configure

#!/bin/bash
## MCMCLib config script

function print_help
{ 
    echo "" ;
    echo -e "\x1B[32mMCMCLib Configuration\033[0m" >&2 ;
    echo "";
    echo -e "Main options:" >&2 ;
    echo "  -c    Code coverage build" ;
    echo "        (default: disabled)" ;
    echo "  -d    Developmental build" ;
    echo "        (default: disabled)" ;
    echo "  -f    Floating-point number type" ;
    echo "        (default: double)" ;
    echo "  -g    Debugging build (optimization flags set to -O0 -g)" ;
    echo "        (default: disabled)" ;
    echo "  -h    Print help" ;
    echo "  -i    Install path (default: current directory)" ;
    echo "          Example: /usr/local" ;
    echo "  -l    Choice of linear algebra library" ;
    echo "        Examples: -l arma or -l eigen" ;
    echo "  -m    Specify the BLAS and Lapack libraries to link against" ; 
    echo "          Examples: -m \"-lopenblas\" or -m \"-framework Accelerate\"" ;
    echo "  -o    Compiler optimization options" ;
    echo "        (default: -O3 -march=native -ffp-contract=fast -flto -DARMA_NO_DEBUG)" ;
    echo "  -p    Enable OpenMP parallelization features" ;
    echo "        (default: disabled)" ;
    echo "" ;
    echo "Special options:" ;
    echo "  --header-only-version    Generate a header-only version of MCMCLib" ;
    echo "" ;
}

while getopts hcdgf:i:l:m:o:pr:-: option; do
    case "${option}" in
        -)
            case "${OPTARG}" in
                header-only-version)
                    MCMC_GEN_NEW_HEADERS="y";;
                ?) print_help; exit 2;;
            esac;;
        h) print_help; exit 2;;
        c) MCMC_COVERAGE_BUILD="y";;
        d) MCMC_DEV_BUILD="y";;
        f) MCMC_FPN_TYPE=${OPTARG};;
        g) MCMC_DEBUG_BUILD="y";;
        i) MCMC_INSTALL_PATH=${OPTARG};;
        l) MCMC_LINEAR_ALG_LIB=${OPTARG};;
        m) MCMC_MATRIX_OPS=${OPTARG};;
        o) MCMC_OPT=${OPTARG};;
        p) MCMC_PARALLEL="y";;
        r) MCMC_R_BUILD=${OPTARG};;
        ?) print_help; exit 2;;
    esac
done

if [ -z ${CXX+x} ]; then 
    CXX=g++
fi

# get working directory
WDIR=${PWD}

# compiler and system checks
ARCH=$(uname -m)
IS_ARM=$(echo $ARCH | grep -i -c "arm")
IS_DARWIN=$($CXX -dumpmachine 2>&1 | grep -i -c "darwin")
GCC_COMPILER=$($CXX --version 2>&1 | grep -i -c -E "gcc")
CLANG_COMPILER=$($CXX --version 2>&1 | grep -i -c -E "clang")
APPLE_COMPILER=$($CXX --version 2>&1 | grep -i -c -E 'apple llvm')

# generate header-only version of MCMCLib

if [[ "${MCMC_GEN_NEW_HEADERS}" == "y" ]]; then
    rm -rf ./header_only_version
    mkdir ./header_only_version

    cp -rf ./include/* ./header_only_version/

    #

    declare -a DIRS=("mcmc")

    for dir_ in "${DIRS[@]}"; do
        cd "$WDIR"/header_only_version/"$dir_"
        file_names=`ls *.hpp`

        for file_ in $file_names; do
            file_=${file_%.hpp}

            #

            if [[ "${file_}" == "mcmc_algos" ]]; then
                continue
            fi

            if [ "$IS_DARWIN" -eq "1" ]; then # syntax for inplace replacement on macOS is a bit different
                sed -i '' -e "s|#endif|//\n|" $file_.hpp
            else
                sed -i -e "s|#endif|//\n|" $file_.hpp
            fi

            sed -e '1,/\[MCMC_BEGIN\]/ d' $WDIR/src/"$file_".cpp | sed -e "s|mcmclib_inline|inline|" -e "s|mcmc::||" >> "$file_".hpp

            echo -e "\n#endif" >> "$file_".hpp
        done
    done

    exit 0
fi

#

echo ""
echo -e "\x1B[32mMCMCLib Configuration\033[0m" >&2 ;
echo ""

declare -a MCMC_MATLIB_DIRS=("${WDIR}/../../include" "/usr/include" "/usr/local/include" "/opt/include" "/opt/local/include")

# look for linear algebra library header files
if [[ "${MCMC_LINEAR_ALG_LIB}" == "arma" ]]; then
    if [ -z ${ARMA_INCLUDE_PATH+x} ]; then 
        
