m4sh.m4

MSYS在windows下模拟了一个类unix的终端

    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






## ------------------ ##
## 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"])
}])



## ------------------------------------ ##
## 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="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="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=$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
])