This is a schematic script to enable cmake compilation with late versions of Xcode on a Mac

cmake_xcode_workaround.sh

# This is a schematic script to enable cmake compilation with late versions of Xcode on a Mac
# This is the first problem: https://www.anaconda.com/blog/utilizing-the-new-compilers-in-anaconda-distribution-5
# Other routes may be possible...

# We appear to need libomp and llvm alongside cmake, so
brew install cmake libomp llvm

# 1. Grab MacOSX10.9.sdk from https://github.com/phracker/MacOSX-SDKs and stick it in /opt/MacOSX10.9.sdk

# 2. Point the cmake compiler at this SDK
export CONDA_BUILD_SYSROOT=/opt/MacOSX10.9.sdk

# 3. Perform the cmake call as specified in whatever install instructions, e.g. for https://github.com/r-barnes/Barnes2020-FillSpillMerge
cmake -D CMAKE_C_COMPILER="/usr/local/Cellar/llvm/10.0.0_3/bin/clang" -D CMAKE_CXX_COMPILER="/usr/local/Cellar/llvm/10.0.0_3/bin/clang++" -DCMAKE_BUILD_TYPE=Release .. 
# be sure to repoint the versioning in the links as necessary

# finish the build, e.g.
make -j 4  # 4 cores