configure

#!/bin/bash

set -o errexit
set -o nounset

isdef() {
    tmp1=/tmp/openmx.$$.cpp
    tmp2=/tmp/openmx.$$.out
    trap 'rm -f $tmp1 $tmp2' EXIT
    cat >$tmp1 <<EOF
int main()
{
#ifndef $1
crash me
#endif
	; return 0;
}
EOF
    $CXX -c $tmp1 -o $tmp2 > /dev/null 2>&1
}

compareVersions() {
  typeset    IFS='.'
  typeset -a v1=( $1 )
  typeset -a v2=( $2 )
  typeset    n diff

  for (( n=0; n<4; n+=1 )); do
    diff=$((v1[n]-v2[n]))
    if [ $diff -ne 0 ] ; then
      [ $diff -le 0 ] && echo '-1' || echo '1'
      return
    fi
  done
  echo  '0'
}

: ${R_HOME:=`R RHOME`}
if test -z "${R_HOME}"; then 
   echo "could not determine R_HOME" 
   exit 1 
fi 

REXEC=${R_HOME}/bin/R

eval $(grep R_HOME_DIR $REXEC | head -1)
Makeconf=$(find $R_HOME_DIR/etc -print | egrep 'Makeconf$' )
echo "Change default C/C++ compiler and default compile flags by editing $Makeconf"

CXX=$($REXEC CMD config CXX)

COMPILER_CXXFLAGS=
COMPILER_LDFLAGS=
arch_CXXFLAGS=
arch_LDFLAGS=
OPENMP_CXXFLAGS=
OPENMP_LDFLAGS=
xcheck_CXXFLAGS=
xcheck_LDFLAGS=

if isdef __clang__; then
    cxx_type=clang
elif isdef __llvm__; then
    cxx_type=llvm
elif isdef __GNUC__; then
    cxx_type=gcc
else
    echo "Compiler unrecognized:"
    $CXX --version
    exit 1
fi

cxx_version=$($CXX -dumpversion | awk -F '.' '{print $1 "." $2}')

if [ "$cxx_type" = gcc ]; then
    COMPILER_CXXFLAGS="-Wall -Wextra -Wno-unknown-pragmas -Wno-unused-parameter -Wvla -Wno-unused-local-typedefs"
    if [ $(compareVersions $cxx_version 4.9) -gt -1 ]; then
	COMPILER_CXXFLAGS="$COMPILER_CXXFLAGS -fdiagnostics-color=auto"
	COMPILER_LDFLAGS="$COMPILER_LDFLAGS"
	xcheck_CXXFLAGS="-fsanitize=undefined"
	xcheck_LDFLAGS="-fsanitize=undefined"
    fi
    if [ "${OPENMP-yes}" = yes ]; then
	OPENMP_CXXFLAGS="-fopenmp"
	OPENMP_LDFLAGS="-fopenmp"
    fi
fi

host_cpu=$(uname -p)
if [ "x$host_cpu" = xunknown ]; then
  # tanglu 1 has the machine architecture here
  host_cpu=$(uname -m)
fi
case "$host_cpu" in
    *86_64) omx_arch=x86_64 ;;
    *86) omx_arch=x86 ;;
    *)
	echo "Host arch is not recognized: ${host_cpu}"
	exit 1
	;;
esac

npsol_dir='inst/npsol'

if [ -r inst/npsol/checksum ]; then
    os=$(uname -s)
    case "$os" in
	*Linux)
	    omx_os=linux
	    pick="linux/${omx_arch}/gcc${cxx_version}"
	    npsol_url="http://openmx.psyc.virginia.edu/packages/npsol/$pick/libnpsol.a"
	    if [ ! -f src/libnpsol.a ]; then
		curl -s -o src/libnpsol.a "$npsol_url"
	    fi
	    want=$(grep "$pick" inst/npsol/checksum | cut -f1 -d' ')
	    got=$(sha1sum src/libnpsol.a | cut -f1 -d' ')
	    if [ "x$got" != "x$want" ]; then
		rm -f src/libnpsol.a
		echo "WARNING: Failed to download libnpsol.a from $npsol_url"
	    else
		npsol_library="src"
	    fi
	    ;;
	*Darwin)
	    omx_os=osx
	    arch_LDFLAGS="-mmacosx-version-min=10.4"
	    arch_CXXFLAGS="-mmacosx-version-min=10.4"
	    npsol_library="${npsol_dir}/osx"
	    ;;
	*)
	    echo "Host os is not recognized: $os"
	    exit 1
	    ;;
    esac
fi

echo "### Generated $(date)" > src/Makevars
echo >> src/Makevars

if [ ! -e inst/no-npsol -a -n "${npsol_library+1}" ]; then
    npsol_file="${npsol_library}/libnpsol.a"
    if [ ! -f "$npsol_file" ]; then
	echo "$npsol_file not found"
	exit 1
    else
	echo "NPSOL_LDFLAGS=-L../${npsol_library} -lnpsol" >> src/Makevars
    fi
fi

if [ $($REXEC --slave --vanilla -e 'cat(suppressWarnings(require("nloptr", quietly=TRUE)) && packageVersion("nloptr") >= "1.0.5")') = TRUE ]; then
  echo "
NLOPT_CXXFLAGS=$($REXEC --slave --vanilla -e 'suppressPackageStartupMessages(require(nloptr)); cat("-DHAS_NLOPT", nloptr:::CFlags())')
NLOPT_LDFLAGS=$($REXEC  --slave --vanilla -e 'suppressPackageStartupMessages(require(nloptr)); cat(nloptr:::LdFlags())')
" >> src/Makevars
fi

echo "ARCH_SPECIFIC_LINKER_FLAGS=$arch_LDFLAGS" >> src/Makevars
echo "ARCH_SPECIFIC_COMPILER_FLAGS=$arch_CXXFLAGS" >> src/Makevars
echo "COMPILER_CXXFLAGS=$COMPILER_CXXFLAGS" >> src/Makevars
echo "COMPILER_LDFLAGS=$COMPILER_LDFLAGS" >> src/Makevars
echo "OPENMP_CXXFLAGS=$OPENMP_CXXFLAGS" >> src/Makevars
echo "OPENMP_LDFLAGS=$OPENMP_LDFLAGS" >> src/Makevars
echo "xcheck_CXXFLAGS=$xcheck_CXXFLAGS" >> src/Makevars
echo "xcheck_LDFLAGS=$xcheck_LDFLAGS" >> src/Makevars
echo >> src/Makevars
echo "# ---- appending Makevars.in ----" >> src/Makevars
echo >> src/Makevars
cat src/Makevars.in >> src/Makevars