[Bug libfortran/63471] [5.0 Regression] unix.c:1906:10: error: implicit declaration of function 'ttyname_r'

[jb at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63471

--- Comment #5 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Ah, I suspected that other functions might be affected as well. Thanks for
finding them.

That being said, googling this issue I stumbled upon
https://gcc.gnu.org/ml/gcc-patches/2011-03/msg00545.html where you fixed a
similar issue for hp-ux 10, seemingly by making the driver always set
_REENTRANT. Wouldn't a similar thing be the right thing to do for hp-ux 11 as
well? If there are no ill effects of always enabling _REENTRANT that would help
other software than just libgfortran, as well as eliminating the risk that
unconditionally enabling _REENTRANT in libgfortran might break on some other
target?