acinclude.m4

linux下常用的网络工具的代码

	    test "$iu_spath" || iu_spath="$PATH"

	    for iu_dir in `echo "$iu_spath" | sed 'y/:/ /'`; do
	      test -z "$iu_dir" && iu_dir=.
	      if test -$iu_test_type "$iu_dir/$iu_name"; then
		iu_val="$iu_dir/$iu_name"
		break
	      fi
	    done
	    ;;

	  no) iu_default=no;;
	  x|d|f|c|b) iu_test_type=$iu_try;;

	  *)
	    # Just try the given name, with make-var substitution.  Besides 
	    # yielding a value if found, this also sets the default.

	    case "$iu_try" in "\""*"\"")
	      # strip off quotes
	      iu_try="`echo $iu_try | sed -e 's/^.//' -e 's/.$//'`"
	    esac

	    test -z "$iu_default" && iu_default="$iu_try"
	    test "$cross_compiling" = yes && { iu_cross_test=yes; continue; }

	    # See if the value begins with a $(FOO)/${FOO} make variable
	    # corresponding to a shell variable, and if so set try_exp to the
	    # value thereof.  Recurse.
	    iu_try_exp="$iu_try"
	    changequote(,)
	    iu_try_var="`echo "$iu_try_exp" |sed -n 's;^\$[({]\([-_a-zA-Z]*\)[)}].*;\1;p'`"
	    while eval test \"$iu_try_var\" && eval test '${'$iu_try_var'+set}'; do
	      # yes, and there's a corresponding shell variable, which substitute
	      if eval test \"'$'"$iu_try_var"\" = NONE; then
		# Not filled in by configure yet
		case "$iu_try_var" in
		  prefix | exec_prefix)
		    iu_try_exp="$ac_default_prefix`echo "$iu_try_exp" |sed 's;^\$[({][-_a-zA-Z]*[)}];;'`";;
		esac
		iu_try_var=''	# Stop expansion here
	      else
		# Use the actual value of the shell variable
		eval iu_try_exp=\"`echo "$iu_try_exp" |sed 's;^\$[({]\([-_a-zA-Z]*\)[)}];\$\1;'`\"
		iu_try_var="`echo "$iu_try_exp" |sed -n 's;^\$[({]\([-_a-zA-Z]*\)[)}].*;\1;p'`"
	      fi
	    done
	    changequote([,])

	    test -$iu_test_type "$iu_try_exp" && iu_val="$iu_try"
	    ;;

	esac

	test "$iu_val" -o "$iu_hdr" && break
	test "$iu_cross_test" -a "$iu_prev_cross_test" && iu_cross_conflict=yes
	iu_prev_cross_test=$iu_cross_test
      done

      if test -z "$iu_val" -a -z "$iu_hdr"; then
	if test -z "$iu_default"; then
	  iu_val=no
	else
	  iu_val="$iu_default"
	  iu_defaulted="(default) "
	fi
      fi
    fi

    if test "$iu_val"; then
      AC_MSG_RESULT(${iu_cached}${iu_defaulted}$iu_val)
      test "$iu_cross_conflict" -a "$iu_defaulted" \
	&& AC_MSG_WARN(may be incorrect because of cross-compilation)
      # Put the value in the autoconf cache.  We replace $( with @( to avoid
      # variable evaluation problems when autoconf reads the cache later.
      echo inetutils_cv_$iu_pathvar=\'"`echo "$iu_val" | sed 's/\$(/@(/g'`"\'
    elif test "$iu_hdr"; then
      AC_MSG_RESULT(${iu_cached}from $iu_sym in $iu_hdr)
      echo inetutils_cv_hdr_$iu_pathvar=\'"$iu_hdr"\'
      echo inetutils_cv_hdr_sym_$iu_pathvar=\'"$iu_sym"\'
    fi
  done <[$1] >$iu_cache_file

  # Read the cache values constructed by the previous loop, 
  . $iu_cache_file

  # Construct the pathdefs file -- a file of make variable definitions, of
  # the form PATHDEF_FOO, that contain cc -D switches to define the cpp macro
  # PATH_FOO.
  grep -v '^inetutils_cv_hdr_' < $iu_cache_file | \
  while read iu_cache_set; do
    iu_var="`echo $iu_cache_set | sed 's/=.*$//'`"
    eval iu_val=\"'$'"$iu_var"\"
    # invert escaped $(...) notation used in autoconf cache
    eval iu_val=\"\`echo \'"$iu_val"\' \| sed \''s/@(/$\(/g'\'\`\"
    if test "$iu_val" != no; then
      iu_path="`echo $iu_var | sed -e 's/^inetutils_cv_//' -e y/${iu_lcase}/${IU_UCASE}/`"
      iu_pathdef="`echo $iu_path | sed 's/^PATH_/PATHDEF_/'`"
      echo $iu_pathdef = -D$iu_path='\"'"$iu_val"'\"'
      AC_DEFINE_UNQUOTED($iu_path, "$iu_val")
    fi
  done >$[$2]
  AC_SUBST_FILE([$2])

