#!/bin/sh

asan=no
check_all=no
check_heap=no
check_kitten=no
check_queue=no
check=unknown
check_vectors=no
check_walk=no
compact=no
coverage=no
debug=no
default=no
embedded=unknown
extreme=no
kitten=unknown
logging=unknown
lto=no
m32=no
metrics=unknown
optimize=unknown
options=yes
pedantic=unknown
pic=no
profile=no
proofs=yes
quiet=no
safe=no
sat=no
shared=no
static=no
statistics=unknown
symbols=unknown
testdefault=unknown
ultimate=no
unsat=no

passtocompiler=""
passtolinker=""

goals="libkissat.a kissat recats"

usage () {
cat <<EOF
usage: configure [ <option> ... ]

where <option> is one of the following

EOF
if [ "$1" = complete ]
then
cat <<EOF
  -h      print only a list of common command line options
  --help  print this complete list of all command line options
EOF
else
cat <<EOF
  -h      print this list of common command line options
  --help  print a complete list of all command line options
EOF
fi
cat <<EOF

  -c      include assertion checking code (default for '-g')
  -g      compile for testing and debugging (implies '-c', '-s', '-l')
  -l      include logging code (default for '-g', needs run-time enabling too)
  -p      pedantic compilation ('-Werror -std=c99 --pedantic')
  -s      add symbols (default for '-g')

EOF
if [ ! "$1" = complete ]
then
cat << EOF
For a complete list of command line options try '--help'.
EOF
exit 0
fi
cat << EOF
Options used to instrument the code for coverage and performance profiling.

  --coverage        include line coverage code (to be used with 'gcov')
  --profile         include profiling code (to be used with 'gprof')

For coverage testing it might be useful to enforce different compiler
optimization levels, i.e., lower than the default '-O3' (without '-g').
  
  -O[0|1|2|3]       set the optimization level of the compiler explicitly

Writing through 'popen' can be considered harmful in certain library usage.

  --safe            disable the use of writing through 'popen'
                    (and thus disables writing zipped files too)

We have compile time options which save memory and speed up the solver by
limiting the size of formulas that can be handled, fix the default
configuration, disable messages, profiling and certain statistics.

  --compact         limit watcher stacks and clause arena size
  --no-options      fix all solver options to their default value
  --quiet           disable messages, built-in profiling and metrics
                   
  --competition     same as '--no-options --quiet' (competition configuration)
  --extreme         same as '--compact --no-options --quiet'
                   
  --no-proofs       do not include code for proof generation
  --ultimate        all configurations above ('--extreme --no-proofs')

For '--no-options' (and '--extreme', '--ultimate', and '--competition' too)
we allow the following options which enforce a different option at compile
time (corresponding to the same run-time settings without '--no-options'):

  --default         do not enforce specialized option configurations
  --sat             force options to focus on satisfiable instance
  --unsat           force options to focus on unsatisfiable instance

Redundant metrics and statistics gathering code can be enabled and disabled
separately.  Only essential counters are updated and printed without these.
Metrics are considered to be statistics, thus  '--metrics' also implies
'--statistics' and vice versa '--no-statistics' implies '--no-metrics.
   
   --metrics        include metrics code (default with '-g', '-l')
   --no-metrics     no metrics code (default with '--quiet' etc.)
                   
   --statistics     include statistics code (default without '--extreme')
   --no-statistics  no statistics code (default with '--extreme')

For (delta) debugging and testing the parser can read options embedded
in DIMACS files.  This feature is enabled for '-c', '-g', and '-l' but
disabled for optimized compilation (without '-c', '-g', nor '-l'),
except that '--embedded' is also assumed with '--coverage' unless options
are disabled (with '--no-options', '--extreme' or '--no-options').

