That you use code that does unsafe conversions really has nothing to do with 
the business of the MPI Forum. 

Again, if you think C89 is the best C, then use and teach that. No one here is 
trying to make you use C11.

Jeff

> On Aug 8, 2019, at 5:56 AM, N.M. Maclaren via mpi-forum 
> <mpi-forum@lists.mpi-forum.org> wrote:
> 
>> On Aug 7 2019, Jeff Hammond via mpi-forum wrote:
>> 
>> "silently truncated at run time" is trivially addressed with -Wconversion
>> or -Wshorten-64-to-32.  The example program below is addressed by this.
> 
> Unfortunately, no.  While I have no trouble using such options on MY
> code, I have frequently found them unusable on imported packages, because
> of the flood of non-errors they generate.  For example, the following
> code is both common and reasonable, and includes narrowing conversions:
> 
>   int i;
>   i = sizeof(double);
>   float x;
>   x = 1.0;
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