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Building classic Flang on LLVM 10

Sample script (adapted from upstream instructions):

#!/bin/bash

buildtype=Debug
installdir=$PWD/install

if [ ! -d classic-flang-llvm ]; then
  git clone https://github.com/Huawei-PTLab/classic-flang-llvm
fi
if [ ! -d flang ]; then
  git clone https://github.com/flang-compiler/flang
fi

mkdir -p build/llvm
pushd build/llvm
cmake -G Ninja \
  -DCMAKE_BUILD_TYPE=$buildtype \
  -DCMAKE_INSTALL_PREFIX=$installdir \
  -DCMAKE_C_COMPILER=gcc \
  -DCMAKE_CXX_COMPILER=g++ \
  -DLLVM_ENABLE_PROJECTS="clang;openmp" \
  -DLLVM_ENABLE_CLASSIC_FLANG=on \
  -DLLVM_ENABLE_ASSERTIONS=on \
  -DLLVM_OPTIMIZED_TABLEGEN=on \
  -DLLVM_TARGETS_TO_BUILD="X86;AArch64" \
  ../../classic-flang-llvm/llvm || exit 1
ninja -j1 install || exit 1
popd

if ! llvm_lit="$(realpath --canonicalize-existing $PWD/build/llvm/bin/llvm-lit 2>/dev/null)" || \
    [ ! -x "$llvm_lit" ]; then
  echo "no usable llvm-lit"
  exit 1
fi

mkdir -p build/libpgmath
pushd build/libpgmath
cmake -G Ninja \
  -DCMAKE_BUILD_TYPE=$buildtype \
  -DCMAKE_INSTALL_PREFIX=$installdir \
  -DCMAKE_C_COMPILER=gcc \
  -DCMAKE_CXX_COMPILER=g++ \
  -DLLVM_CONFIG=$installdir/bin/llvm-config \
  -DLLVM_TARGETS_TO_BUILD="X86;AArch64" \
  -DLIBPGMATH_LLVM_LIT_EXECUTABLE="$llvm_lit" \
  ../../flang/runtime/libpgmath || exit 1
ninja check-libpgmath install || exit 1
popd

mkdir -p build/flang
pushd build/flang
cmake -Wno-dev -G 'Unix Makefiles' \
  -DCMAKE_BUILD_TYPE=$buildtype \
  -DCMAKE_INSTALL_PREFIX=$installdir \
  -DCMAKE_C_COMPILER=$installdir/bin/clang \
  -DCMAKE_CXX_COMPILER=$installdir/bin/clang++ \
  -DCMAKE_Fortran_COMPILER=$installdir/bin/flang \
  -DLLVM_CONFIG=$installdir/bin/llvm-config \
  -DLLVM_TARGETS_TO_BUILD="X86;AArch64" \
  -DLLVM_EXTERNAL_LIT="$llvm_lit" \
  ../../flang || exit 1
make -j2 install || exit 1
make check-all || exit 1
popd

echo "SUCCESS"