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114 lines
2.9 KiB
Plaintext
114 lines
2.9 KiB
Plaintext
# errno_h.m4 serial 4
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dnl Copyright (C) 2004, 2006, 2008, 2009 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This macro must pass through AC_REQUIRE (never directly invoke it).
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AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
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AC_EGREP_CPP([booboo],[
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#include <errno.h>
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#if !defined ENOMSG
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booboo
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#endif
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#if !defined EIDRM
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booboo
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#endif
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#if !defined ENOLINK
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booboo
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#endif
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#if !defined EPROTO
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booboo
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#endif
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#if !defined EMULTIHOP
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booboo
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#endif
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#if !defined EBADMSG
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booboo
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#endif
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#if !defined EOVERFLOW
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booboo
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#endif
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#if !defined ENOTSUP
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booboo
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#endif
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#if !defined ECANCELED
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booboo
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#endif
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],
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[gl_cv_header_errno_h_complete=no],
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[gl_cv_header_errno_h_complete=yes])
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])
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if test $gl_cv_header_errno_h_complete = yes; then
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ERRNO_H=''
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else
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gl_CHECK_NEXT_HEADERS([errno.h])
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ERRNO_H='errno.h'
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fi
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AC_SUBST([ERRNO_H])
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gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
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gl_REPLACE_ERRNO_VALUE([ENOLINK])
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gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
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])
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# Assuming $1 = EOVERFLOW.
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# The EOVERFLOW errno value ought to be defined in <errno.h>, according to
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# POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
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# some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
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# Check for the value of EOVERFLOW.
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# Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
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AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
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[
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if test -n "$ERRNO_H"; then
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AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
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AC_EGREP_CPP([yes],[
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#include <errno.h>
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#ifdef ]$1[
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yes
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#endif
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],
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[gl_cv_header_errno_h_]$1[=yes],
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[gl_cv_header_errno_h_]$1[=no])
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if test $gl_cv_header_errno_h_]$1[ = no; then
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AC_EGREP_CPP([yes],[
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#define _XOPEN_SOURCE_EXTENDED 1
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#include <errno.h>
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#ifdef ]$1[
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yes
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#endif
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], [gl_cv_header_errno_h_]$1[=hidden])
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if test $gl_cv_header_errno_h_]$1[ = hidden; then
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dnl The macro exists but is hidden.
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dnl Define it to the same value.
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AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
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#define _XOPEN_SOURCE_EXTENDED 1
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#include <errno.h>
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/* The following two lines are a workaround against an autoconf-2.52 bug. */
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#include <stdio.h>
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#include <stdlib.h>
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])
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fi
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fi
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])
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case $gl_cv_header_errno_h_]$1[ in
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yes | no)
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]$1[_HIDDEN=0; ]$1[_VALUE=
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;;
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*)
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]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
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;;
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esac
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AC_SUBST($1[_HIDDEN])
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AC_SUBST($1[_VALUE])
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fi
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])
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dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
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dnl Remove this when we can assume autoconf >= 2.61.
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m4_ifdef([AC_COMPUTE_INT], [], [
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AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
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])
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