[Mpi-forum] Giving up on C11 _Generic

Jeff Hammond jeff.science at gmail.com
Thu Aug 8 08:37:46 CDT 2019

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.


> On Aug 8, 2019, at 5:56 AM, N.M. Maclaren via mpi-forum <mpi-forum at 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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