   --embedded | -e  allow parsing option value pairs in DIMACS file 
   --no-embedded    disable parsing option value pairs in DIMACS file

The default goal of the generated 'makefile' only builds the library
'libkissat.a' and the stand alone SAT solver 'kissat'.  The test program
'tissat' is only compiled on demand (with 'make test'), unless '-g',
'--coverage' or '--embedded' is specified.  To force compilation of
'tissat' by default use the following:

   --test           compile test program by default (default with '-g')
   --no-test        do not compile test program (default without '-g')

The sub-solver 'kitten' used for extracting definitions has a stand-alone
mode and for testing purposes can be compiled into a 'kitten' binary.

   --kitten         generate 'kitten' binary too (default with '-g')
   --no-kitten      do not generate 'kitten' binary (default without '-g')

Enable (very) expensive low-level checkers for data structures:

   --check-all      check consistency of all data structures
   --check-heap     check consistency of binary heaps
   --check-kitten   check consistencies in 'Kitten' sub-solver
   --check-queue    check consistency of the variable-move-to-front queue
   --check-vectors  check consistency of watch vectors
   --check-walk     check consistency of local search

Enabling any of these enforces assertion and online proof checking ('-c').
We also allow an explicit choice of the C compiler.

  CC=<compiler>     default is 'gcc' (and we regularly test with 'CC=clang')

The following options are for convenience and in essence just passed through
to the makefile and thus the compiler to avoid editing the makefile.  However,
for '-m32' the configure script checks that it can actually really do 32-bit
builds. Furthermore, in case of '-fsanitize=address' the macro '-DASAN' is
defined, such that some tests incompatible with ASAN can be omitted.
       
  -m32              add '-m32' option to compile for 32-bit
  -static           add '-static' linking flag
  -shared           add '-fpic' compilation flag and produce shared library

  -f...             add '-f...' options, such as
                    -fsanitize=address', '-fpic' or '-flto'

The default configuration builds optimized code with 'gcc' without symbols,
an no checking, metrics, embedded options parsing nor logging code included.
EOF
  exit 0
}

msg () {
  echo "configure: $*"
}

if [ -t 1 ]
then
  BOLD="\033[1m"
  NORMAL="\033[0m"
  RED="\033[1;31m"
else
  BOLD=""
  NORMAL=""
  RED=""
fi

die () {
  echo "${BOLD}configure: ${RED}error:${NORMAL} $*" 1>&2
  exit 1
}

[ $# = 0 ] && \
msg "default configuration (see '-h')"

while [ $# -gt 0 ]
do
  case "$1" in
    -h) usage;;
    --help) usage complete;;
    -p) pedantic=yes;;

    -c) check=yes;;
    -g) debug=yes;;
    -l) logging=yes;;
    -s) symbols=yes;;

    --coverage) coverage=yes;;
    --profile) profile=yes;;

    -O0) optimize=0;;
    -O1) optimize=1;;
    -O2) optimize=2;;
    -O3) optimize=3;;

    --safe) safe=yes;;

    --compact) compact=yes;;
    --no-options) options=no;;
    --quiet) quiet=yes;;
    --extreme) extreme=yes;;
    --competition) options=no; quiet=yes;;

    --default) default=yes;;
    --sat) sat=yes;;
    --unsat) unsat=yes;;

    --no-proofs) proofs=no;;
    --ultimate) ultimate=yes;;

    --metrics)
      [ $metrics = no ] && \
        die "can not combine '--metrics' and '--no-metrics'"
      metrics=yes
      ;;
    --no-metrics)
      [ $metrics = yes ] && \
        die "can not combine '--metrics' and '--no-metrics'"
      metrics=no
      ;;

    --stats | --statistics)
      [ $statistics = no ] && \
        die "can not combine '--statistics' and '--no-statistics'"
      statistics=yes
      ;;
    --no-stats | --no-statistics)
      [ $statistics = yes ] && \
        die "can not combine '--statistics' and '--no-statistics'"
      statistics=no
      ;;

    -e|--embedded) embedded=yes;;
    --no-embedded) embedded=no;;

