autoconf/m4sh.m4
2000-11-30 17:35:16 +00:00

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include(m4sugar.m4)# -*- Autoconf -*-
# This file is part of Autoconf.
# M4 sugar for common shell constructs.
# Requires GNU M4 and M4sugar.
# Copyright 2000 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.
## ------------------------- ##
## 1. Sanitizing the shell. ##
## ------------------------- ##
# AS_SHELL_SANITIZE
# -----------------
# Try to be as Bourne and/or POSIX as possible.
m4_defun([AS_SHELL_SANITIZE],
[# Be Bourne compatible
if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
emulate sh
NULLCMD=:
elif test -n "${BASH_VERSION+set}" && (set -o posix) >/dev/null 2>&1; then
set -o posix
fi
_AS_EXPR_PREPARE
_AS_UNSET_PREPARE
# NLS nuisances.
AS_UNSET([LANG], [C])
AS_UNSET([LC_ALL], [C])
AS_UNSET([LC_TIME], [C])
AS_UNSET([LC_CTYPE], [C])
AS_UNSET([LANGUAGE], [C])
AS_UNSET([LC_COLLATE], [C])
AS_UNSET([LC_NUMERIC], [C])
AS_UNSET([LC_MESSAGES], [C])
# IFS
# We need space, tab and new line, in precisely that order.
ac_nl='
'
IFS=" $ac_nl"
# CDPATH.
AS_UNSET([CDPATH], [:])
])
## ----------------------------- ##
## 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.
m4_define([AS_EXIT],
[{ (exit m4_default([$1], 1)); exit; }])
# AS_IFELSE(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.
m4_define([AS_IFELSE],
[m4_ifval([$2$3],
[if $1; then
m4_ifval([$2], [$2], :)
m4_ifvaln([$3],
[else
$3])dnl
fi
])dnl
])# AS_IFELSE
# _AS_UNSET_PREPARE
# -----------------
# AS_UNSET depends upon $as_unset: compute it.
m4_defun([_AS_UNSET_PREPARE],
[# Support unset when possible.
if (FOO=FOO; unset FOO) >/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. `ac_unset' must have been computed.
m4_defun([AS_UNSET],
[m4_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_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],
[ifelse(m4_regexp([$1], [\\[\\$]]),
[-1], [ifelse(m4_regexp([$1], [\\[`""]]),
[-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)
# -----------------
# If there are quoted (via backslash) backquotes do nothing, else
# backslash all the quotes.
# FIXME: In a distant future (2.51 or +), this warning should be
# classified as `syntax'. It is classified as `obsolete' to ease
# the transition (for Libtool for instance).
m4_define([_AS_QUOTE],
[_AS_QUOTE_IFELSE([$1],
[m4_patsubst([$1], [\([`""]\)], [\\\1])],
[m4_warn([obsolete],
[back quotes and double quotes should not be escaped in: $1])dnl
$1])])
# _AS_ECHO(STRING, [FD = AS_FD_MSG])
# ----------------------------------
# Protect STRING from backquote expansion, echo the result to FD.
m4_define([_AS_ECHO],
[_AS_ECHO_UNQUOTED([_AS_QUOTE([$1])], $2)])
# AS_MESSAGE(STRING, [FD = AS_MESSAGE_FD])
# --------------------------------------------
m4_define([AS_MESSAGE],
[m4_ifset([AS_MESSAGE_LOG_FD],
[{ _AS_ECHO([$as_me:__oline__: $1], [AS_MESSAGE_LOG_FD])
_AS_ECHO($@);}],
[_AS_ECHO($@)])[]dnl
])
# AS_WARN(PROBLEM)
# ----------------
m4_define([AS_WARN],
[m4_ifset([AS_MESSAGE_LOG_FD],
[{ _AS_ECHO([$as_me:__oline__: WARNING: $1], [AS_MESSAGE_LOG_FD])
_AS_ECHO([$as_me: warning: $1], 2); }],
[_AS_ECHO([$as_me: warning: $1], 2)])[]dnl
])# AS_WARN
# AS_ERROR(ERROR, [EXIT-STATUS = 1])
# ----------------------------------
m4_define([AS_ERROR],
[{m4_ifset([AC_LOG_FD],
[_AS_ECHO([$as_me:__oline__: error: $1], [AS_MESSAGE_LOG_FD])
])[]dnl
_AS_ECHO([$as_me: error: $1], 2)