  # Generate a file of #ifdefs that defaults PATH_FOO macros to _PATH_FOO (or
  # some other symbol) (excluding any who's value is set to `no').
  grep '^inetutils_cv_hdr_sym_' < $iu_cache_file | \
  while read iu_cache_set; do
    iu_sym_var="`echo "$iu_cache_set" | sed 's/=.*$//'`"
    eval iu_sym=\"'$'"$iu_sym_var"\"
    iu_path="`echo $iu_sym_var | sed -e 's/^inetutils_cv_hdr_sym_//' -e y/${iu_lcase}/${IU_UCASE}/`"
    cat <<EOF
#ifndef $iu_path
#define $iu_path $iu_sym
#endif
EOF
  done >$[$3]
  AC_SUBST_FILE([$3])])

AC_DEFUN([IU_ENABLE_FOO],
 [AC_ARG_ENABLE($1, AS_HELP_STRING([--disable-$1], [don't compile $1]), ,
                [enable_]$1[=$enable_]$2)
[if test "$enable_$1" = yes; then 
   $1_BUILD=$1
   $1_INSTALL_HOOK="install-$1-hook"
else
   $1_BUILD=''
   $1_INSTALL_HOOK=''
fi;]
  AC_SUBST([$1_BUILD])
  AC_SUBST([$1_INSTALL_HOOK])
])

AC_DEFUN([IU_ENABLE_CLIENT], [IU_ENABLE_FOO($1, clients)])
AC_DEFUN([IU_ENABLE_SERVER], [IU_ENABLE_FOO($1, servers)])

#serial 12

dnl Initially derived from code in GNU grep.
dnl Mostly written by Jim Meyering.

dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
dnl
AC_DEFUN([jm_INCLUDED_REGEX],
  [
    dnl Even packages that don't use regex.c can use this macro.
    dnl Of course, for them it doesn't do anything.

    # Assume we'll default to using the included regex.c.
    ac_use_included_regex=yes

    # However, if the system regex support is good enough that it passes the
    # the following run test, then default to *not* using the included regex.c.
    # If cross compiling, assume the test would fail and use the included
    # regex.c.  The first failing regular expression is from `Spencer ere
    # test #75' in grep-2.3.
    AC_CACHE_CHECK([for working re_compile_pattern],
		   jm_cv_func_working_re_compile_pattern,
      AC_TRY_RUN(
[#include <stdio.h>
#include <regex.h>
	  int
	  main ()
	  {
	    static struct re_pattern_buffer regex;
	    const char *s;
	    struct re_registers regs;
	    re_set_syntax (RE_SYNTAX_POSIX_EGREP);
	    [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, &regex);]
	    /* This should fail with _Invalid character class name_ error.  */
	    if (!s)
	      exit (1);

	    /* This should succeed, but doesn't for e.g. glibc-2.1.3.  */
	    s = re_compile_pattern ("{1", 2, &regex);

	    if (s)
	      exit (1);

	    /* The following example is derived from a problem report
               against gawk from Jorge Stolfi <[e-mail]>.  */
	    s = re_compile_pattern ("[[an鵠]*n", 7, &regex);
	    if (s)
	      exit (1);

	    /* This should match, but doesn't for e.g. glibc-2.2.1.  */
	    if (re_match (&regex, "an", 2, 0, &regs) != 2)
	      exit (1);

	    exit (0);
	  }
	],
	       jm_cv_func_working_re_compile_pattern=yes,
	       jm_cv_func_working_re_compile_pattern=no,
	       dnl When crosscompiling, assume it's broken.
	       jm_cv_func_working_re_compile_pattern=no))
    if test $jm_cv_func_working_re_compile_pattern = yes; then
      ac_use_included_regex=no
    fi

    test -n "$1" || AC_MSG_ERROR([missing argument])
    m4_syscmd([test -f $1])
    ifelse(m4_sysval, 0,
      [
	AC_ARG_WITH([included-regex],
	            AC_HELP_STRING([--without-included-regex],
                                   [don't compile regex; this is the default on
                          systems with version 2 of the GNU C library
                          (use with caution on other system)]),
		    jm_with_regex=$withval,
		    jm_with_regex=$ac_use_included_regex)
	if test "$jm_with_regex" = yes; then
	  AC_LIBOBJ(regex)
	fi
      ],
    )
  ]
)

