Have a look at the thread that starts here: http://sources.redhat.com/ml/cygwin/2003-03/msg00795.html
If that doesn't help you, please report back :)
(In short, that thread lead to the conclusion that there was a problem with the calling convention used. Your linker flag to add stdcall versions of the functions is not too far off the final result).
HTH
rlc
Andrew Hinton wrote:
I have been attempting to port a large program from Linux to Windows using Cygwin. The program is written in Java, C and C++; using the JNI to link them together.
I have successfully compiled and linked all of the C
and C++ code using Cygwin, and successfully executed a
test program written in C++.
The following illustrates the compiler flags I was using:
g++ -c -D__int64="long long" ###includes### *.cc gcc -Wl,--add-stdcall -shared -o ~/prism/lib/file.dll *.o -L ~/prism/lib -lutil -lepd
The problem comes when the JNI tries to load the
shared dlls in the loadLibrary() method. The JNI
appears to be able to find the libraries, as no
UnsatisfiedLinkError is reported; however, the
execution halts, giving no output.
It appears that JNI has problems with cygwin1.dll, because I have had no JNI problems with dlls not created using Cygwin.
After searching the Internet and this mailing list, most sources seem to point out that I should use the -mno-cygwin compiler flag. This appears to remove the need for the cygwin1.dll at runtime. However, this results in compile errors. For example:
$ gcc -c -D__int64="long long" -I../mnemosyne/ *.c
This works fine … but this doesn’t:
$ gcc -mno-cygwin -c -D__int64="long long" -I../mnemosyne/ *.c datalimit.c:17:26: sys/resource.h: No such file or directory pipefork.c:12:22: sys/wait.h: No such file or directory test-res.c:5: error: syntax error before '(' token test-res.c:9: error: syntax error before '{' token test-res.c:13: error: conflicting types for `prog' test-res.c:11: error: previous declaration of `prog' test-res.c:13: warning: data definition has no type or storage class test-res.c:14: error: syntax error before "if" test-res.c:16: error: syntax error before numeric constant test-res.c:16: error: conflicting types for `exit' /usr/i686-pc-mingw32/include/stdlib.h:357: error: previous declaration of `exit' test-res.c:16: warning: data definition has no type or storage class test-res.c:18: error: syntax error before string constant test-res.c:18: error: conflicting types for `util_restart' util.h:240: error: previous declaration of `util_restart' test-res.c:18: warning: data definition has no type or storage class test-res.c:20: error: initializer element is not constant test-res.c:20: warning: data definition has no type or storage class test-res.c:21: error: syntax error before "void" test-res.c:25: error: syntax error before '!=' token test-res.c:30: error: redefinition of `i' test-res.c:20: error: `i' previously defined here test-res.c:30: warning: data definition has no type or storage class test-res.c:31: error: syntax error before "for" test-res.c:31: error: syntax error before '!=' token
The problem seems to be that a lot of the program uses routines that (I think) are not part of the windows API, specifically the following headers are used:
sys/files.h sys/file.h stream.h unisd.h sys/time.h sys/resource.h sys/times.h types.h times.h sys/wait.h a.out.h pwd.h
I have searched the Internet, the Cygwin manual and Cygwin’s FAQ and I have found nothing that explains the problem with JNI and cygwin1.dll. Could anyone either point me in the right direction or say whether I am doing anything wrong. Or does anyone know if there is a way to make this work without the need for the cygwin1.dll?
I have attached the cygcheck file.
Thanks,
Andrew Hinton
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