sdcc/support/cpp/config/lib-link.m4

   1 # lib-link.m4 serial 4 (gettext-0.12)
   2 dnl Copyright (C) 2001-2003 Free Software Foundation, Inc.
   3 dnl This file is free software, distributed under the terms of the GNU
   4 dnl General Public License.  As a special exception to the GNU General
   5 dnl Public License, this file may be distributed as part of a program
   6 dnl that contains a configuration script generated by Autoconf, under
   7 dnl the same distribution terms as the rest of that program.
   8
   9 dnl From Bruno Haible.
  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 AC_DEFUN([AC_LIB_LINKFLAGS],
  16 [
  17   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  18   AC_REQUIRE([AC_LIB_RPATH])
  19   define([Name],[translit([$1],[./-], [___])])
  20   define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
  21                                [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
  22   AC_CACHE_CHECK([how to link with lib[]$1], [ac_cv_lib[]Name[]_libs], [
  23     AC_LIB_LINKFLAGS_BODY([$1], [$2])
  24     ac_cv_lib[]Name[]_libs="$LIB[]NAME"
  25     ac_cv_lib[]Name[]_ltlibs="$LTLIB[]NAME"
  26     ac_cv_lib[]Name[]_cppflags="$INC[]NAME"
  27   ])
  28   LIB[]NAME="$ac_cv_lib[]Name[]_libs"
  29   LTLIB[]NAME="$ac_cv_lib[]Name[]_ltlibs"
  30   INC[]NAME="$ac_cv_lib[]Name[]_cppflags"
  31   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
  32   AC_SUBST([LIB]NAME)
  33   AC_SUBST([LTLIB]NAME)
  34   dnl Also set HAVE_LIB[]NAME so that AC_LIB_HAVE_LINKFLAGS can reuse the
  35   dnl results of this search when this library appears as a dependency.
  36   HAVE_LIB[]NAME=yes
  37   undefine([Name])
  38   undefine([NAME])
  39 ])
  40
  41 dnl AC_LIB_HAVE_LINKFLAGS(name, dependencies, includes, testcode)
  42 dnl searches for libname and the libraries corresponding to explicit and
  43 dnl implicit dependencies, together with the specified include files and
  44 dnl the ability to compile and link the specified testcode. If found, it
  45 dnl sets and AC_SUBSTs HAVE_LIB${NAME}=yes and the LIB${NAME} and
  46 dnl LTLIB${NAME} variables and augments the CPPFLAGS variable, and
  47 dnl #defines HAVE_LIB${NAME} to 1. Otherwise, it sets and AC_SUBSTs
  48 dnl HAVE_LIB${NAME}=no and LIB${NAME} and LTLIB${NAME} to empty.
  49 AC_DEFUN([AC_LIB_HAVE_LINKFLAGS],
  50 [
  51   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  52   AC_REQUIRE([AC_LIB_RPATH])
  53   define([Name],[translit([$1],[./-], [___])])
  54   define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
  55                                [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
  56
  57   dnl Search for lib[]Name and define LIB[]NAME, LTLIB[]NAME and INC[]NAME
  58   dnl accordingly.
  59   AC_LIB_LINKFLAGS_BODY([$1], [$2])
  60
  61   dnl Add $INC[]NAME to CPPFLAGS before performing the following checks,
  62   dnl because if the user has installed lib[]Name and not disabled its use
  63   dnl via --without-lib[]Name-prefix, he wants to use it.
  64   ac_save_CPPFLAGS="$CPPFLAGS"
  65   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
  66
  67   AC_CACHE_CHECK([for lib[]$1], [ac_cv_lib[]Name], [
  68     ac_save_LIBS="$LIBS"
  69     LIBS="$LIBS $LIB[]NAME"
  70     AC_TRY_LINK([$3], [$4], [ac_cv_lib[]Name=yes], [ac_cv_lib[]Name=no])
  71     LIBS="$ac_save_LIBS"
  72   ])
  73   if test "$ac_cv_lib[]Name" = yes; then
  74     HAVE_LIB[]NAME=yes
  75     AC_DEFINE([HAVE_LIB]NAME, 1, [Define if you have the $1 library.])
  76     AC_MSG_CHECKING([how to link with lib[]$1])
  77     AC_MSG_RESULT([$LIB[]NAME])
  78   else
  79     HAVE_LIB[]NAME=no
  80     dnl If $LIB[]NAME didn't lead to a usable library, we don't need
  81     dnl $INC[]NAME either.
