My first question in stack overflow... Kind of excited but still struggling in the problem.
Alright, My question is how to pass parameters from command line to a java program through makefile.
Honestly I don't really know wether my description is correct....... Cause I don't really know much about makefile... In my assignment, the description is that we must develop a Makefile for GNU make to build our program. For example, the command lines
make
mipsim -v < test1.cmd > test1.log
will build the ISS (a simulator we made) and then run it with debugging output, taking input commands from the file test1.cmd and writing result to test1.log.
I have finished the program but I don't know how to make the things above happen. What I know so far is just to use makefile to make the .class file from .java file.... I have no idea about how to get test1.cmd as my input file's name and test1.log as my output file's name from command lines.... I guess these two names probably will get into my program through String[] args in the main function...
Could anybody give me some help please?
Thanks
There is some confusion as to the issues.
First, compile Java using make is a little... iffy. (Most people use ant or maven.) However, if you don't mind a little overhead, you can do it using make. You probably should run make from a directory at the root of the Java package hierarchy. You can determine all Java files below using make macros. Hint: shell:
JAVA_FILES = $(shell find -name \*.java)
Then you run javac. (Make sure to define all path names to compilers etc. using make macros.) With Java, it's not easy to derive a make target, because .class files are not 1:1 w.r.t. java files. I just use a target "compile", depending on all the java files, and touch a file acting as a dummy target.
Second, the execution. To invoke a Java program that is not in an executable jar, you set the classpath (option -cp), specify the main class name and add command line parameters. I'd have to know what "mipsim" is - probably a shell script for doing just that. Anyway, a make target could be the log file:
%.log : %.cmd
${JAVA_HOME}/bin/java -cp ${ROOT} <$< >$@
Now, make test1.cmd should run your program.
Note: Redirection is not specified by program arguments; this is handled by the shell.
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