general.m4

LINUX下的源码工具,可自己分析,或者直接装在系统上作为应用

    AS_BOX([Cache variables.])
    echo
    m4_bpatsubsts(m4_defn([_AC_CACHE_DUMP]),
                  [^ *\(#.*\)?
],                [],
                  ['], ['"'"'])
    echo

    AS_BOX([Output variables.])
    echo
    for ac_var in $ac_subst_vars
    do
      eval ac_val=$`echo $ac_var`
      echo "$ac_var='"'"'$ac_val'"'"'"
    done | sort
    echo

    if test -n "$ac_subst_files"; then
      AS_BOX([Output files.])
      echo
      for ac_var in $ac_subst_files
      do
	eval ac_val=$`echo $ac_var`
        echo "$ac_var='"'"'$ac_val'"'"'"
      done | sort
      echo
    fi

    if test -s confdefs.h; then
      AS_BOX([confdefs.h.])
      echo
      sed "/^$/d" confdefs.h | sort
      echo
    fi
    test "$ac_signal" != 0 &&
      echo "$as_me: caught signal $ac_signal"
    echo "$as_me: exit $exit_status"
  } >&AS_MESSAGE_LOG_FD
  rm -f core core.* *.core &&
  rm -rf conftest* confdefs* conf$[$]* $ac_clean_files &&
    exit $exit_status
     ' 0
for ac_signal in 1 2 13 15; do
  trap 'ac_signal='$ac_signal'; AS_EXIT([1])' $ac_signal
done
ac_signal=0

# confdefs.h avoids OS command line length limits that DEFS can exceed.
rm -rf conftest* confdefs.h
# AIX cpp loses on an empty file, so make sure it contains at least a newline.
echo >confdefs.h

# Predefined preprocessor variables.
AC_DEFINE_UNQUOTED([PACKAGE_NAME], ["$PACKAGE_NAME"],
                   [Define to the full name of this package.])
AC_DEFINE_UNQUOTED([PACKAGE_TARNAME], ["$PACKAGE_TARNAME"],
                   [Define to the one symbol short name of this package.])
AC_DEFINE_UNQUOTED([PACKAGE_VERSION], ["$PACKAGE_VERSION"],
                   [Define to the version of this package.])
AC_DEFINE_UNQUOTED([PACKAGE_STRING], ["$PACKAGE_STRING"],
                   [Define to the full name and version of this package.])
AC_DEFINE_UNQUOTED([PACKAGE_BUGREPORT], ["$PACKAGE_BUGREPORT"],
                   [Define to the address where bug reports for this package
                    should be sent.])

# Let the site file select an alternate cache file if it wants to.
AC_SITE_LOAD
AC_CACHE_LOAD
_AC_ARG_VAR_VALIDATE
_AC_ARG_VAR_PRECIOUS([build_alias])dnl
_AC_ARG_VAR_PRECIOUS([host_alias])dnl
_AC_ARG_VAR_PRECIOUS([target_alias])dnl
AC_LANG_PUSH(C)

dnl Substitute for predefined variables.
AC_SUBST([DEFS])dnl
AC_SUBST([ECHO_C])dnl
AC_SUBST([ECHO_N])dnl
AC_SUBST([ECHO_T])dnl
AC_SUBST([LIBS])dnl
m4_divert_pop([INIT_PREPARE])dnl
])# _AC_INIT_PREPARE


# AU::AC_INIT([UNIQUE-FILE-IN-SOURCE-DIR])
# ----------------------------------------
# This macro is used only for Autoupdate.
AU_DEFUN([AC_INIT],
[m4_ifval([$2], [[AC_INIT($@)]],
          [m4_ifval([$1],
[[AC_INIT]
AC_CONFIG_SRCDIR([$1])], [[AC_INIT]])])[]dnl
])


# AC_INIT([PACKAGE, VERSION, [BUG-REPORT])
# ----------------------------------------
# Include the user macro files, prepare the diversions, and output the
# preamble of the `configure' script.
# Note that the order is important: first initialize, then set the
# AC_CONFIG_SRCDIR.
m4_define([AC_INIT],
[# Forbidden tokens and exceptions.
m4_pattern_forbid([^_?A[CHUM]_])
m4_pattern_forbid([_AC_])
m4_pattern_forbid([^LIBOBJS$],
                  [do not use LIBOBJS directly, use AC_LIBOBJ (see section `AC_LIBOBJ vs LIBOBJS'])
# Actually reserved by M4sh.
m4_pattern_allow([^AS_FLAGS$])
AS_INIT
AS_PREPARE
m4_ifval([$2], [_AC_INIT_PACKAGE($@)])
_AC_INIT_DEFAULTS
_AC_INIT_PARSE_ARGS
_AC_INIT_SRCDIR
_AC_INIT_HELP
_AC_INIT_VERSION
_AC_INIT_CONFIG_LOG
_AC_INIT_PREPARE
_AC_INIT_NOTICE
_AC_INIT_COPYRIGHT
m4_ifval([$2], , [m4_ifval([$1], [AC_CONFIG_SRCDIR([$1])])])dnl
])




