m4sh.m4

autoconf 2.59版,可用于redhat系统.用于编译原码,编写makefile文件.

# This file is part of Autoconf.                          -*- Autoconf -*-
# M4 sugar for common shell constructs.
# Requires GNU M4 and M4sugar.
# Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# are the output of Autoconf.  You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of Autoconf appear in them.  The GNU
# General Public License (GPL) does govern all other use of the material
# that constitutes the Autoconf program.
#
# Certain portions of the Autoconf source text are designed to be copied
# (in certain cases, depending on the input) into the output of
# Autoconf.  We call these the "data" portions.  The rest of the Autoconf
# source text consists of comments plus executable code that decides which
# of the data portions to output in any given case.  We call these
# comments and executable code the "non-data" portions.  Autoconf never
# copies any of the non-data portions into its output.
#
# This special exception to the GPL applies to versions of Autoconf
# released by the Free Software Foundation.  When you make and
# distribute a modified version of Autoconf, you may extend this special
# exception to the GPL to apply to your modified version as well, *unless*
# your modified version has the potential to copy into its output some
# of the text that was the non-data portion of the version that you started
# with.  (In other words, unless your change moves or copies text from
# the non-data portions to the data portions.)  If your modification has
# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.
#
# Written by Akim Demaille, Pavel Roskin, Alexandre Oliva, Lars J. Aas
# and many other people.


# We heavily use m4's diversions both for the initializations and for
# required macros, because in both cases we have to issue soon in
# output something which is discovered late.
#
#
# KILL is only used to suppress output.
#
# - BINSH
#   AC_REQUIRE'd #! /bin/sh line
# - HEADER-REVISION
#   RCS keywords etc.
# - HEADER-COMMENT
#   Purpose of the script etc.
# - HEADER-COPYRIGHT
#   Copyright notice(s)
# - M4SH-INIT
#   M4sh's initializations
#
# - BODY
#   The body of the script.


# _m4_divert(DIVERSION-NAME)
# --------------------------
# Convert a diversion name into its number.  Otherwise, return
# DIVERSION-NAME which is supposed to be an actual diversion number.
# Of course it would be nicer to use m4_case here, instead of zillions
# of little macros, but it then takes twice longer to run `autoconf'!
m4_define([_m4_divert(BINSH)],             0)
m4_define([_m4_divert(HEADER-REVISION)],   1)
m4_define([_m4_divert(HEADER-COMMENT)],    2)
m4_define([_m4_divert(HEADER-COPYRIGHT)],  3)
m4_define([_m4_divert(M4SH-INIT)],         4)
m4_define([_m4_divert(BODY)],           1000)

# Aaarg.  Yet it starts with compatibility issues...  Libtool wants to
# use NOTICE to insert its own LIBTOOL-INIT stuff.  People should ask
# before diving into our internals :(
m4_copy([_m4_divert(M4SH-INIT)], [_m4_divert(NOTICE)])



## ------------------------- ##
## 1. Sanitizing the shell.  ##
## ------------------------- ##


# AS_REQUIRE(NAME-TO-CHECK, [BODY-TO-EXPAND = NAME-TO-CHECK])
# -----------------------------------------------------------
# BODY-TO-EXPAND is some initialization which must be expanded in the
# M4SH-INIT section when expanded (required or not).  This is very
# different from m4_require.  For instance:
#
#      m4_defun([_FOO_PREPARE], [foo=foo])
#      m4_defun([FOO],
#      [m4_require([_FOO_PREPARE])dnl
#      echo $foo])
#
#      m4_defun([_BAR_PREPARE], [bar=bar])
#      m4_defun([BAR],
#      [AS_REQUIRE([_BAR_PREPARE])dnl
#      echo $bar])
#
#      AS_INIT
#      foo1=`FOO`
#      foo2=`FOO`
#      bar1=`BAR`
#      bar2=`BAR`
#
# gives
#
#      #! /bin/sh
#      bar=bar
#
#      foo1=`foo=foo
#      echo $foo`
#      foo2=`echo $foo`
#      bar1=`echo $bar`
#      bar2=`echo $bar`
#
m4_define([AS_REQUIRE],
[m4_provide_if([$1], [],
	       [m4_divert_text([M4SH-INIT], [m4_default([$2], [$1])])])])


