build.sh

#!/bin/sh -e
# Copyright (c) 2019 Sebastian Cato
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# build.sh - build script invoking make with tuned compilation flags
#

CFLAGS_release="-Os -pipe -fvisibility=hidden \
-ffunction-sections -fdata-sections -fomit-frame-pointer \
-fstack-protector-strong -march=native -fPIE -Wno-unused-command-line-argument"
# -DNDEBUG
LDFLAGS_release="-Wl,--gc-sections -pie"
# -Wl,--build-id=none

CFLAGS_dev="-O0 -g -pipe -fsanitize=address -fstack-protector-strong"
LDFLAGS_dev=""

die() {
  printf '%s\n' "$1" >&2
  exit 1
}

[ -z "$NCPUS" ] && NCPUS=2
[ "$1" != release -a "$1" != dev ] && die "usage: $0 <release|dev>"
BUILDTYPE=$1
LASTBUILD=$(cat .lastbuild 2>/dev/null || exit 0)

export CC=$(command -v clang40 || command -v clang || command -v gcc)

# TODO: substitution instead of conditional, as with makefiles?
if [ "$BUILDTYPE" = release ]; then
  export CFLAGS=$CFLAGS_release
  export LDFLAGS=$LDFLAGS_release
elif [ "$BUILDTYPE" = dev ]; then
  export CFLAGS=$CFLAGS_dev
  export LDFLAGS=$LDFLAGS_dev
else
  die "invalid build type"
fi

if [ "$LASTBUILD" != "$BUILDTYPE" ]; then
  echo "$BUILDTYPE" > .lastbuild
  make -j${NCPUS} distclean
fi

make -j${NCPUS} all
make -j${NCPUS} check