    -m32) m32=yes;;
    -static|--static) static=yes;;
    -shared|--shared) shared=yes;;
    -fpic|-fPIC) passtocompiler="$passtocompiler $1"; pic=yes;;
    -flto)
      passtolinker="$passtolinker $1"
      passtocompiler="$passtocompiler $1"
      lto=yes
      ;;
    -f*)
      [ x"`echo $1|grep fsanitize=.*address`" = x ] || asan=yes
      passtolinker="$passtolinker $1"
      passtocompiler="$passtocompiler $1"
      ;;

    --test|-tests|--tests) testdefault=yes;;
    --no-test|--no-tests) testdefault=no;;

    --kitten) kitten=yes;;
    --no-kitten) kitten=no;;

    --check-all) check_all=yes;;
    --check-heap) check_heap=yes;;
    --check-kitten) check_kitten=yes;;
    --check-queue) check_queue=yes;;
    --check-vectors) check_vectors=yes;;
    --check-walk) check_walk=yes;;

    CC=*) CC="`echo \"$1\"|sed -e s,^CC=,,`";;

    *) die "invalid option '$1' (try '-h')";;
  esac
  shift
done

dir="`pwd|sed -e 's,.*/,,'`"

if [ -d src -a -f VERSION ]
then
   BUILD=build
elif [ -f kissat.h -o x"$dir" = xtest -o x"$dir" = xscripts ]
then
   BUILD=../build/
elif [ -d ../src -a -f ../VERSION ]
then
   BUILD=../"`pwd|sed -e 's,.*/,,'`"
else
   die "could not find 'src' nor 'VERSION' in current nor parent directory"
fi

if [ -d "$BUILD" ]
then
  msg "reusing existing build directory '$BUILD'"
else
  mkdir "$BUILD" || exit 1
  msg "new build directory '$BUILD'"
fi

cd "$BUILD" || exit 1

BUILD="`pwd`"
ROOT="`pwd|sed -e 's,/[^/]*$,,'`"

for dir in src test
do
  rm -f $dir
  ln -s ../$dir $dir 2>/dev/null || \
    die "could not link to '../$dir'"
done

cat <<EOF >../makefile
all:
	\$(MAKE) -C "$BUILD"
kissat:
	\$(MAKE) -C "$BUILD" kissat
tissat:
	\$(MAKE) -C "$BUILD" tissat
clean:
	rm -f "$ROOT"/makefile
	rm -f "$ROOT"/src/makefile
	-\$(MAKE) -C "$BUILD" clean
	rm -rf "$BUILD"
coverage:
	\$(MAKE) -C "$BUILD" coverage
format:
	\$(MAKE) -C "$BUILD" format
test:
	\$(MAKE) -C "$BUILD" test
.PHONY: all clean coverage format kissat test tissat
EOF

[ $statistics = no -a $metrics = yes ] && \
  die "can not combine '--no-statistics' and '--metrics'"
[ $statistics = yes -a $metrics = yes ] && \
  die "redundant combination '--statistics' and '--metrics'"
[ $statistics = no -a $metrics = no ] && \
  die "redundant combination '--no-statistics' and '--no-metrics'"
[ $statistics = yes -a $metrics = yes ] && \
  die "redundant combination '--statistics' and '--metrics'"

[ $shared = yes -a $static = yes ] && \
  die "can not combine '--static' and '--shared'"

if [ $debug = yes ]
then
  [ $check = yes ] && die "can not combine '-g' and '-c'"
  [ $logging = yes ] && die "can not combine '-g' and '-l'"
  [ $symbols = yes ] && die "can not combine '-g' and '-s'"
  [ $metrics = yes ] && "can not combine '-g' and '--metrics'"
  [ $statistics = yes ] && "can not combine '-g' and '--statistics'"
fi

if [ $quiet = yes ]
then
  [ $logging = yes ] && die "can not combine '--quiet' and '-l'"
  [ $metrics = no ] && "can not combine '--quiet' and '--no-metrics'"
  [ $statistics = no ] && "can not combine '--quiet' and '--no-statistics'"
fi