# AS_SHELL_SANITIZE
# -----------------
# Try to be as Bourne and/or POSIX as possible.
m4_defun([AS_SHELL_SANITIZE],
[## --------------------- ##
## M4sh Initialization.  ##
## --------------------- ##

# Be Bourne compatible
if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
  emulate sh
  NULLCMD=:
  [#] Zsh 3.x and 4.x performs word splitting on ${1+"$[@]"}, which
  # is contrary to our usage.  Disable this feature.
  alias -g '${1+"$[@]"}'='"$[@]"'
elif test -n "${BASH_VERSION+set}" && (set -o posix) >/dev/null 2>&1; then
  set -o posix
fi
DUALCASE=1; export DUALCASE # for MKS sh

_AS_UNSET_PREPARE

# Work around bugs in pre-3.0 UWIN ksh.
$as_unset ENV MAIL MAILPATH
PS1='$ '
PS2='> '
PS4='+ '

# NLS nuisances.
for as_var in \
  LANG LANGUAGE LC_ADDRESS LC_ALL LC_COLLATE LC_CTYPE LC_IDENTIFICATION \
  LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER \
  LC_TELEPHONE LC_TIME
do
  if (set +x; test -z "`(eval $as_var=C; export $as_var) 2>&1`"); then
    eval $as_var=C; export $as_var
  else
    $as_unset $as_var
  fi
done

# Required to use basename.
_AS_EXPR_PREPARE
_AS_BASENAME_PREPARE

# Name of the executable.
as_me=`AS_BASENAME("$[0]")`

])


# _AS_PREPARE
# -----------
# This macro has a very special status.  Normal use of M4sh relies
# heavily on AS_REQUIRE, so that needed initializations (such as
# _AS_TEST_PREPARE) are performed on need, not on demand.  But
# Autoconf is the first client of M4sh, and for two reasons: configure
# and config.status.  Relying on AS_REQUIRE is of course fine for
# configure, but fails for config.status (which is created by
# configure).  So we need a means to force the inclusion of the
# various _AS_PREPARE_* on top of config.status.  That's basically why
# there are so many _AS_PREPARE_* below, and that's also why it is
# important not to forget some: config.status needs them.
m4_defun([_AS_PREPARE],
[# PATH needs CR, and LINENO needs CR and PATH.
_AS_CR_PREPARE
_AS_PATH_SEPARATOR_PREPARE
_AS_LINENO_PREPARE

_AS_ECHO_N_PREPARE
_AS_EXPR_PREPARE
_AS_LN_S_PREPARE
_AS_MKDIR_P_PREPARE
_AS_TEST_PREPARE
_AS_TR_CPP_PREPARE
_AS_TR_SH_PREPARE

# IFS
# We need space, tab and new line, in precisely that order.
as_nl='
'
IFS=" 	$as_nl"

# CDPATH.
$as_unset CDPATH
])


# AS_PREPARE
# ----------
# Output all the M4sh possible initialization into the initialization
# diversion.
m4_defun([AS_PREPARE],
[m4_divert_text([M4SH-INIT], [_AS_PREPARE])])


## ----------------------------- ##
## 2. Wrappers around builtins.  ##
## ----------------------------- ##

# This section is lexicographically sorted.


# AS_EXIT([EXIT-CODE = 1])
# ------------------------
# Exit and set exit code to EXIT-CODE in the way that it's seen
# within "trap 0".
#
# We cannot simply use "exit N" because some shells (zsh and Solaris sh)
# will not set $? to N while running the code set by "trap 0"
# So we set $? by executing "exit N" in the subshell and then exit.
# Other shells don't use `$?' as default for `exit', hence just repeating
# the exit value can only help improving portability.
m4_define([AS_EXIT],
[{ (exit m4_default([$1], 1)); exit m4_default([$1], 1); }])


# AS_IF(TEST, [IF-TRUE], [IF-FALSE])
# ----------------------------------
# Expand into
# | if TEST; then
# |   IF-TRUE
# | else
# |   IF-FALSE
# | fi
# with simplifications is IF-TRUE and/or IF-FALSE is empty.
#
# FIXME: Be n-ary, just as m4_if.
m4_define([AS_IF],
[m4_ifval([$2$3],
[if $1; then
  m4_ifval([$2], [$2], :)
m4_ifvaln([$3],
[else
  $3])dnl
fi
])dnl
])# AS_IF


