http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51218
--- Comment #12 from Steve Kargl <sgk at troutmask dot apl.washington.edu> 2011-11-19 16:08:06 UTC --- On Sat, Nov 19, 2011 at 10:57:23AM +0000, tkoenig at netcologne dot de wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51218 > > --- Comment #10 from tkoenig at netcologne dot de <tkoenig at netcologne dot > de> 2011-11-19 10:57:23 UTC --- > Am 19.11.2011 11:18, schrieb anlauf at gmx dot de: > > This won't work. The implementation of the management > > of temporaries does not allow that the same instance > > is used more than once. > > If I understand your code, you are modifying the arguments of your > function and evaluating that function more than once in a single > expression. This is illegal in Fortran, so gfortran could, in > principle, do anything with it. I would advise you to fix your code to > be standard-conforming. > > Because such code is unfortunately quite common, gfortran by default > does not do such optimizations unless directed to be. The fact that > it does here nonetheless is, indeed, a bug. > The code is also invalid because it manipulates the pointer (not the target) of a derived-type dummy argument with the intent(in) attribute. The code has at least two bugs and the PR should be closed.
