Add ISL to book
|Reported by:||thomas||Owned by:||lfs-book|
This is to follow a thread started by Xi Ruoyao:
Now GCC relys on ISL (https://repo.or.cz/isl.git) to enable graphite optimization, instead of Cloog-PPL and PPL.
We should update this in LFS Appendix C.
Better, just add it to the book in the 8.5 cycle and remove the note. It's a tiny addition.
Another issue: ISL is also an optional dependency of Binutils (to enable parallel linking of ld.gold). And, ISL must be built after GMP. So if we would do that the build sequence should be changed to:
Bc -> GMP -> ISL -> Binutils -> MPFR -> MPC -> Shadow -> GCC
I tried this once but it seems some GMP tests were skipped. So I rebuilt GMP after Binutils:
Bc -> GMP (some tests skipped) -> ISL -> Binutils -> GMP (final) -> MPFR -> ...