$PATH:$HOME/cross/bin

# Now ready to build...