On Fri, Sep 29, 2017 at 11:15:47AM +0200, Janus Weil wrote: > Hi Steve, > > > As aside effect, the patch removes a questionable GNU Fortran > > extension that allowed arguments to IAND, IOR, and IEOR to have > > different kind type parameters. The behavior of this extension > > was not documented. > > I don't really like that part. We were using the nice and convenient > mechanism of gfc_notify_std here, which allows the developer to choose > via the -std flag whether to strictly adhere to a chosen Fortran > standard or to allow GNU extensions etc. You're taking away that > flexibility and replacing it by an unconditional error. I don't > actually think that's a good idea. > > In general one can argue about whether or not it's a good idea to use > non-std extensions. But I think gfortran should rather leave the > choice to its users, whether they want to use 'dirty and covenient' > code or have very strict checking. We have nice mechanisms for this, > and I do think we should keep them. >
It is undefined behavior. I withdraw the patch. -- Steve 20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4 20161221 https://www.youtube.com/watch?v=IbCHE-hONow