  82     CPPFLAGS="$ac_save_CPPFLAGS"
  83     LIB[]NAME=
  84     LTLIB[]NAME=
  85   fi
  86   AC_SUBST([HAVE_LIB]NAME)
  87   AC_SUBST([LIB]NAME)
  88   AC_SUBST([LTLIB]NAME)
  89   undefine([Name])
  90   undefine([NAME])
  91 ])
  92
  93 dnl Determine the platform dependent parameters needed to use rpath:
  94 dnl libext, shlibext, hardcode_libdir_flag_spec, hardcode_libdir_separator,
  95 dnl hardcode_direct, hardcode_minus_L.
  96 AC_DEFUN([AC_LIB_RPATH],
  97 [
  98   AC_REQUIRE([AC_PROG_CC])                dnl we use $CC, $GCC, $LDFLAGS
  99   AC_REQUIRE([AC_LIB_PROG_LD])            dnl we use $LD, $with_gnu_ld
 100   AC_REQUIRE([AC_CANONICAL_HOST])         dnl we use $host
 101   AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
 102   AC_CACHE_CHECK([for shared library run path origin], acl_cv_rpath, [
 103     CC="$CC" GCC="$GCC" LDFLAGS="$LDFLAGS" LD="$LD" with_gnu_ld="$with_gnu_ld" \
 104     ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.rpath" "$host" > conftest.sh
 105     . ./conftest.sh
 106     rm -f ./conftest.sh
 107     acl_cv_rpath=done
 108   ])
 109   wl="$acl_cv_wl"
 110   libext="$acl_cv_libext"
 111   shlibext="$acl_cv_shlibext"
 112   hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec"
 113   hardcode_libdir_separator="$acl_cv_hardcode_libdir_separator"
 114   hardcode_direct="$acl_cv_hardcode_direct"
 115   hardcode_minus_L="$acl_cv_hardcode_minus_L"
 116   dnl Determine whether the user wants rpath handling at all.
 117   AC_ARG_ENABLE(rpath,
 118     [  --disable-rpath         do not hardcode runtime library paths],
 119     :, enable_rpath=yes)
 120 ])
 121
 122 dnl AC_LIB_LINKFLAGS_BODY(name [, dependencies]) searches for libname and
 123 dnl the libraries corresponding to explicit and implicit dependencies.
 124 dnl Sets the LIB${NAME}, LTLIB${NAME} and INC${NAME} variables.
 125 AC_DEFUN([AC_LIB_LINKFLAGS_BODY],
 126 [
 127   define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
 128                                [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
 129   dnl By default, look in $includedir and $libdir.
 130   use_additional=yes
 131   AC_LIB_WITH_FINAL_PREFIX([
 132     eval additional_includedir=\"$includedir\"
 133     eval additional_libdir=\"$libdir\"
 134   ])
 135   AC_LIB_ARG_WITH([lib$1-prefix],
 136 [  --with-lib$1-prefix[=DIR]  search for lib$1 in DIR/include and DIR/lib
 137   --without-lib$1-prefix     don't search for lib$1 in includedir and libdir],
 138 [
 139     if test "X$withval" = "Xno"; then
 140       use_additional=no
 141     else
 142       if test "X$withval" = "X"; then
 143         AC_LIB_WITH_FINAL_PREFIX([
 144           eval additional_includedir=\"$includedir\"
 145           eval additional_libdir=\"$libdir\"
 146         ])
 147       else
 148         additional_includedir="$withval/include"
 149         additional_libdir="$withval/lib"
 150       fi
 151     fi
 152 ])
 153   AC_LIB_ARG_WITH([lib$1-type],
 154 [  --with-lib$1-type=TYPE     type of library to search for (auto/static/shared) ],
 155   [ with_lib$1_type=$withval ], [ with_lib$1_type=auto ])
 156   lib_type=`eval echo \$with_lib$1_type`
 157
 158   dnl Search the library and its dependencies in $additional_libdir and
 159   dnl $LDFLAGS. Using breadth-first-seach.
