Quoting Siegmar Gross <siegmar.gr...@informatik.hs-fulda.de>:
Hi Oscar,
The warnings of type "cast to pointer from integer of different size"
are provoked when a jlong (64 bit handle in Java) is copied to a C
pointer (32 bit) or vice versa.
These warnings could be avoided with methods like these:
void* ompi_java_cHandle(jlong handle)
{
union { jlong j; void* c; } u;
u.j = handle;
return u.c;
}
jlong ompi_java_jHandle(void *handle)
{
union { jlong j; void* c; } u;
u.c = handle;
return u.j;
}
We should change all the code in this manner:
JNIEXPORT jlong JNICALL Java_mpi_Win_free(
JNIEnv *env, jobject jthis, jlong handle)
{
MPI_Win win = ompi_java_cHandle(handle);
int rc = MPI_Win_free(&win);
ompi_java_exceptionCheck(env, rc);
return ompi_java_jHandle(win);
}
I don't know if it is worth it.
I don't know either, but you will possibly get an error if you store
a 64-bit value into a 32-bit pointer. If the Java interface should be
available on 32-bit systems as well, it would be necessary (at least
in my opinion).
There is no loss of information, because the 64-bit values (java long)
come from 32-bit values (c pointers). It works ok.
The question is if we want avoid these warnings.
Kind regards
Siegmar
Regards,
Oscar
Quoting Siegmar Gross <siegmar.gr...@informatik.hs-fulda.de>:
> Hi,
>
> yesterday I compiled 32- and 64-bit versions of openmpi-1.7.4 for
> my platforms (Solaris 10 sparc, Solaris 10 x86_64, and openSUSE
> Linux 12.1 x86_64) with Sun C 5.12 and gcc-4.8.0. I could build
> a 64-bit version for Linux with gcc without warnings. Everything
> else showed warnings. I received many warnings for my 32-bit
> versions (mainly for the Java interface with gcc). I have combined
> all warnings for my platforms so that it is easier to fix them, if
> somebody wants to fix them. The attached files contain the warnings
> from each compiler. I can also provide specific files like
> Solaris.x86_64.32_cc.uniq or even my log files (e.g.,
> log.make.SunOS.x86_64.32_cc).
>
>
> Kind regards
>
> Siegmar
>
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