add musl build

Author: nickdesaulniers

musl/Dockerfile.musl

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+FROM alpine:edge
+
+# TODO: change to container registry
+COPY --from=clangbuiltlinux/containers:llvm-project llvm-project/llvm/build/bin /usr/local/bin
+COPY --from=clangbuiltlinux/containers:llvm-project /usr/local/lib /usr/local/lib
+COPY --from=clangbuiltlinux/containers:llvm-project /usr/local/include /usr/local/include
+RUN ln -s /usr/local/lib/x86_64-alpine-linux-musl/libc++abi.so.1 /usr/lib/. && \
+  ln -s /usr/local/lib/x86_64-alpine-linux-musl/libc++.a /usr/lib/. && \
+  ln -s /usr/local/lib/x86_64-alpine-linux-musl/libc++abi.a /usr/lib/. && \
+  ln -s /usr/local/lib/x86_64-alpine-linux-musl/libc++.so.1 /usr/lib/. && \
+  ln -s /usr/local/lib/x86_64-alpine-linux-musl/libunwind.so.1 /usr/lib/. && \
+  ln -s /usr/local/lib/x86_64-alpine-linux-musl/libunwind.a /usr/lib/.
+
+RUN apk add wget
+
+RUN wget --no-clobber --no-verbose https://musl.libc.org/releases/musl-1.2.3.tar.gz && \
+  tar xvf musl-1.2.3.tar.gz
+
+# TODO: doesn't musl need the kernel headers?
+#COPY --from=clangbuiltlinux/containers:linux /sysroot /sysroot
+
+RUN mkdir musl-1.2.3/build
+RUN cd musl-1.2.3/build && \
+  CC=clang ../configure --prefix=/usr --syslibdir=/usr/lib
+
+# TODO: build llvm-ar
+RUN apk add make llvm13
+RUN cd musl-1.2.3/build && \
+  make -j$(nproc) AR=llvm-ar RANLIB=llvm-ranlib
+
+RUN cd musl-1.2.3/build && \
+  make -j$(nproc) DESTDIR=/sysroot install-headers
+
+RUN cd musl-1.2.3/build && \
+  make -j$(nproc) DESTDIR=/sysroot install-libs
+
+COPY hello.c .
+RUN clang --sysroot=/sysroot hello.c && ./a.out

musl/build.sh

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+#!/usr/bin/env sh
+docker build --tag clangbuiltlinux/containers:musl . -f Dockerfile.musl

musl/hello.c

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+#include <stdio.h>
+int main() { puts("hello world"); }