git.sesse.net Git - vlc/blob - m4/lib-link.m4

   1 # lib-link.m4 serial 13 (gettext-0.17)
   2 dnl Copyright (C) 2001-2007 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl From Bruno Haible.
   8
   9 AC_PREREQ(2.54)
  10
  11 dnl AC_LIB_LINKFLAGS(name [, dependencies]) searches for libname and
  12 dnl the libraries corresponding to explicit and implicit dependencies.
  13 dnl Sets and AC_SUBSTs the LIB${NAME} and LTLIB${NAME} variables and
  14 dnl augments the CPPFLAGS variable.
  15 dnl Sets and AC_SUBSTs the LIB${NAME}_PREFIX variable to nonempty if libname
  16 dnl was found in ${LIB${NAME}_PREFIX}/$acl_libdirstem.
  17 AC_DEFUN([AC_LIB_LINKFLAGS],
  18 [
  19   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  20   AC_REQUIRE([AC_LIB_RPATH])
  21   define([Name],[translit([$1],[./-], [___])])
  22   define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
  23                                [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
  24   AC_CACHE_CHECK([how to link with lib[]$1], [ac_cv_lib[]Name[]_libs], [
  25     AC_LIB_LINKFLAGS_BODY([$1], [$2])
  26     ac_cv_lib[]Name[]_libs="$LIB[]NAME"
  27     ac_cv_lib[]Name[]_ltlibs="$LTLIB[]NAME"
  28     ac_cv_lib[]Name[]_cppflags="$INC[]NAME"
  29     ac_cv_lib[]Name[]_prefix="$LIB[]NAME[]_PREFIX"
  30   ])
  31   LIB[]NAME="$ac_cv_lib[]Name[]_libs"
  32   LTLIB[]NAME="$ac_cv_lib[]Name[]_ltlibs"
  33   INC[]NAME="$ac_cv_lib[]Name[]_cppflags"
  34   LIB[]NAME[]_PREFIX="$ac_cv_lib[]Name[]_prefix"
  35   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
  36   AC_SUBST([LIB]NAME)
  37   AC_SUBST([LTLIB]NAME)
  38   AC_SUBST([LIB]NAME[_PREFIX])
  39   dnl Also set HAVE_LIB[]NAME so that AC_LIB_HAVE_LINKFLAGS can reuse the
  40   dnl results of this search when this library appears as a dependency.
  41   HAVE_LIB[]NAME=yes
  42   undefine([Name])
  43   undefine([NAME])
  44 ])
  45
  46 dnl AC_LIB_HAVE_LINKFLAGS(name, dependencies, includes, testcode)
  47 dnl searches for libname and the libraries corresponding to explicit and
  48 dnl implicit dependencies, together with the specified include files and
  49 dnl the ability to compile and link the specified testcode. If found, it
  50 dnl sets and AC_SUBSTs HAVE_LIB${NAME}=yes and the LIB${NAME} and
  51 dnl LTLIB${NAME} variables and augments the CPPFLAGS variable, and
  52 dnl #defines HAVE_LIB${NAME} to 1. Otherwise, it sets and AC_SUBSTs
  53 dnl HAVE_LIB${NAME}=no and LIB${NAME} and LTLIB${NAME} to empty.
  54 dnl Sets and AC_SUBSTs the LIB${NAME}_PREFIX variable to nonempty if libname
  55 dnl was found in ${LIB${NAME}_PREFIX}/$acl_libdirstem.
  56 AC_DEFUN([AC_LIB_HAVE_LINKFLAGS],
  57 [
  58   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  59   AC_REQUIRE([AC_LIB_RPATH])
  60   define([Name],[translit([$1],[./-], [___])])
  61   define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
  62                                [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
  63
  64   dnl Search for lib[]Name and define LIB[]NAME, LTLIB[]NAME and INC[]NAME
  65   dnl accordingly.
