Re: [patch] [java] bump libgcj soname

On 02/01/16 14:40, Matthias Klose wrote:
> 
> preparing for a test rebuild of the archive, and trying to run gcj-dbtool (from 
> GCC 5) with libgcj16 (from GCC 6):
> 
> $ gcj-dbtool -n /tmp/foo.db
> libgcj failure: gcj linkage error.
> Incorrect library ABI version detected.  Aborting.
> 
> Aborted (core dumped)
> 
> natClassLoader.cc:_Jv_CheckABIVersion checks the ABI version, which is defined as
> 
> libjava/include/jvm.h:#define GCJ_CXX_ABI_VERSION (__GNUC__ * 100000 + 
> __GNUC_MINOR__ * 1000)
> 
> so this will be seen with everything directly linked to libgcj with a libgcj16 
> upgraded to GCC 6. So what to do? Bump the soname, or discard this check?

I'd bump the soname.

> In any case, GCJ_CXX_ABI_VERSION should be changed to not include __GNUC_MINOR__ 
> anymore.  Maybe for the gcc-5-branch, set it unconditionally to 3 so that it 
> won't change anymore with future releases from the gcc-5 branch?

That's safe only if Classpath and libgcj are not changed at all.  I guess
we can guarantee that on the gcc-5 branch?

Andrew.