Dockerfile

# Use Fedora as it has llvm-4 packages that seem to work
FROM fedora

RUN dnf -y update && dnf clean all
RUN dnf -y install llvm-4.0.1 llvm-devel-4.0.1 llvm-libs-4.0.1 \
                   llvm-static-4.0.1 clang-4.0.1 \
                   ncurses-devel zlib-devel \
                   git cmake which findutils \
    && dnf clean all

ENV CMAKE_BUILD_TYPE Release
ENV MAKE_JOBS 4

# Modified clang
RUN mkdir -p /opt/src/ \
 && git clone https://github.com/flang-compiler/clang.git /opt/src/clang \
 && cd /opt/src/clang \
 && git checkout flang_release_40 \
 && mkdir build && cd build \
 && cmake .. -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} \
 && make -j ${MAKE_JOBS} \
 && make install \
 && rm -rf /opt/src/clang

# OpenMP required by flang
RUN git clone https://github.com/llvm-mirror/openmp.git /opt/src/openmp \
 && cd /opt/src/openmp/runtime \
 && git checkout release_40 \
 && mkdir build && cd build \
 && cmake .. -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} \
 && make -j ${MAKE_JOBS} \
 && make install \
 && rm -rf /opt/src/openmp

# Compile flang with modified clang
RUN git clone https://github.com/flang-compiler/flang.git /opt/src/flang \
 && cd /opt/src/flang \
 && mkdir build && cd build \
 && cmake -DLLVM_CMAKE_PATH=/usr/lib64/cmake/llvm -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang -DCMAKE_Fortran_COMPILER=flang -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} .. \
 && make -j ${MAKE_JOBS} \
 && make install \
 && rm -rf /opt/src/flang

# Add to linker path so that binaries can find the libraries
RUN echo -e "/usr/local/lib\n/usr/local/lib64" > /etc/ld.so.conf.d/flang.conf
RUN ldconfig

# Test if it works
WORKDIR /root/
RUN echo -e "program hello\n  print *, 'hello world'\n end" > hello.f90
RUN flang -o hello hello.f90
RUN ./hello

CMD exec bash