configure

#!/bin/sh -e
#
# Copyright (c) 2022 Mark Heily <mark@heily.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

err() {
  echo "ERROR: $*"
  exit 1
}

cd "$(dirname "$0")"

prefix="/usr/local"
build_type="debug"
objdir=""
mandir=""
coverage="no"
use_msan="no"
use_lto="yes"
target_cxxflags="-std=gnu++17 -D_GNU_SOURCE"

for arg in "$@"
do
    key=$(echo "$arg" | sed 's/^--//; s/=.*//')
    val=$(echo "$arg" | grep '=' | sed "s/^--${key}=//")
    case $key in
      build-type)
        build_type=$val
         ;;
      objdir)
         objdir="$val"
        ;;
      mandir)
        mandir="$val" ;;
      prefix)
         prefix=$val
        ;;
      enable-coverage)
        coverage="yes"
        ;;
      enable-msan)
        use_msan="yes"
        ;;
      disable-lto)
        use_lto="no"
        ;;
      *)
        echo "invalid usage"
        exit 1
    esac
done

project=relaunchd
project_version=$(grep 'project(relaunchd VERSION' CMakeLists.txt| awk '{print $3}' | sed 's/)//')
printf 'configuring %s version %s\n' "$project" "$project_version"

printf 'setting build type to %s\n' $build_type
case $build_type in
debug)
  build_type_flags="-g3 -O0 -Wall -Wextra -fno-omit-frame-pointer"
  # Enable GNU libstdc++ debug mode, which adds some sanity checking to STL containers"
  build_type_flags="${build_type_flags} -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC"
  ;;
release)
  build_type_flags="-Os -Wall -Wextra -Werror"
  ;;
*)
  exit 2
esac

if [ -z "$objdir" ] ; then
  objdir=$(pwd)
fi
if [ ! -e "$objdir" ] ; then
  mkdir "$objdir"
else
  test -O "$objdir"
fi
objdir=$(realpath "$objdir")
printf 'build artifacts will be created in %s\n' "$objdir"

printf 'executables will be installed using the prefix of %s\n' "$prefix"

if [ -z "$mandir" ] ; then
    mandir="${prefix}/share/man"
fi
printf 'man pages will be installed in %s\n' "$mandir"

printf 'checking if code coverage is enabled.. '
if [ "$coverage" = "yes" ] ; then
  echo 'yes'
  if [ "$objdir" = "$(pwd)" ] ; then
    echo "Error: coverage reports require an out-of-tree build"
    exit 1
  fi
else
  echo 'no'
fi

printf 'checking for nlohmann::json... '
if pkg-config --cflags nlohmann_json >/dev/null 2>&1 ; then
  echo "found"
  target_cxxflags="$target_cxxflags $(pkg-config --cflags nlohmann_json)"
else
  echo "not found"
  exit 1
fi

if [ "$objdir" = "$(pwd)" ] ; then
  makefilepath="Makefile"
  config_h_path="src/config.h"
else
  makefilepath="$objdir/Makefile"
  config_h_path="$objdir/src/config.h"
  test -e "$objdir/src" || ln -s "$(pwd)/src" "$objdir/src"
  test -e "$objdir/man" || ln -s "$(pwd)/man" "$objdir/man"
  test -e "$objdir/test" || ln -s "$(pwd)/test" "$objdir/test"
  mkdir -p "$objdir/tmp"
fi

echo "writing $makefilepath"
rm -f $makefilepath
(
echo "# DO NOT EDIT: generated by ./configure"
echo "PROJECT_VERSION=$project_version"
echo "OBJDIR=$objdir"
echo "MANDIR=$mandir"
echo "PREFIX=$(echo "$prefix" | sed 's,/$,,')"
echo "TARGET_CXXFLAGS = $build_type_flags -D_GNU_SOURCE $target_cxxflags"
if [ "$coverage" = "yes" ] ; then
    echo "# Enable code coverage"
    echo "TARGET_CXXFLAGS += -fprofile-arcs -ftest-coverage"
fi
if [ "$use_msan" = "yes" ] ; then
  echo "# Enable MSAN"
  echo "TARGET_CXXFLAGS += -fsanitize=memory -fsanitize-memory-track-origins=2"
fi
if [ "$use_lto" = "yes" ] ; then
  echo "# Enable LTO"
  echo "TARGET_CXXFLAGS += -flto"
fi
) >> "$makefilepath"
cat Makefile.in >> $makefilepath

for file in src/config.h man/launchd.8
do
  outfile="$objdir/$(basename "$file")"
  printf "writing %s\n" "$outfile"
  sed -e "
    s,\${PREFIX},$prefix,g;
    s,\${CMAKE_PROJECT_VERSION},$project_version,g;
    s,\${PKGSTATEDIR},/var/db/relaunchd,g;
    s,\${XML_MANIFEST_SUPPORT},0,g;
    s,\${SYSTEM_AGENT_LOAD_PATH},/etc/relaunchd/LaunchAgents,g;
    s,\${SYSTEM_DAEMON_LOAD_PATH},/etc/relaunchd/LaunchDaemons,g;
    s,\${USER_AGENT_LOAD_PATH},~/.config/relaunchd/LaunchAgents,g;
    s,\${VENDOR_AGENT_LOAD_PATH},/lib/relaunchd/LaunchAgents,g;
    s,\${VENDOR_DAEMON_LOAD_PATH},/lib/relaunchd/LaunchDaemons,g;
    " < "${file}.in" > "$outfile"
done