  66   AC_LIB_LINKFLAGS_BODY([$1], [$2])
  67
  68   dnl Add $INC[]NAME to CPPFLAGS before performing the following checks,
  69   dnl because if the user has installed lib[]Name and not disabled its use
  70   dnl via --without-lib[]Name-prefix, he wants to use it.
  71   ac_save_CPPFLAGS="$CPPFLAGS"
  72   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
  73
  74   AC_CACHE_CHECK([for lib[]$1], [ac_cv_lib[]Name], [
  75     ac_save_LIBS="$LIBS"
  76     LIBS="$LIBS $LIB[]NAME"
  77     AC_TRY_LINK([$3], [$4], [ac_cv_lib[]Name=yes], [ac_cv_lib[]Name=no])
  78     LIBS="$ac_save_LIBS"
  79   ])
  80   if test "$ac_cv_lib[]Name" = yes; then
  81     HAVE_LIB[]NAME=yes
  82     AC_DEFINE([HAVE_LIB]NAME, 1, [Define if you have the $1 library.])
  83     AC_MSG_CHECKING([how to link with lib[]$1])
  84     AC_MSG_RESULT([$LIB[]NAME])
  85   else
  86     HAVE_LIB[]NAME=no
  87     dnl If $LIB[]NAME didn't lead to a usable library, we don't need
  88     dnl $INC[]NAME either.
  89     CPPFLAGS="$ac_save_CPPFLAGS"
  90     LIB[]NAME=
  91     LTLIB[]NAME=
  92     LIB[]NAME[]_PREFIX=
  93   fi
  94   AC_SUBST([HAVE_LIB]NAME)
  95   AC_SUBST([LIB]NAME)
  96   AC_SUBST([LTLIB]NAME)
  97   AC_SUBST([LIB]NAME[_PREFIX])
  98   undefine([Name])
  99   undefine([NAME])
 100 ])
 101
 102 dnl Determine the platform dependent parameters needed to use rpath:
 103 dnl   acl_libext,
 104 dnl   acl_shlibext,
 105 dnl   acl_hardcode_libdir_flag_spec,
 106 dnl   acl_hardcode_libdir_separator,
 107 dnl   acl_hardcode_direct,
 108 dnl   acl_hardcode_minus_L.
 109 AC_DEFUN([AC_LIB_RPATH],
 110 [
 111   dnl Tell automake >= 1.10 to complain if config.rpath is missing.
 112   m4_ifdef([AC_REQUIRE_AUX_FILE], [AC_REQUIRE_AUX_FILE([config.rpath])])
 113   AC_REQUIRE([AC_PROG_CC])                dnl we use $CC, $GCC, $LDFLAGS
 114   AC_REQUIRE([AC_LIB_PROG_LD])            dnl we use $LD, $with_gnu_ld
 115   AC_REQUIRE([AC_CANONICAL_HOST])         dnl we use $host
 116   AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
 117   AC_CACHE_CHECK([for shared library run path origin], acl_cv_rpath, [
 118     CC="$CC" GCC="$GCC" LDFLAGS="$LDFLAGS" LD="$LD" with_gnu_ld="$with_gnu_ld" \
 119     ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.rpath" "$host" > conftest.sh
 120     . ./conftest.sh
 121     rm -f ./conftest.sh
 122     acl_cv_rpath=done
 123   ])
 124   wl="$acl_cv_wl"
 125   acl_libext="$acl_cv_libext"
 126   acl_shlibext="$acl_cv_shlibext"
 127   acl_libname_spec="$acl_cv_libname_spec"
 128   acl_library_names_spec="$acl_cv_library_names_spec"
 129   acl_hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec"
 130   acl_hardcode_libdir_separator="$acl_cv_hardcode_libdir_separator"
 131   acl_hardcode_direct="$acl_cv_hardcode_direct"
 132   acl_hardcode_minus_L="$acl_cv_hardcode_minus_L"
 133   dnl Determine whether the user wants rpath handling at all.
