Add LLVM toolchain with GCC-based sysroot#380
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Adds a hermetic LLVM/Clang toolchain that reuses the S-CORE GCC package's sysroot.
Clang and GCC now build against the same libc/libstdc++, giving reproducible cross-toolchain builds without a separately maintained sysroot.
Clang should use the same libc/libstdc++ as GCC. But the GCC package keeps libstdc++ (
<triple>/include/c++) and its support libs (lib/gcc) outside the sysroot, whereas under--sysrootClang only looks inusr/include/c++andusr/lib/gcc. Also,llvm.sysrootneeds the sysroot dir to be its own Bazel package.Since we can't modify the GCC package repo, the
gcc_sysrootrule builds a self-contained sysroot: it copies the bare sysroot out of the already-extracted@score_gcc_x86_64_toolchain_pkg, folds the headers and libs into it, and adds a BUILD file. Clang then finds everything from--sysrootalone.