[Bug libffi/65726] [5/6 Regression] libffi fails to build when not bootstrapping: configure: error: C++ preprocessor "/lib/cpp" fails sanity check

[gerald at pfeifer dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65726

--- Comment #6 from Gerald Pfeifer <gerald at pfeifer dot com> ---
I still can reproduce the failure by configuring with --disable-bootstrap
and then "make" or "make all".