 134   AC_ARG_ENABLE(rpath,
 135     [  --disable-rpath         do not hardcode runtime library paths],
 136     :, enable_rpath=yes)
 137 ])
 138
 139 dnl AC_LIB_LINKFLAGS_BODY(name [, dependencies]) searches for libname and
 140 dnl the libraries corresponding to explicit and implicit dependencies.
 141 dnl Sets the LIB${NAME}, LTLIB${NAME} and INC${NAME} variables.
 142 dnl Also, sets the LIB${NAME}_PREFIX variable to nonempty if libname was found
 143 dnl in ${LIB${NAME}_PREFIX}/$acl_libdirstem.
 144 AC_DEFUN([AC_LIB_LINKFLAGS_BODY],
 145 [
 146   AC_REQUIRE([AC_LIB_PREPARE_MULTILIB])
 147   define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
 148                                [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
 149   dnl Autoconf >= 2.61 supports dots in --with options.
 150   define([N_A_M_E],[m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.61]),[-1],[translit([$1],[.],[_])],[$1])])
 151   dnl By default, look in $includedir and $libdir.
 152   use_additional=yes
 153   AC_LIB_WITH_FINAL_PREFIX([
 154     eval additional_includedir=\"$includedir\"
 155     eval additional_libdir=\"$libdir\"
 156   ])
 157   AC_LIB_ARG_WITH([lib]N_A_M_E[-prefix],
 158 [  --with-lib]N_A_M_E[-prefix[=DIR]  search for lib$1 in DIR/include and DIR/lib
 159   --without-lib]N_A_M_E[-prefix     don't search for lib$1 in includedir and libdir],
 160 [
 161     if test "X$withval" = "Xno"; then
 162       use_additional=no
 163     else
 164       if test "X$withval" = "X"; then
 165         AC_LIB_WITH_FINAL_PREFIX([
 166           eval additional_includedir=\"$includedir\"
 167           eval additional_libdir=\"$libdir\"
 168         ])
 169       else
 170         additional_includedir="$withval/include"
 171         additional_libdir="$withval/$acl_libdirstem"
 172       fi
 173     fi
 174 ])
 175   dnl Search the library and its dependencies in $additional_libdir and
 176   dnl $LDFLAGS. Using breadth-first-seach.
 177   LIB[]NAME=
 178   LTLIB[]NAME=
 179   INC[]NAME=
 180   LIB[]NAME[]_PREFIX=
 181   rpathdirs=
 182   ltrpathdirs=
 183   names_already_handled=
 184   names_next_round='$1 $2'
 185   while test -n "$names_next_round"; do
 186     names_this_round="$names_next_round"
 187     names_next_round=
 188     for name in $names_this_round; do
 189       already_handled=
 190       for n in $names_already_handled; do
 191         if test "$n" = "$name"; then
 192           already_handled=yes
 193           break
 194         fi
 195       done
 196       if test -z "$already_handled"; then
 197         names_already_handled="$names_already_handled $name"
 198         dnl See if it was already located by an earlier AC_LIB_LINKFLAGS
 199         dnl or AC_LIB_HAVE_LINKFLAGS call.
 200         uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'`
 201         eval value=\"\$HAVE_LIB$uppername\"
 202         if test -n "$value"; then
 203           if test "$value" = yes; then
 204             eval value=\"\$LIB$uppername\"
 205             test -z "$value" || LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$value"
 206             eval value=\"\$LTLIB$uppername\"
 207             test -z "$value" || LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$value"
 208           else
 209             dnl An earlier call to AC_LIB_HAVE_LINKFLAGS has determined
 210             dnl that this library doesn't exist. So just drop it.
 211             :
 212           fi
 213         else
 214           dnl Search the library lib$name in $additional_libdir and $LDFLAGS
 215           dnl and the already constructed $LIBNAME/$LTLIBNAME.
