3 dnl Copyright (C) 2004, 2006, 2008-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
10 AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
12 AC_REQUIRE([AC_PROG_CC])
14 dnl Through the dependency on module extensions-aix, _LINUX_SOURCE_COMPAT
15 dnl gets defined already before this macro gets invoked. This persuades
16 dnl AIX 7.3 errno.h to assign ENOTEMPTY a value different than EEXIST.
18 AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
19 AC_EGREP_CPP([booboo],[
36 #if !defined EMULTIHOP
42 #if !defined EOVERFLOW
48 #if !defined ENETRESET
51 #if !defined ECONNABORTED
60 #if !defined ECANCELED
63 #if !defined EOWNERDEAD
66 #if !defined ENOTRECOVERABLE
72 #if !defined ESOCKTNOSUPPORT
76 [gl_cv_header_errno_h_complete=no],
77 [gl_cv_header_errno_h_complete=yes])
79 if test $gl_cv_header_errno_h_complete = yes; then
80 GL_GENERATE_ERRNO_H=false
82 gl_NEXT_HEADERS([errno.h])
83 GL_GENERATE_ERRNO_H=true
85 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
86 gl_REPLACE_ERRNO_VALUE([ENOLINK])
87 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
90 # Assuming $1 = EOVERFLOW.
91 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
92 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
93 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
94 # Check for the value of EOVERFLOW.
95 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
96 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
98 if $GL_GENERATE_ERRNO_H; then
99 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
106 [gl_cv_header_errno_h_]$1[=yes],
107 [gl_cv_header_errno_h_]$1[=no])
108 if test $gl_cv_header_errno_h_]$1[ = no; then
110 #define _XOPEN_SOURCE_EXTENDED 1
115 ], [gl_cv_header_errno_h_]$1[=hidden])
116 if test $gl_cv_header_errno_h_]$1[ = hidden; then
117 dnl The macro exists but is hidden.
118 dnl Define it to the same value.
119 AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
120 #define _XOPEN_SOURCE_EXTENDED 1
122 /* The following two lines are a workaround against an autoconf-2.52 bug. */
129 case $gl_cv_header_errno_h_]$1[ in
131 ]$1[_HIDDEN=0; ]$1[_VALUE=
134 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
137 AC_SUBST($1[_HIDDEN])