dnl IU_CHECK_KRB5(VERSION,PREFIX)
dnl Search for a Kerberos implementation in the standard locations plus PREFIX,
dnl if it is set and not "yes".
dnl VERSION should be either 4 or 5
dnl Defines KRB5_CFLAGS and KRB5_LIBS if found.
dnl Defines KRB_IMPL to "Heimdal", "MIT", or "OldMIT", or "none" if not found
AC_DEFUN([IU_CHECK_KRB5],
[
 if test "x$iu_cv_lib_krb5_libs" = x; then
  cache=""
  ## Make sure we have res_query
  AC_CHECK_LIB(resolv, res_query)
  KRB5_PREFIX=[$2]
  KRB5_IMPL="none"
  # First try krb5-config
  if test "$KRB5_PREFIX" != "yes"; then
    krb5_path="$KRB5_PREFIX/bin"
  else
    krb5_path="$PATH"
  fi
  AC_PATH_PROG(KRB5CFGPATH, krb5-config, none, $krb5_path)
  if test "$KRB5CFGPATH" != "none"; then
    KRB5_CFLAGS="$CPPFLAGS `$KRB5CFGPATH --cflags krb$1`"
    KRB5_LIBS="$LDFLAGS `$KRB5CFGPATH --libs krb$1`"
    KRB5_IMPL="Heimdal"
  else
    ## OK, try the old code
    saved_CPPFLAGS="$CPPFLAGS"
    saved_LDFLAGS="$LDFLAGS"
    saved_LIBS="$LIBS"
    if test "$KRB5_PREFIX" != "yes"; then
      KRB5_CFLAGS="-I$KRB5_PREFIX/include"
      KRB5_LDFLAGS="-L$KRB5_PREFIX/lib"
      CPPFLAGS="$CPPFLAGS $KRB5_CFLAGS"
      LDFLAGS="$LDFLAGS $KRB5_LDFLAGS"
    fi
    KRB4_LIBS="-lkrb4 -ldes425"

    ## Check for new MIT kerberos V support
    AC_CHECK_LIB(krb5, krb5_init_context,
      [KRB5_IMPL="MIT"
       KRB5_LIBS="$KRB5_LDFLAGS $KRB4_LIBS -lkrb5 -lk5crypto -lcom_err"]
       ,, -lk5crypto -lcom_err)

    ## Heimdal kerberos V support
    if test "$KRB5_IMPL" = "none"; then
      AC_CHECK_LIB(krb5, krb5_init_context,
        [KRB5_IMPL="Heimdal"
         KRB5_LIBS="$KRB5_LDFLAGS $KRB4_LIBS -lkrb5 -ldes -lasn1 -lroken -lcrypt -lcom_err"]
         ,, -ldes -lasn1 -lroken -lcrypt -lcom_err)
    fi

    ## Old MIT Kerberos V
    ## Note: older krb5 distributions use -lcrypto instead of
    ## -lk5crypto. This may conflict with OpenSSL.
    if test "$KRB5_IMPL" = "none"; then
      AC_CHECK_LIB(krb5, krb5_init_context,
        [KRB5_IMPL="OldMIT",
         KRB5_LIBS="$KRB5_LDFLAGS $KRB4_LIBS -lkrb5 -lkrb5 -lcrypto -lcom_err"]
        ,, -lcrypto -lcom_err)
    fi

    LDFLAGS="$saved_LDFLAGS"
    LIBS="$saved_LIBS"
  fi

  iu_cv_lib_krb5_cflags="$KRB5_CFLAGS"
  iu_cv_lib_krb5_libs="$KRB5_LIBS"
  iu_cv_lib_krb5_impl="$KRB5_IMPL"
 else
  cached=" (cached) "
  KRB5_CFLAGS="$iu_cv_lib_krb5_cflags"
  KRB5_LIBS="$iu_cv_lib_krb5_libs"
  KRB5_IMPL="$iu_cv_lib_krb5_impl"
 fi
 AC_MSG_CHECKING(krb5 implementation)
 AC_MSG_RESULT(${cached}$KRB5_IMPL)
])

dnl IU_CHECK_MEMBER(AGGREGATE.MEMBER,
dnl                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
dnl                [INCLUDES])
dnl AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos'.
dnl The member itself can be of an aggregate type
dnl Shell variables are not a valid argument.
AC_DEFUN([IU_CHECK_MEMBER],
[AS_LITERAL_IF([$1], [],
               [AC_FATAL([$0: requires literal arguments])])dnl
m4_bmatch([$1], [\.], ,
         [m4_fatal([$0: Did not see any dot in `$1'])])dnl
AS_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])dnl
dnl Extract the aggregate name, and the member name
AC_CACHE_CHECK([for $1], ac_Member,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])],
[dnl AGGREGATE ac_aggr;
static m4_bpatsubst([$1], [\..*]) ac_aggr;
dnl ac_aggr.MEMBER;
if (sizeof(ac_aggr.m4_bpatsubst([$1], [^[^.]*\.])))
return 0;])],
                [AS_VAR_SET(ac_Member, yes)],
                [AS_VAR_SET(ac_Member, no)])])
AS_IF([test AS_VAR_GET(ac_Member) = yes], [$2], [$3])dnl
AS_VAR_POPDEF([ac_Member])dnl
])dnl IU_CHECK_MEMBER


dnl IU_CHECK_MEMBERS([AGGREGATE.MEMBER, ...],
dnl                  [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]
dnl                  [INCLUDES])
AC_DEFUN([IU_CHECK_MEMBERS],
[m4_foreach([AC_Member], [$1],
  [IU_CHECK_MEMBER(AC_Member,
         [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_[]AC_Member), 1,
                            [Define to 1 if `]m4_bpatsubst(AC_Member,
                                                     [^[^.]*\.])[' is
                             member of `]m4_bpatsubst(AC_Member, [\..*])['.])
$2],
                 [$3],
                 [$4])])])