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

m4_define([_AC_CANONICAL_SPLIT],
[AC_SUBST([$1],       [$ac_cv_$1])dnl
dnl FIXME: AC_SUBST([$1_alias],  [$ac_cv_$1_alias])dnl
AC_SUBST([$1_cpu],
         [`echo $ac_cv_$1 | sed 's/^\([[^-]]*\)-\([[^-]]*\)-\(.*\)$/\1/'`])dnl
AC_SUBST([$1_vendor],
         [`echo $ac_cv_$1 | sed 's/^\([[^-]]*\)-\([[^-]]*\)-\(.*\)$/\2/'`])dnl
AC_SUBST([$1_os],
         [`echo $ac_cv_$1 | sed 's/^\([[^-]]*\)-\([[^-]]*\)-\(.*\)$/\3/'`])dnl
])# _AC_CANONICAL_SPLIT


# AC_CANONICAL_BUILD
# ------------------
AC_DEFUN_ONCE([AC_CANONICAL_BUILD],
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
m4_divert_text([HELP_CANON],
[[
System types:
  --build=BUILD     configure for building on BUILD [guessed]]])dnl
# Make sure we can run config.sub.
$ac_config_sub sun4 >/dev/null 2>&1 ||
  AC_MSG_ERROR([cannot run $ac_config_sub])

AC_CACHE_CHECK([build system type], [ac_cv_build],
[ac_cv_build_alias=$build_alias
test -z "$ac_cv_build_alias" &&
  ac_cv_build_alias=`$ac_config_guess`
test -z "$ac_cv_build_alias" &&
  AC_MSG_ERROR([cannot guess build type; you must specify one])
ac_cv_build=`$ac_config_sub $ac_cv_build_alias` ||
  AC_MSG_ERROR([$ac_config_sub $ac_cv_build_alias failed])
])
_AC_CANONICAL_SPLIT(build)
])# AC_CANONICAL_BUILD


# AC_CANONICAL_HOST
# -----------------
AC_DEFUN_ONCE([AC_CANONICAL_HOST],
[AC_REQUIRE([AC_CANONICAL_BUILD])dnl
m4_divert_text([HELP_CANON],
[[  --host=HOST       cross-compile to build programs to run on HOST [BUILD]]])dnl
AC_CACHE_CHECK([host system type], [ac_cv_host],
[ac_cv_host_alias=$host_alias
test -z "$ac_cv_host_alias" &&
  ac_cv_host_alias=$ac_cv_build_alias
ac_cv_host=`$ac_config_sub $ac_cv_host_alias` ||
  AC_MSG_ERROR([$ac_config_sub $ac_cv_host_alias failed])
])
_AC_CANONICAL_SPLIT([host])
])# AC_CANONICAL_HOST


# AC_CANONICAL_TARGET
# -------------------
AC_DEFUN_ONCE([AC_CANONICAL_TARGET],
[AC_REQUIRE([AC_CANONICAL_HOST])dnl
AC_BEFORE([$0], [AC_ARG_PROGRAM])dnl
m4_divert_text([HELP_CANON],
[[  --target=TARGET   configure for building compilers for TARGET [HOST]]])dnl
AC_CACHE_CHECK([target system type], [ac_cv_target],
[dnl Set target_alias.
ac_cv_target_alias=$target_alias
test "x$ac_cv_target_alias" = "x" &&
  ac_cv_target_alias=$ac_cv_host_alias
ac_cv_target=`$ac_config_sub $ac_cv_target_alias` ||
  AC_MSG_ERROR([$ac_config_sub $ac_cv_target_alias failed])
])
_AC_CANONICAL_SPLIT([target])

# The aliases save the names the user supplied, while $host etc.
# will get canonicalized.
test -n "$target_alias" &&
  test "$program_prefix$program_suffix$program_transform_name" = \
    NONENONEs,x,x, &&
  program_prefix=${target_alias}-[]dnl
])# AC_CANONICAL_TARGET


