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Subject: Re: [OMPI users] warnings and anachronisms in openmpi-1.7.4
From: Oscar Vega-Gisbert (ovega_at_[hidden])
Date: 2014-02-09 12:45:47


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.


Quoting Siegmar Gross <Siegmar.Gross_at_[hidden]>:

> 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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