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# 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. 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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])], [$2])]) # _AS_ECHO_N_PREPARE # ------------------ # Check whether to use -n, \c, or newline-tab to separate # checking messages from result messages. # Don't try to cache, since the results of this macro are needed to # display the checking message. 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Portable versions of common tools. ## ## -------------------------------------- ## # This section is lexicographically sorted. # AS_DIRNAME(PATHNAME) # -------------------- # Simulate running `dirname(1)' on PATHNAME, not all systems have it. # This macro must be usable from inside ` `. # # Prefer expr to echo|sed, since expr is usually faster and it handles # backslashes and newlines correctly. However, older expr # implementations (e.g. SunOS 4 expr and Solaris 8 /usr/ucb/expr) have # a silly length limit that causes expr to fail if the matched # substring is longer than 120 bytes. 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When a fall back to expr (as in AS_DIRNAME) # is provided, you get twice the result. Prevent this. m4_defun([_AS_EXPR_PREPARE], [if expr a : '$a$' >/dev/null 2>&1; then as_expr=expr else as_expr=false fi ])# _AS_EXPR_PREPARE # _AS_LINENO_WORKS # --------------- # Succeed if the currently executing shell supports LINENO. # This macro does not expand to a single shell command, so be careful # when using it. 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Autoconf is especially sensible to this). . ./$as_me.lineno # Exit status is that of the last command. exit } ])# _AS_LINENO_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_PATH_SEPARATOR_PREPARE # -------------------------- # Compute the path separator. m4_defun([_AS_PATH_SEPARATOR_PREPARE], [# The user is always right. if test "${PATH_SEPARATOR+set}" != set; then echo "#! /bin/sh" >conf$$.sh echo "exit 0" >>conf$$.sh chmod +x conf$$.sh if (PATH="/nonexistent;."; conf$$.sh) >/dev/null 2>&1; then PATH_SEPARATOR=';' else PATH_SEPARATOR=: fi rm -f conf$$.sh fi ])# _AS_PATH_SEPARATOR_PREPARE # _AS_PATH_WALK([PATH = $PATH], BODY) # ----------------------------------- # Walk through PATH running BODY for each `as_dir'. # # Still very private as its interface looks quite bad. # # `$as_dummy' forces splitting on constant user-supplied paths. # POSIX.2 field splitting is done only on the result of word # expansions, not on literal text. This closes a longstanding sh security # hole. Optimize it away when not needed, i.e., if there are no literal # path separators. m4_define([_AS_PATH_WALK], [AS_REQUIRE([_AS_PATH_SEPARATOR_PREPARE])dnl as_save_IFS=$IFS; IFS=$PATH_SEPARATOR m4_bmatch([$1], [[:;]], [as_dummy="$1" for as_dir in $as_dummy], [for as_dir in m4_default([$1], [$PATH])]) do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. $2 done ]) # 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], [AS_REQUIRE([_AS_LN_S_PREPARE])dnl $as_ln_s $1 $2 ]) # _AS_MKDIR_P_PREPARE # ------------------- m4_defun([_AS_MKDIR_P_PREPARE], [if mkdir -p . 2>/dev/null; then as_mkdir_p=: else test -d ./-p && rmdir ./-p as_mkdir_p=false fi ])# _AS_MKDIR_P_PREPARE # AS_MKDIR_P(PATH) # ---------------- # Emulate `mkdir -p' with plain `mkdir'. m4_define([AS_MKDIR_P], [AS_REQUIRE([_$0_PREPARE])dnl { if $as_mkdir_p; then mkdir -p $1 else as_dir=$1 as_dirs= while test ! -d "$as_dir"; do as_dirs="$as_dir $as_dirs" as_dir=`AS_DIRNAME("$as_dir")` done test ! -n "$as_dirs" || mkdir $as_dirs fi || AS_ERROR([cannot create directory $1]); } ])# 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 # AS_SET_CATFILE(VAR, DIR-NAME, FILE-NAME) # ---------------------------------------- # Set VAR to DIR-NAME/FILE-NAME. # Optimize the common case where $2 or $3 is '.'. m4_define([AS_SET_CATFILE], [case $2 in .) $1=$3;; *) case $3 in .) $1=$2;; [[\\/]]* | ?:[[\\/]]* ) $1=$3;; *) $1=$2/$3;; esac;; esac[]dnl ])# AS_SET_CATFILE ## ------------------ ## ## 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($@)])]) # _AS_BOX_LITERAL(MESSAGE, [FRAME-CHARACTER = `-']) # ------------------------------------------------- m4_define([_AS_BOX_LITERAL], [cat <<\_ASBOX m4_text_box($@) _ASBOX]) # _AS_BOX_INDIR(MESSAGE, [FRAME-CHARACTER = `-']) # ----------------------------------------------- m4_define([_AS_BOX_INDIR], [sed 'h;s/./m4_default([$2], [-])/g;s/^.../@%:@@%:@ /;s/...