 160   LIB[]NAME=
 161   LTLIB[]NAME=
 162   INC[]NAME=
 163   rpathdirs=
 164   ltrpathdirs=
 165   names_already_handled=
 166   names_next_round='$1 $2'
 167   while test -n "$names_next_round"; do
 168     names_this_round="$names_next_round"
 169     names_next_round=
 170     for name in $names_this_round; do
 171       already_handled=
 172       for n in $names_already_handled; do
 173         if test "$n" = "$name"; then
 174           already_handled=yes
 175           break
 176         fi
 177       done
 178       if test -z "$already_handled"; then
 179         names_already_handled="$names_already_handled $name"
 180         dnl See if it was already located by an earlier AC_LIB_LINKFLAGS
 181         dnl or AC_LIB_HAVE_LINKFLAGS call.
 182         uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'`
 183         eval value=\"\$HAVE_LIB$uppername\"
 184         if test -n "$value"; then
 185           if test "$value" = yes; then
 186             eval value=\"\$LIB$uppername\"
 187             test -z "$value" || LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$value"
 188             eval value=\"\$LTLIB$uppername\"
 189             test -z "$value" || LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$value"
 190           else
 191             dnl An earlier call to AC_LIB_HAVE_LINKFLAGS has determined
 192             dnl that this library doesn't exist. So just drop it.
 193             :
 194           fi
 195         else
 196           dnl Search the library lib$name in $additional_libdir and $LDFLAGS
 197           dnl and the already constructed $LIBNAME/$LTLIBNAME.
 198           found_dir=
 199           found_la=
 200           found_so=
 201           found_a=
 202           if test $use_additional = yes; then
 203             if test -n "$shlibext" && test -f "$additional_libdir/lib$name.$shlibext" && test x$lib_type != xstatic; then
 204               found_dir="$additional_libdir"
 205               found_so="$additional_libdir/lib$name.$shlibext"
 206               if test -f "$additional_libdir/lib$name.la"; then
 207                 found_la="$additional_libdir/lib$name.la"
 208               fi
 209             elif test x$lib_type != xshared; then
 210               if test -f "$additional_libdir/lib$name.$libext"; then
 211                 found_dir="$additional_libdir"
 212                 found_a="$additional_libdir/lib$name.$libext"
 213                 if test -f "$additional_libdir/lib$name.la"; then
 214                   found_la="$additional_libdir/lib$name.la"
 215                 fi
 216               fi
 217             fi
 218           fi
 219           if test "X$found_dir" = "X"; then
 220             for x in $LDFLAGS $LTLIB[]NAME; do
 221               AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 222               case "$x" in
 223                 -L*)
 224                   dir=`echo "X$x" | sed -e 's/^X-L//'`
 225                   if test -n "$shlibext" && test -f "$dir/lib$name.$shlibext" && test x$lib_type != xstatic; then
 226                     found_dir="$dir"
 227                     found_so="$dir/lib$name.$shlibext"
 228                     if test -f "$dir/lib$name.la"; then
 229                       found_la="$dir/lib$name.la"
 230                     fi
 231                   elif test x$lib_type != xshared; then
 232                     if test -f "$dir/lib$name.$libext"; then
 233                       found_dir="$dir"
 234                       found_a="$dir/lib$name.$libext"
 235                       if test -f "$dir/lib$name.la"; then
 236                         found_la="$dir/lib$name.la"
 237                       fi
 238                     fi
 239                   fi
 240                   ;;
 241               esac
 242               if test "X$found_dir" != "X"; then
 243                 break
 244               fi
 245             done
 246           fi
 247           if test "X$found_dir" != "X"; then
 248             dnl Found the library.
 249             LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$found_dir -l$name"
 250             if test "X$found_so" != "X"; then
 251               dnl Linking with a shared library. We attempt to hardcode its
 252               dnl directory into the executable's runpath, unless it's the
 253               dnl standard /usr/lib.
 254               if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/lib"; then
 255                 dnl No hardcoding is needed.
 256                 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 257               else
 258                 dnl Use an explicit option to hardcode DIR into the resulting
 259                 dnl binary.
