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#! /bin/bash
# configure script
# note: has nothing to do with GNU autoconf

exec 2> ${LOGFILE:-/dev/null} 3>&1
eval ${LOGFILE:+set -x}


shopt -s nullglob
export LC_ALL=C

CONF_DIR="${0%/*}"
CONF_OS="`uname -s`"
CONF_MACH="`uname -m`"
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HAVE_GINAC=false
HAVE_MCC=false
CONF_BITS=
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DEBUG=false
for arg in "$@" ; do
    case "$arg" in
        --debug)
            DEBUG=true ;;
        --prefix=*)
            CONF_PREFIX="${arg#--prefix=}" ;;
        --host=*)
            CONF_TARGET="${arg#--host=}" ;;
        --with-ginac)
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            HAVE_GINAC=true ;;
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        --with-mcc)
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            HAVE_MCC=true ;;
        --32)
            CONF_BITS="-m32" ;;
        --64)
            CONF_BITS="-m64" ;;
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        -*)
            echo "Warning: $arg is not a valid option." 1>&3 ;;
        *=*)
            eval "$arg" ;;
        *)
            echo "Warning: $arg is not a valid argument." 1>&3 ;;
    esac
done


test=test$$
trap "rm -fr $test* =." 0 1 2 3 15


## look for some programs

findprog() {
    echo -n "looking for $1... " 1>&3
    var="$2"
    set -- ${!var:+"${!var}"} "${@:3}"
    for prog in "$@" ; do
        full="`type -P "$prog"`" && {
            echo "$full" 1>&3
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            printf -v "CONF_$var" "%q" "$full"
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            return 0
        }
    done
    echo "no $@ in your path" 1>&3
    return 1
}
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findlib() {
    echo -n "looking for lib$1... " 1>&3
    for flag in $CONF_LFLAGS ; do
        case "$flag" in
            -L* )
                libfolder=${flag/-L/}
                if [ -f "$libfolder/lib$1.so" ] ; then
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                    path=`realpath "$libfolder/lib$1.so"`
                    echo $path 1>&3
                    printf -v "CONF_$1" "%q" "$path"
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                    return 0
                fi
                if [ -f "$libfolder/lib$1.a" ] ; then
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                    path=`realpath "$libfolder/lib$1.a"`
                    echo $path 1>&3
                    printf -v "CONF_$1" "%q" "$path"
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                    return 0
                fi
            ;;
        esac
    done
    echo "not found" 1>&3
    return 1
}
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addflag() {
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    eval "CONF_$1=\"\${CONF_$1} ${@:2}\""
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}

gnuflags() {
    eval addflag FFLAGS -fdefault-real-8             # default double is 8 byte
    eval addflag FFLAGS -cpp                         # C pre-processor
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    eval addflag FFLAGS -pedantic-errors -std=f2008  # folow f08 strictly
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    eval addflag FFLAGS -J build                     # where to put mods
    eval addflag FFLAGS -Werror -Wall                # make every warning an error
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    eval addflag FFLAGS -Wno-uninitialized
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}

findprog fortran FC  ifort gfortran  || exit 1



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set -- `eval $CONF_FC --version -c | sed '/^$/d;s/([^)]*)//;q' 2>&1`
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case "$1,$2,$3" in
    GNU,Fortran,[123].*)
        echo "Only version >= 4 are supported"
        exit
    ;;
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    GNU,Fortran,4.*)
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    echo "Code optimisation is *not* suported on gfortran 4"
        gnuflags
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        eval addflag $CONF_BITS
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        if $DEBUG ; then
            eval addflag FFLAGS -g -O0
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            eval addflag FFLAGS -ffpe-trap=invalid,overflow
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            eval addflag FFLAGS -fdump-core -fbacktrace
            eval addflag FFLAGS -frange-check
            eval addflag FFLAGS -DDEBUG
        else
            eval addflag FFLAGS -DRELEASE
            eval addflag FFLAGS -march=native -mtune=native
        fi
    ;;
    GNU,Fortran,*)
        gnuflags
        eval addflag FFLAGS -Wno-maybe-uninitialized
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        eval addflag $CONF_BITS
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        if $DEBUG ; then
            eval addflag FFLAGS -g -O0
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            eval addflag FFLAGS -ffpe-trap=invalid,overflow
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            eval addflag FFLAGS -fdump-core -fbacktrace
            eval addflag FFLAGS -fcheck=all -frange-check
            eval addflag FFLAGS -DDEBUG
        else
            eval addflag FFLAGS -DRELEASE -O3
            eval addflag FFLAGS -march=native -mtune=native
        fi
    ;;
    ifort*)
        eval addflag FFLAGS -autodouble
        eval addflag FFLAGS -module build
        eval addflag FFLAGS -fpp
        eval addflag FFLAGS -stand f03
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        eval addflag $CONF_BITS
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        if $DEBUG ; then
            eval addflag FFLAGS -g -O0
            eval addflag FFLAGS -DDEBUG
        else
            eval addflag FFLAGS -DRELEASE -O3
            eval addflag FFLAGS -xHost -fast
        fi
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        if HAVE_GINAC ; then
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            echo "Option --with-ginac is incompatible with ifort, disabling"
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            HAVE_GINAC=false
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        fi
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        if HAVE_MCC ; then
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            echo "Option --with-mcc is incompatible with ifort, disabling"
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            HAVE_MCC=false
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        fi
    ;;
    *)
        echo "Unknown compiler"
        exit
    ;;
esac

