2 dnl Copyright (C) 2004, 2006, 2008-2020 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
9 AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
11 AC_REQUIRE([AC_PROG_CC])
12 AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
13 AC_EGREP_CPP([booboo],[
30 #if !defined EMULTIHOP
36 #if !defined EOVERFLOW
42 #if !defined ENETRESET
45 #if !defined ECONNABORTED
54 #if !defined ECANCELED
57 #if !defined EOWNERDEAD
60 #if !defined ENOTRECOVERABLE
67 [gl_cv_header_errno_h_complete=no],
68 [gl_cv_header_errno_h_complete=yes])
70 if test $gl_cv_header_errno_h_complete = yes; then
73 gl_NEXT_HEADERS([errno.h])
77 AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])
78 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
79 gl_REPLACE_ERRNO_VALUE([ENOLINK])
80 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
83 # Assuming $1 = EOVERFLOW.
84 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
85 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
86 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
87 # Check for the value of EOVERFLOW.
88 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
89 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
91 if test -n "$ERRNO_H"; then
92 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
99 [gl_cv_header_errno_h_]$1[=yes],
100 [gl_cv_header_errno_h_]$1[=no])
101 if test $gl_cv_header_errno_h_]$1[ = no; then
103 #define _XOPEN_SOURCE_EXTENDED 1
108 ], [gl_cv_header_errno_h_]$1[=hidden])
109 if test $gl_cv_header_errno_h_]$1[ = hidden; then
110 dnl The macro exists but is hidden.
111 dnl Define it to the same value.
112 AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
113 #define _XOPEN_SOURCE_EXTENDED 1
115 /* The following two lines are a workaround against an autoconf-2.52 bug. */
122 case $gl_cv_header_errno_h_]$1[ in
124 ]$1[_HIDDEN=0; ]$1[_VALUE=
127 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
130 AC_SUBST($1[_HIDDEN])