## ----------------------------- ##
## Selecting optional features.  ##
## ----------------------------- ##


# AC_ARG_ENABLE(FEATURE, HELP-STRING, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# ------------------------------------------------------------------------
AC_DEFUN([AC_ARG_ENABLE],
[m4_divert_once([HELP_ENABLE], [[
Optional Features:
  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]]])dnl
m4_divert_once([HELP_ENABLE], [$2])dnl
# Check whether --enable-$1 or --disable-$1 was given.
if test "[${enable_]m4_bpatsubst([$1], -, _)+set}" = set; then
  enableval="[$enable_]m4_bpatsubst([$1], -, _)"
  $3
m4_ifvaln([$4], [else
  $4])dnl
fi; dnl
])# AC_ARG_ENABLE


AU_DEFUN([AC_ENABLE],
[AC_ARG_ENABLE([$1], [  --enable-$1], [$2], [$3])])


## ------------------------------ ##
## Working with optional software ##
## ------------------------------ ##



# AC_ARG_WITH(PACKAGE, HELP-STRING, ACTION-IF-TRUE, [ACTION-IF-FALSE])
# --------------------------------------------------------------------
AC_DEFUN([AC_ARG_WITH],
[m4_divert_once([HELP_WITH], [[
Optional Packages:
  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)]])
m4_divert_once([HELP_WITH], [$2])dnl
# Check whether --with-$1 or --without-$1 was given.
if test "[${with_]m4_bpatsubst([$1], -, _)+set}" = set; then
  withval="[$with_]m4_bpatsubst([$1], -, _)"
  $3
m4_ifvaln([$4], [else
  $4])dnl
fi; dnl
])# AC_ARG_WITH

AU_DEFUN([AC_WITH],
[AC_ARG_WITH([$1], [  --with-$1], [$2], [$3])])



## ----------------------------------------- ##
## Remembering variables for reconfiguring.  ##
## ----------------------------------------- ##


# _AC_ARG_VAR_PRECIOUS(VARNAME)
# -----------------------------
# Declare VARNAME is precious.
#
# We try to diagnose when precious variables have changed.  To do this,
# make two early snapshots (after the option processing to take
# explicit variables into account) of those variables: one (ac_env_)
# which represents the current run, and a second (ac_cv_env_) which,
# at the first run, will be saved in the cache.  As an exception to
# the cache mechanism, its loading will override these variables (non
# `ac_cv_env_' cache value are only set when unset).
#
# In subsequent runs, after having loaded the cache, compare
# ac_cv_env_foo against ac_env_foo.  See _AC_ARG_VAR_VALIDATE.
m4_define([_AC_ARG_VAR_PRECIOUS],
[AC_SUBST([$1])dnl
m4_divert_once([PARSE_ARGS],
[ac_env_$1_set=${$1+set}
ac_env_$1_value=$$1
ac_cv_env_$1_set=${$1+set}
ac_cv_env_$1_value=$$1])dnl
])


# _AC_ARG_VAR_VALIDATE
# --------------------
# The precious variables are saved twice at the beginning of
# configure.  E.g., PRECIOUS is saved as `ac_env_PRECIOUS_SET' and
# `ac_env_PRECIOUS_VALUE' on the one hand and `ac_cv_env_PRECIOUS_SET'
# and `ac_cv_env_PRECIOUS_VALUE' on the other hand.
#
# Now the cache has just been loaded, so `ac_cv_env_' represents the
# content of the cached values, while `ac_env_' represents that of the
# current values.
#
# So we check that `ac_env_' and `ac_cv_env_' are consistent.  If
# they aren't, die.
m4_define([_AC_ARG_VAR_VALIDATE],
[# Check that the precious variables saved in the cache have kept the same
# value.
ac_cache_corrupted=false
for ac_var in `(set) 2>&1 |
               sed -n 's/^ac_env_\([[a-zA-Z_0-9]]*\)_set=.*/\1/p'`; do
  eval ac_old_set=\$ac_cv_env_${ac_var}_set
  eval ac_new_set=\$ac_env_${ac_var}_set
  eval ac_old_val="\$ac_cv_env_${ac_var}_value"
  eval ac_new_val="\$ac_env_${ac_var}_value"
  case $ac_old_set,$ac_new_set in
    set,)
      AS_MESSAGE([error: `$ac_var' was set to `$ac_old_val' in the previous run], 2)
      ac_cache_corrupted=: ;;
    ,set)
      AS_MESSAGE([error: `$ac_var' was not set in the previous run], 2)
      ac_cache_corrupted=: ;;
    ,);;
    *)
      if test "x$ac_old_val" != "x$ac_new_val"; then
        AS_MESSAGE([error: `$ac_var' has changed since the previous run:], 2)
        AS_MESSAGE([  former value:  $ac_old_val], 2)
        AS_MESSAGE([  current value: $ac_new_val], 2)
        ac_cache_corrupted=:
      fi;;
  esac
  # Pass precious variables to config.status.
  if test "$ac_new_set" = set; then
    case $ac_new_val in
dnl If you change this globbing pattern, test it on an old shell --
dnl it's sensitive.  Putting any kind of quote in it causes syntax errors.
[    *" "*|*"	"*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?\"\']*)]
      ac_arg=$ac_var=`echo "$ac_new_val" | sed "s/'/'\\\\\\\\''/g"` ;;
    *) ac_arg=$ac_var=$ac_new_val ;;
    esac
    case " $ac_configure_args " in
      *" '$ac_arg' "*) ;; # Avoid dups.  Use of quotes ensures accuracy.
      *) ac_configure_args="$ac_configure_args '$ac_arg'" ;;
    esac
  fi
done
if $ac_cache_corrupted; then
  AS_MESSAGE([error: changes in the environment can compromise the build], 2)
  AS_ERROR([run `make distclean' and/or `rm $cache_file' and start over])
fi
])# _AC_ARG_VAR_VALIDATE


