#!/usr/bin/env bash
#
# Build the murmur_nif shared library.
#
# Honors:
#   ERTS_INCLUDE_DIR     : path to erl_nif.h (default: derived from `erl`).
#   CC                   : compiler (default: cc).
#   CFLAGS               : extra compile flags appended after defaults.
#   MURMUR_NIF_NO_NATIVE : if set, skip -march=native (portable builds).

set -eu

cd "$(dirname "$0")/.."

if [ -z "${ERTS_INCLUDE_DIR:-}" ]; then
    ERTS_INCLUDE_DIR=$(erl -noshell \
        -eval 'io:format("~s/erts-~s/include/", [code:root_dir(), erlang:system_info(version)]).' \
        -s init stop)
fi

CC=${CC:-cc}
TARGET=priv/murmur_nif.so
SRCS="c_src/murmur_nif.c c_src/murmur3/murmur3.c"

BASE_CFLAGS="-fPIC -O3 -std=gnu11 -Wall -Wextra -Wno-unused-parameter -Wno-implicit-fallthrough"
if [ -z "${MURMUR_NIF_NO_NATIVE:-}" ]; then
    BASE_CFLAGS="$BASE_CFLAGS -march=native -mtune=native"
fi

LDFLAGS="-shared"
if [ "$(uname -s)" = "Darwin" ]; then
    LDFLAGS="$LDFLAGS -undefined dynamic_lookup"
fi

mkdir -p priv
exec $CC \
    $BASE_CFLAGS \
    -I"$ERTS_INCLUDE_DIR" \
    -Ic_src/murmur3 \
    ${CFLAGS:-} \
    $LDFLAGS \
    -o "$TARGET" \
    $SRCS