[Bug libstdc++/127424] 27_io testsuite: opening a FIFO with O_RDWR is undefined in POSIX; 9964.cc also stopped testing PR 9964 in 2004

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127424

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk. Do you care whether this is backported to release branches?