 260                 dnl Potentially add DIR to ltrpathdirs.
 261                 dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
 262                 haveit=
 263                 for x in $ltrpathdirs; do
 264                   if test "X$x" = "X$found_dir"; then
 265                     haveit=yes
 266                     break
 267                   fi
 268                 done
 269                 if test -z "$haveit"; then
 270                   ltrpathdirs="$ltrpathdirs $found_dir"
 271                 fi
 272                 dnl The hardcoding into $LIBNAME is system dependent.
 273                 if test "$hardcode_direct" = yes; then
 274                   dnl Using DIR/libNAME.so during linking hardcodes DIR into the
 275                   dnl resulting binary.
 276                   LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 277                 else
 278                   if test -n "$hardcode_libdir_flag_spec" && test "$hardcode_minus_L" = no; then
 279                     dnl Use an explicit option to hardcode DIR into the resulting
 280                     dnl binary.
 281                     LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 282                     dnl Potentially add DIR to rpathdirs.
 283                     dnl The rpathdirs will be appended to $LIBNAME at the end.
 284                     haveit=
 285                     for x in $rpathdirs; do
 286                       if test "X$x" = "X$found_dir"; then
 287                         haveit=yes
 288                         break
 289                       fi
 290                     done
 291                     if test -z "$haveit"; then
 292                       rpathdirs="$rpathdirs $found_dir"
 293                     fi
 294                   else
 295                     dnl Rely on "-L$found_dir".
 296                     dnl But don't add it if it's already contained in the LDFLAGS
 297                     dnl or the already constructed $LIBNAME
 298                     haveit=
 299                     for x in $LDFLAGS $LIB[]NAME; do
 300                       AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 301                       if test "X$x" = "X-L$found_dir"; then
 302                         haveit=yes
 303                         break
 304                       fi
 305                     done
 306                     if test -z "$haveit"; then
 307                       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir"
 308                     fi
 309                     if test "$hardcode_minus_L" != no; then
 310                       dnl FIXME: Not sure whether we should use
 311                       dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
 312                       dnl here.
 313                       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
 314                     else
 315                       dnl We cannot use $hardcode_runpath_var and LD_RUN_PATH
 316                       dnl here, because this doesn't fit in flags passed to the
 317                       dnl compiler. So give up. No hardcoding. This affects only
 318                       dnl very old systems.
 319                       dnl FIXME: Not sure whether we should use
 320                       dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
 321                       dnl here.
 322                       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
 323                     fi
 324                   fi
 325                 fi
 326               fi
 327             else
 328               if test "X$found_a" != "X"; then
 329                 dnl Linking with a static library.
 330                 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_a"
 331               else
 332                 dnl We shouldn't come here, but anyway it's good to have a
 333                 dnl fallback.
 334                 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir -l$name"
 335               fi
 336             fi
 337             dnl Assume the include files are nearby.
 338             additional_includedir=
 339             case "$found_dir" in
 340               */lib | */lib/)
 341                 basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e 's,/lib/*$,,'`
 342                 additional_includedir="$basedir/include"
 343                 ;;
 344             esac
 345             if test "X$additional_includedir" != "X"; then
 346               dnl Potentially add $additional_includedir to $INCNAME.
 347               dnl But don't add it
 348               dnl   1. if it's the standard /usr/include,
 349               dnl   2. if it's /usr/local/include and we are using GCC on Linux,
 350               dnl   3. if it's already present in $CPPFLAGS or the already
 351               dnl      constructed $INCNAME,
 352               dnl   4. if it doesn't exist as a directory.
 353               if test "X$additional_includedir" != "X/usr/include"; then
 354                 haveit=
 355                 if test "X$additional_includedir" = "X/usr/local/include"; then
 356                   if test -n "$GCC"; then
 357                     case $host_os in
 358                       linux*) haveit=yes;;
 359                     esac
 360                   fi
 361                 fi
 362                 if test -z "$haveit"; then
 363                   for x in $CPPFLAGS $INC[]NAME; do
 364                     AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 365                     if test "X$x" = "X-I$additional_includedir"; then
 366                       haveit=yes
 367                       break
 368                     fi
 369                   done
 370                   if test -z "$haveit"; then
 371                     if test -d "$additional_includedir"; then
 372                       dnl Really add $additional_includedir to $INCNAME.
