# errno_h.m4 serial 13

dnl Copyright (C) 2004, 2006, 2008-2020 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

AC_PREREQ([2.61])

AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],

[

  AC_REQUIRE([AC_PROG_CC])

  AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [

    AC_EGREP_CPP([booboo],[

#include <errno.h>

#if !defined ETXTBSY

booboo

#endif

#if !defined ENOMSG

booboo

#endif

#if !defined EIDRM

booboo

#endif

#if !defined ENOLINK

booboo

#endif

#if !defined EPROTO

booboo

#endif

#if !defined EMULTIHOP

booboo

#endif

#if !defined EBADMSG

booboo

#endif

#if !defined EOVERFLOW

booboo

#endif

#if !defined ENOTSUP

booboo

#endif

#if !defined ENETRESET

booboo

#endif

#if !defined ECONNABORTED

booboo

#endif

#if !defined ESTALE

booboo

#endif

#if !defined EDQUOT

booboo

#endif

#if !defined ECANCELED

booboo

#endif

#if !defined EOWNERDEAD

booboo

#endif

#if !defined ENOTRECOVERABLE

booboo

#endif

#if !defined EILSEQ

booboo

#endif

      ],

      [gl_cv_header_errno_h_complete=no],

      [gl_cv_header_errno_h_complete=yes])

  ])

  if test $gl_cv_header_errno_h_complete = yes; then

    ERRNO_H=''

  else

    gl_NEXT_HEADERS([errno.h])

    ERRNO_H='errno.h'

  fi

  AC_SUBST([ERRNO_H])

  AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])

  gl_REPLACE_ERRNO_VALUE([EMULTIHOP])

  gl_REPLACE_ERRNO_VALUE([ENOLINK])

  gl_REPLACE_ERRNO_VALUE([EOVERFLOW])

])

# Assuming $1 = EOVERFLOW.

# The EOVERFLOW errno value ought to be defined in <errno.h>, according to

# POSIX.  But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and

# some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.

# Check for the value of EOVERFLOW.

# Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.

AC_DEFUN([gl_REPLACE_ERRNO_VALUE],

[

  if test -n "$ERRNO_H"; then

    AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [

      AC_EGREP_CPP([yes],[

#include <errno.h>

#ifdef ]$1[

yes

#endif

      ],

      [gl_cv_header_errno_h_]$1[=yes],

      [gl_cv_header_errno_h_]$1[=no])

      if test $gl_cv_header_errno_h_]$1[ = no; then

        AC_EGREP_CPP([yes],[

#define _XOPEN_SOURCE_EXTENDED 1

#include <errno.h>

#ifdef ]$1[

yes

#endif

          ], [gl_cv_header_errno_h_]$1[=hidden])

        if test $gl_cv_header_errno_h_]$1[ = hidden; then

          dnl The macro exists but is hidden.

          dnl Define it to the same value.

          AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [

#define _XOPEN_SOURCE_EXTENDED 1

#include <errno.h>

/* The following two lines are a workaround against an autoconf-2.52 bug.  */

#include <stdio.h>

#include <stdlib.h>

])

        fi

      fi

    ])

    case $gl_cv_header_errno_h_]$1[ in

      yes | no)

        ]$1[_HIDDEN=0; ]$1[_VALUE=

        ;;

      *)

        ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["

        ;;

    esac

    AC_SUBST($1[_HIDDEN])

    AC_SUBST($1[_VALUE])

  fi

])