[Bug java/28153] New: Under Windows Xp the generated JNI headers need to have a '_' prepended for each function.

[bcmpinc at hotmail dot com]

I had some problems when I tried to compile a JNI-example from wikipedia:
  http://en.wikipedia.org/wiki/JNI

I compiled the Java-source containing the native function 
with 'gcj -C' (gcc version 3.4.2 (mingw-special)):
  public native void sayHello();

I passed the class-file to 'gcjh -jni' and it produced a header with the line:
  extern JNIEXPORT void JNICALL Java_JavaSide_sayHello (JNIEnv *env, jobject);

I implemented the function, compiled it with 'g++ -O2 -shared'
When I tried to run the java class it gave an error when it called the native
function.

I examined some other dll's used by java (with depens.exe) and all the
functions 
had a '_' prepended.
I changed the line in the header file to:
  extern JNIEXPORT void JNICALL _Java_JavaSide_sayHello (JNIEnv *env, jobject);

Recompiled the C++ source and ran the java class. This time the function worked 
without any problems.


-- 
           Summary: Under Windows Xp the generated JNI headers need to have
                    a '_' prepended for each function.
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bcmpinc at hotmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28153