fail to build libcxx with llvm 8.0.0


I try to build llvm 8.0.0 (with clang compiler-rt libcxx libcxxabi lldb lld polly). But At libcxx build stage I got a wall of error: ‘std::abort’ has not been declared

This happen when the builder compile the file: libcxxabi/src/cxa_aux_runtime.cpp

I build using gcc 8.3.0 and I am able to build and run some toys code (see below)

The command used to compile is (they are some duplicated flag due to var env):