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echo -n "extracting the Fortran libraries... " 1>&3

rm -fr $test*

tee $test.f90 << _EOF_ 1>&2
    program test
    integer i
    common /uscore/ i
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    call exit(i)
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    end
_EOF_

while read line ; do
  set -- ${line//[:,()]/ }
  [[ "$1" =~ (/collect2|/ld|^ld)$ ]] && while test $# -gt 1 ; do
    shift
    case "$1" in
    *.o | -lc*)
      ;;
    -l* | -L* | *.a)
      FLDFLAGS+=" $1" ;;
    -Bstatic | -Bdynamic | *.ld)
      FLDFLAGS+=" -Wl,$1" ;;
    /*)
      FLDFLAGS+=" -L$1" ;;
    -rpath*)
      FLDFLAGS+=" -Wl,$1,$2"
      shift ;;
    -dynamic-linker)
      shift ;;
    esac
  done
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done < <(eval $CONF_FC  -v -o $test $test.f90 2>&1)
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echo "ok" 1>&3

eval addflag LFLAGS "$LDFLAGS $CONF_LDFLAGS $FLDFLAGS"



if ( $HAVE_GINAC || $HAVE_MCC ); then
    findprog gcc CC clang gcc || exit 1
    findprog g++ CXX clang++ g++ || exit 1
    eval addflag CFLAGS "-std=c99"

    ## does Fortran append underscores to symbols?

    echo -n "does $CONF_FC append underscores... " 1>&3

    tee $test-c.c << _EOF_ 1>&2
int uscore_ = 95;
int uscore = 59;
_EOF_

    for CONF_BITS in ${CONF_BITS:--m64 -m32} ; do
      eval $CONF_CC $CONF_CFLAGS $CONF_BITS -c $test-c.c 1>&2 || continue
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      eval $CONF_FC  -o $test $test.f90 $test-c.o 1>&2 && break
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    done

    ./$test
    case $? in
    95)
      echo "yes" 1>&3
      CONF_NOUNDERSCORE=0 ;;
    59)
      echo "no" 1>&3
      CONF_NOUNDERSCORE=1 ;;
    *)
      echo "error linking Fortran and C" 1>&3
      exit 1 ;;
    esac

else
    $CONF_CC=
    $CONF_CXX=
    $CONF_CFLAGS=
    $CONF_NOUNDERSCORE=
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fi

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if $HAVE_MCC ; then
    PATH=$PATH:/Applications/Mathematica.app/Contents/MacOS/ findprog mathematica MATH math MathKernel math10 math11


    # Checking Mathematica system id

    echo -n "what is $CONF_MATH SystemID... " 1>&3

    tee $test.m << _EOF_ 1>&2
        Print["SYSID "<>ToString[\$SystemID]];
        Print["INSTDIR "<>ToString[\$InstallationDirectory]];
_EOF_
    $CONF_MATH < $test.m > $test.log
    CONF_MATH_SYS=`cat $test.log | grep "SYSID"   | sed 's/.*SYSID //'`
    CONF_MATH_DIR=`cat $test.log | grep "INSTDIR" | sed 's/.*INSTDIR //'`
    echo  $CONF_MATH_SYS 1>&3


    # Finding mcc
    CONF_COMPAD=$CONF_MATH_DIR/SystemFiles/Links/MathLink/DeveloperKit/$CONF_MATH_SYS/CompilerAdditions/
    PATH=$CONF_COMPAD:$PATH findprog mcc MCC mcc

    echo -n "looking for MLDK directory... " 1>&3
    $CONF_MCC --internals > $test.int
    CONF_MLDK=`cat $test.int | grep "MLDK Directory" | cut -f2 -d":"`
    echo $CONF_MLDK 1>&3

    arch=`cat $test.int | grep "Library Bit Type:" | cut -f2 -d":"` ; \
    CONF_MCC_CFLAGS=`cat $test.int | grep "Compile Flags$arch:" | cut -f2 -d":"`
    CONF_MCC_LFLAGS=`cat $test.int | grep "Linker Libraries" | cut -f2 -d":"`
    cat $test.int | grep "Linker Libraries" | cut -f2 -d":"
    if [ ! -z $CONF_BITS ]; then
        if [ "$CONF_BITS" -ne "$MCC_BITS" ]; then
            echo "mcc wants $MCC_BITS ($arch), $CONF_BITS selected." 1>&3
            exit 1
        fi
    fi

