configure

#!/bin/sh

set -eu

pkg_cppflags=""
pkg_cxxflags='$(SHLIB_OPENMP_CXXFLAGS)'
pkg_libs='$(SHLIB_OPENMP_CXXFLAGS)'

case "$(uname -s)" in
  Darwin)
    pkg_cxxflags=""
    pkg_libs=""
    libomp_prefix=""

    if command -v brew >/dev/null 2>&1; then
      libomp_prefix="$(brew --prefix libomp 2>/dev/null || true)"
    fi

    if [ -z "${libomp_prefix}" ]; then
      for prefix in /opt/homebrew/opt/libomp /usr/local/opt/libomp; do
        if [ -f "${prefix}/include/omp.h" ] && [ -f "${prefix}/lib/libomp.dylib" ]; then
          libomp_prefix="${prefix}"
          break
        fi
      done
    fi

    if [ -n "${libomp_prefix}" ] && [ -f "${libomp_prefix}/include/omp.h" ] && [ -f "${libomp_prefix}/lib/libomp.dylib" ]; then
      pkg_cppflags="-I${libomp_prefix}/include"
      pkg_cxxflags="-Xclang -fopenmp"
      pkg_libs="${libomp_prefix}/lib/libomp.dylib"
    fi
    ;;
esac

sed \
  -e "s|@PKG_CPPFLAGS@|${pkg_cppflags}|g" \
  -e "s|@PKG_CXXFLAGS@|${pkg_cxxflags}|g" \
  -e "s|@PKG_LIBS@|${pkg_libs}|g" \
  src/Makevars.in > src/Makevars