Charles Diza wrote:
I'm really wondering whether a grep 3.1 that fails this test is safe to keep using.
It's safe. This is an incompatibility that Apple deliberately introduced into macOS to try to make programs "safer". The incompatibility breaks the test programs in question but does not break grep or diffutils proper (nor does it make them any "safer"). We'll work around the incompatiblity in future versions. See the thread starting here:
https://lists.gnu.org/r/bug-gnulib/2017-07/msg00056.html
