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Re: Using JNF (Was: Calling Java from native code)

Subject: Re: Using JNF (Was: Calling Java from native code)
From: "Paul J. Lucas" <email@hidden>
Date: Mon, 2 Nov 2009 18:34:28 -0800
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On Nov 2, 2009, at 2:25 PM, Greg Guerin wrote:

I see a 300+ KB file at JavaVM.framework/Versions/A/Frameworks/ JavaNativeFoundation.framework/Versions/A/JavaNativeFoundation. And the 'file' command tells me it's a fat mach-O dylib, which is exactly what I would expect for a framework.


OK.  I have that.  I didn't realize *that* contained the code.

If you don't have that, then maybe you have a damaged install, or a version of Java that doesn't have JNF.

After some more probing, I noticed JNFAutoreleasePool.h that has the declarations:

JNF_EXPORT JNFAutoreleasePoolToken *JNFNativeMethodEnter();
JNF_EXPORT void JNFNativeMethodExit(JNFAutoreleasePoolToken *token);

where JNF_EXPORT is defined in JNFJNI.h as:

#define JNF_EXPORT extern

This is wrong when compiling using a C++ compiler. However, the context for the declaration in JNFJNI.h is:

#if !defined(JNF_EXPORT)
        #define JNF_EXPORT extern
#endif

If in my own code I do:

#ifdef __cplusplus
#   ifdef JNF_EXPORT
#       undef JNF_EXPORT
#   endif
#   define JNF_EXPORT extern "C"
#endif
#import <JavaNativeFoundation/JavaNativeFoundation.h>

then recompile and link, it links correctly. It would seem that the JNFJNI.h header is wrong in that it ignores the possibility of compiling with a C++ compiler (but at least allows a work-around).

File a bug?

- Paul
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References:
	>Re: Using JNF (Was: Calling Java from native code) (From: Greg Guerin <email@hidden>)

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