Hi Jin,
I think this error is because of new version isl 0.20, please see the discussion here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86724
This issue is fixed in GCC 7.4, the patch could be found here: https://github.com/gcc-mirror/gcc/commit/d6470854446446a4e8b3b958a00e5013ed86ae7f
You can try to apply the change then build.
Jason