#!/bin/sh -e

TARGET=x86_64-elf
SYSROOT=/opt/sysroot

# Pull or update musl libc
mkdir -p /opt/external && cd /opt/external
[ -d musl ] || git clone --depth=1 git://git.musl-libc.org/musl
cd musl
git reset --hard
git pull

# Apply patches
[ -d /opt/src/patch-musl ] && rsync -a /opt/src/patch-musl/ /opt/external/musl/

# Build and install
mkdir -p /opt/external/build-musl && cd /opt/external/build-musl
rm -r *
../musl/configure \
    --target=${TARGET} \
    --prefix=${SYSROOT}/usr \
    --disable-shared \
    --enable-debug \
    CFLAGS="-O0 -mcmodel=large -mno-red-zone"

make
make install-headers
make install