Re: [GCCWiki] Page change How+to+BC+compile+with+GCJ

["John M. Gabriele" <john_sips_tea at yahoo dot com>]

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--- anonymous@sourceware.org wrote:

> Page change How+to+BC+compile+with+GCJ
> Edited by: RobinGreen
> http://gcc.gnu.org/wiki/How%20to%20BC%20compile%20with%20GCJ?action=diff
> 
> How to BC compile with GCJ 11 2005-04-13T05:18:41+00:00
> How to BC compile with GCJ 12 2005-07-24T13:55:27+00:00
> @@ -59,6 +59,30 @@
>   
>   !!Examples
>   
>   Interested in some real life examples?
> - Head over to the [GNU Classpath
> Showcase|http://developer.classpath.org/mediation/ClasspathShowcase] page.
> + Head over to the [GNU Classpath Showcase|] page.
>   There you can see how easy it is to build native Eclipse.
> + 
> + !!Troubleshooting
> + 
> + !1. How can I tell whether code is running in interpreted mode or native
> mode?
> + 
> + Run the app under gdb and set a breakpoint in your code. Breakpoints set on
> interpreted code will not work at all (however, some breakpoints may fail to
> work anyway due to other gdb bugs, so don't rely on that as an indication),
> and interpreted code will appear in gdb backtraces as
> <code>~_Jv_InterpMethod::run</code> or similar.
> + 
> + Alternatively, there is a quirk in gij 4.0 that you can take advantage of.
> Stack traces from gij will show "(Unknown Source)" for lines that are being
> interpreted, and line numbers for native libraries that have been compiled
> with -g (at *both* the source->bytecode compiling stage and the
> bytecode->native compiling stage). *NOTE:* This "(Unknown Source)" quirk will
> go away in 4.1.
> + 
> + !2. My code is running in interpreted mode, even though I followed the
> instructions above. Why?
> + 
> + In gcc 4.0, no errors are reported for <code>.jar.so</code> files that fail
> to load for some reason - they are just silently ignored. This policy may be
> changed in future.
> + 
> + There are two likely reasons for code to be incorrectly running in
> interpreted mode:
> + 
> + a) You forgot to compile code that uses JNI (Java Native Interface) with
> the <code>-fjni</code> compiler option. In this case the VM will repeatedly
> try, and fail, to load and link the library, each time it tries to load a
> class corresponding to that library. (The library fails to link because it
> tries to link in CNI style, which fails.)
> + 
> + or
> + 
> + b) Your mapping file (e.g. <code>classmap.db</code>) is out of date, or not
> on the <code>gnu.gcj.compiled.db.path</code>
> + 
> + !3. When I run my application under gdb, gdb is loading my library many
> times, over and over again
> + 
> + You probably forgot to specify <code>-fjni</code> when you compiled. See
> 2.a. above.
> 
> 



		
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