if [ $extreme = yes ]
then
  [ $compact = yes ] && die "can not combine '--extreme' and '--compact'"
  [ $embedded = yes ] && die "can not combine '--extreme' and '--embedded'"
  [ $logging = yes ] && die "can not combine '--extreme' and '-l'"
  [ $options = no ] && die "can not combine '--extreme' and '--no-options'"
  [ $quiet = yes ] && die "can not combine '--extreme' and '--quiet'"
  [ $ultimate = yes ] && die "can not combine '--extreme' and '--ultimate'"
  [ $metrics = no ] && "can not combine '--extreme' and '--no-metrics'"
  [ $statistics = no ] && "can not combine '--extreme' and '--no-statistics'"
  compact=yes
  options=no
  quiet=yes
fi

if [ $ultimate = yes ]
then
  [ $compact = yes ] && die "can not combine '--ultimate' and '--compact'"
  [ $embedded = yes ] && die "can not combine '--ultimate' and '--embedded'"
  [ $logging = yes ] && die "can not combine '--ultimate' and '-l'"
  [ $options = no ] && die "can not combine '--ultimate' and '--no-options'"
  [ $proofs = no ] && die "can not combine '--ultimate' and '--no-proofs'"
  [ $quiet = yes ] && die "can not combine '--ultimate' and '--quiet'"
  [ $metrics = no ] && "can not combine '--ultimate' and '--no-metrics'"
  [ $statistics = no ] && "can not combine '--ultimate' and '--no-statistics'"
  compact=yes
  options=no
  proofs=no
  quiet=yes
fi

[ $default = yes -a $sat = yes ] && \
die "can not combine '--default' and '--sat'"

[ $default = yes -a $unsat = yes ] && \
die "can not combine '--default' and '--unsat'"

[ $sat = yes -a $unsat = yes ] && die "can not combine '--sat' and '--unsat'"

[ $default = yes -a $options = yes ] && \
die "can not use '--default' without '--no-options'"

[ $sat = yes -a $options = yes ] && \
die "can not use '--sat' without '--no-options'"

[ $unsat = yes -a $options = yes ] && \
die "can not use '--unsat' without '--no-options'"

if [ $options = no ]
then
  [ $embedded = yes ] && die "can not combine '--no-options' and '--embedded'"
fi

if [ $metrics = unknown ]
then
  if [ $statistics = no ]
  then
    metrics=no
  elif [ $debug = yes -o $logging = yes ]
  then
    metrics=yes
  else
    metrics=no
  fi
elif [ $metrics = yes ]
then
  [ $logging = yes ] && die "can not combine '--metrics' and '-l'" 
else
  [ $debug = no -a $logging = no ] && \
    die "can not use '--no-metrics' without '-g' nor '-l'" 
fi

if [ $statistics = unknown ]
then
  if [ $metrics = yes -o $debug = yes -o $logging = yes ]
  then
    statistics=yes
  else
    statistics=no
  fi
elif [ $statistics = yes -a $logging = yes ]
then
  die "can not combine '--metrics' and '-l'" 
fi

if [ $check_all = yes ]
then
  check_heap=yes
  check_kitten=yes
  check_queue=yes
  check_vectors=yes
  check_walk=yes
fi
[ $check_heap = yes ] && check=yes
[ $check_kitten = yes ] && check=yes
[ $check_queue = yes ] && check=yes
[ $check_vectors = yes ] && check=yes
[ $check_walk = yes ] && check=yes

if [ $embedded = unknown ]
then
  if [ $options = no ]
  then
    embedded=no
  elif [ $check = yes -o $debug = yes -o $logging = yes -o $coverage = yes ]
  then
    embedded=yes
  else
    embedded=no
  fi
elif [ $embedded = yes ]
then
  [ $check = yes ] && die "can not combine '--embedded' and '-c'" 
  [ $debug = yes ] && die "can not combine '--embedded' and '-g'" 
  [ $logging = yes ] && die "can not combine '--embedded' and '-l'" 
elif [ $check = no -a $debug = no -a $logging = no ]
then
  die "can not use '--no-embedded' without '-c', '-g', nor '-l'"
fi

