kit

Containerfile (2688B)

---

 # test/libc/musl/Containerfile — produces a static musl aarch64 sysroot
 # tarball on stdout. Pinned to Alpine 3.20.10 + musl 1.2.5.
 #
 # Usage (driven by test/libc/musl/extract.sh):
 #   podman build --platform linux/arm64 -f Containerfile -t kit-musl-sysroot .
 #   podman run --rm kit-musl-sysroot > sysroot.tar
 #
 # The image's ENTRYPOINT writes a tar of /sysroot to stdout. The extract
 # script unpacks it into build/musl-sysroot/ on the host.
 FROM docker.io/arm64v8/alpine:3.20.10
 
 # musl-dev: Scrt1.o, crt1.o, crti.o, crtn.o, libc.a + headers under /usr/include.
 # Plus the dynamic linker / libc.so used by the dynamic-link variant of the
 # harness (in musl, /lib/ld-musl-aarch64.so.1 *is* libc — same file).
 # linux-headers: kernel uapi (linux/*, asm/*, asm-generic/*) — used by syscall
 # definitions in the musl headers.
 # gcc: pulled in for its *runtime only* (libgcc + crt{begin,end}*.o), staged
 # below so this is a COMPLETE toolchain sysroot — a standard `clang --sysroot`
 # cross-link works against it, not just kit. (kit still links its own rt/ for the
 # soft-float / TF / 128-bit-int helpers; only gcc's runtime objects are copied
 # into the sysroot, not the compiler.)
 RUN apk add --no-cache musl-dev linux-headers gcc
 
 # Stage a standard FHS sysroot so both kit and a plain `clang --sysroot`
 # cross-link can consume it:
 #   /sysroot/usr/include/  — libc + linux-headers
 #   /sysroot/usr/lib/      — crt objects, static libc, ssp, gcc runtime
 #   /sysroot/lib/          — dynamic loader (in musl, this IS libc.so)
 # cp -aL dereferences the alpine triple symlink + libgcc_s links so the
 # extracted tree is self-contained. find locates libgcc_s.so.1 (musl: /usr/lib).
 RUN set -eux; \
     mkdir -p /sysroot/usr/include /sysroot/usr/lib /sysroot/lib; \
     cp -r /usr/include/. /sysroot/usr/include/; \
     cp /usr/lib/crt1.o /usr/lib/Scrt1.o /usr/lib/rcrt1.o \
        /usr/lib/crti.o /usr/lib/crtn.o \
        /usr/lib/libc.a /usr/lib/libssp_nonshared.a \
        /sysroot/usr/lib/; \
     cp /lib/ld-musl-aarch64.so.1 /sysroot/lib/; \
     ln -s ../../lib/ld-musl-aarch64.so.1 /sysroot/usr/lib/libc.so; \
     cp -aL /usr/lib/gcc /sysroot/usr/lib/gcc; \
     cp -L "$(find /usr/lib /lib -name libgcc_s.so.1 | head -1)" /sysroot/usr/lib/libgcc_s.so.1; \
     ln -sf libgcc_s.so.1 /sysroot/usr/lib/libgcc_s.so; \
     for d in /sysroot/usr/lib/gcc/*-alpine-linux-musl; do \
         ln -sfn "$(basename "$d")" "${d%-alpine-linux-musl}-linux-musl"; \
     done
 
 # Pin the build for cache reuse and reproducibility audits.
 RUN echo "alpine 3.20.10  musl 1.2.5-r3" > /sysroot/PROVENANCE \
  && uname -m >> /sysroot/PROVENANCE
 
 ENTRYPOINT ["sh", "-c", "tar -C /sysroot -cf - ."]