configure

#!/bin/sh

enable_doc=auto

help() {
  cat <<EOF
usage: ./configure [options]
options:
  --help             show this help message
  --prefix=DIR       installation prefix
  --bindir=DIR       binary dir (PREFIX/bin)
  --datarootdir=DIR  data root directory (PREFIX/share)
  --mandir=DIR       manual page root directory (DATAROOTDIR/man)
  --man1dir=DIR      section 1 manual page directory (MANDIR/man1)
  --enable-doc       enable documentation (default: if rst2man is found)
  --disable-doc      disable documentation
EOF
}

die() {
  echo "$@" >&2
  exit 1
}

logmsg() {
  echo "$@"
  echo "$@" >&4
}

logrun() {
  echo "$@" >&4
  "$@" >&4 2>&4
  logrun_res="$?"
  echo "---" >&4
  echo >&4
  return "$logrun_res"
}

for opt; do
  case "$opt" in
    -h|--h|--help) help; exit 0 ;;
    --prefix=*) PREFIX="${opt#--prefix=}" ;;
    --bindir=*) BINDIR="${opt#--bindir=}" ;;
    --datarootdir=*) DATAROOTDIR="${opt#--datarootdir=}" ;;
    --mandir=*) MANDIR="${opt#--mandir=}" ;;
    --man1dir=*) MAN1DIR="${opt#--man1dir=}" ;;
    --enable-doc=*) enable_doc="${doc#--enable-doc=}" ;;
    --enable-doc)   enable_doc=yes ;;
    --disable-doc)  enable_doc=no ;;
    *) die "Unknown option: $opt" ;;
  esac
done

rm -f config.log
exec 4>config.log

absdirname()
(cd `dirname $1`; pwd)

SOURCEDIR=`absdirname $0`

NETEVENT_VERSION="$(sed -ne '/^# Release/{s/^# Release\s*//;p;q}' "$SOURCEDIR/ChangeLog.md")"

PREFIX="${PREFIX:-/usr/local}"
BINDIR="${BINDIR:-${PREFIX}/bin}"
DATAROOTDIR="${DATAROOTDIR:-${PREFIX}/share}"
MANDIR="${MANDIR:-${DATAROOTDIR}/man}"
MAN1DIR="${MAN1DIR:-${MANDIR}/man1}"

isautoyes() {
  case "$1" in
    auto|[Yy][Ee][Ss]|1|[Oo][Nn]|[Tt][Rr][Uu][Ee])
      return 0 ;;
    *)
      return 1 ;;
  esac
}

if test -z "$CXX"; then
  if which clang++ >/dev/null 2>&1; then
    CXX=clang++
  elif which g++ >/dev/null 2>&1; then
    CXX=g++
  else
    echo
    echo "failed to find a compiler, please set \$CXX" >&2
    exit 1
  fi
fi

echo -n 'Checking for rst2man...'
if isautoyes "$enable_doc"; then
  ENABLE_DOC=y
  if test -z "$RST2MAN"; then
    RST2MAN="$(which rst2man 2>/dev/null)"
    if [ $? -ne 0 ]; then
      ENABLE_DOC=
      RST2MAN=
      if [ "x$enable_doc" != "xauto" ]; then
        echo "failed to find rst2man" >&2
        exit 1
      fi
    fi
  fi
else
  ENABLE_DOC=
  RST2MAN=
fi
if [ "x$ENABLE_DOC" = x ]; then
  echo 'no, disabling documentation building'
else
  echo "$RST2MAN"
fi

trycc() {
  echo "$1" >.cfgtest.cpp
  logrun $CXX $CPPFLAGS $CXXFLAGS -c -o .cfgtest.o .cfgtest.cpp
  try_compile_result="$?"
  rm -f .cfgtest.o .cfgtest.cpp
  return $try_compile_result
}

UI_DEV_CKPROG="#include <sys/ioctl.h>
#include <linux/uinput.h>
int main() {
  struct uinput_setup setup;
  ioctl(0, UI_DEV_SETUP);
  ioctl(0, UI_ABS_SETUP);
  return 0;
}
"

echo -n 'Checking for UI_DEV_SETUP (kernel >= 4.4)...'
if trycc "$UI_DEV_CKPROG"; then
  HAS_UI_DEV_SETUP='#define HAS_UI_DEV_SETUP'
  echo "ok"
else
  HAS_UI_DEV_SETUP='/* #undef HAS_UI_DEV_SETUP */'
  echo "no (disabling)"
fi

rm -f config.h
echo '#ifndef NETEVENT_2_CONFIG_H' >>config.h
echo '#define NETEVENT_2_CONFIG_H' >>config.h
echo >>config.h
echo "#define NETEVENT_VERSION \"$NETEVENT_VERSION\"" >>config.h
echo "$HAS_UI_DEV_SETUP" >>config.h
echo >>config.h
echo '#endif' >>config.h

rm -f config.mak
cat >config.mak <<EOF
PREFIX = ${PREFIX}
BINDIR = ${BINDIR}
DATAROOTDIR = ${DATAROOTDIR}
MANDIR = ${MANDIR}
MAN1DIR = ${MAN1DIR}
ENABLE_DOC = ${ENABLE_DOC}
RST2MAN = ${RST2MAN}
CXX = ${CXX}
SOURCEDIR = ${SOURCEDIR}
EOF

if [ "${SOURCEDIR}" != "${PWD}" ]; then
	# Only use VPATH for out-of-tree builds; it can be problematic for some
	# variants of `make` and users of these variants will be limited to in-tree
	# builds only.
	echo >>config.mak "VPATH = ${SOURCEDIR}"
	cp "${SOURCEDIR}/Makefile" ./
fi