 216           found_dir=
 217           found_la=
 218           found_so=
 219           found_a=
 220           eval libname=\"$acl_libname_spec\"    # typically: libname=lib$name
 221           if test -n "$acl_shlibext"; then
 222             shrext=".$acl_shlibext"             # typically: shrext=.so
 223           else
 224             shrext=
 225           fi
 226           if test $use_additional = yes; then
 227             dir="$additional_libdir"
 228             dnl The same code as in the loop below:
 229             dnl First look for a shared library.
 230             if test -n "$acl_shlibext"; then
 231               if test -f "$dir/$libname$shrext"; then
 232                 found_dir="$dir"
 233                 found_so="$dir/$libname$shrext"
 234               else
 235                 if test "$acl_library_names_spec" = '$libname$shrext$versuffix'; then
 236                   ver=`(cd "$dir" && \
 237                         for f in "$libname$shrext".*; do echo "$f"; done \
 238                         | sed -e "s,^$libname$shrext\\\\.,," \
 239                         | sort -t '.' -n -r -k1,1 -k2,2 -k3,3 -k4,4 -k5,5 \
 240                         | sed 1q ) 2>/dev/null`
 241                   if test -n "$ver" && test -f "$dir/$libname$shrext.$ver"; then
 242                     found_dir="$dir"
 243                     found_so="$dir/$libname$shrext.$ver"
 244                   fi
 245                 else
 246                   eval library_names=\"$acl_library_names_spec\"
 247                   for f in $library_names; do
 248                     if test -f "$dir/$f"; then
 249                       found_dir="$dir"
 250                       found_so="$dir/$f"
 251                       break
 252                     fi
 253                   done
 254                 fi
 255               fi
 256             fi
 257             dnl Then look for a static library.
 258             if test "X$found_dir" = "X"; then
 259               if test -f "$dir/$libname.$acl_libext"; then
 260                 found_dir="$dir"
 261                 found_a="$dir/$libname.$acl_libext"
 262               fi
 263             fi
 264             if test "X$found_dir" != "X"; then
 265               if test -f "$dir/$libname.la"; then
 266                 found_la="$dir/$libname.la"
 267               fi
 268             fi
 269           fi
 270           if test "X$found_dir" = "X"; then
 271             for x in $LDFLAGS $LTLIB[]NAME; do
 272               AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 273               case "$x" in
 274                 -L*)
 275                   dir=`echo "X$x" | sed -e 's/^X-L//'`
 276                   dnl First look for a shared library.
 277                   if test -n "$acl_shlibext"; then
 278                     if test -f "$dir/$libname$shrext"; then
 279                       found_dir="$dir"
 280                       found_so="$dir/$libname$shrext"
 281                     else
 282                       if test "$acl_library_names_spec" = '$libname$shrext$versuffix'; then
 283                         ver=`(cd "$dir" && \
 284                               for f in "$libname$shrext".*; do echo "$f"; done \
 285                               | sed -e "s,^$libname$shrext\\\\.,," \
 286                               | sort -t '.' -n -r -k1,1 -k2,2 -k3,3 -k4,4 -k5,5 \
 287                               | sed 1q ) 2>/dev/null`
 288                         if test -n "$ver" && test -f "$dir/$libname$shrext.$ver"; then
 289                           found_dir="$dir"
 290                           found_so="$dir/$libname$shrext.$ver"
 291                         fi
 292                       else
 293                         eval library_names=\"$acl_library_names_spec\"
 294                         for f in $library_names; do
 295                           if test -f "$dir/$f"; then
 296                             found_dir="$dir"
 297                             found_so="$dir/$f"
 298                             break
 299                           fi
 300                         done
 301                       fi
 302                     fi
 303                   fi
 304                   dnl Then look for a static library.