AS_EXIT([$2]); }[]dnl
])# AS_ERROR
## -------------------------------------- ##
## 4. Portable versions of common tools. ##
## -------------------------------------- ##
# This section is lexicographically sorted.
# AS_DIRNAME(PATHNAME)
# --------------------
# Simulate running `dirname(1)' on PATHNAME, not all systems have it.
# This macro must be usable from inside ` `.
#
# Prefer expr to echo|sed, since expr is usually faster and it handles
# backslashes and newlines correctly. However, older expr
# implementations (e.g. SunOS 4 expr and Solaris 8 /usr/ucb/expr) have
# a silly length limit that causes expr to fail if the matched
# substring is longer than 120 bytes. So fall back on echo|sed if
# expr fails.
#
# FIXME: Please note the following m4_require is quite wrong: if the first
# occurrence of AS_DIRNAME_EXPR is in a backquoted expression, the
# shell will be lost. We might have to introduce diversions for
# setting up an M4sh script: required macros will then be expanded there.
m4_defun([AS_DIRNAME_EXPR],
[m4_require([_AS_EXPR_PREPARE])dnl
$as_expr X[]$1 : 'X\(.*[[^/]]\)//*[[^/][^/]]*/*$' \| \
X[]$1 : 'X\(//\)[[^/]]' \| \
X[]$1 : 'X\(//\)$' \| \
X[]$1 : 'X\(/\)' \| \
. : '\(.\)'])
m4_defun([AS_DIRNAME_SED],
[echo X[]$1 |
sed ['/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/; q; }
/^X\(\/\/\)[^/].*/{ s//\1/; q; }
/^X\(\/\/\)$/{ s//\1/; q; }
/^X\(\/\).*/{ s//\1/; q; }
s/.*/./; q']])
m4_defun([AS_DIRNAME],
[AS_DIRNAME_EXPR([$1]) 2>/dev/null ||
AS_DIRNAME_SED([$1])])
# _AS_EXPR_PREPARE
# ----------------
# Some expr work properly (i.e. compute and issue the right result),
# but exit with failure. When a fall back to expr (as in AS_DIRNAME)
# is provided, you get twice the result. Prevent this.
m4_defun([_AS_EXPR_PREPARE],
[if expr a : '\(a\)' >/dev/null 2>&1; then
as_expr=expr
else
as_expr=false
fi[]dnl
])# _AS_EXPR_PREPARE
# AS_MKDIR_P(PATH)
# ----------------
# Emulate `mkdir -p' with plain `mkdir'.
m4_define([AS_MKDIR_P],
[{ case $1 in
[[\\/]]* | ?:[[\\/]]* ) ac_incr_dir=;;
*) ac_incr_dir=.;;
esac
ac_dummy=$1
for ac_mkdir_dir in `IFS=/; set X $ac_dummy; shift; echo "$[@]"`; do
ac_incr_dir=$ac_incr_dir/$ac_mkdir_dir
test -d $ac_incr_dir || mkdir $ac_incr_dir
done; }
])# AS_MKDIR_P
## ------------------ ##
## 5. Common idioms. ##
## ------------------ ##
# This section is lexicographically sorted.
# AS_TMPDIR(PREFIX)
# -----------------
# Create as safely as possible a temporary directory which name is
# inspired by PREFIX (should be 2-4 chars max), and set trap
# mechanisms to remove it.
m4_define([AS_TMPDIR],
[# Create a temporary directory, and hook for its removal unless debugging.
$debug ||
{
trap 'exit_status=$?; rm -rf $tmp && exit $exit_status' 0
trap 'AS_EXIT([$?])' 1 2 13 15
}
# Create a (secure) tmp directory for tmp files.
: ${TMPDIR=/tmp}
{
tmp=`(umask 077 && mktemp -d -q "$TMPDIR/$1XXXXXX") 2>/dev/null` &&
test -n "$tmp" && test -d "$tmp"
} ||
{
tmp=$TMPDIR/$1$$-$RANDOM
(umask 077 && mkdir $tmp)
} ||
{
echo "$me: cannot create a temporary directory in $TMPDIR" >&2
AS_EXIT
}dnl
])# AS_TMPDIR