#!/usr/bin/env bash
# Test for SAGE_LOCAL in the best possible way. 
if [ "x$SAGE_LOCAL" = "x" ]; then
   echo "SAGE_LOCAL undefined ... exiting";
   echo "Maybe run 'sage -sh'?"
   exit 1
fi

# Force an exit on all errors. However, not it will be desirable to unset this 
# sometimes, as you might want to test for a particular error and exit with 
# a message. You can't do that with 'set -e'. So use 'set +e' to unset it
set -e 

# Compile for 64-bit if SAGE64 is set to 'yes'. This is documented, so only 'yes' will do.
if [ "x$SAGE64" = "xyes" ]; then
   CFLAGS="$CFLAGS -m64 "
fi

# If SAGE_DEBUG is set either unset (the default), set to '1', 'yes',  or 'TRUE'
# then build with debugging information. Otherwise, don't add debugging information.

# Since both the Sun and GNU compilers accept -g to give debugging information
# there is no need to do anything specific to one compiler or the other. 

if [ "x$SAGE_DEBUG" = "x" -o "x$SAGE_DEBUG" = "x1" ] ; then
  echo "Code will be built with debugging information present. Set 'SAGE_DEBUG' to '0' if you don't want that."
  CFLAGS="$CFLAGS -g "
  CXXFLAGS="$CXXFLAGS -g "
elif [ "x$SAGE_DEBUG" = "xyes" -o "x$SAGE_DEBUG" = "xTRUE" ] ; then
  echo "Code will be built with debugging information present. Set 'SAGE_DEBUG' to '0' if you don't want that."
  CFLAGS="$CFLAGS -g "
  CXXFLAGS="$CXXFLAGS -g "
fi 

# Display all warnings from the compilers. Do so in a way that works for 
# both The GNU Compiler Collection (gcc, g++, gfortran), as well as for 
# Sun's compilers. Since the compilers use different methods, the compiler
# must be tested. 

# gcc/g++/gfortran uses -Wall to show this. 
# The best flags for the Sun compilers are not known, but my best guess 
# is below. 

if "$CC" -flags 2>&1 | grep -i sun  ;  then
  CFLAGS="$CFLAGS -xtransition -erroff=none "
  SUN_COMPILER=1
elif "$CC" --version | grep 'GCC'  ; then 
  CFLAGS="$CFLAGS -Wall "
  GNU_COMPILER=1
else
  echo "The spkg-install file can't work out what C compiler you are using"
  echo "No flags will be added to show extra warnings while compiling C"
fi 

# Determine if the C++ compiler is the Sun or GNU compiler 
# Add appropiate flag(s) to show all warnings.
if "$CXX" -flags 2>&1 | grep -i sun  ;  then
  CXXFLAGS="$CXXFLAGS -xtransition -erroff=none "
  SUN_COMPILER=1
elif "$CXX" --version | grep 'GCC'  ; then 
  CXXFLAGS="$CXXFLAGS -Wall "
  GNU_COMPILER=1
else
  echo "The spkg-install file can't work out what C++ compiler you are using"
  echo "No flags will be added to show extra warnings while compiling C++"
fi 

# Determine if the Fortran compiler is the Sun or GNU compiler 
# Add appropiate flag(s) to show all warnings.
# Until I know exactly how a user is supposed to specify that, I'll leave that. 
# In any case, fortran is not used in lcalc. 

# Checks that the user is not mixing the Sun and GNU compilers. This problem
# has been seen on code built with the aid of SCons, but in general could 
# happen with any code if the user has specified a C compiler but not a C++ one. 

if [ "x$SUN_COMPILER" = "x1" -a "x$GNU_COMPILER" = "x1" ] ; then
  echo "You are mixing the Sun and GNU C/C++ compilers" 
  echo "Such a combination will lead to problems. Check CC and CXX carefully."
  echo "Exiting ..."
  exit 1
fi

cd src

if [ `uname` = "SunOS" ]; then
    LCALC_LIBS="-lpari -lmpfr -lgmpxx -lgmp -liberty"
else
    LCALC_LIBS="-lpari -lmpfr -lgmpxx -lgmp"
fi 

export CC CXX CFLAGS CXXFLAGS LCALC_LIBS

echo "Building Rubinstein's lcalc program using CC=$CC"
echo "                                          CCX=$CXX"
echo "                                          CFLAGS=$CFLAGS"
echo "                                          CXXFLAGS=$CXXFLAGS"
echo "                                          LCALC_LIBS=$LCALC_LIBS"

# disable Cygwin build for now
if [ `uname` = "CYGWIN" ]; then
    echo "Sorry, the lcalc build is currently broken"
    echo 1
fi

cd src

set +e 

success() {
    if [ $? -ne 0 ]; then
        echo "Error building lcalc '$1'"
        exit 1
    fi
}

set -e 

export DEFINES=""
cp ../../patches/Makefile.sage Makefile
make lcalc
success 'plain'

echo "Now copying over the lcalc binary"
cp lcalc "$SAGE_LOCAL/bin"
success 'install'