 305                   if test "X$found_dir" = "X"; then
 306                     if test -f "$dir/$libname.$acl_libext"; then
 307                       found_dir="$dir"
 308                       found_a="$dir/$libname.$acl_libext"
 309                     fi
 310                   fi
 311                   if test "X$found_dir" != "X"; then
 312                     if test -f "$dir/$libname.la"; then
 313                       found_la="$dir/$libname.la"
 314                     fi
 315                   fi
 316                   ;;
 317               esac
 318               if test "X$found_dir" != "X"; then
 319                 break
 320               fi
 321             done
 322           fi
 323           if test "X$found_dir" != "X"; then
 324             dnl Found the library.
 325             LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$found_dir -l$name"
 326             if test "X$found_so" != "X"; then
 327               dnl Linking with a shared library. We attempt to hardcode its
 328               dnl directory into the executable's runpath, unless it's the
 329               dnl standard /usr/lib.
 330               if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/$acl_libdirstem"; then
 331                 dnl No hardcoding is needed.
 332                 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 333               else
 334                 dnl Use an explicit option to hardcode DIR into the resulting
 335                 dnl binary.
 336                 dnl Potentially add DIR to ltrpathdirs.
 337                 dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
 338                 haveit=
 339                 for x in $ltrpathdirs; do
 340                   if test "X$x" = "X$found_dir"; then
 341                     haveit=yes
 342                     break
 343                   fi
 344                 done
 345                 if test -z "$haveit"; then
 346                   ltrpathdirs="$ltrpathdirs $found_dir"
 347                 fi
 348                 dnl The hardcoding into $LIBNAME is system dependent.
 349                 if test "$acl_hardcode_direct" = yes; then
 350                   dnl Using DIR/libNAME.so during linking hardcodes DIR into the
 351                   dnl resulting binary.
 352                   LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 353                 else
 354                   if test -n "$acl_hardcode_libdir_flag_spec" && test "$acl_hardcode_minus_L" = no; then
 355                     dnl Use an explicit option to hardcode DIR into the resulting
 356                     dnl binary.
 357                     LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 358                     dnl Potentially add DIR to rpathdirs.
 359                     dnl The rpathdirs will be appended to $LIBNAME at the end.
 360                     haveit=
 361                     for x in $rpathdirs; do
 362                       if test "X$x" = "X$found_dir"; then
 363                         haveit=yes
 364                         break
 365                       fi
 366                     done
 367                     if test -z "$haveit"; then
 368                       rpathdirs="$rpathdirs $found_dir"
 369                     fi
 370                   else
 371                     dnl Rely on "-L$found_dir".
 372                     dnl But don't add it if it's already contained in the LDFLAGS
 373                     dnl or the already constructed $LIBNAME
 374                     haveit=
 375                     for x in $LDFLAGS $LIB[]NAME; do
 376                       AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 377                       if test "X$x" = "X-L$found_dir"; then
 378                         haveit=yes
 379                         break
 380                       fi
 381                     done
 382                     if test -z "$haveit"; then
 383                       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir"
 384                     fi
 385                     if test "$acl_hardcode_minus_L" != no; then
 386                       dnl FIXME: Not sure whether we should use
 387                       dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
 388                       dnl here.
 389                       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 390                     else
 391                       dnl We cannot use $acl_hardcode_runpath_var and LD_RUN_PATH
 392                       dnl here, because this doesn't fit in flags passed to the
 393                       dnl compiler. So give up. No hardcoding. This affects only
 394                       dnl very old systems.
 395                       dnl FIXME: Not sure whether we should use
 396                       dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
 397                       dnl here.
 398                       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
 399                     fi
 400                   fi
 401                 fi
 402               fi
 403             else
 404               if test "X$found_a" != "X"; then
 405                 dnl Linking with a static library.
 406                 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_a"
 407               else
 408                 dnl We shouldn't come here, but anyway it's good to have a
 409                 dnl fallback.
 410                 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir -l$name"
 411               fi
 412             fi
 413             dnl Assume the include files are nearby.
