FlowCodeUnmixRcpp/configure at master · DrCytometer/FlowCodeUnmixRcpp · GitHub

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#!/bin/sh

# configure -- FlowCodeUnmixRcpp
#
# On macOS: detects or installs Homebrew + libomp, then enables OpenMP.
# On Linux: OpenMP is handled natively by GCC; no detection needed.
# On Windows: configure is not run; src/Makevars.win is used directly.

OPENMP_CPPFLAGS=""
OPENMP_LIBS=""
FLIBS_LINE=""

if [ "$(uname)" = "Darwin" ]; then

  # --- Ensure Homebrew is present ---
  if ! command -v brew >/dev/null 2>&1; then
    if [ -t 1 ]; then
      echo "configure: Homebrew not found -- installing Homebrew"
      /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
      for BREW_BIN in /opt/homebrew/bin /usr/local/bin; do
        if [ -f "${BREW_BIN}/brew" ]; then
          export PATH="${BREW_BIN}:${PATH}"
          break
        fi
      done
    else
      echo "configure: Homebrew not found and session is non-interactive -- cannot auto-install"
      echo "configure: to enable OpenMP, open a terminal and run:"
      echo "configure:   /bin/bash -c \"\$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)\""
      echo "configure:   brew install libomp"
      echo "configure: then reinstall the package"
      echo "configure: building without OpenMP (single-threaded) for now"
    fi
  fi

  # --- Ensure libomp is present ---
  LIBOMP_DIR=""
  for HOMEBREW_PREFIX in /opt/homebrew /usr/local; do
    if [ -d "${HOMEBREW_PREFIX}/opt/libomp" ]; then
      LIBOMP_DIR="${HOMEBREW_PREFIX}/opt/libomp"
      break
    fi
  done

  if [ -z "${LIBOMP_DIR}" ] && command -v brew >/dev/null 2>&1; then
    if [ -t 1 ]; then
      echo "configure: libomp not found -- installing via Homebrew"
      brew install libomp
      for HOMEBREW_PREFIX in /opt/homebrew /usr/local; do
        if [ -d "${HOMEBREW_PREFIX}/opt/libomp" ]; then
          LIBOMP_DIR="${HOMEBREW_PREFIX}/opt/libomp"
          break
        fi
      done
    else
      echo "configure: libomp not found and session is non-interactive -- cannot auto-install"
      echo "configure: to enable OpenMP, open a terminal and run: brew install libomp"
      echo "configure: then reinstall the package"
      echo "configure: building without OpenMP (single-threaded) for now"
    fi
  fi

  if [ -n "${LIBOMP_DIR}" ]; then
    OPENMP_CPPFLAGS="-Xpreprocessor -fopenmp -I${LIBOMP_DIR}/include"
    OPENMP_LIBS="-L${LIBOMP_DIR}/lib -lomp"
    echo "configure: OpenMP enabled using libomp at ${LIBOMP_DIR}"
    echo "configure: note -- keep n_threads conservative to avoid conflict with Accelerate BLAS"
  else
    echo "configure: building without OpenMP (single-threaded C++ only)"
  fi

else
  # Linux: gfortran expected; include $(FLIBS). OpenMP via GCC natively.
  FLIBS_LINE='$(FLIBS)'
fi

sed \
  -e "s|@OPENMP_CPPFLAGS@|${OPENMP_CPPFLAGS}|g" \
  -e "s|@OPENMP_LIBS@|${OPENMP_LIBS}|g" \
  -e "s|@FLIBS_LINE@|${FLIBS_LINE}|g" \
  src/Makevars.in > src/Makevars

exit 0