[ $quiet = yes ] && logging=no
[ $symbols = unknown ] && symbols=$debug
[ $logging = unknown ] && logging=$debug
[ $check = unknown ] && check=$debug

[ "$CC" = "" ] && CC=gcc

if [ $m32 = yes ]
then
  passtolinker="$passtolinker -m32"
  passtocompiler="$passtocompiler -m32"
cat <<EOF > m32.c
#include <stdio.h>
int main (void) {
  printf ("%zu\n", sizeof (void*));
  return 0;
}
EOF
  if $CC -m32 -o m32 m32.c 1>/dev/null 2>/dev/null
  then
    res="`./m32 2>/dev/null`"
    if [ "$res" = 4 ]
    then
      msg "compilation with '-m32' leads to pointer size of '$res' bytes"
    else
      die "'$BUILD/m32' determines pointer size of '$res' bytes"
    fi
  else
    die "32-bit compilation '$CC -m32 $BUILD/m32.c' failed (install 'g++-multilib' before using '-m32' option)"
  fi
fi

CFLAGS=""

case "$CC" in
  gcc*|*-gcc|clang*)
    CFLAGS="$CFLAGS -W -Wall"
    [ $pedantic = yes ] && \
      CFLAGS="$CFLAGS -Werror -std=c99 --pedantic"
    if [ $optimize = unknown ]
    then
      [ $debug = no ] && CFLAGS="$CFLAGS -O3"
    else
      CFLAGS="$CFLAGS -O$optimize"
    fi
    [ $symbols = yes ] && CFLAGS="$CFLAGS -g"
    if [ $profile = yes ]
    then
      CFLAGS="$CFLAGS -pg"
      passtolinker="$passtolinker -pg"
    fi
    if [ $coverage = yes ]
    then
      passtocompiler="$passtocompiler -ftest-coverage -fprofile-arcs"
      passtolinker="$passtolinker -ftest-coverage -fprofile-arcs"
    fi
    ;;
  *)
    CFLAGS="$CFLAGS -W"
    if [ $optimize = unknown ]
    then
      [ $debug = no ] && CFLAGS="$CFLAGS -O"
    else
      CFLAGS="$CFLAGS -O$optimize"
    fi
    [ $symbols = yes ] && CFLAGS="$CFLAGS -g"
    if [ $profile = yes ]
    then
      CFLAGS="$CFLAGS -p"
      passtolinker="$passtolinker -p"
    fi
    ;;
esac

case x"$CC" in
  x*gcc*)
    gccversion="`$CC --version|head -1|awk '{print \$NF}'`"
    case x"$gccversion" in
      x4*)
        msg "GCC version $gccversion requires '-std=c99'"
        CFLAGS="$CFLAGS -std=c99"
        ;;
      *)
        msg "assuming GCC version $gccversion uses C99 by default"
        ;;
    esac
    ;;
esac


[ $shared = yes -a $pic = no ] && passtocompiler="$passtocompiler -fpic"

[ $asan = yes ] && CFLAGS="$CFLAGS -DASAN"
[ $lto = yes ] && CFLAGS="$CFLAGS -DLTO"
[ $check_heap = yes ] && CFLAGS="$CFLAGS -DCHECK_HEAP"
[ $check_kitten = yes ] && CFLAGS="$CFLAGS -DCHECK_KITTEN"
[ $check_queue = yes ] && CFLAGS="$CFLAGS -DCHECK_QUEUE"
[ $check_vectors = yes ] && CFLAGS="$CFLAGS -DCHECK_VECTORS"
[ $check_walk = yes ] && CFLAGS="$CFLAGS -DCHECK_WALK"

