[Bug middle-end/64017] Support ISL 0.14.0 (to fix ICE with gfortran.dg/graphite/pr42393.f90)

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64017

howarth at bromo dot med.uc.edu changed:

           What    |Removed                     |Added
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                 CC|                            |howarth at bromo dot med.uc.edu

--- Comment #1 from howarth at bromo dot med.uc.edu ---
It appears that Polly in llvm is only coded for isl libraries containing the
newer isl_schedule_constraints_compute_schedule() call without fallback support
for the older isl_union_set_compute_schedule() call. If we want to support isl
0.12.2 as well as 0.14, we could add a test for the presence of
isl_union_set_compute_schedule() to config/isl,m4 and use that to set define in
auto-host.h that could be leveraged in gcc/graphite-optimize-isl.c to determine
which code path to use.