 414             additional_includedir=
 415             case "$found_dir" in
 416               */$acl_libdirstem | */$acl_libdirstem/)
 417                 basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e "s,/$acl_libdirstem/"'*$,,'`
 418                 LIB[]NAME[]_PREFIX="$basedir"
 419                 additional_includedir="$basedir/include"
 420                 ;;
 421             esac
 422             if test "X$additional_includedir" != "X"; then
 423               dnl Potentially add $additional_includedir to $INCNAME.
 424               dnl But don't add it
 425               dnl   1. if it's the standard /usr/include,
 426               dnl   2. if it's /usr/local/include and we are using GCC on Linux,
 427               dnl   3. if it's already present in $CPPFLAGS or the already
 428               dnl      constructed $INCNAME,
 429               dnl   4. if it doesn't exist as a directory.
 430               if test "X$additional_includedir" != "X/usr/include"; then
 431                 haveit=
 432                 if test "X$additional_includedir" = "X/usr/local/include"; then
 433                   if test -n "$GCC"; then
 434                     case $host_os in
 435                       linux* | gnu* | k*bsd*-gnu) haveit=yes;;
 436                     esac
 437                   fi
 438                 fi
 439                 if test -z "$haveit"; then
 440                   for x in $CPPFLAGS $INC[]NAME; do
 441                     AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 442                     if test "X$x" = "X-I$additional_includedir"; then
 443                       haveit=yes
 444                       break
 445                     fi
 446                   done
 447                   if test -z "$haveit"; then
 448                     if test -d "$additional_includedir"; then
 449                       dnl Really add $additional_includedir to $INCNAME.
 450                       INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir"
 451                     fi
 452                   fi
 453                 fi
 454               fi
 455             fi
 456             dnl Look for dependencies.
 457             if test -n "$found_la"; then
 458               dnl Read the .la file. It defines the variables
 459               dnl dlname, library_names, old_library, dependency_libs, current,
 460               dnl age, revision, installed, dlopen, dlpreopen, libdir.
 461               save_libdir="$libdir"
 462               case "$found_la" in
 463                 */* | *\\*) . "$found_la" ;;
 464                 *) . "./$found_la" ;;
 465               esac
 466               libdir="$save_libdir"
 467               dnl We use only dependency_libs.
 468               for dep in $dependency_libs; do
 469                 case "$dep" in
 470                   -L*)
 471                     additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'`
 472                     dnl Potentially add $additional_libdir to $LIBNAME and $LTLIBNAME.
 473                     dnl But don't add it
 474                     dnl   1. if it's the standard /usr/lib,
 475                     dnl   2. if it's /usr/local/lib and we are using GCC on Linux,
 476                     dnl   3. if it's already present in $LDFLAGS or the already
 477                     dnl      constructed $LIBNAME,
 478                     dnl   4. if it doesn't exist as a directory.
 479                     if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then
 480                       haveit=
 481                       if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then
 482                         if test -n "$GCC"; then
 483                           case $host_os in
 484                             linux* | gnu* | k*bsd*-gnu) haveit=yes;;
 485                           esac
 486                         fi
 487                       fi
 488                       if test -z "$haveit"; then
 489                         haveit=
 490                         for x in $LDFLAGS $LIB[]NAME; do
 491                           AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 492                           if test "X$x" = "X-L$additional_libdir"; then
 493                             haveit=yes
 494                             break
 495                           fi
 496                         done
 497                         if test -z "$haveit"; then
 498                           if test -d "$additional_libdir"; then
 499                             dnl Really add $additional_libdir to $LIBNAME.
 500                             LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$additional_libdir"
 501                           fi
 502                         fi
 503                         haveit=
 504                         for x in $LDFLAGS $LTLIB[]NAME; do
 505                           AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 506                           if test "X$x" = "X-L$additional_libdir"; then
 507                             haveit=yes
 508                             break
 509                           fi
 510                         done
 511                         if test -z "$haveit"; then
 512                           if test -d "$additional_libdir"; then
 513                             dnl Really add $additional_libdir to $LTLIBNAME.
