configure

#! /bin/bash
# Run this file to recreate the current configuration.

CFLAGSS=("-O" "-O3" "-g")
CCS=("gcc" "cc")
OPTS=("-fPIC" "-I." )


# specify a temporary directory
TEMP=/tmp


# see
# https://askubuntu.com/questions/674333/how-to-pass-an-array-as-function-argument
# for help on syntax here -- sh is *horrible* syntax
# run a test over a loop
# and return the first that works
# eg
# LS=$(test_cmd which "lss ls")
function test_cmd () {
  declare c="$1"; shift 1
  rest=("$@")
  for arg in "${rest[@]}";
  do
    if eval $c $arg > /dev/null 2>&1
    then
      echo $arg
      echo "Type1" $c $arg 1>&2 
      return $?
    elif eval $arg $c > /dev/null 2>&1
    then
      echo $arg
      echo "Type1" $arg $c  1>&2 
      return $?
    else
      echo "Not" $c  $arg 1>&2 
      echo "Nor"  $arg $c 1>&2 
      eval $arg $c
    fi

  done
  return $?
}





ARCH=$(uname -m)
HERE=$(pwd)
BPMS=${BPMS-$HERE}
ASYSTEM=$(uname -s)

# set OS to arch unless MSYSTEM already set
MSYSTEM=${MSYSTEM-$ARCH}
OS=$MSYSTEM
WINDOWS=MINGW64
echo ">>>> $OS  : $MSYSTEM : $ASYSTEM : $HERE : $BPMS"

if [ "$MSYSTEM" = "MINGW64" ] || [ "$ImageOS" = "win19" ]
then
  echo "..." "$MSYSTEM"=="MINGW64"  "$OS"=="win19" ": $OS : $MSYSTEM" 
  LIBEXT='dll'
  LIBC='-lmsvcrt -lm'
else
  echo ".. $MSYSTEM : $OS"
  LIBEXT='so'
  LIBC='-lc -lm'
fi

##################
# test codes
##################



##################
# makefile
##################

# fixers
q='\/'
BPMS_=$(echo $BPMS | sed 's/\//Qq/g')
# initialise makefile
sed < $BPMS/src/Makefile.in 's/@BPMS@/'$BPMS_'/' | sed 's/Qq/'$q'/g' | sed 's/@ASYSTEM@/'$ASYSTEM'/' |sed 's/@LIBEXT@/'$LIBEXT'/' |sed 's/@OS@/'$OS'/' | sed 's/@ARCH@/'$ARCH'/' > $BPMS/src/makefile

mkdir -p bin/${OS}
PATH=".:c/MinGW/bin:bin:bin/${OS}:${PATH}"

# create test C code file
echo '#include <stdio.h>' > $TEMP/test_$$.c
echo 'int no_main(int argc,char ** argv){printf("hello world\\n");return(1);}' >> $TEMP/test_$$.c
echo '' >> $TEMP/test_$$.c

##################
# $CC
##################
CC=$(test_cmd "which" "${CCS[@]}")
sed < ${BPMS}/src/makefile 's/@CC@/'"$CC"'/' > $TEMP/tmp.$$; mv $TEMP/tmp.$$ ${BPMS}/src/makefile

##################
# $CFLAGS
##################
CFLAGS=$(test_cmd "${CC} $TEMP/test_$$.c -o $TEMP/test_$$.o -c" "${CFLAGSS[@]}")
sed < ${BPMS}/src/makefile 's/@CFLAGS@/'"$CFLAGS"'/' > $TEMP/tmp.$$; mv $TEMP/tmp.$$ ${BPMS}/src/makefile

################## 
# $OPT
##################
OPT=$(test_cmd "${CC} ${CFLAGS} $TEMP/test_$$.c -o $TEMP/test_$$.o -c" "${OPTS[@]}")
sed < ${BPMS}/src/makefile 's/@OPT@/'"$OPT"'/' > $TEMP/tmp.$$; mv $TEMP/tmp.$$ ${BPMS}/src/makefile

# tidy up
rm -f $TEMP/test_$$.c
exit 0