AU_ALIAS([AC_CANONICAL_SYSTEM], [AC_CANONICAL_TARGET])


# AU::AC_VALIDATE_CACHED_SYSTEM_TUPLE([CMD])
# ------------------------------------------
# If the cache file is inconsistent with the current host,
# target and build system types, execute CMD or print a default
# error message.  Now handled via _AC_ARG_VAR_PRECIOUS.
AU_DEFUN([AC_VALIDATE_CACHED_SYSTEM_TUPLE], [])


## ---------------------- ##
## Caching test results.  ##
## ---------------------- ##


# AC_SITE_LOAD
# ------------
# Look for site or system specific initialization scripts.
m4_define([AC_SITE_LOAD],
[# Prefer explicitly selected file to automatically selected ones.
if test -z "$CONFIG_SITE"; then
  if test "x$prefix" != xNONE; then
    CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site"
  else
    CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site"
  fi
fi
for ac_site_file in $CONFIG_SITE; do
  if test -r "$ac_site_file"; then
    AC_MSG_NOTICE([loading site script $ac_site_file])
    sed 's/^/| /' "$ac_site_file" >&AS_MESSAGE_LOG_FD
    . "$ac_site_file"
  fi
done
])


# AC_CACHE_LOAD
# -------------
m4_define([AC_CACHE_LOAD],
[if test -r "$cache_file"; then
  # Some versions of bash will fail to source /dev/null (special
  # files actually), so we avoid doing that.
  if test -f "$cache_file"; then
    AC_MSG_NOTICE([loading cache $cache_file])
    case $cache_file in
      [[\\/]]* | ?:[[\\/]]* ) . $cache_file;;
      *)                      . ./$cache_file;;
    esac
  fi
else
  AC_MSG_NOTICE([creating cache $cache_file])
  >$cache_file
fi
])# AC_CACHE_LOAD


# _AC_CACHE_DUMP
# --------------
# Dump the cache to stdout.  It can be in a pipe (this is a requirement).
m4_define([_AC_CACHE_DUMP],
[# The following way of writing the cache mishandles newlines in values,
# but we know of no workaround that is simple, portable, and efficient.
# So, don't put newlines in cache variables' values.
# Ultrix sh set writes to stderr and can't be redirected directly,
# and sets the high bit in the cache file unless we assign to the vars.
{
  (set) 2>&1 |
    case `(ac_space=' '; set | grep ac_space) 2>&1` in
    *ac_space=\ *)
      # `set' does not quote correctly, so add quotes (double-quote
      # substitution turns \\\\ into \\, and sed turns \\ into \).
      sed -n \
        ["s/'/'\\\\''/g;
    	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='\\2'/p"]
      ;;
    *)
      # `set' quotes correctly as required by POSIX, so do not add quotes.
      sed -n \
        ["s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1=\\2/p"]
      ;;
    esac;
}dnl
])# _AC_CACHE_DUMP


# AC_CACHE_SAVE
# -------------
# Save the cache.
# Allow a site initialization script to override cache values.
m4_define([AC_CACHE_SAVE],
[cat >confcache <<\_ACEOF
# This file is a shell script that caches the results of configure
# tests run on this system so they can be shared between configure
# scripts and configure runs, see configure's option --config-cache.
# It is not useful on other systems.  If it contains results you don't
# want to keep, you may remove or edit it.
#
# config.status only pays attention to the cache file if you give it
# the --recheck option to rerun configure.
#
# `ac_cv_env_foo' variables (set or unset) will be overridden when
# loading this file, other *unset* `ac_cv_foo' will be assigned the
# following values.