[ $compact = yes ] && CFLAGS="$CFLAGS -DCOMPACT"

if [ $coverage = yes ]
then
  case "$CC" in
    gcc*) CFLAGS="$CFLAGS -DCOVERAGE"
  esac
fi

[ $embedded = yes ] && CFLAGS="$CFLAGS -DEMBEDDED"
[ $quiet = no -a $logging = yes ] && CFLAGS="$CFLAGS -DLOGGING"
[ $check = no ] && CFLAGS="$CFLAGS -DNDEBUG"
[ $metrics = yes ] && CFLAGS="$CFLAGS -DMETRICS"
[ $options = no ] && CFLAGS="$CFLAGS -DNOPTIONS"
[ $proofs = no ] && CFLAGS="$CFLAGS -DNPROOFS"
[ $quiet = yes ] && CFLAGS="$CFLAGS -DQUIET"
[ $safe = yes ] && CFLAGS="$CFLAGS -DSAFE"
[ $sat = yes ] && CFLAGS="$CFLAGS -DSAT"
[ $statistics = yes -a $metrics = no ] && CFLAGS="$CFLAGS -DSTATISTICS"
[ $unsat = yes ] && CFLAGS="$CFLAGS -DUNSAT"

CFLAGS="${CFLAGS}$passtocompiler"

msg "compiler '$CC $CFLAGS'"

[ $static = yes ] && passtolinker="$passtolinker -static"

if [ "$passtolinker" = "" ]
then
  LD="${CC}"
  msg "linker '$LD' (no additional options)"
else
  LD="${CC}$passtolinker"
  msg "linker '$LD' (additional options)"
fi

case "$CC" in
  *-linux-gnu-gcc)
    architecture="`echo $CC|sed -e 's,\(.*\)-linux-gnu-gcc,\1,'`"
    AR="${architecture}-linux-gnu-ar"
    msg "cross compilation for '$architecture' (using '$AR')"
    ;;
  *)
    AR="ar"
    msg "using default 'ar' (no cross compilation)"
    ;;
esac

if [ $testdefault = unknown ]
then
  if [ $coverage = yes -o $embedded = yes ]
  then
    testdefault=yes
  else
    testdefault=$debug
  fi
fi

testgoal="tissat"
if [ $testdefault = yes ]
then
  msg "adding '$testgoal' goal to default makefile goal too"
  goals="$goals $testgoal"
else
  msg "no '$testgoal' binary generated (without '--test')"
fi

sharedlibrary="libkissat.so"
if [ $shared = yes ]
then
  msg "adding '$sharedlibrary' shared library to default makefile goal too"
  goals="$goals $sharedlibrary"
else
  if [ -f $sharedlibrary ]
  then
    msg "removing stale dynamic library '$sharedlibrary' (without '-shared')"
    rm -f $sharedlibrary || exit 1
  fi
  msg "no '$sharedlibrary' shared library generated (without '-shared')"
fi

[ $kitten = unknown ] && kitten=$debug

kittengoal="kitten"
if [ $kitten = yes ]
then
  msg "adding '$kittengoal' binary to default makefile goal too"
  goals="$goals $kittengoal"
  KITTEN=" -DKITTEN"
else
  if [ -f $kittengoal ]
  then
    msg "removing stale '$kittengoal' binary (without '--kitten')"
    rm -f $kittengoal || exit 1
  fi
  msg "no '$kittengoal' binary generated (without '--kitten')"
  KITTEN=""
fi

rm -f makefile
sed \
  -e "s#@CC@#$CC$CFLAGS#" \
  -e "s#@KITTEN@#$KITTEN#" \
  -e "s#@LD@#$LD#" \
  -e "s#@AR@#$AR#" \
  -e "s#@GOALS@#$goals#" \
  ../makefile.in > makefile

if [ -f ../src/makefile ]
then
  msg "removing src/makefile"
  rm -f ../src/makefile
fi

msg "linking src/makefile"
ln -s $ROOT/makefile ../src