$/ @%:@@%:@/;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_bmatch([$1], [[`$]], [$3], [$2])]) # AS_TMPDIR(PREFIX, [DIRECTORY = $TMPDIR [= /tmp]]) # ------------------------------------------------- # Create as safely as possible a temporary directory in 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. m4_if([$2], [], [: ${TMPDIR=/tmp}]) { tmp=`(umask 077 && mktemp -d -q "m4_default([$2], [$TMPDIR])/$1XXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" } || { tmp=m4_default([$2], [$TMPDIR])/$1$$-$RANDOM (umask 077 && mkdir $tmp) } || { echo "$me: cannot create a temporary directory in m4_default([$2], [$TMPDIR])" >&2 AS_EXIT }dnl ])# AS_TMPDIR # AS_UNAME # -------- # Try to describe this machine. Meant for logs. m4_define([AS_UNAME], [{ cat <<_ASUNAME m4_text_box([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` _ASUNAME _AS_PATH_WALK([$PATH], [echo "PATH: $as_dir"]) }]) # AS_HELP_STRING(LHS, RHS, [COLUMN]) # ---------------------------------- # # Format a help string so that it looks pretty when # the user executes "script --help". This macro takes three # arguments, a "left hand side" (LHS), a "right hand side" (RHS), and # the COLUMN which is a string of white spaces which leads to the # the RHS column (default: 26 white spaces). # # The resulting string is suitable for use in other macros that require # a help string (e.g. AC_ARG_WITH). # # Here is the sample string from the Autoconf manual (Node: External # Software) which shows the proper spacing for help strings. # # --with-readline support fancy command line editing # ^ ^ ^ # | | | # | column 2 column 26 # | # column 0 # # A help string is made up of a "left hand side" (LHS) and a "right # hand side" (RHS). In the example above, the LHS is # "--with-readline", while the RHS is "support fancy command line # editing". # # If the LHS is contains more than (COLUMN - 3) characters, then the LHS # is terminated with a newline so that the RHS starts on a line of its # own beginning with COLUMN. In the default case, this corresponds to # an LHS with more than 23 characters. # # Therefore, in the example, if the LHS were instead # "--with-readline-blah-blah-blah", then the AS_HELP_STRING macro would # expand into: # # # --with-readline-blah-blah-blah # ^ ^ support fancy command line editing # | | ^ # | column 2 | # column 0 column 26 # m4_define([AS_HELP_STRING], [m4_pushdef([AS_Prefix], m4_default([$3], [ ]))dnl m4_pushdef([AS_Prefix_Format], [ %-]m4_eval(m4_len(AS_Prefix) - 3)[s ])dnl [ %-23s ] m4_text_wrap([$2], AS_Prefix, m4_format(AS_Prefix_Format, [$1]))dnl m4_popdef([AS_Prefix_Format])dnl m4_popdef([AS_Prefix])dnl ]) ## ------------------------------------ ## ## 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], [AS_REQUIRE([_AS_CR_PREPARE])dnl # Sed expression to map a string onto a valid variable name. as_tr_sh="eval 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], [AS_REQUIRE([_$0_PREPARE])dnl AS_LITERAL_IF([$1], [m4_bpatsubst(m4_translit([[$1]], [*+], [pp]), [[^a-zA-Z0-9_]], [_])], [`echo "$1" | $as_tr_sh`])]) # _AS_TR_CPP_PREPARE # ------------------ m4_defun([_AS_TR_CPP_PREPARE], [AS_REQUIRE([_AS_CR_PREPARE])dnl # Sed expression to map a string onto a valid CPP name. as_tr_cpp="eval 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], [AS_REQUIRE([_$0_PREPARE])dnl AS_LITERAL_IF([$1], [m4_bpatsubst(m4_translit([[$1]], [*abcdefghijklmnopqrstuvwxyz], [PABCDEFGHIJKLMNOPQRSTUVWXYZ]), [[^A-Z0-9_]], [_])], [`echo "$1" | $as_tr_cpp`])]) # _AS_TR_PREPARE # -------------- m4_defun([_AS_TR_PREPARE], [AS_REQUIRE([_AS_TR_SH_PREPARE])dnl AS_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=AS_ESCAPE([$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_bpatsubst($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_]) # Bangshe and minimal initialization. m4_divert_text([BINSH], [@%:@! /bin/sh]) m4_divert_text([M4SH-INIT], [AS_SHELL_SANITIZE]) # Let's go! m4_wrap([m4_divert_pop([BODY])[]]) m4_divert_push([BODY])[]dnl ])