_ACEOF

_AC_CACHE_DUMP() |
  sed ['
     t clear
     : clear
     s/^\([^=]*\)=\(.*[{}].*\)$/test "${\1+set}" = set || &/
     t end
     /^ac_cv_env/!s/^\([^=]*\)=\(.*\)$/\1=${\1=\2}/
     : end'] >>confcache
if diff $cache_file confcache >/dev/null 2>&1; then :; else
  if test -w $cache_file; then
    test "x$cache_file" != "x/dev/null" && echo "updating cache $cache_file"
    cat confcache >$cache_file
  else
    echo "not updating unwritable cache $cache_file"
  fi
fi
rm -f confcache[]dnl
])# AC_CACHE_SAVE


# AC_CACHE_VAL(CACHE-ID, COMMANDS-TO-SET-IT)
# ------------------------------------------
# The name of shell var CACHE-ID must contain `_cv_' in order to get saved.
# Should be dnl'ed.  Try to catch common mistakes.
m4_defun([AC_CACHE_VAL],
[m4_bmatch([$2], [AC_DEFINE],
           [AC_DIAGNOSE(syntax,
[$0($1, ...): suspicious presence of an AC_DEFINE in the second argument, ]dnl
[where no actions should be taken])])dnl
AS_VAR_SET_IF([$1],
              [_AS_ECHO_N([(cached) ])],
              [$2])])


# AC_CACHE_CHECK(MESSAGE, CACHE-ID, COMMANDS)
# -------------------------------------------
# Do not call this macro with a dnl right behind.
m4_defun([AC_CACHE_CHECK],
[AC_MSG_CHECKING([$1])
AC_CACHE_VAL([$2], [$3])dnl
AC_MSG_RESULT_UNQUOTED([AS_VAR_GET([$2])])])



## ---------------------- ##
## Defining CPP symbols.  ##
## ---------------------- ##


# AC_DEFINE_TRACE_LITERAL(LITERAL-CPP-SYMBOL)
# -------------------------------------------
# This macro is useless, it is used only with --trace to collect the
# list of *literals* CPP values passed to AC_DEFINE/AC_DEFINE_UNQUOTED.
m4_define([AC_DEFINE_TRACE_LITERAL])


# AC_DEFINE_TRACE(CPP-SYMBOL)
# ---------------------------
# This macro is a wrapper around AC_DEFINE_TRACE_LITERAL which filters
# out non literal symbols.
m4_define([AC_DEFINE_TRACE],
[AS_LITERAL_IF([$1], [AC_DEFINE_TRACE_LITERAL([$1])])])


# AC_DEFINE(VARIABLE, [VALUE], [DESCRIPTION])
# -------------------------------------------
# Set VARIABLE to VALUE, verbatim, or 1.  Remember the value
# and if VARIABLE is affected the same VALUE, do nothing, else
# die.  The third argument is used by autoheader.
m4_define([AC_DEFINE],
[AC_DEFINE_TRACE([$1])dnl
m4_ifval([$3], [AH_TEMPLATE([$1], [$3])])dnl
cat >>confdefs.h <<\_ACEOF
[@%:@define] $1 m4_if($#, 2, [$2], $#, 3, [$2], 1)
_ACEOF
])


# AC_DEFINE_UNQUOTED(VARIABLE, [VALUE], [DESCRIPTION])
# ----------------------------------------------------
# Similar, but perform shell substitutions $ ` \ once on VALUE.
m4_define([AC_DEFINE_UNQUOTED],
[AC_DEFINE_TRACE([$1])dnl
m4_ifval([$3], [AH_TEMPLATE([$1], [$3])])dnl
cat >>confdefs.h <<_ACEOF
[@%:@define] $1 m4_if($#, 2, [$2], $#, 3, [$2], 1)
_ACEOF
])



