dbe4bf45a3
GCC 9.3 seems to be able to compile rtree.c with -O2: - No new regressions in ATF. - System survives over a night, at least, under heavy loads. On the other hand, unfortunately, GCC 9.3 still miscompiles tcache.c with -O2 or -O1. For example, even ``gcc -g hello.c'' fails with ICE if tcache.c is compiled with -O[12] in libc.