Eclipse: "make: *** No rule to make target `all'. Stop."

Question

I'm using this tutorial for JNI in Eclipse:

https://www3.ntu.edu.sg/home/ehchua/programming/java/JavaNativeInterface.html#zz-2.6

(I'm using only the part "2.6 JNI in Eclipse").

And until this part of the tutorial:

Run the makefile for the target "all", by right-click on the makefile ⇒ Make >Targets ⇒ Build ⇒ Select the target "all" ⇒ Build

It seemed like everything worked well (meaning- the results were the same as in the tutorial and there were no warning or errors in the "Problems" tab).

But when I did this part, I noticed that the line :

javah -classpath ../bin HelloJNI

was missing from the printing in the console.

Then I continued to the next step of the tutorial- "Step 5: Run the Java JNI Program".

But even though it did print to the console "Hello World!", I noticed that there is an error in the "Problems" tab:

"make: *** No rule to make target `all'. Stop."

Development Environment

+Eclipse IDE for Java Developers (32 bit) Version: Kepler Service Release 2.

+CDT plugin for Eclipse

+Windows 10 64-bit (I use eclipse 32-bit because at some point, the 64-bit eclipse couldn't open and the solution was to use 32-bit eclipse)

makefile

# Define a variable for classpath
CLASS_PATH = ../bin

# Define a virtual path for .class in the bin directory
vpath %.class $(CLASS_PATH)

all : hello.dll

# $@ matches the target, $< matches the first dependency
hello.dll : HelloJNI.o
    gcc -Wl,--add-stdcall-alias -shared -o $@ $<

# $@ matches the target, $< matches the first dependency
HelloJNI.o : HelloJNI.c HelloJNI.h
    gcc -I"C:\Program Files (x86)\Java\jdk1.8.0_212\include" -I"C:\Program Files (x86)\Java\jdk1.8.0_212\include\win32" -c $< -o $@

# $* matches the target filename without the extension
HelloJNI.h : HelloJNI.class
    javah -classpath $(CLASS_PATH) $*

clean :
    rm HelloJNI.h HelloJNI.o hello.dll

HelloJNI.c

#include <jni.h>
#include <stdio.h>
#include "HelloJNI.h"

JNIEXPORT void JNICALL Java_HelloJNI_sayHello(JNIEnv *env, jobject thisObj) {
   printf("Hello World!\n");
   return;
}

HelloJNI.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloJNI */

#ifndef _Included_HelloJNI
#define _Included_HelloJNI
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     HelloJNI
 * Method:    sayHello
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_HelloJNI_sayHello
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

HelloJNI.java

public class HelloJNI {
   static {
      System.loadLibrary("hello"); // hello.dll (Windows) or libhello.so (Unixes)
   }

   // Declare native method
   private native void sayHello();

   // Test Driver
   public static void main(String[] args) {
      new HelloJNI().sayHello();  // Allocate an instance and invoke the native method
   }
}

Answer 1

suggest:

Before the makefile target all, insert the statement:

.PHONY: all

so the make utility is not trying to create a file named 'all'

Probably should add a similar statement before the target clean