# AC_ARG_VAR(VARNAME, DOCUMENTATION)
# ----------------------------------
# Register VARNAME as a precious variable, and document it in
# `configure --help' (but only once).
AC_DEFUN([AC_ARG_VAR],
[m4_divert_once([HELP_VAR], [[
Some influential environment variables:]])dnl
m4_divert_once([HELP_VAR_END], [[
Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.]])dnl
m4_expand_once([m4_divert_once([HELP_VAR],
                               [AC_HELP_STRING([$1], [$2], [              ])])],
               [$0($1)])dnl
_AC_ARG_VAR_PRECIOUS([$1])dnl
])# AC_ARG_VAR





## ---------------------------- ##
## Transforming program names.  ##
## ---------------------------- ##


# AC_ARG_PROGRAM
# --------------
# This macro is expanded only once, to avoid that `foo' ends up being
# installed as `ggfoo'.
AC_DEFUN_ONCE([AC_ARG_PROGRAM],
[dnl Document the options.
m4_divert_push([HELP_BEGIN])dnl

Program names:
  --program-prefix=PREFIX            prepend PREFIX to installed program names
  --program-suffix=SUFFIX            append SUFFIX to installed program names
  --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
m4_divert_pop([HELP_BEGIN])dnl
test "$program_prefix" != NONE &&
  program_transform_name="s,^,$program_prefix,;$program_transform_name"
# Use a double $ so make ignores it.
test "$program_suffix" != NONE &&
  program_transform_name="s,\$,$program_suffix,;$program_transform_name"
# Double any \ or $.  echo might interpret backslashes.
# By default was `s,x,x', remove it if useless.
cat <<\_ACEOF >conftest.sed
[s/[\\$]/&&/g;s/;s,x,x,$//]
_ACEOF
program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
rm conftest.sed
])# AC_ARG_PROGRAM





## ------------------------- ##
## Finding auxiliary files.  ##
## ------------------------- ##


# AC_CONFIG_AUX_DIR(DIR)
# ----------------------
# Find install-sh, config.sub, config.guess, and Cygnus configure
# in directory DIR.  These are auxiliary files used in configuration.
# DIR can be either absolute or relative to $srcdir.
AC_DEFUN([AC_CONFIG_AUX_DIR],
[AC_CONFIG_AUX_DIRS($1 $srcdir/$1)])


# AC_CONFIG_AUX_DIR_DEFAULT
# -------------------------
# The default is `$srcdir' or `$srcdir/..' or `$srcdir/../..'.
# There's no need to call this macro explicitly; just AC_REQUIRE it.
AC_DEFUN([AC_CONFIG_AUX_DIR_DEFAULT],
[AC_CONFIG_AUX_DIRS($srcdir $srcdir/.. $srcdir/../..)])


# AC_CONFIG_AUX_DIRS(DIR ...)
# ---------------------------
# Internal subroutine.
# Search for the configuration auxiliary files in directory list $1.
# We look only for install-sh, so users of AC_PROG_INSTALL
# do not automatically need to distribute the other auxiliary files.
AC_DEFUN([AC_CONFIG_AUX_DIRS],
[ac_aux_dir=
for ac_dir in $1; do
  if test -f $ac_dir/install-sh; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/install-sh -c"
    break
  elif test -f $ac_dir/install.sh; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/install.sh -c"
    break
  elif test -f $ac_dir/shtool; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/shtool install -c"
    break
  fi
done
if test -z "$ac_aux_dir"; then
  AC_MSG_ERROR([cannot find install-sh or install.sh in $1])
fi
ac_config_guess="$SHELL $ac_aux_dir/config.guess"
ac_config_sub="$SHELL $ac_aux_dir/config.sub"
ac_configure="$SHELL $ac_aux_dir/configure" # This should be Cygnus configure.
AC_PROVIDE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
])# AC_CONFIG_AUX_DIRS




## ----------------------------------- ##
## Getting the canonical system type.  ##
## ----------------------------------- ##

# The inputs are:
#    configure --host=HOST --target=TARGET --build=BUILD
#
# The rules are:
# 1. Build defaults to the current platform, as determined by config.guess.
# 2. Host defaults to build.
# 3. Target defaults to host.


# _AC_CANONICAL_SPLIT(THING)
# --------------------------
# Generate the variables THING, THING_{alias cpu vendor os}.