Source
FROM scratch AS base
ARG ARCH=x86_64
ENV VERSION=1.2.4
ENV SRC_FILE=musl-${VERSION}.tar.gz
ENV SRC_SITE=http://musl.libc.org/releases/${SRC_FILE}
ENV SRC_HASH=7a35eae33d5372a7c0da1188de798726f68825513b7ae3ebe97aaaa52114f039
ENV CFLAGS="-Os -fstack-clash-protection -Wformat -Werror=format-security"
ENV CXXFLAGS="-Os -fstack-clash-protection -Wformat -Werror=format-security -D_GLIBCXX_ASSERTIONS=1 -D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS=1 -D_LIBCPP_ENABLE_HARDENED_MODE=1"
ENV LDFLAGS="-Wl,--as-needed,-O1,--sort-common -Wl,-soname,libc.musl-${ARCH}.so.1"
FROM base AS fetch
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .
FROM fetch AS build
COPY --from=stagex/stage3 . /
RUN tar -xzf ${SRC_FILE}
WORKDIR /musl-${VERSION}
ADD *.patch .
RUN --network=none <<-EOF
set -eux; \
patch -p1 < lfs64.patch
patch -p1 < lfs64-2.patch
patch -p1 < relr-typedefs.patch
./configure \
--build=${ARCH}-linux-musl \
--host=${ARCH}-linux-musl \
--prefix=/usr \
--sysconfdir=/etc \
--mandir=/usr/share/man \
--infodir=/usr/share/info \
--localstatedir=/var \
--enable-debug
make -j "$(nproc)"
EOF
FROM build AS install
RUN --network=none <<-EOF
set -eux
make DESTDIR=/rootfs install
mkdir -p /rootfs/usr/bin /rootfs/usr/lib
rm -rf /rootfs/lib
ln -sf /usr/lib/ld-musl-${ARCH}.so.1 /rootfs/usr/bin/ldd
mv -f /rootfs/usr/lib/libc.so /rootfs/usr/lib/ld-musl-${ARCH}.so.1
ln -sf ld-musl-${ARCH}.so.1 /rootfs/usr/lib/libc.musl-${ARCH}.so.1
ln -sf /usr/lib/ld-musl-${ARCH}.so.1 /rootfs/usr/lib/libc.so
EOF
FROM stagex/filesystem AS package
COPY --from=install /rootfs/. /