#!/bin/sh

# (C) 2007, Robert Bradshaw, William Hart, William Stein, Michael Abshoff
# (C) 2011, William Hart

PREFIX="/usr/local"
GMP_DIR="/usr/local"
MPFR_DIR="/usr/local"
FLINT_DIR="/usr/local"
SHARED=1
STATIC=1

usage()
{
   echo "Usage: ./configure <options> <args>"
   echo "   where <options> may be"
   echo "     -h display usage information"
   echo "   where <args> may be:"
   echo "     --with-gmp=<path>   Specify location of GMP"
   echo "     --with-mpfr=<path>  Specify location of MPFR"
   echo "     --with-flint=<path> Specify location of FLINT"
   echo "     --prefix=<path>     Specify path to installation location"
   echo "     --disable-shared    Do not build a shared library"
   echo "     --disable-static    Do not build a static library"
   echo "     CC=<name>           Use the C compiler with the given name"
   echo "     AR=<name>           Use the AR library builder with the given name"
   echo "     CFLAGS=<flags>      Pass the given flags to the compiler"
}

until [ -z "$1" ]; do
   case $1 in
      "-h") usage
         exit 0
         ;;
      "--with-gmp="*)
         GMP_DIR=`expr substr $1 13 length $1`
         ;;
      "--with-mpfr="*)
         MPFR_DIR=`expr substr $1 13 length $1`
         ;;
      "--with-flint="*)
         FLINT_DIR=`expr substr $1 14 length $1`
         ;;
      "--prefix="*)
         PREFIX=`expr substr $1 10 length $1`
	 ;;
      "--disable-shared")
         SHARED=0
         ;;
      "--disable-static")
         STATIC=0
         ;;
      "AR="*)
         AR=`expr substr $1 4 length $1`
         ;;
      "CC="*)
         CC=`expr substr $1 4 length $1`
         ;;
      "CFLAGS="*)
         CFLAGS=`expr substr $1 8 length $1`
         ;;
      *) usage
         exit 1
         ;; 
   esac
   shift
done

if [ -d "${GMP_DIR}/lib" ]; then
   GMP_LIB_DIR="${GMP_DIR}/lib"
   GMP_INCLUDE_DIR="${GMP_DIR}/include"
elif [ -d "${MPIR_DIR}/.libs" ]; then
   GMP_LIB_DIR="${MPIR_DIR}/.libs"
   GMP_INCLUDE_DIR="${MPIR_DIR}"
else
   echo "Invalid MPIR directory"
   exit 1
fi

if [ -d "${MPFR_DIR}/lib" ]; then
   MPFR_LIB_DIR="${MPFR_DIR}/lib"
   MPFR_INCLUDE_DIR="${MPFR_DIR}/include"
elif [ -d "${MPFR_DIR}/.libs" ]; then
   MPFR_LIB_DIR="${MPFR_DIR}/.libs"
   MPFR_INCLUDE_DIR="${MPFR_DIR}"
else
   echo "Invalid MPFR directory"
   exit 1
fi

if [ -d "${FLINT_DIR}/lib" ]; then
   FLINT_LIB_DIR="${FLINT_DIR}/lib"
   FLINT_INCLUDE_DIR="${FLINT_DIR}/include"
elif [ -d "${FLINT_DIR}/.libs" ]; then
   FLINT_LIB_DIR="${FLINT_DIR}/.libs"
   FLINT_INCLUDE_DIR="${FLINT_DIR}"
elif [ -e "${FLINT_DIR}/flint.h" ]; then
   FLINT_LIB_DIR="${FLINT_DIR}"
   FLINT_INCLUDE_DIR="${FLINT_DIR}"
else
   echo "${FLINT_DIR}"
   echo "Invalid FLINT directory?"
   exit 1
fi

if [ -d "${FLINT_INCLUDE_DIR}/flint" ]; then
   FLINT_INCLUDE_DIR="${FLINT_INCLUDE_DIR}/flint"
fi

if [ "`uname`" = "Linux" -a "`uname -m`" = "x86_64" ]; then
   ARB_TUNE="-funroll-loops "
elif [ "`uname`" = "Darwin" -a "`uname -m`" = "Power Macintosh" ]; then
   ARB_TUNE=" -funroll-loops "
elif [ "`uname -p`" = "powerpc" ]; then
   ARB_TUNE="-m64 -mcpu=970 -mtune=970 -mpowerpc64 -falign-loops=16 -falign-functions=16 -falign-labels=16 -falign-jumps=16"
elif [ "`uname -m`" = "ia64" ]; then
   # -funroll-loops crashes the build on itanium under GCC-4.2.1, as reported by
   # Kate Minola.
   ARB_TUNE=" "
else
   ARB_TUNE="-funroll-loops "
fi

if [ "`uname`" = "Darwin" ]; then
   ARB_LIB="libarb.dylib"
else
   ARB_LIB="libarb.so"
fi

if [ -z "$CFLAGS" ]; then
   CFLAGS="-O2 -g -ansi -pedantic -Wall"
fi

if [ -z "$CC" ]; then
   CC=gcc
fi

CFLAGS="$CFLAGS $ARB_TUNE"

echo "# This file is autogenerated by ./configure -- do not edit!" > Makefile
echo "" >> Makefile
if [ "$STATIC" = "1" ]; then
    echo "ARB_STATIC=1" >> Makefile
fi
if [ "$SHARED" = "1" ]; then
    echo "ARB_SHARED=1" >> Makefile
fi
echo "ARB_GMP_LIB_DIR=$GMP_LIB_DIR" >> Makefile
echo "ARB_GMP_INCLUDE_DIR=$GMP_INCLUDE_DIR" >> Makefile
echo "ARB_MPFR_LIB_DIR=$MPFR_LIB_DIR" >> Makefile
echo "ARB_MPFR_INCLUDE_DIR=$MPFR_INCLUDE_DIR" >> Makefile
echo "ARB_FLINT_LIB_DIR=$FLINT_LIB_DIR" >> Makefile
echo "ARB_FLINT_INCLUDE_DIR=$FLINT_INCLUDE_DIR" >> Makefile
echo "" >> Makefile
echo "ARB_LIB=$ARB_LIB" >> Makefile
echo "CC=$CC" >> Makefile
echo "CFLAGS=$CFLAGS" >> Makefile
echo "PREFIX=$PREFIX" >> Makefile
echo "" >> Makefile

cat Makefile.in >> Makefile