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| -rw-r--r-- | m4sh.m4 | 731 |
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@@ -0,0 +1,731 @@ +include(m4sugar.m4)# -*- Autoconf -*- +# This file is part of Autoconf. +# M4 sugar for common shell constructs. +# Requires GNU M4 and M4sugar. +#------------------------------------------------------------------------------ +# Copyright 2020-2021,2022 Thomas E. Dickey +# Copyright 2000, 2001 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 + +# Name of the executable. +dnl Moved here because the tests below can use AC_MSG_ERROR, which uses $as_me +as_me=`AS_BASENAME($[0])` + +_AS_EXPR_PREPARE +_AS_LN_S_PREPARE +_AS_TEST_PREPARE +_AS_UNSET_PREPARE +_AS_TR_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. +as_nl=' +' +IFS=" $as_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 $? by executing "exit N" in the subshell and then exit. +# Other shells don't use `$?' 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. +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 $as_unset: compute it. +m4_defun([_AS_UNSET_PREPARE], +[# Support unset when possible. +if (FOO=FOO; unset FOO) >/dev/null 2>&1; then + as_unset="unset" +else + as_unset="false" +fi +]) + + +# AS_UNSET(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `']) +# -------------------------------------------------- +# Try to unset the env VAR, otherwise set it to +# VALUE-IF-UNSET-NOT-SUPPORTED. `as_unset' must have been computed. +m4_defun([AS_UNSET], +[m4_require([_AS_UNSET_PREPARE])dnl +$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_ESCAPE(STRING, [CHARS = $"'\]) +# --------------------------------- +# Escape the CHARS in STRING. +m4_define([AS_ESCAPE], +[m4_patsubst([$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_if(m4_regexp([$1], [\\[\\$]]), + [-1], [m4_if(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], + [AS_ESCAPE([$1], [`""])], + [m4_warn([obsolete], + [back quotes and double quotes should 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])], [$2])]) + + +# AS_MESSAGE(STRING, [FD = AS_MESSAGE_FD]) +# ---------------------------------------- +m4_define([AS_MESSAGE], +[m4_ifset([AS_MESSAGE_LOG_FD], + [{ _AS_ECHO([$as_me:__oline__: $1], [AS_MESSAGE_LOG_FD]) +_AS_ECHO([$as_me: $1], [$2]);}], + [_AS_ECHO([$as_me: $1], [$2])])[]dnl +]) + + +# AS_WARN(PROBLEM) +# ---------------- +m4_define([AS_WARN], +[AS_MESSAGE([WARNING: $1], [2])])# AS_WARN + + +# AS_ERROR(ERROR, [EXIT-STATUS = 1]) +# ---------------------------------- +m4_define([AS_ERROR], +[{ AS_MESSAGE([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_BASENAME(PATHNAME) +# -------------------- +# Simulate running `basename(1)' on PATHNAME, not all systems have it. +# This macro must be usable from inside ` `. +m4_defun([AS_BASENAME], +[echo "$1" |sed 's,.*[[\\/]],,']) + +# AS_EXECUTABLE_P +# --------------- +# Check whether a file is executable. +m4_defun([AS_EXECUTABLE_P], +[m4_require([_AS_TEST_PREPARE])dnl +$as_executable_p $1[]dnl +])# AS_EXECUTABLE_P + + +# _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 +])# _AS_EXPR_PREPARE + + +# _AS_LN_S_PREPARE +# ---------------- +# Don't use conftest.sym to avoid filename issues on DJGPP, where this +# would yield conftest.sym.exe for DJGPP < 2.04. And don't use `conftest' +# as base name to avoid prohibiting concurrency (e.g., concurrent +# config.statuses). +m4_defun([_AS_LN_S_PREPARE], +[rm -f conf$$ conf$$.exe conf$$.file +echo >conf$$.file +if ln -s conf$$.file conf$$ 2>/dev/null; then + # We could just check for DJGPP; but this test a) works b) is more generic + # and c) will remain valid once DJGPP supports symlinks (DJGPP 2.04). + if test -f conf$$.exe; then + # Don't use ln at all; we don't have any links + as_ln_s='cp -p' + else + as_ln_s='ln -s' + fi +elif ln conf$$.file conf$$ 2>/dev/null; then + as_ln_s='ln' +else + as_ln_s='cp -p' +fi +rm -f conf$$ conf$$.exe conf$$.file +])# _AS_LN_S_PREPARE + + +# AS_LN_S(FILE, LINK) +# ------------------- +# FIXME: Should we add the glue code to handle properly relative symlinks +# simulated with `ln' or `cp'? +m4_defun([AS_LN_S], +[m4_require([_AS_LN_S_PREPARE])dnl +$as_ln_s $1 $2 +]) + + +# AS_MKDIR_P(PATH) +# ---------------- +# Emulate `mkdir -p' with plain `mkdir'. +# +# Don't set IFS to '\\/' (see the doc): you would end up with +# directories called foo\bar and foo?az and others depending upon the +# shell. +m4_define([AS_MKDIR_P], +[{ case $1 in + [[\\/]]* | ?:[[\\/]]* ) as_incr_dir=;; + *) as_incr_dir=.;; +esac +as_dummy=$1 +for as_mkdir_dir in `IFS='/\\'; set X $as_dummy; shift; echo "$[@]"`; do + case $as_mkdir_dir in + # Skip DOS drivespec + ?:) as_incr_dir=$as_mkdir_dir ;; + *) + as_incr_dir=$as_incr_dir/$as_mkdir_dir + test -d "$as_incr_dir" || mkdir "$as_incr_dir" + ;; + esac +done; } +])# AS_MKDIR_P + + +# _AS_BROKEN_TEST_PREPARE +# ----------------------- +# FIXME: This does not work and breaks way too many things. +# +# Find out ahead of time whether we want test -x (preferred) or test -f +# to check whether a file is executable. +m4_defun([_AS_BROKEN_TEST_PREPARE], +[# Find out how to test for executable files. Don't use a zero-byte file, +# as systems may use methods other than mode bits to determine executability. +cat >conf$$.file <<_ASEOF +@%:@! /bin/sh +exit 0 +_ASEOF +chmod +x conf$$.file +if test -x conf$$.file >/dev/null 2>&1; then + as_executable_p="test -x" +elif test -f conf$$.file >/dev/null 2>&1; then + as_executable_p="test -f" +else + AS_ERROR([cannot check whether a file is executable on this system]) +fi +rm -f conf$$.file +])# _AS_BROKEN_TEST_PREPARE + + +# _AS_TEST_PREPARE +# ---------------- +m4_defun([_AS_TEST_PREPARE], +[as_executable_p="test -f" +])# _AS_BROKEN_TEST_PREPARE + + + + + + +## ------------------ ## +## 5. Common idioms. ## +## ------------------ ## + +# This section is lexicographically sorted. + + +# AS_BOX(MESSAGE, [FRAME-CHARACTER = `=']) +# ---------------------------------------- +# Output MESSAGE, a single line text, framed with FRAME-CHARACTER (which +# must not be `/'). +m4_define([AS_BOX], +[AS_LITERAL_IF([$1], + [_AS_BOX_LITERAL($@)], + [_AS_BOX_INDIR($@)])]) + +# _AS_BOX_LITERAL(MESSAGE, [FRAME-CHARACTER = `=']) +# ------------------------------------------------- +m4_define([_AS_BOX_LITERAL], +[cat <<\_ASBOX +m4_patsubst([$1], [.], m4_if([$2], [], [[=]], [[$2]])) +$1 +m4_patsubst([$1], [.], m4_if([$2], [], [[=]], [[$2]])) +_ASBOX]) + +# _AS_BOX_INDIR(MESSAGE, [FRAME-CHARACTER = `=']) +# ----------------------------------------------- +m4_define([_AS_BOX_INDIR], +[sed 'h;s/./m4_default([$2], [=])/g;p;x;p;x' <<_ASBOX +$1 +_ASBOX]) + + +# AS_LITERAL_IF(EXPRESSION, IF-LITERAL, IF-NOT-LITERAL) +# ----------------------------------------------------- +# If EXPRESSION has shell indirections ($var or `expr`), expand +# IF-INDIR, else IF-NOT-INDIR. +# This is an *approximation*: for instance EXPRESSION = `\$' is +# definitely a literal, but will not be