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Java Forum / General / November 2005jni.h problem
Hi, My g++ compiler doesn't know where my jni.h file is. I don't know how to explicit tell to g++ that jni.h is in the include folder of java. I get the error HelloWorld.c:1:17: error: jni.h: No such file or directory What should I do ? (I am working on Linux) thanks MArcelo > My g++ compiler doesn't know where my jni.h file is. I don't know > how to explicit tell to g++ that jni.h is in the include folder of > java. The standard compiler flag for extending the header search path is -I. You need to add two directories, like this: -I $JAVA_HOME/include -I $JAVA_HOME/include/linux (assuming an appropriately set JAVA_HOME) /gordon  Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > Hi, > [quoted text clipped - 7 lines] > > What should I do ? (I am working on Linux) man gcc helps ;) If you ask again in comp.lang.c, you will probably be flamed to death, then told about the magic -I switches to gcc (and most other C compilers), which add directories to the search path. Since i am in a good mood right now: -I<path/to/your/java/install>/include and -I<path/to/your/java/install>/include/linux SignatureYou can't run away forever, But there's nothing wrong with getting a good head start. --- Jim Steinman, "Rock and Roll Dreams Come Through" thanks, I would like to avoid the command -I How can I do it? Should I add my /usr/local/.../java.../include in the path variable, or should I create a new variable? thanks a lot Marcelo > I would like to avoid the command -I > How can I do it? Should I add my /usr/local/.../java.../include in the > path variable, or should I create a new variable? Your PATH has nothing to do with this. What are your reasons for wanting to avoid using -I, when it is clearly the correct solution? Write a Makefile, and add the -I options to your CFLAGS variable. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e thanks for the make file, now i am getting another problem , a little bit strange ~/docs/jni/jniexamples/chap2/HelloWorld$ gcc -I/usr/local/share/jdk1.5.0_05/include -I/usr/local/share/jdk1.5.0_05/include/linux HelloWorld.c /usr/lib/gcc/i486-linux-gnu/4.0.2/../../../../lib/crt1.o: In function `_start': ../sysdeps/i386/elf/start.S:115: undefined reference to `main' collect2: ld returned 1 exit status the program is the HelloWorld application the Sun Tutorials. thanks a lot, Marcelo > thanks for the make file, > [quoted text clipped - 9 lines] > > the program is the HelloWorld application the Sun Tutorials. Because you didn't tell the compiler you wanted a shared library it tried to compile a program, which needs a main(). Compile your code like this: gcc -fPIC -D_REENTRANT -I $JAVA_HOME/include -I $JAVA_HOME/include/linux -c HelloWorld.c Then link the shared library like this: gcc -shared HelloWorld.o -o libhello.so Or compile and link with a single command: gcc -fPIC -shared -D_REENTRANT -I $JAVA_HOME/include -I $JAVA_HOME/include/linux HelloWorld.c -o libhello.so (note that each command should be a single line) /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > gcc -shared HelloWorld.o -o libhello.so and that is deliberate, you use the same gcc for linking as compiling? SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. >> gcc -shared HelloWorld.o -o libhello.so > > and that is deliberate, you use the same gcc for linking as compiling? Yes. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > thanks for the make file, > [quoted text clipped - 13 lines] > > Marcelo got the solution I should use the -shared option in the compilator thanks Marcelo Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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