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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/104883] <system_error> should define all std::errc
 enumerators
Date: Thu, 22 Sep 2022 10:47:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104883

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
>From PR 1007008 comment 2:

-- >8 --
We could do something like this for each enumerator:

#ifdef EFOO
   foo =3D EFOO,
#else
   foo =3D _GLIBCXX_ERRC_ORIGIN + __LINE__,
#endif


Where _GLIBCXX_ERRC_ORIGIN is some value intended to be higher than the hig=
hest
errno value on the OS. We only need fewer than 100 errc enumerators so
INT_MAX/2 might be OK.

We can use #line to set the __LINE__ to a fixed value in the file, so that =
the
constants don't change if we add/remove lines before the errc definition.
-- >8 --

We can use a default _GLIBCXX_ERRC_ORIGIN value, and allow it to be overrid=
den
in config/os/*/os_defines.h if the default doesn't work.=