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

[Florian Weimer <fw@deneb.enyo.de>]

* 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.