        ARMA_INCLUDE_PATH=

        for i in "${MCMC_MATLIB_DIRS[@]}"; do
            if [ -f "$i"/armadillo ]; then 
                ARMA_INCLUDE_PATH="$i"
                break
            fi
        done

        if [[ $ARMA_INCLUDE_PATH == "" ]]; then
            echo -e "  \x1B[31m- error: cannot find the Armadillo library header files.\033[0m" >&2 ;
            echo -e "  \x1B[31m         Please set the ARMA_INCLUDE_PATH environment variable.\033[0m" >&2 ;
            echo -e "  \x1B[31m         Exiting.\033[0m" >&2 ;
            echo ""
            exit 1
        fi
    fi

    MCMC_CXX_STD="-std=c++11"
    MCMC_MATLIB_FLAGS="-DMCMC_ENABLE_ARMA_WRAPPERS -DARMA_NO_DEBUG"
    MCMC_MATLIB_INCLUDE_PATH=$ARMA_INCLUDE_PATH
elif [[ "${MCMC_LINEAR_ALG_LIB}" == "blaze" ]]; then
    # MCMC_CXX_STD="-std=c++14"
    # MCMC_MATLIB_FLAGS="-DMCMC_ENABLE_BLAZE_WRAPPERS"
    # MCMC_MATLIB_INCLUDE_PATH=$BLAZE_INCLUDE_PATH

    echo -e "  \x1B[31m- error: Blaze not yet supported. Exiting.\033[0m" >&2 ;
    echo ""
    exit 1
elif [[ "${MCMC_LINEAR_ALG_LIB}" == "eigen" ]]; then
    if [ -z ${EIGEN_INCLUDE_PATH+x} ]; then 
        
        EIGEN_INCLUDE_PATH=

        for i in "${MCMC_MATLIB_DIRS[@]}"; do
            if [ -f "$i"/Eigen ]; then 
                EIGEN_INCLUDE_PATH="$i"
                break
            fi
        done

        if [[ $EIGEN_INCLUDE_PATH == "" ]]; then
            echo -e "  \x1B[31m- error: cannot find the Eigen library header files.\033[0m" >&2 ;
            echo -e "  \x1B[31m         Please set the EIGEN_INCLUDE_PATH environment variable.\033[0m" >&2 ;
            echo -e "  \x1B[31m         Exiting.\033[0m" >&2 ;
            echo ""
            exit 1
        fi
    fi

    MCMC_CXX_STD="-std=c++14"
    MCMC_MATLIB_FLAGS="-DMCMC_ENABLE_EIGEN_WRAPPERS"
    MCMC_MATLIB_INCLUDE_PATH=$EIGEN_INCLUDE_PATH
else
    echo -e "  \x1B[31m- error: unrecognized linear algebra library.\033[0m" >&2 ;
    echo ""
    exit 1
fi

# set build and optimization flags

if [[ "${MCMC_COVERAGE_BUILD}" == "y" ]]; then 
    if [ "$GCC_COMPILER" -eq "1" ]; then
        MCMC_OPT_FLAGS="-g -O0 --coverage -fno-inline -fno-inline-small-functions -fno-default-inline"
    else # clang:
        MCMC_OPT_FLAGS="-g -O0 --coverage -fno-inline"
    fi
elif [[ "${MCMC_DEBUG_BUILD}" == "y" ]]; then
    MCMC_OPT_FLAGS="-O0 -g"
else
    if [[ "${MCMC_OPT}" == "" ]]; then
        MCMC_OPT_FLAGS="-O3 -ffp-contract=fast -flto -DNDEBUG"

        if [ "$IS_ARM" -eq "1" ]; then
            MCMC_OPT_FLAGS="-mcpu=native ${MCMC_OPT_FLAGS}"
        else
            # assumes x86
            MCMC_OPT_FLAGS="-march=native ${MCMC_OPT_FLAGS}"
        fi
    else
        MCMC_OPT_FLAGS="${MCMC_OPT}"
    fi

    if [[ "${MCMC_R_BUILD}" != "" ]]; then
        MCMC_OPT_FLAGS="${MCMC_OPT_FLAGS} -DUSE_RCPP_ARMADILLO"
    fi

    if [[ "${MCMC_PARALLEL}" == "y" ]]; then
        MCMC_OPT_FLAGS="${MCMC_OPT_FLAGS} -fopenmp"
    fi
fi

MCMC_WARN_FLAGS="-Wall"

# floating-point number type

if [[ "${MCMC_FPN_TYPE}" == "" ]]; then
    MCMC_FPN_TYPE="double"
fi

# shared library name and install path

MCMC_SHLIB_NAME="libmcmc.so"

if [[ "${MCMC_INSTALL_PATH}" == "" ]]; then
    MCMC_INSTALL_PATH="${WDIR}"
    MCMC_INSTALL_LIB_PATH="${WDIR}"
else
    MCMC_INSTALL_LIB_PATH="${MCMC_INSTALL_PATH}/lib"
fi

if [[ $OSTYPE == darwin* ]] ; then

    MCMC_SHLIB_FLAGS="-dynamiclib -install_name ${MCMC_INSTALL_LIB_PATH}/${MCMC_SHLIB_NAME} -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress"
    MCMC_BLAS_LAPACK="-framework Accelerate"

elif [[ $OSTYPE == *linux* ]] ; then

    MCMC_OPT_FLAGS="-fPIC ${MCMC_OPT_FLAGS}"
    MCMC_SHLIB_FLAGS="-fPIC -shared -L${MCMC_INSTALL_LIB_PATH} -Wl,-Bsymbolic-functions -Wl,-z,relro"