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    if [[ $CONF_MCC_LFAGS == *"uuid"* ]]; then
        if ! findlib uuid UUID ; then
            echo -n "improvising uuid... " 1>&3
            CONF_MLIBDIR=$CONF_MATH_DIR/SystemFiles/Libraries/$CONF_MATH_SYS/
            if [ -f $CONF_MLIBDIR/libuuid.a ]; then
                CONF_MCC_LFLAGS="-L$CONF_MLIBDIR $CONF_MCC_LFLAGS"
                echo "okay" 1>&3
            else
                echo "failed" 1>&3
                exit 1
            fi
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        fi
    fi

    # Finding MPREP
    PATH=$CONF_COMPAD:$PATH findprog mprep MPREP mprep

    ## can we do MathLink compilations
    echo -n "do we have working MathLink... " 1>&3
    tee $test.tm << _EOF_ 1>&2
:Begin:
:Function: test
:Pattern: Test[i_Integer]
:Arguments: {i}
:ArgumentTypes: {Integer}
:ReturnType: Integer
:End:

#include "mathlink.h"

static int test(const int i) {
  return i + 1;
}

int main(int argc, char **argv) {
  return MLMain(argc, argv);
}
_EOF_
    $CONF_MPREP $test.tm > $test.tm.c
    $CONF_CC $CONF_MCC_CFLAGS $CONF_CFLAGS -c $test.tm.c
    $CONF_CC -o $test.math $test.tm.o $CONF_MCC_LFLAGS
    test -x $test.math && {
        echo "yes" 1>&3
        CONF_ML=1
    } || {
        echo "no" 1>&3
        CONF_ML=0
    }
fi
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echo "creating makefile" 1>&3

CONF_LD=$CONF_FC

cat  > makefile <<EOF
# Generated through $0 $@ on `date` by `whoami`

AR=ar rcs
FC=$CONF_FC
CC=$CONF_CC
CXX=$CONF_CXX
LD=$CONF_LD
MPREP=$CONF_MPREP

FFLAGS=$CONF_FFLAGS
CFLAGS=$CONF_CFLAGS
LFLAGS=$CONF_LFLAGS
MCFLAGS=$CONF_MCC_CFLAGS
MLFLAGS=$CONF_MCC_LFLAGS


files=globals.o ieps.o utils.o shuffle.o maths_functions.o mpl_module.o gpl_module.o GPL.o
objects = \$(addprefix build/,\$(files))


all: libgpl.a ${CONF_MPREP:+gpl} eval test

libgpl.a:\$(objects)
		@echo "AR \$@"
		@\$(AR) \$@ $^

# rules to make object files into /build
build/%.o: src/%.f90
		@echo "F90 \$@"
		@\$(FC) \$(FFLAGS) -c $< -o \$@

build/%.o: src/%.cpp
		@echo "C++ \$@"
		@\$(CC) -c $<  -o \$@

EOF

$HAVE_MCC && cat >> makefile <<EOF
build/%.tm.c: src/%.tm
		@echo "MPREP \$@"
		@\$(MPREP) \$< -o \$@

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build/mathlink.o: build/mathlink.tm.c
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		@echo "CC \$<"
		@\$(CC) \$(MCFLAGS) \$(CFLAGS) -o \$@ -c \$<

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gpl: build/mathlink.o libgpl.a
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		@echo "LD \$@"
		@\$(LD)  $< libgpl.a -o \$@ \$(LFLAGS) \$(MLFLAGS)
EOF

cat  >> makefile <<EOF


eval: libgpl.a build/eval.o
		@echo "LD \$@"
		@\$(LD) -o \$@ build/eval.o -L. -lgpl \$(LFLAGS)


test: \$(objects) ${CONF_GINAC:+build/ginac.o} build/test.o
		@echo "LD \$@"
		@\$(LD) -o \$@ $^ \$(LFLAGS)

check: test
		./$<

clean:
		@rm -f build/*.o build/*.mod build/*.c build/mcc.internals*
		@rm -f test eval libgpl.a gpl

distclean:
		@rm -f build/*.o build/*.mod build/*.c build/mcc.internals*
		@rm -f test eval libgpl.a gpl
		@rm -f makefile
EOF