dereferencing type-punned pointer will break strict-aliasing rules

Thu Oct 12 23:05:00 GMT 2006

Andrew,
 I wonder why it only produces a single warning...
../../../gcc-4.2-20060928/libjava/gnu/classpath/jdwp/natVMVirtualMachine.cc:46: warning: dereferencing type-punned pointer will break strict-aliasing rules
if the problem exists throughout the libjava sources? Or do
you seem more occurances on your architecture?
 Jack
On Thu, Oct 12, 2006 at 10:53:19AM +0100, Andrew Haley wrote:
> This evil is all over the place:
>> JNIEnv *env;
> vm->GetEnv((void **)&env, JNI_VERSION_1_1);
>> [ FWIW, The JNI version of GetEnv looks like this:
>> Prototype jint GetEnv(JavaVM *vm, void **penv, jint interface_id);
>> Description If the current thread is not attached to the given virtual
> machine instance, sets *penv to NULL, and returns JNI_EDETACHED. If
> the specified interface is not supported, sets *penv to NULL, and
> returns JNI_EVERSION. Otherwise, sets *env to the appropriate
> interface, and returns JNI_OK. ]
>> We probably ned to go over the whole gcj tree and fix them all. :-(
>> Andrew.