[PATCH] [Polly] Update ISL to isl-0.15-3-g532568a

[Tobias Grosser]

In http://reviews.llvm.org/D10505#190225, @Meinersbur wrote:

> In http://reviews.llvm.org/D10505#190085, @grosser wrote:
>
> > It seems you somehow changed the format of isl_config.h. When importing isl I just copied this file from an isl_config.h.in. It seems you now use a slightly different approach to obtain the contents of this file which causes changes all over this file.
>
>
> It is the output of ./configure on my machine.
>
> Using isl_config.h.in straight away is about the least favorable thing you can do. It just defines nothing. I am surprised it worked.


The intention was to define as little as possible. My feeling was that isl would not use (or need) most of these macros anyhow, so I wanted to leave them undefined such that it clearly breaks if there arises a need at some point. In that case, we can then figure out how to derive them through cmake.

Using the configure of your machine just means it will work on your machine, but it seems there is a risk that your machine has certain features that are not available on other machines and consequently would break the build there if enabled.

As said before, I am happy to have this improved (and with your cmake-ificaton of isl you may have some good ideas), but let's not change our approach within a massive update of isl. Those two things are orthogonal.


http://reviews.llvm.org/D10505

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