https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64467
--- Comment #9 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
To wit, at r220506 still see:
assertion "!t.isctype('\n', t.lookup_classname(blank,
blank+sizeof(blank)/sizeof(blank[0])-1))" failed: file
"/tmp/hpautotest-gcc1/gcc/libstdc++-v3/testsuite/28_regex/traits/char/isctype.cc",
line 61, function: void test01()
program stopped with signal 6 (Aborted).
Maybe the newlib preprocessor symbol isn't universal?