recognized as such. +m4_define([AS_LITERAL_IF], +[m4_if(m4_regexp([$1], [[`$]]), + -1, [$2], + [$3])]) + + +# 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])' 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 + + +# AS_UNAME +# -------- +# Try to describe this machine. Meant for logs. +m4_define([AS_UNAME], +[{ +cat <<_ASUNAME +## ---------- ## +## Platform. ## +## ---------- ## + +hostname = `(hostname || uname -n) 2>/dev/null | sed 1q` +uname -m = `(uname -m) 2>/dev/null || echo unknown` +uname -r = `(uname -r) 2>/dev/null || echo unknown` +uname -s = `(uname -s) 2>/dev/null || echo unknown` +uname -v = `(uname -v) 2>/dev/null || echo unknown` + +/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null || echo unknown` +/bin/uname -X = `(/bin/uname -X) 2>/dev/null || echo unknown` + +/bin/arch = `(/bin/arch) 2>/dev/null || echo unknown` +/usr/bin/arch -k = `(/usr/bin/arch -k) 2>/dev/null || echo unknown` +/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null || echo unknown` +hostinfo = `(hostinfo) 2>/dev/null || echo unknown` +/bin/machine = `(/bin/machine) 2>/dev/null || echo unknown` +/usr/bin/oslevel = `(/usr/bin/oslevel) 2>/dev/null || echo unknown` +/bin/universe = `(/bin/universe) 2>/dev/null || echo unknown` + +PATH = $PATH + +_ASUNAME +}]) + + + +## ------------------------------------ ## +## Common m4/sh character translation. ## +## ------------------------------------ ## + +# The point of this section is to provide high level macros comparable +# to m4's `translit' primitive, but m4/sh polymorphic. +# Transliteration of literal strings should be handled by m4, while +# shell variables' content will be translated at runtime (tr or sed). + + +# _AS_CR_PREPARE +# -------------- +# Output variables defining common character ranges. +# See m4_cr_letters etc. +m4_defun([_AS_CR_PREPARE], +[# Avoid depending upon Character Ranges. +as_cr_letters='abcdefghijklmnopqrstuvwxyz' +as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ' +as_cr_Letters=$as_cr_letters$as_cr_LETTERS +as_cr_digits='0123456789' +as_cr_alnum=$as_cr_Letters$as_cr_digits +]) + + +# _AS_TR_SH_PREPARE +# ----------------- +m4_defun([_AS_TR_SH_PREPARE], +[m4_require([_AS_CR_PREPARE])dnl +# Sed expression to map a string onto a valid variable name. +as_tr_sh="sed y%*+%pp%;s%[[^_$as_cr_alnum]]%_%g" +]) + + +# AS_TR_SH(EXPRESSION) +# -------------------- +# Transform EXPRESSION into a valid shell variable name. +# sh/m4 polymorphic. +# Be sure to update the definition of `$as_tr_sh' if you change this. +m4_defun([AS_TR_SH], +[m4_require([_$0_PREPARE])dnl +AS_LITERAL_IF([$1], + [m4_patsubst(m4_translit([[$1]], [*+], [pp]), + [[^a-zA-Z0-9_]], [_])], + [`echo "$1" | $as_tr_sh`])]) + + +# _AS_TR_CPP_PREPARE +# ------------------ +m4_defun([_AS_TR_CPP_PREPARE], +[m4_require([_AS_CR_PREPARE])dnl +# Sed expression to map a string onto a valid CPP name. +as_tr_cpp="sed y%*$as_cr_letters%P$as_cr_LETTERS%;s%[[^_$as_cr_alnum]]%_%g" +]) + + +# AS_TR_CPP(EXPRESSION) +# --------------------- +# Map EXPRESSION to an upper case string which is valid as rhs for a +# `#define'. sh/m4 polymorphic. Be sure to update the definition +# of `$as_tr_cpp' if you change this. +m4_defun([AS_TR_CPP], +[m4_require([_$0_PREPARE])dnl +AS_LITERAL_IF([$1], + [m4_patsubst(m4_translit([[$1]], + [*abcdefghijklmnopqrstuvwxyz], + [PABCDEFGHIJKLMNOPQRSTUVWXYZ]), + [[^A-Z0-9_]], [_])], + [`echo "$1" | $as_tr_cpp`])]) + + +# _AS_TR_PREPARE +# -------------- +m4_defun([_AS_TR_PREPARE], +[m4_require([_AS_TR_SH_PREPARE])dnl +m4_require([_AS_TR_CPP_PREPARE])dnl +]) + + + + +## --------------------------------------------------- ## +## Common m4/sh handling of variables (indirections). ## +## --------------------------------------------------- ## + + +# The purpose of this section is to provide a uniform API for +# reading/setting sh variables with or without indirection. +# Typically, one can write +# AS_VAR_SET(var, val) +# or +# AS_VAR_SET(as_$var, val) +# and expect the right thing to happen. + + +# AS_VAR_SET(VARIABLE, VALUE) +# --------------------------- +# Set the VALUE of the shell VARIABLE. +# If the variable contains indirections (e.g. `ac_cv_func_$ac_func') +# perform whenever possible at m4 level, otherwise sh level. +m4_define([AS_VAR_SET], +[AS_LITERAL_IF([$1], + [$1=$2], + [eval "$1=$2"])]) + + +# AS_VAR_GET(VARIABLE) +# -------------------- +# Get the value of the shell VARIABLE. +# Evaluates to $VARIABLE if there are no indirection in VARIABLE, +# else into the appropriate `eval' sequence. +m4_define([AS_VAR_GET], +[AS_LITERAL_IF([$1], + [$[]$1], + [`eval echo '${'"m4_patsubst($1, [[\\`]], [\\\&])"'}'`])]) + + +# AS_VAR_TEST_SET(VARIABLE) +# ------------------------- +# Expands into the `test' expression which is true if VARIABLE +# is set. Polymorphic. Should be dnl'ed. +m4_define([AS_VAR_TEST_SET], +[AS_LITERAL_IF([$1], + [test "${$1+set}" = set], + [eval "test \"\${$1+set}\" = set"])]) + + +# AS_VAR_SET_IF(VARIABLE, IF-TRUE, IF-FALSE) +# ------------------------------------------ +# Implement a shell `if-then-else' depending whether VARIABLE is set +# or not. Polymorphic. +m4_define([AS_VAR_SET_IF], +[AS_IF([AS_VAR_TEST_SET([$1])], [$2], [$3])]) + + +# AS_VAR_PUSHDEF and AS_VAR_POPDEF +# -------------------------------- +# + +# Sometimes we may have to handle literals (e.g. `stdlib.h'), while at +# other moments, the same code may have to get the value from a +# variable (e.g., `ac_header'). To have a uniform handling of both +# cases, when a new value is about to be processed, declare a local +# variable, e.g.: +# +# AS_VAR_PUSHDEF([header], [ac_cv_header_$1]) +# +# and then in the body of the macro, use `header' as is. It is of +# first importance to use `AS_VAR_*' to access this variable. Don't +# quote its name: it must be used right away by m4. +# +# If the value `$1' was a literal (e.g. `stdlib.h'), then `header' is +# in fact the value `ac_cv_header_stdlib_h'. If `$1' was indirect, +# then `header's value in m4 is in fact `$ac_header', the shell +# variable that holds all of the magic to get the expansion right. +# +# At the end of the block, free the variable with +# +# AS_VAR_POPDEF([header]) + + +# AS_VAR_PUSHDEF(VARNAME, VALUE) +# ------------------------------ +# Define the m4 macro VARNAME to an accessor to the shell variable +# named VALUE. VALUE does not need to be a valid shell variable name: +# the transliteration is handled here. To be dnl'ed. +m4_define([AS_VAR_PUSHDEF], +[AS_LITERAL_IF([$2], + [m4_pushdef([$1], [AS_TR_SH($2)])], + [as_$1=AS_TR_SH($2) +m4_pushdef([$1], [$as_[$1]])])]) + + +# AS_VAR_POPDEF(VARNAME) +# ---------------------- +# Free the shell variable accessor VARNAME. To be dnl'ed. +m4_define([AS_VAR_POPDEF], +[m4_popdef([$1])]) + + + +## ----------------- ## +## Setting M4sh up. ## +## ----------------- ## + + +# AS_INIT +# ------- +m4_define([AS_INIT], +[m4_init + +# Forbidden tokens and exceptions. +m4_pattern_forbid([^_?AS_]) +]) |