# _AS_UNSET_PREPARE
# -----------------
# AS_UNSET depends upon $as_unset: compute it.
# Use MAIL to trigger a bug in Bash 2.01;
# the "|| exit" suppresses the resulting "Segmentation fault" message.
# Avoid 'if ((', as that triggers a bug in pdksh 5.2.14.
m4_defun([_AS_UNSET_PREPARE],
[# Support unset when possible.
if ( (MAIL=60; unset MAIL) || exit) >/dev/null 2>&1; then
  as_unset=unset
else
  as_unset=false
fi
])


# AS_UNSET(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `'])
# --------------------------------------------------
# Try to unset the env VAR, otherwise set it to
# VALUE-IF-UNSET-NOT-SUPPORTED.  `as_unset' must have been computed.
m4_defun([AS_UNSET],
[AS_REQUIRE([_AS_UNSET_PREPARE])dnl
$as_unset $1 || test "${$1+set}" != set || { $1=$2; export $1; }])






## ------------------------------------------ ##
## 3. Error and warnings at the shell level.  ##
## ------------------------------------------ ##

# If AS_MESSAGE_LOG_FD is defined, shell messages are duplicated there
# too.


# AS_ESCAPE(STRING, [CHARS = $"'\])
# ---------------------------------
# Escape the CHARS in STRING.
m4_define([AS_ESCAPE],
[m4_bpatsubst([$1],
	     m4_ifval([$2], [[\([$2]\)]], [[\([\"$`]\)]]),
	     [\\\1])])


# _AS_QUOTE_IFELSE(STRING, IF-MODERN-QUOTATION, IF-OLD-QUOTATION)
# ---------------------------------------------------------------
# Compatibility glue between the old AS_MSG suite which did not
# quote anything, and the modern suite which quotes the quotes.
# If STRING contains `\\' or `\$', it's modern.
# If STRING contains `\"' or `\`', it's old.
# Otherwise it's modern.
# We use two quotes in the pattern to keep highlighting tools at peace.
m4_define([_AS_QUOTE_IFELSE],
[m4_bmatch([$1],
	  [\\[\\$]], [$2],
	  [\\[`""]], [$3],
	  [$2])])


# _AS_ECHO_UNQUOTED(STRING, [FD = AS_MESSAGE_FD])
# -----------------------------------------------
# Perform shell expansions on STRING and echo the string to FD.
m4_define([_AS_ECHO_UNQUOTED],
[echo "$1" >&m4_default([$2], [AS_MESSAGE_FD])])


# _AS_QUOTE(STRING, [CHARS = `"])
# -------------------------------
# If there are quoted (via backslash) backquotes do nothing, else
# backslash all the quotes.
m4_define([_AS_QUOTE],
[_AS_QUOTE_IFELSE([$1],
		  [AS_ESCAPE([$1], m4_default([$2], [`""]))],
		  [m4_warn([obsolete],
	   [back quotes and double quotes must not be escaped in: $1])dnl
$1])])


# _AS_ECHO(STRING, [FD = AS_MESSAGE_FD])
# --------------------------------------
# Protect STRING from backquote expansion, echo the result to FD.
m4_define([_AS_ECHO],
[_AS_ECHO_UNQUOTED([_AS_QUOTE([$1])], [$2])])


# _AS_ECHO_N_PREPARE
# ------------------
# Check whether to use -n, \c, or newline-tab to separate
# checking messages from result messages.
# Don't try to cache, since the results of this macro are needed to
# display the checking message.  In addition, caching something used once
# has little interest.
# Idea borrowed from dist 3.0.  Use `*c*,', not `*c,' because if `\c'
# failed there is also a new-line to match.
m4_defun([_AS_ECHO_N_PREPARE],
[case `echo "testing\c"; echo 1,2,3`,`echo -n testing; echo 1,2,3` in
  *c*,-n*) ECHO_N= ECHO_C='
' ECHO_T='	' ;;