 514                             LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$additional_libdir"
 515                           fi
 516                         fi
 517                       fi
 518                     fi
 519                     ;;
 520                   -R*)
 521                     dir=`echo "X$dep" | sed -e 's/^X-R//'`
 522                     if test "$enable_rpath" != no; then
 523                       dnl Potentially add DIR to rpathdirs.
 524                       dnl The rpathdirs will be appended to $LIBNAME at the end.
 525                       haveit=
 526                       for x in $rpathdirs; do
 527                         if test "X$x" = "X$dir"; then
 528                           haveit=yes
 529                           break
 530                         fi
 531                       done
 532                       if test -z "$haveit"; then
 533                         rpathdirs="$rpathdirs $dir"
 534                       fi
 535                       dnl Potentially add DIR to ltrpathdirs.
 536                       dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
 537                       haveit=
 538                       for x in $ltrpathdirs; do
 539                         if test "X$x" = "X$dir"; then
 540                           haveit=yes
 541                           break
 542                         fi
 543                       done
 544                       if test -z "$haveit"; then
 545                         ltrpathdirs="$ltrpathdirs $dir"
 546                       fi
 547                     fi
 548                     ;;
 549                   -l*)
 550                     dnl Handle this in the next round.
 551                     names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'`
 552                     ;;
 553                   *.la)
 554                     dnl Handle this in the next round. Throw away the .la's
 555                     dnl directory; it is already contained in a preceding -L
 556                     dnl option.
 557                     names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'`
 558                     ;;
 559                   *)
 560                     dnl Most likely an immediate library name.
 561                     LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$dep"
 562                     LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$dep"
 563                     ;;
 564                 esac
 565               done
 566             fi
 567           else
 568             dnl Didn't find the library; assume it is in the system directories
 569             dnl known to the linker and runtime loader. (All the system
 570             dnl directories known to the linker should also be known to the
 571             dnl runtime loader, otherwise the system is severely misconfigured.)
 572             LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
 573             LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l$name"
 574           fi
 575         fi
 576       fi
 577     done
 578   done
 579   if test "X$rpathdirs" != "X"; then
 580     if test -n "$acl_hardcode_libdir_separator"; then
 581       dnl Weird platform: only the last -rpath option counts, the user must
 582       dnl pass all path elements in one option. We can arrange that for a
 583       dnl single library, but not when more than one $LIBNAMEs are used.
 584       alldirs=
 585       for found_dir in $rpathdirs; do
 586         alldirs="${alldirs}${alldirs:+$acl_hardcode_libdir_separator}$found_dir"
 587       done
 588       dnl Note: acl_hardcode_libdir_flag_spec uses $libdir and $wl.
 589       acl_save_libdir="$libdir"
 590       libdir="$alldirs"
 591       eval flag=\"$acl_hardcode_libdir_flag_spec\"
 592       libdir="$acl_save_libdir"
 593       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
 594     else
 595       dnl The -rpath options are cumulative.
 596       for found_dir in $rpathdirs; do
 597         acl_save_libdir="$libdir"
 598         libdir="$found_dir"
 599         eval flag=\"$acl_hardcode_libdir_flag_spec\"
 600         libdir="$acl_save_libdir"
 601         LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
 602       done
 603     fi
 604   fi
 605   if test "X$ltrpathdirs" != "X"; then
 606     dnl When using libtool, the option that works for both libraries and
 607     dnl executables is -R. The -R options are cumulative.
 608     for found_dir in $ltrpathdirs; do
 609       LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-R$found_dir"
 610     done
 611   fi
 612 ])
 613
 614 dnl AC_LIB_APPENDTOVAR(VAR, CONTENTS) appends the elements of CONTENTS to VAR,
 615 dnl unless already present in VAR.
