编译NanoVM Java虚拟机

Question

I have problem with compiling NanoVM project from:

http://www.harbaum.org/till/nanovm/index.shtml

NanoVM is Java implementation for AVR microcontrollers. I know this is not efficient. I have problem with "makefile" file. This makefile contains instructions to compile Java .class from source .java files. But i don't know, how can i run makefile? I was using previously javac.exe compiler to write java standard applications. In install instructions writes that I must have Java SDK (J2SE). Is there any difference between SDK and JDK? I have JDK installed, i have read earlier that there isn't any difference between SDK and JDK, but i'm not sure. I know makefile files are used to manage compilation, i previously used makefile to compile programs wrote in C, but is there some Java compiler like gcc? Sorry for my stupid question, i'm quite newbie in makefiles, i think solution is very simple. My makefile:

#
# Makefile for NanoVMTool
#

APP = NanoVMTool
VERSION = 1.5

all: ../$(APP).jar

CLASSPATH = ../../java/examples
NATIVEPATH = ../../java/native

JAVAFILES = AccessFlags.java CodeInfo.java ConstPoolEntry.java FieldInfo.java \
            MethodInfo.java AttributeInfo.java CodeTranslator.java \
        ConstPoolEntryError.java InnerClassInfo.java NanoVMTool.java \
        ClassFileReader.java CommonInfo.java ConvertException.java \
        LineNumberInfo.java NativeMapper.java ClassInfo.java \
        Config.java Debug.java LocalVariableInfo.java UVMWriter.java \
        ClassLoader.java ConstPool.java ExceptionInfo.java \
        MethodIdTable.java Uploader.java NVMComm2.java

# compile target code
$(CLASSPATH)/%.class: $(CLASSPATH)/%.java
    javac -classpath $(CLASSPATH):$(NATIVEPATH) $<

%.class: %.java
    echo "public class Version {" > Version.java
    echo "  public static String version = \"V$(VERSION)\";" >> Version.java
    echo "}" >> Version.java
    javac $<

../$(APP).jar: $(APP).class
    jar cmf $(APP).mf ../$(APP).jar *.class

# convert and upload a class file (should be moved to vm/target Makefile)
asuro-%: $(CLASSPATH)/%.class $(APP).class
    java $(APP) ../config/Asuro.config $(CLASSPATH) $*

mega8-%: $(CLASSPATH)/%.class $(APP).class
    java  $(APP) ../config/Mega8.config $(CLASSPATH) $*

clean:
    rm -f *.class *~

Answer 1

In order to run a Makefile (on Linux / UNIX), you first need to install "make" and any of the other tools that it uses. In this case, the tools are just the java , javac and jar commands. For the last two, you need a JDK installation.

But i don't know, how can i run makefile?

Change directory to the directory containing the Makefile, then run 'make' with the appropriate target. In this case make all .

Is there any difference between SDK and JDK?

There is no such thing as the Java SDK.

... but is there some Java compiler like gcc?

The Java compiler is javac . That is what your makefile is using.

---

Sorry for my stupid question, i'm quite newbie in makefiles, i think solution is very simple.

The REAL solution is to find and read a tutorial on Makefiles and how to read, write and use them. (In general, the solution to asking newbie questions is to educate yourself so that you aren't a newbie!)