configure

#!/usr/bin/env bash
set -eu

while [[ $# -gt 0 ]]; do
    case $1 in
        --with-dragonegg)
            USE_DRAGONEGG="true"
            shift
            ;;
        --with-flang)
            shift
            ;;
        *)
            echo "Unknown argument $1"
            exit 1
            ;;
    esac
done

rm -f tools/fortran.mk

function configure_emfc {
    EMFC_ROOT=`dirname ${EMFC}`
    if [ -f "${FORTRAN_WASM_LIB-}" ]; then
        EMFC_FLIB=${FORTRAN_WASM_LIB}
    elif [ -f "${EMFC_ROOT}/../../wasm/lib/libFortranRuntime.a" ]; then
        EMFC_FLIB=`realpath ${EMFC_ROOT}/../../wasm/lib/libFortranRuntime.a`
    else
        echo "Error: Can't find Fortran runtime library."
        echo "Set FORTRAN_WASM_LIB to the location of libFortranRuntime.a,"\
            "or unset EMFC to build LLVM flang from source."
        exit 1
    fi
    echo "Found Fortran runtime library: ${EMFC_FLIB}"
    cat << EOF > tools/fortran.mk
EMFC = ${EMFC}
FORTRAN_WASM_LIB = ${EMFC_FLIB}
FORTRAN_WASM_LDADD = ${EMFC_FLIB}
.PHONY: clean-tools
clean-tools:
	@
EOF
}

if [ -n "${USE_DRAGONEGG-}" ]; then
    # Build dragonegg from source
    ln -s fortran-dragonegg.mk tools/fortran.mk
elif [ -n "${EMFC-}" ]; then
    if [ -f "${EMFC-}" ]; then
        echo "Found Fortran compiler: ${EMFC}"
        configure_emfc
    else
        echo "Error: Can't find Fortran compiler, check EMFC value."
        exit 1
    fi
else
    # Build LLVM flang from source
    ln -s fortran-flang.mk tools/fortran.mk
fi