config

#!/bin/bash
SCRIPT_DIR=$(dirname "${BASH_SOURCE[0]}")
PROJECT_DIR=$(readlink -f ${SCRIPT_DIR})

set_base_flags() {
  CXXFLAGS="${CXXFLAGS} -Wall -Wconversion -Werror -Wextra -Wshadow -Wunused -pedantic -pedantic-errors -fno-rtti -fPIC -std=c++17 -Wno-gnu-string-literal-operator-template"
  LINKFLAGS="${LINKFLAGS}"
  DEFINES="${DEFINES}"
}

publish_unique_flags() {
  CXXFLAGS=$(echo ${CXXFLAGS} | tr ' ' '\n' | sort | uniq | tr '\n' ' ')
  LINKFLAGS=$(echo ${LINKFLAGS} | tr ' ' '\n' | sort | uniq | tr '\n' ' ')
  DEFINES=$(echo ${DEFINES} | tr ' ' '\n' | sort | uniq | tr '\n' ' ')
  export CXXFLAGS
  export LINKFLAGS
  export DEFINES
}

set_flags() {
  case "$1" in
    'debug')
      CXXFLAGS="${CXXFLAGS} -g -O0"
      DEFINES="${DEFINES} DEBUG"
    ;;
    'release')
      CXXFLAGS="${CXXFLAGS} -O3 -march=native"
      DEFINES="${DEFINES} NDEBUG"
      LINKFLAGS="${LINKFLAGS} -flto"
    ;;
    'sanitize')
      CXXFLAGS="${CXXFLAGS} -fsanitize=address -fsanitize=undefined"
      LINKFLAGS="${LINKFLAGS} -fsanitize=address -fsanitize=undefined"
      export ASAN_OPTIONS=symbolize=1:abort_on_error=1
      export UBSAN_OPTIONS=print_stacktrace=1:halt_on_error=1:suppressions=${PROJECT_DIR}/test/ub.supp
    ;;
    'coverage')
      CXXFLAGS="${CXXFLAGS} -fprofile-arcs -ftest-coverage"
      LINKFLAGS="${LINKFLAGS} -fprofile-arcs -ftest-coverage"
    ;;
    'libc++')
      CXXFLAGS="${CXXFLAGS} -stdlib=libc++"
      LINKFLAGS="${LINKFLAGS} -stdlib=libc++"
    ;;
    'g++')
      export CXX="g++"
    ;;
    'clang++')
      export CXX="clang++"
    ;;
    *)
      echo 'wrong switch ' ${1}
  esac
}

clear_flags() {
  unset CXXFLAGS
  unset LINKFLAGS
  unset DEFINES
}

if [ "$#" == "0" ]; then
  exit 1
fi

while (( "$#" )); do
  if [ "$1" == "clear" ]; then
    clear_flags
  else
    set_flags $1
  fi
  shift
done

set_base_flags
publish_unique_flags