    MCMC_BLAS_LAPACK="-lblas -llapack"
else
    MCMC_BLAS_LAPACK="-lblas -llapack"
fi

if [[ !(-z ${MCMC_MATRIX_OPS+x}) ]]; then
    MCMC_BLAS_LAPACK="${MCMC_MATRIX_OPS}"
fi

if [ "$IS_DARWIN" -eq "1" ] && [ "$GCC_COMPILER" -eq "1" ]; then
    MCMC_OPT_FLAGS="-Wa,-q ${MCMC_OPT_FLAGS}"
fi

# final optimization checks

if [[ "${MCMC_COVERAGE_BUILD}" == "y" ]]; then 
    MCMC_SHLIB_FLAGS="--coverage ${MCMC_SHLIB_FLAGS}"
else
    MCMC_SHLIB_FLAGS="${MCMC_OPT_FLAGS} ${MCMC_SHLIB_FLAGS}"
fi

#
# final print:

echo "Summary:"

echo "  - OS:            ${OSTYPE}"
echo "  - Arch:          ${ARCH}"
echo "  - C++ compiler:  ${CXX}"

if [[ "${MCMC_DEV_BUILD}" == "y" ]]; then
    echo "  - Build version: development"
elif [[ "${MCMC_COVERAGE_BUILD}" == "y" ]]; then
    echo "  - Build version: coverage"
elif [[ "${MCMC_DEBUG_BUILD}" == "y" ]]; then
    echo "  - Build version: debug"
elif [[ "${MCMC_R_BUILD}" != "" ]]; then
    echo "  - Build version: RcppArmadillo"
else
    echo "  - Build version: release"
fi

echo ""

echo "  - MCMC_LINEAR_ALG_LIB set to: ${MCMC_LINEAR_ALG_LIB}"
echo "  - MCMC_MATLIB_INCLUDE_PATH set to:"
echo "    ${MCMC_MATLIB_INCLUDE_PATH}"
echo "  - BLAS and Lapack libraries set to:"
echo "    ${MCMC_BLAS_LAPACK}"

echo ""

if [[ "${MCMC_PARALLEL}" == "y" ]]; then
    echo -e "  - OpenMP features: \x1B[32menabled\033[0m" >&2 ;
else
    echo -e "  - OpenMP features: \x1B[31mdisabled\033[0m" >&2 ;
fi

echo "  - floating-point number type: ${MCMC_FPN_TYPE}"
echo "  - optimization flags:"
echo "    ${MCMC_OPT_FLAGS}"

echo ""

echo "  - MCMCLib install path:"
echo "    ${MCMC_INSTALL_PATH}"

echo ""
echo "  - Additional notes:"

if [ "$APPLE_COMPILER" -eq "1" ] && [[ "${MCMC_PARALLEL}" == "y" ]]; then
    echo -e "    \x1B[31m- You have enabled OpenMP, but your C++ compiler does not\033[0m" >&2 ;
    echo -e "    \x1B[31m  support this feature!\033[0m" >&2 ;
fi

if [ "$IS_DARWIN" -eq "1" ] && [ "$GCC_COMPILER" -eq "1" ]; then
    echo "    - To enable AVX features, your compiler will use the Apple LLVM"
    echo "      assembler"
fi

echo ""
echo -e "\x1B[32mConfiguration completed. Creating Makefile... \c\033[0m" >&2 ;

sed -e "s|@CXX@|${CXX}|" \
    -e "s|@MCMC_CXX_STD@|${MCMC_CXX_STD}|" \
    -e "s|@MCMC_MATLIB_FLAGS@|${MCMC_MATLIB_FLAGS}|" \
    -e "s|@MCMC_MATLIB_INCLUDE_PATH@|${MCMC_MATLIB_INCLUDE_PATH}|" \
    -e "s|@MCMC_BLAS_LAPACK@|${MCMC_BLAS_LAPACK}|" \
    -e "s|@MCMC_WARN_FLAGS@|${MCMC_WARN_FLAGS}|" \
    -e "s|@MCMC_OPT_FLAGS@|${MCMC_OPT_FLAGS}|" \
    -e "s|@MCMC_FPN_TYPE@|${MCMC_FPN_TYPE}|" \
    -e "s|@MCMC_SHLIB_NAME@|${MCMC_SHLIB_NAME}|" \
    -e "s|@MCMC_SHLIB_FLAGS@|${MCMC_SHLIB_FLAGS}|" \
    -e "s|@MCMC_INSTALL_PATH@|${MCMC_INSTALL_PATH}|" \
    Makefile.in > Makefile

echo -e "\x1B[32mdone.\033[0m" >&2 ;
echo ""