m4sh.m4

autoconf是一个产生可以自动配置源代码包

# 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


# _AS_TEST_PREPARE
# ----------------
# Find out ahead of time whether ``test -x'' can be used to distinguish
# executables from other regular files.
# FIXME: This should use "test -x /"; that's much faster.
m4_defun([_AS_TEST_PREPARE],
[# Find out whether ``test -x'' works.  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$$.file >/dev/null 2>&1; then
  as_executable_p="test -x"
else
  as_executable_p=:
fi
rm -f conf$$.file
])# _AS_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_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_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 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_text_wrap hacks^Wworks around the fact that m4_format does not
# know quadrigraphs.
#
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
])# AS_HELP_STRING


# 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).
m4_define([AS_TMPDIR],
[# Create a (secure) tmp directory for tmp files.
m4_if([$2], [], [: ${TMPDIR=/tmp}])
{
  tmp=`(umask 077 && mktemp -d "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`
/usr/bin/hostinfo      = `(/usr/bin/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_VERSION_COMPARE_PREPARE
# ---------------------------
# Output variables for comparing version numbers.
m4_defun([_AS_VERSION_COMPARE_PREPARE],
[[as_awk_strverscmp='
  # Use only awk features that work with 7th edition Unix awk (1978).
  # My, what an old awk you have, Mr. Solaris!
  END {
    while (length(v1) && length(v2)) {
      # Set d1 to be the next thing to compare from v1, and likewise for d2.
      # Normally this is a single character, but if v1 and v2 contain digits,
      # compare them as integers and fractions as strverscmp does.
      if (v1 ~ /^[0-9]/ && v2 ~ /^[0-9]/) {
	# Split v1 and v2 into their leading digit string components d1 and d2,
	# and advance v1 and v2 past the leading digit strings.
	for (len1 = 1; substr(v1, len1 + 1) ~ /^[0-9]/; len1++) continue
	for (len2 = 1; substr(v2, len2 + 1) ~ /^[0-9]/; len2++) continue
	d1 = substr(v1, 1, len1); v1 = substr(v1, len1 + 1)
	d2 = substr(v2, 1, len2); v2 = substr(v2, len2 + 1)
	if (d1 ~ /^0/) {
	  if (d2 ~ /^0/) {
	    # Compare two fractions.
	    while (d1 ~ /^0/ && d2 ~ /^0/) {
	      d1 = substr(d1, 2); len1--
	      d2 = substr(d2, 2); len2--
	    }
	    if (len1 != len2 && ! (len1 && len2 && substr(d1, 1, 1) == substr(d2, 1, 1))) {
	      # The two components differ in length, and the common prefix
	      # contains only leading zeros.  Consider the longer to be less.
	      d1 = -len1
	      d2 = -len2
	    } else {
	      # Otherwise, compare as strings.
	      d1 = "x" d1
	      d2 = "x" d2
	    }
	  } else {
	    # A fraction is less than an integer.
	    exit 1
	  }
	} else {
	  if (d2 ~ /^0/) {
	    # An integer is greater than a fraction.
	    exit 2
	  } else {
	    # Compare two integers.
	    d1 += 0
	    d2 += 0
	  }
	}
      } else {
	# The normal case, without worrying about digits.
	d1 = substr(v1, 1, 1); v1 = substr(v1, 2)
	d2 = substr(v2, 1, 1); v2 = substr(v2, 2)
      }
      if (d1 < d2) exit 1
      if (d1 > d2) exit 2
    }
    # Beware Solaris /usr/xgp4/bin/awk (at least through Solaris 10),
    # which mishandles some comparisons of empty strings to integers.
    if (length(v2)) exit 1
    if (length(v1)) exit 2
  }
']])# _AS_VERSION_COMPARE_PREPARE


# AS_VERSION_COMPARE(VERSION-1, VERSION-2,
#                    [ACTION-IF-LESS], [ACTION-IF-EQUAL], [ACTION-IF-GREATER])
# -----------------------------------------------------------------------------
# Compare two strings possibly containing shell variables as version strings.
m4_defun([AS_VERSION_COMPARE],
[AS_REQUIRE([_$0_PREPARE])dnl
as_arg_v1=$1
as_arg_v2=$2
dnl This usage is portable even to ancient awk,
dnl so don't worry about finding a "nice" awk version.
awk "$as_awk_strverscmp" v1="$as_arg_v1" v2="$as_arg_v2" /dev/null
case $? in
1) $3;;
0) $4;;
2) $5;;
esac[]dnl
])# _AS_VERSION_COMPARE



## ------------------------------------ ##
## 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.
# FIXME: This mishandles values that end in newlines, or have backslashes,
# or are '-n'.  Fixing this will require changing the API.
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],
	       [{ as_var=$1; eval "test \"\${$as_var+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_SHELL_FN_SPY
# ----------------
# This temporary macro checks "in the wild" for shells that do
# not support shell functions.
m4_define([_AS_SHELL_FN_SPY],
[_AS_DETECT_SUGGESTED([_AS_SHELL_FN_WORK])
_AS_RUN([_AS_SHELL_FN_WORK]) || {
  echo No shell found that supports shell functions.
  echo Please tell [e-mail] about your system,
  echo including any error possibly output before this
  echo message
}
])


# AS_INIT
# -------
# Initialize m4sh.
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-SANITIZE], [AS_SHELL_SANITIZE])
AS_REQUIRE([_AS_SHELL_FN_SPY])

# Let's go!
m4_divert_pop([KILL])[]dnl
m4_divert_push([BODY])[]dnl
])