 616 dnl Works only for CPPFLAGS, not for LIB* variables because that sometimes
 617 dnl contains two or three consecutive elements that belong together.
 618 AC_DEFUN([AC_LIB_APPENDTOVAR],
 619 [
 620   for element in [$2]; do
 621     haveit=
 622     for x in $[$1]; do
 623       AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 624       if test "X$x" = "X$element"; then
 625         haveit=yes
 626         break
 627       fi
 628     done
 629     if test -z "$haveit"; then
 630       [$1]="${[$1]}${[$1]:+ }$element"
 631     fi
 632   done
 633 ])
 634
 635 dnl For those cases where a variable contains several -L and -l options
 636 dnl referring to unknown libraries and directories, this macro determines the
 637 dnl necessary additional linker options for the runtime path.
 638 dnl AC_LIB_LINKFLAGS_FROM_LIBS([LDADDVAR], [LIBSVALUE], [USE-LIBTOOL])
 639 dnl sets LDADDVAR to linker options needed together with LIBSVALUE.
 640 dnl If USE-LIBTOOL evaluates to non-empty, linking with libtool is assumed,
 641 dnl otherwise linking without libtool is assumed.
 642 AC_DEFUN([AC_LIB_LINKFLAGS_FROM_LIBS],
 643 [
 644   AC_REQUIRE([AC_LIB_RPATH])
 645   AC_REQUIRE([AC_LIB_PREPARE_MULTILIB])
 646   $1=
 647   if test "$enable_rpath" != no; then
 648     if test -n "$acl_hardcode_libdir_flag_spec" && test "$acl_hardcode_minus_L" = no; then
 649       dnl Use an explicit option to hardcode directories into the resulting
 650       dnl binary.
 651       rpathdirs=
 652       next=
 653       for opt in $2; do
 654         if test -n "$next"; then
 655           dir="$next"
 656           dnl No need to hardcode the standard /usr/lib.
 657           if test "X$dir" != "X/usr/$acl_libdirstem"; then
 658             rpathdirs="$rpathdirs $dir"
 659           fi
 660           next=
 661         else
 662           case $opt in
 663             -L) next=yes ;;
 664             -L*) dir=`echo "X$opt" | sed -e 's,^X-L,,'`
 665                  dnl No need to hardcode the standard /usr/lib.
 666                  if test "X$dir" != "X/usr/$acl_libdirstem"; then
 667                    rpathdirs="$rpathdirs $dir"
 668                  fi
 669                  next= ;;
 670             *) next= ;;
 671           esac
 672         fi
 673       done
 674       if test "X$rpathdirs" != "X"; then
 675         if test -n ""$3""; then
 676           dnl libtool is used for linking. Use -R options.
 677           for dir in $rpathdirs; do
 678             $1="${$1}${$1:+ }-R$dir"
 679           done
 680         else
 681           dnl The linker is used for linking directly.
 682           if test -n "$acl_hardcode_libdir_separator"; then
 683             dnl Weird platform: only the last -rpath option counts, the user
 684             dnl must pass all path elements in one option.
 685             alldirs=
 686             for dir in $rpathdirs; do
 687               alldirs="${alldirs}${alldirs:+$acl_hardcode_libdir_separator}$dir"
 688             done
 689             acl_save_libdir="$libdir"
 690             libdir="$alldirs"
 691             eval flag=\"$acl_hardcode_libdir_flag_spec\"
 692             libdir="$acl_save_libdir"
 693             $1="$flag"
 694           else
 695             dnl The -rpath options are cumulative.
 696             for dir in $rpathdirs; do
 697               acl_save_libdir="$libdir"
 698               libdir="$dir"
 699               eval flag=\"$acl_hardcode_libdir_flag_spec\"
 700               libdir="$acl_save_libdir"
 701               $1="${$1}${$1:+ }$flag"
 702             done
 703           fi
 704         fi
 705       fi
 706     fi
 707   fi
 708   AC_SUBST([$1])
 709 ])