Re: error: 'jvariant::jvariant(jbyte)' cannot be overloaded

[Andrew Haley <aph@redhat.com>]

On 07/19/2009 09:17 AM, Florian Weimer wrote:
> * Andrew Haley:
> 
>> On 07/19/2009 07:02 AM, Florian Weimer wrote:
>>> * Mathieu Malaterre:
>>>
>>>>   I am trying to compile VTK using gcj and I am getting those compiler
>>>> error, could someone please let me know if the code is legal (should
>>>> compile) or not:
>>> This is legal per Sun's JNI specficiation: jboolean and jbyte are
>>> distinct types because there signedness differs:
>>>
>>> <http://java.sun.com/javase/6/docs/technotes/guides/jni/spec/types.html#wp198>
>>>
>>> It's a bug in GCC.
>> I didn't see the original message to which this is replying.
> 
> It's about C++ code which contains a function overloaded on jbyte and
> jboolean.  This fails with GCJ because they are typedef'ed to the same
> type.
> 
>> If you can make a test case I'll see if the bug can be fixed.
> 
> Compare the table I referenced with these pieces from jni_md.h:
> 
> | typedef int    jbyte  __attribute__((__mode__(__QI__)));
> | typedef int    jshort __attribute__((__mode__(__HI__)));
> | typedef int    jint   __attribute__((__mode__(__SI__)));
> | typedef int    jlong  __attribute__((__mode__(__DI__)));
> | typedef int    jboolean __attribute__((__mode__(__QI__)));
> | typedef unsigned short jchar __attribute__((__mode__(__HI__)));
> | typedef float  jfloat;
> | typedef double jdouble;
> | typedef jint jsize;
> 
> | typedef int8_t jbyte;
> | typedef int16_t jshort;
> | typedef int32_t jint;
> | typedef int64_t jlong;
> | typedef float jfloat;
> | typedef double jdouble;
> | typedef jint jsize;
> | typedef int8_t jboolean;
> | typedef uint16_t jchar;
> 
> jboolean is signed, but Sun's spec says it should be unsigned.

OK.  I can fix it, but it's an ABI-incompatible change.  There's no
way this fix could be applied to any existing releases, only gcc
4.5.

Andrew.