Add debug, release and install targets.

Makefile

@@ -2,11 +2,28 @@ SRCS := $(wildcard js*.c utf*.c regex.c)
 HDRS := $(wildcard js*.h mujs.h utf.h regex.h)
 OBJS := $(SRCS:%.c=build/%.o)
 
+prefix ?= /usr/local
+bindir ?= $(prefix)/bin
+incdir ?= $(prefix)/include
+libdir ?= $(prefix)/lib
+
 CC := clang
-CFLAGS := -std=c99 -pedantic -Wall -Wextra -Wunreachable-code -Wno-unused-parameter -g
+CFLAGS := -std=c99 -pedantic -Wall -Wextra -Wunreachable-code -Wno-unused-parameter
+
+ifeq "$(build)" "debug"
+CFLAGS += -g
+else
+CFLAGS += -O3
+endif
 
 default: build build/mujs build/mujsone
 
+debug:
+	$(MAKE) build=debug
+
+release:
+	$(MAKE) build=release
+
 astnames.h: jsparse.h
 	grep '\(AST\|EXP\|STM\)_' jsparse.h | sed 's/^[ \t]*\(AST_\)\?/"/;s/,.*/",/' | tr A-Z a-z > $@
 
@@ -33,8 +50,13 @@ build/mujs: build/main.o build/libmujs.a
 build/mujsone: build/main.o build/one.o
 	$(CC) -o $@ $^ -lm
 
-build/re: regex.c utf.c utftype.c
-	$(CC) $(CFLAGS) -DTEST -o $@ $^
+install: release
+	install -d $(DESTDIR)$(incdir)
+	install -d $(DESTDIR)$(libdir)
+	install -d $(DESTDIR)$(bindir)
+	install -t $(DESTDIR)$(incdir) mujs.h
+	install -t $(DESTDIR)$(libdir) build/libmujs.a
+	install -t $(DESTDIR)$(bindir) build/mujs
 
 tags: $(SRCS) main.c $(HDRS)
 	ctags $^
@@ -45,4 +67,4 @@ test: build/js
 clean:
 	rm -f astnames.h opnames.h one.c build/*
 
-.PHONY: default test clean
+.PHONY: default test clean install debug release