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Date: Fri, 05 Jun 2015 11:56:57 +0300
From: "Eli Zaretskii (eliz AT gnu DOT org)" <djgpp AT delorie DOT com>
Subject: Re: DJGPP v2.05: some thoughts
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FWIW, as far as I could glean from drafts of C++ standards available
on the net, the C++ standards define the following errno values:

C++98 and C++03 still required only EDOM and ERANGE, perhaps with
EILSEQ (I cannot say, some drafts have EILSEQ, some don't).

C++11 stated Posix compliance, and therefore added all of the values
defined by Posix:

  ECONNREFUSED EIO ENODEV ENOTEMPTY ERANGE
  E2BIG ECONNRESET EISCONN ENOENT ENOTRECOVERABLE EROFS
  EACCES EDEADLK EISDIR ENOEXEC ENOTSOCK ESPIPE
  EADDRINUSE EDESTADDRREQ ELOOP ENOLCK ENOTSUP ESRCH
  EADDRNOTAVAIL EDOM EMFILE ENOLINK ENOTTY ETIME
  EAFNOSUPPORT EEXIST EMLINK ENOMEM ENXIO ETIMEDOUT
  EAGAIN EFAULT EMSGSIZE ENOMSG EOPNOTSUPP ETXTBSY
  EALREADY EFBIG ENAMETOOLONG ENOPROTOOPT EOVERFLOW EWOULDBLOCK
  EBADF EHOSTUNREACH ENETDOWN ENOSPC EOWNERDEAD EXDEV
  EBADMSG EIDRM ENETRESET ENOSR EPERM
  EBUSY EILSEQ ENETUNREACH ENOSTR EPIPE
  ECANCELED EINPROGRESS ENFILE ENOSYS EPROTO
  ECHILD EINTR ENOBUFS ENOTCONN EPROTONOSUPPORT
  ECONNABORTED EINVAL ENODATA ENOTDIR EPROTOTYPE

This list stays unchanged through all the following C++ standards,
including C++14.

The latest C standard, C11, still defines only 3 errno values: EDOM,
EILSEQ, and ERANGE.

So therefore I think we should have only those 3 values in the
__STRICT_ANSI__ portion, unless __cplusplus is defined and its value
is greater or equal to 201103L (which is what AFAICS GCC defines when
invoked as "g++ -std=c++11"), in which case we should have all of the
above Posix values available.