Make: Support environment variables

Author: imkiva

make.sh

@@ -1,4 +1,45 @@
+#!/bin/bash
+
+set -e
+SELF_DIR="$(dirname $(readlink -f $0))"
+cd "$SELF_DIR"
+
+function set_flag() {
+    local append=false
+
+    if [[ "$1" == "--append" ]]; then
+        shift
+        append=true
+    fi
+
+    local var="$1"; shift
+    declare -n ref="$var" 
+    if [[ "$ref" == "" ]]; then
+        ref="$@"
+    elif [[ "$append" == true ]]; then
+        ref="$ref $@"
+    fi
+}
+
+DEFAULT_CXXFLAGS="-std=c++11 -I ../include -shared -fPIC -s -O3 -ldl"
+DEFAULT_LDFLAGS=""
+DEFAULT_CXX=g++
+
+set_flag CXX $DEFAULT_CXX
+set_flag --append CXXFLAGS $DEFAULT_CXXFLAGS
+set_flag --append LDFLAGS $DEFAULT_LDFLAGS
+
+while [[ "$1"x != ""x ]]; do
+    arg="$1"; shift
+    case "$arg" in
+        --cxxflags=* ) CXXFLAGS="${arg##--cxxflags=}" ;;
+        --ldflags=* ) LDFLAGS="${arg##--ldflags=}" ;;
+        "--" ) break ;;
+    esac
+done
+
 mkdir -p build
 cd build
 mkdir -p imports
-g++ -std=c++11 -I ../include -shared -fPIC -s -O3 ../regex.cpp -o ./imports/regex.cse
+$CXX $CXXFLAGS ../regex.cpp $LDFLAGS -o ./imports/regex.cse
+