## -------------------------- ##
## Setting output variables.  ##
## -------------------------- ##


# AC_SUBST(VARIABLE, [VALUE])
# ---------------------------
# Create an output variable from a shell VARIABLE.  If VALUE is given
# assign it to VARIABLE.  Use `""' is you want to set VARIABLE to an
# empty value, not an empty second argument.
#
# Beware that if you change this macro, you also have to change the
# sed script at the top of _AC_OUTPUT_FILES.
m4_define([AC_SUBST],
[m4_ifvaln([$2], [$1=$2])[]dnl
m4_append_uniq([_AC_SUBST_VARS], [$1], [ ])dnl
])# AC_SUBST


# AC_SUBST_FILE(VARIABLE)
# -----------------------
# Read the comments of the preceding macro.
m4_define([AC_SUBST_FILE],
[m4_append_uniq([_AC_SUBST_FILES], [$1], [ ])])



## --------------------------------------- ##
## Printing messages at autoconf runtime.  ##
## --------------------------------------- ##

# In fact, I think we should promote the use of m4_warn and m4_fatal
# directly.  This will also avoid to some people to get it wrong
# between AC_FATAL and AC_MSG_ERROR.


# AC_DIAGNOSE(CATEGORY, MESSAGE)
# AC_FATAL(MESSAGE, [EXIT-STATUS])
# --------------------------------
m4_copy([m4_warn],  [AC_DIAGNOSE])
m4_copy([m4_fatal], [AC_FATAL])


# AC_WARNING(MESSAGE)
# -------------------
# Report a MESSAGE to the user of autoconf if `-W' or `-W all' was
# specified.
m4_define([AC_WARNING],
[AC_DIAGNOSE([syntax], [$1])])




## ---------------------------------------- ##
## Printing messages at configure runtime.  ##
## ---------------------------------------- ##


# AC_MSG_CHECKING(FEATURE)
# ------------------------
m4_define([AC_MSG_CHECKING],
[_AS_ECHO([$as_me:$LINENO: checking $1], AS_MESSAGE_LOG_FD)
_AS_ECHO_N([checking $1... ])[]dnl
])


# AC_MSG_RESULT(RESULT)
# ---------------------
m4_define([AC_MSG_RESULT],
[_AS_ECHO([$as_me:$LINENO: result: $1], AS_MESSAGE_LOG_FD)
_AS_ECHO([${ECHO_T}$1])[]dnl
])


# AC_MSG_RESULT_UNQUOTED(RESULT)
# ------------------------------
# Likewise, but perform $ ` \ shell substitutions.
m4_define([AC_MSG_RESULT_UNQUOTED],
[_AS_ECHO_UNQUOTED([$as_me:$LINENO: result: $1], AS_MESSAGE_LOG_FD)
_AS_ECHO_UNQUOTED([${ECHO_T}$1])[]dnl
])


# AC_MSG_WARN(PROBLEM)
# AC_MSG_NOTICE(STRING)
# AC_MSG_ERROR(ERROR, [EXIT-STATUS = 1])
# AC_MSG_FAILURE(ERROR, [EXIT-STATUS = 1])
# ----------------------------------------
m4_copy([AS_WARN],    [AC_MSG_WARN])
m4_copy([AS_MESSAGE], [AC_MSG_NOTICE])
m4_copy([AS_ERROR],   [AC_MSG_ERROR])
m4_define([AC_MSG_FAILURE],
[AC_MSG_ERROR([$1
See `config.log' for more details.], [$2])])


# _AC_MSG_LOG_CONFTEST
# --------------------
m4_define([_AC_MSG_LOG_CONFTEST],
[echo "$as_me: failed program was:" >&AS_MESSAGE_LOG_FD
sed 's/^/| /' conftest.$ac_ext >&AS_MESSAGE_LOG_FD
])


# AU::AC_CHECKING(FEATURE)
# ------------------------
AU_DEFUN([AC_CHECKING],
[AS_MESSAGE([checking $1...])])


# AU::AC_VERBOSE(STRING)
# ----------------------
AU_ALIAS([AC_VERBOSE], [AC_MSG_RESULT])






## ---------------------------- ##
## C