Dockerized LLVM (#1914)

Optionally build with dockererized custom llvm

sdk/docker-llvm/Dockerfile

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+# This docker file is based on the llvm docker file example located here:
+# https://github.com/llvm-mirror/llvm/blob/master/utils/docker/debian8/Dockerfile
+
+FROM launcher.gcr.io/google/debian8:latest as builder
+LABEL maintainer "Solana Maintainers"
+
+# Install build dependencies of llvm.
+# First, Update the apt's source list and include the sources of the packages.
+RUN grep deb /etc/apt/sources.list | \
+    sed 's/^deb/deb-src /g' >> /etc/apt/sources.list
+
+# Install compiler, python and subversion.
+RUN apt-get update && \
+    apt-get install -y \
+                    --no-install-recommends \
+                    ca-certificates gnupg \
+                    build-essential \
+                    python \
+                    wget \
+                    unzip \
+                    git \
+                    ssh && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install a newer ninja release. It seems the older version in the debian repos
+# randomly crashes when compiling llvm.
+RUN wget "https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip" && \
+    echo "d2fea9ff33b3ef353161ed906f260d565ca55b8ca0568fa07b1d2cab90a84a07 ninja-linux.zip" \
+        | sha256sum -c  && \
+    unzip ninja-linux.zip -d /usr/local/bin && \
+    rm ninja-linux.zip
+
+# Import public key required for verifying signature of cmake download.
+RUN gpg --no-tty --keyserver hkp://pgp.mit.edu --recv 0x2D2CEF1034921684
+
+# Download, verify and install cmake version that can compile clang into /usr/local.
+# (Version in debian8 repos is too old)
+RUN mkdir /tmp/cmake-install && cd /tmp/cmake-install && \
+    wget "https://cmake.org/files/v3.7/cmake-3.7.2-SHA-256.txt.asc" && \
+    wget "https://cmake.org/files/v3.7/cmake-3.7.2-SHA-256.txt" && \
+    gpg --verify cmake-3.7.2-SHA-256.txt.asc cmake-3.7.2-SHA-256.txt && \
+    wget "https://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.tar.gz" && \
+    ( grep "cmake-3.7.2-Linux-x86_64.tar.gz" cmake-3.7.2-SHA-256.txt | \
+      sha256sum -c - ) && \
+    tar xzf cmake-3.7.2-Linux-x86_64.tar.gz -C /usr/local --strip-components=1 && \
+    cd / && \
+    rm -rf /tmp/cmake-install
+
+# ADD checksums /tmp/checksums
+# ADD scripts /tmp/scripts
+
+# Checkout the source code 
+RUN git clone https://github.com/solana-labs/llvm.git && \
+    git clone https://github.com/solana-labs/clang.git llvm/tools/clang && \
+    git clone https://github.com/solana-labs/clang-tools-extra.git llvm/tools/clang/tools/extra  && \
+    git clone https://github.com/solana-labs/lld.git llvm/tools/lld  && \
+    git clone https://github.com/solana-labs/compiler-rt.git llvm/projects/compiler-rt
+
+RUN mkdir /llvm/build && \
+    cd /llvm/build && \
+    cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_INSTALL_PREFIX=$HOME/local -G "Ninja" .. && \
+    ninja -j6 && \
+    ninja install
+
+# Produce stage 2 docker with just the peices needed
+FROM launcher.gcr.io/google/debian8:latest
+LABEL maintainer "Solana Maintainers"
+COPY --from=builder root/local/bin /usr/local/bin

sdk/docker-llvm/README.md

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+## Solana Customized LLVM
+
+This Docker contains LLVM binaries that incorporate customizations and fixes required
+by Solana but not yet upstreamed into the LLVM mainline.
+
+https://hub.docker.com/r/solanalabs/llvm/
+
+### Usage:
+
+This Docker is optionally used by the SDK BPF build system.
+
+For more information:
+
+```bash
+$ make help
+```

sdk/docker-llvm/build.sh

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+#!/usr/bin/env bash
+set -ex
+
+cd "$(dirname "$0")"
+
+docker build -t solanalabs/llvm .
+docker push solanalabs/llvm