I had to comment out tests for C11 features in the following files because they were failing: std/depr/depr.c.headers/float_h.pass.cpp std/language.support/support.limits/c.limits/cfloat.pass.cpp They should be fixed and re-enabled.
The tests were commented out here: https://reviews.llvm.org/D50748
commit a5faf3c849298d1106e74068f3ecffa13e1684a6 Author: Louis Dionne <ldionne@apple.com> Date: Wed Jul 29 14:24:02 2020 -0400 [libc++] Re-enable tests for C11 math macros in <float.h> and <cfloat> Fixes http://llvm.org/PR38572.