many are not using gnu-java, the orginial sun-java, it is certainly more baroc !
anyway, I am trying to link a DLL with gcc then to load it with
Java(TM) system.loadlibray() but got eventually the error...
...
[Loaded java.lang.UnsatisfiedLinkError from shared objects file]
...
I have attached a benchmark taken from the archives...
http://cygwin.com/ml/cygwin/2003-02/msg02235.html
and run make test,
I wonder what is the missing command in the linker which allows JNI to
load all the cygwin objects?
Christian Montanari.
---HelloWorld.java---
public class HelloWorld
{
private static String libraryName = Native;
/**
* Failure callback strategy that writes a message to sysout, then
calls
* System.exit(1).
*/
public static Runnable EXIT_JVM = new Runnable() {
public void run() {
System.out.println(Could not load ' + libraryName + ');
System.out.println(java.library.path =
+ System.getProperty(java.library.path));
System.exit(1);
}
};
public static Runnable THROW_ERROR = new Runnable() {
public void run() {
throw new UnsatisfiedLinkError(Could not load ' + libraryName
+ ');
}
};
private static Object callbackLock = new Object();
private static Runnable failureCallback = EXIT_JVM;
private static native void sayHello();
public static void main( String[] args )
{
try {
//System.loadLibrary( libraryName , true);
System.loadLibrary( libraryName );
} catch (UnsatisfiedLinkError e) {
synchronized (callbackLock) {
if (failureCallback != null) {
failureCallback.run();
}
}
}
sayHello();
}
}
--HelloWorld.c-
#include iostream
using namespace std;
#include HelloWorld_jni.h
JNIEXPORT void JNICALL
Java_HelloWorld_sayHello( JNIEnv *env, jclass c )
{
cerr Hello World from C! endl;
}
--Makefile-just do make test
JAVA_HOME?='c:/PROGRA~1/Java/jdk1.6.0_24'
clean:
set nonomatch;\
rm -rf ./bin Native.dll *.o *_jni.h
HelloWorld.class: HelloWorld.java
javac HelloWorld.java
HelloWorld_jni.h :HelloWorld.class
javah -classpath . -o HelloWorld_jni.h HelloWorld
Native.dll: HelloWorld.c HelloWorld_jni.h Makefile
$(CXX) \
-D_REENTRANT -D_GNU_SOURCE -D__int64='long long' \
-I${JAVA_HOME}/include -I${JAVA_HOME}/include/win32
-I. \
$ $(LDFLAGS) -o $@
Native.dll:LDFLAGS=-mno-cygwin
Native.dll:LDFLAGS=-shared
Native.dll:LDFLAGS=-shared -Wl,--add-stdcall-alias
Native.dll:LDFLAGS=-shared
-Wl,--verbose,--warn-unresolved-symbols,--add-stdcall-alias
Native.dll:LDFLAGS=-shared
-Wl,--verbose,--warn-unresolved-symbols,--add-stdcall-alias,--add-indirect
Native.dll:LDFLAGS=-shared
-Wl,--verbose,--warn-unresolved-symbols,--add-stdcall-alias,--add-stdcall-underscore
Native.dll:LDFLAGS=-shared
-Wl,--verbose,--warn-unresolved-symbols,--add-stdcall-alias,--add-underscore
Native.dll:LDFLAGS=-shared
-Wl,--verbose,--error-unresolved-symbols,--add-stdcall-alias
--add-underscore
Native.dll:LDFLAGS=-shared
-Wl,--verbose,--error-unresolved-symbols,--add-stdcall-alias,--export-dynamic
Native.dll:CXX=
Native.dll:CXX=g++ --verbose
comma:= ,
semicomma:= ;
empty:=
space:= $(empty) $(empty)
test:LD_LIBRARY_PATH:=$(subst $(space),$(semicomma),$(addprefix
'c:/cygwin',/usr/lib/gcc/i686-pc-cygwin/4.3.4
/usr/lib/gcc/i686-pc-cygwin/4.3.4
/usr/lib/gcc/i686-pc-cygwin/4.3.4/../../../ /lib/ /usr/lib/))
test: Native.dll
LD_LIBRARY_PATH=$(LD_LIBRARY_PATH) java -verbose -classpath
. -Xmx256m -Djava.library.path=. HelloWorld
ifneq (,)
nm -u Native.dll
w __Jv_RegisterClasses
w __ZdaPv
w __ZdaPvRKSt9nothrow_t
w __ZdlPv
w __ZdlPvRKSt9nothrow_t
w __Znaj
w __ZnajRKSt9nothrow_t
w __Znwj
w __ZnwjRKSt9nothrow_t
U ___crt_xc_end__
U ___crt_xc_start__
U ___crt_xi_end__
U ___crt_xi_start__
U ___crt_xl_start__
U ___crt_xp_end__
U ___crt_xp_start__
U ___crt_xt_end__
U ___crt_xt_start__
U ___tls_end__
U ___tls_start__
U __end__
endif
--
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