gollvm build on rpi and target wasm

Dockerfile-ll1

# To make sense, see the mailinglist archive item
# https://www.mail-archive.com/golang-nuts@googlegroups.com/msg47286.html
# Also, manage the mono repo fetch separately and avoid docker repeating the step
FROM ll0
WORKDIR /opt
RUN tar -xzf git-09629215c272f09e3ebde6cc7eac9625d28910ff.tgz
RUN rm git-09629215c272f09e3ebde6cc7eac9625d28910ff.tgz

Dockerfile-ll2

FROM ll1
RUN apt -qq update && \
    apt -qq install --no-install-recommends -y git ninja-build cmake build-essential  \
     clang autoconf ca-certificates python3

WORKDIR /opt

RUN cd llvm-project/llvm/tools  \
    && git clone https://go.googlesource.com/gollvm

RUN cd llvm-project/llvm/tools/gollvm \
    && git checkout 0e34e09fc15cde73f1b9974f2a657360abb94b4f \
    && git clone https://go.googlesource.com/gofrontend

RUN cd llvm-project/llvm/tools/gollvm/gofrontend \
    && git checkout 7f33baa09a8172bb2c5f1ca0435d9efe3e194c9b

RUN cd llvm-project/llvm/tools/gollvm/libgo  \
    && git clone https://github.com/libffi/libffi.git

RUN cd llvm-project/llvm/tools/gollvm/libgo/libffi  \
    && git checkout ab1677106605aba1c27665964ff90bea59612ce3

RUN cd llvm-project/llvm/tools/gollvm/libgo  \
    && git clone https://github.com/ianlancetaylor/libbacktrace.git

RUN cd llvm-project/llvm/tools/gollvm/libgo/libbacktrace  \
    && git checkout 2446c66076480ce07a6bd868badcbceb3eeecc2e

RUN mkdir /opt/build-debug && cd /opt/build-debug \
    && cmake -DCMAKE_BUILD_TYPE=Debug \
             -DCMAKE_C_COMPILER=clang \
             -DCMAKE_CXX_COMPILER=clang++ \
             -DLLVM_USE_LINKER=gold \
             -DLLVM_TARGETS_TO_BUILD="WebAssembly" \
             -DGOLLVM_USE_SPLIT_STACK=OFF \
             -DCMAKE_INSTALL_PREFIX=/opt/dist \
             -G Ninja ../llvm-project/llvm

lxc-gollvm.sh

snap info lxd
sudo usermod -a -G lxd username
sudo reboot
sudo lxd init
lxc launch ubuntu:22.04 gollvm
lxc exec gollvm -- apt update && apt upgrade -y
lxc exec gollvm -- sudo --user ubuntu --login
mkdir workarea && cd workarea
git clone https://github.com/llvm/llvm-project.git
cd llvm-project && git checkout 09629215c272f09e3ebde6cc7eac9625d28910ff
cd llvm/tools && git clone https://go.googlesource.com/gollvm
cd gollvm && git checkout 0e34e09fc15cde73f1b9974f2a657360abb94b4f
git clone https://go.googlesource.com/gofrontend
cd gofrontend && git checkout 7f33baa09a8172bb2c5f1ca0435d9efe3e194c9b
cd ../libgo && git clone https://github.com/libffi/libffi.git
cd libffi && git checkout ab1677106605aba1c27665964ff90bea59612ce3
cd .. && git clone https://github.com/ianlancetaylor/libbacktrace.git
cd libbacktrace && git checkout 2446c66076480ce07a6bd868badcbceb3eeecc2e
exit
# back to host
# take snapshot
lxc copy gollvm  gollvm-09629215c272f09e3ebde6cc7eac9625d28910ff
lxc exec gollvm-02 -- apt -qq install --no-install-recommends -y \
        ninja-build build-essential cmake clang autoconf python3 ca-certificates
# take snapshot
lxc copy gollvm-02 gollvm-03
lxc exec gollvm-03 -- sudo --user ubuntu --login
cd workarea && mkdir build.rel && cd build.rel
cmake -DCMAKE_INSTALL_PREFIX=/opt/test -DCMAKE_BUILD_TYPE=Release \
      -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ \
      -DLLVM_USE_LINKER=gold -DGOLLVM_USE_SPLIT_STACK=OFF \
      -G Ninja ../llvm-project/llvm

ninja gollvm
ninja install-gollvm
exit
# back to host
lxc file pull gollvm-03 /opt/test .

The dockerfiles are more as documentation because LXC is a better fit for dealing with the 4K objects of the LLVM monorepo. Attaching a shell script, not to be run as-is rather to list out the steps that allowed gollvm to finally actually complete.