Hi William,
I asked this question a week or so ago (shortly after the conference ended).
The general feeling was that OSX on Intel could *NOT* run JNI libraries
through Rosetta. This is because Rosetta requires that the entire program,
at the point of launch, is either translated or not. There's no way for
Rosetta to determine, at launch time, if any JNI libraries require
translation (and the JVM obviously is Universal already), therefore it will
be running natively. The JNI libraries will probably fail to load if they
aren't universal.
As far as GCC -- I gathered that because XCode uses GCC behind the scenes,
there's definitely a way to make it work -- the specifics of "how to make it
work" seem to be left to trial & error.
Thanks,
Sam
> -----Original Message-----
> From: java-dev-bounces+sberlin=email@hidden
> [mailto:java-dev-bounces+sberlin=email@hidden]
> On Behalf Of William C. McCain
> Sent: Wednesday, June 15, 2005 10:42 PM
> To: Eric Albert; email@hidden
> Subject: Re: Converting a jnilib to Intel
>
> Eric,
>
> Before posting my questions, I *DID* download, print, and
> read the "Universal Binary Programming Guidelines". But it
> did not answer ANY of my questions!
>
> For instance, regarding Rosetta and JNI libraries, the
> "Guidelines" states:
>
> Rosetta does not run the following:
> ...
> * Bundled Java applications or Java applications with JNI
> libraries that can't be translated
>
> I took that as a very ambiguous statement. Obviously,
> bundled Java applications, in general, WILL run on Mac OS X
> under Intel, because Apple will port (or has already ported)
> the JVM and all required, system level native libraries to
> Intel -- so no translation is required of Java applications,
> bundled or not, by Rosetta. Of course, that applies to "pure
> Java" applications, not ones like mine that have their own
> native libraries. But the above statement also refers to
> "Java applications with JNI libraries that can't be
> translated" -- which CLEARLY (to me) says that "some JNI
> libraries can be translated, and some cannot". But which
> ones can and which ones can't?
>
> Secondly, the "Universal Binary Programming Guidelines" talks
> extensively about building an Xcode project to build a
> universal binary for a Cocoa application. Nothing at all
> about Java! Or JNI libraries!
>
> No mention of the GCC options needed to build a universal
> binary, either
> -- the "Guidelines" are all written in terms of setting Xcode
> variables.
> There is no description of what compiler options are
> actually GENERATED by these variables! As I stated, I
> absolutely refuse to use an "IDE". I run compilers and all
> other tools from the command-line, as God intended. IDEs are VILE!
>
> Bill
>
> Eric Albert wrote:
> > In article <email@hidden>,
> > "William C. McCain" <email@hidden> wrote:
> >
> >
> >>I develop and sell three products that run on Mac OS X. All three
> >>products are written in Java and are distributed in the
> form of a Mac
> >>OS X "bundled application". Obviously, the Java code will need no
> >>conversion to run "natively" on Mac machines with Intel
> processors.
> >>But all three products use my own JNI library, written in
> C, for serial I/O.
> >>
> >>1. Will Rosetta automatically translate my
> "libserial.jnilib", which
> >>is compiled for a PowerPC, when my products are run on an
> Intel-based Mac?
> >
> >
> > No. Java is not supported by Rosetta. This is mentioned in the
> > Rosetta section of the Universal Binary Programming
> Guidelines, which
> > you can find at <http://developer.apple.com/>.
> >
> >
> >>2. If not, how do I convert "libserial.jnilib" to the
> "universal binary"
> >>format? Do I simply recompile it with the latest GCC
> (4.0)? If so,
> >>what GCC options must I specify to get a JNI-compatible
> "universal binary"?
> >
> >
> > Read the Universal Binary Programming Guidelines.
> Everything you need
> > to know about building universal binaries should be in there.
> >
> > Hope this helps,
> > Eric
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