Add experimental alpine linux64 base image

images/base-linux64/Dockerfile

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+FROM alpine:edge
+
+ENV CARGO_HOME="/opt/cargo" PATH="/opt/cargo/bin:${PATH}"
+RUN \
+    apk add --no-cache \
+        yasm nasm diffutils xxd pkgconf git ca-certificates curl wget unzip subversion autoconf automake libtool perl make cmake clang texinfo gperf gettext gettext-dev gettext-static itstool ragel musl-dev openssl-dev zlib-dev bzip2-static gtk-doc gobject-introspection gawk meson samurai p7zip python3 \
+        binutils gcc g++ gfortran \
+        rust cargo && \
+    ln -s python3 /usr/bin/python && \
+    cargo install cargo-c && rm -rf "${CARGO_HOME}"/{registry,git} && \
+    git config --global user.email "builder@localhost" && \
+    git config --global user.name "Builder" && \
+    mkdir /opt/ffbuild
+
+ADD run_stage.sh /usr/bin/run_stage
+ADD git-mini-clone.sh /usr/bin/git-mini-clone
+ADD check-wget.sh /usr/bin/check-wget
+
+ADD toolchain.cmake /toolchain.cmake
+ADD cross.meson /cross.meson
+
+ENV FFBUILD_TARGET_FLAGS="" \
+    FFBUILD_TOOLCHAIN=x86_64-alpine-linux-musl \
+    FFBUILD_CROSS_PREFIX="" \
+    FFBUILD_RUST_TARGET="" \
+    FFBUILD_PREFIX=/opt/ffbuild \
+    FFBUILD_CMAKE_TOOLCHAIN=/toolchain.cmake \
+    PKG_CONFIG_LIBDIR=/opt/ffbuild/lib/pkgconfig \
+    CFLAGS="-static-libgcc -static-libstdc++ -I/opt/ffbuild/include -O2 -pipe -D_FORTIFY_SOURCE=2 -fstack-protector-strong" \
+    CXXFLAGS="-static-libgcc -static-libstdc++ -I/opt/ffbuild/include -O2 -pipe -D_FORTIFY_SOURCE=2 -fstack-protector-strong" \
+    LDFLAGS="-static-libgcc -static-libstdc++ -L/opt/ffbuild/lib -O2 -pipe -fstack-protector-strong"

images/base-linux64/check-wget.sh

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+#!/bin/bash
+set -xe
+FNAME="$1"
+URL="$2"
+SHA512="$3"
+SHAFILE="${FNAME}.sha512"
+wget -O "${FNAME}" "${URL}"
+trap "rm -f ${SHAFILE}" EXIT
+echo "${SHA512}  ${FNAME}" > "${SHAFILE}"
+sha512sum -c "${SHAFILE}"

images/base-linux64/cross.meson

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+[binaries]
+c = 'x86_64-alpine-linux-musl-gcc'
+cpp = x86_64-alpine-linux-musl-g++'
+ar = 'ar'
+strip = 'strip'
+
+[properties]
+c_link_args = ['-static-libgcc', '-L/opt/ffbuild/lib', '-O2', '-pipe', '-fstack-protector-strong']
+cpp_link_args = ['-static-libgcc', '-static-libstdc++', '-L/opt/ffbuild/lib', '-O2', '-pipe', '-fstack-protector-strong']
+
+[host_machine]
+system = 'linux'
+cpu_family = 'x86_64'
+cpu = 'x86_64'
+endian = 'little'

images/base-linux64/git-mini-clone.sh

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+#!/bin/bash
+set -xe
+REPO="$1"
+REF="$2"
+DEST="$3"
+git init "$DEST"
+git -C "$DEST" remote add origin "$REPO"
+git -C "$DEST" fetch --depth=1 origin "$REF"
+git -C "$DEST" config advice.detachedHead false
+git -C "$DEST" checkout FETCH_HEAD

images/base-linux64/run_stage.sh

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+#!/bin/bash
+set -xe
+mkdir -p /stage
+source "$1"
+cd /stage
+ffbuild_dockerbuild
+rm -rf /stage "$FFBUILD_PREFIX"/bin

images/base-linux64/toolchain.cmake

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+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+
+set(CMAKE_C_COMPILER x86_64-alpine-linux-musl-gcc)
+set(CMAKE_CXX_COMPILER x86_64-alpine-linux-musl-g++)
+set(CMAKE_RANLIB ranlib)
+
+set(CMAKE_FIND_ROOT_PATH /usr/x86_64-alpine-linux-musl /opt/ffbuild)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)