 373                       INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir"
 374                     fi
 375                   fi
 376                 fi
 377               fi
 378             fi
 379             dnl Look for dependencies.
 380             if test -n "$found_la"; then
 381               dnl Read the .la file. It defines the variables
 382               dnl dlname, library_names, old_library, dependency_libs, current,
 383               dnl age, revision, installed, dlopen, dlpreopen, libdir.
 384               save_libdir="$libdir"
 385               case "$found_la" in
 386                 */* | *\\*) . "$found_la" ;;
 387                 *) . "./$found_la" ;;
 388               esac
 389               libdir="$save_libdir"
 390               dnl We use only dependency_libs.
 391               for dep in $dependency_libs; do
 392                 case "$dep" in
 393                   -L*)
 394                     additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'`
 395                     dnl Potentially add $additional_libdir to $LIBNAME and $LTLIBNAME.
 396                     dnl But don't add it
 397                     dnl   1. if it's the standard /usr/lib,
 398                     dnl   2. if it's /usr/local/lib and we are using GCC on Linux,
 399                     dnl   3. if it's already present in $LDFLAGS or the already
 400                     dnl      constructed $LIBNAME,
 401                     dnl   4. if it doesn't exist as a directory.
 402                     if test "X$additional_libdir" != "X/usr/lib"; then
 403                       haveit=
 404                       if test "X$additional_libdir" = "X/usr/local/lib"; then
 405                         if test -n "$GCC"; then
 406                           case $host_os in
 407                             linux*) haveit=yes;;
 408                           esac
 409                         fi
 410                       fi
 411                       if test -z "$haveit"; then
 412                         haveit=
 413                         for x in $LDFLAGS $LIB[]NAME; do
 414                           AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 415                           if test "X$x" = "X-L$additional_libdir"; then
 416                             haveit=yes
 417                             break
 418                           fi
 419                         done
 420                         if test -z "$haveit"; then
 421                           if test -d "$additional_libdir"; then
 422                             dnl Really add $additional_libdir to $LIBNAME.
 423                             LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$additional_libdir"
 424                           fi
 425                         fi
 426                         haveit=
 427                         for x in $LDFLAGS $LTLIB[]NAME; do
 428                           AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 429                           if test "X$x" = "X-L$additional_libdir"; then
 430                             haveit=yes
 431                             break
 432                           fi
 433                         done
 434                         if test -z "$haveit"; then
 435                           if test -d "$additional_libdir"; then
 436                             dnl Really add $additional_libdir to $LTLIBNAME.
 437                             LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$additional_libdir"
 438                           fi
 439                         fi
 440                       fi
 441                     fi
 442                     ;;
 443                   -R*)
 444                     dir=`echo "X$dep" | sed -e 's/^X-R//'`
 445                     if test "$enable_rpath" != no; then
 446                       dnl Potentially add DIR to rpathdirs.
 447                       dnl The rpathdirs will be appended to $LIBNAME at the end.
 448                       haveit=
 449                       for x in $rpathdirs; do
 450                         if test "X$x" = "X$dir"; then
 451                           haveit=yes
 452                           break
 453                         fi
 454                       done
 455                       if test -z "$haveit"; then
 456                         rpathdirs="$rpathdirs $dir"
 457                       fi
 458                       dnl Potentially add DIR to ltrpathdirs.
 459                       dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
 460                       haveit=
 461                       for x in $ltrpathdirs; do
 462                         if test "X$x" = "X$dir"; then
 463                           haveit=yes
 464                           break
 465                         fi
 466                       done
 467                       if test -z "$haveit"; then
 468                         ltrpathdirs="$ltrpathdirs $dir"
 469                       fi
 470                     fi
 471                     ;;
 472                   -l*)
 473                     dnl Handle this in the next round.
 474                     names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'`
 475                     ;;
 476                   *.la)
 477                     dnl Handle this in the next round. Throw away the .la's
 478                     dnl directory; it is already contained in a preceding -L
 479                     dnl option.
 480                     names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'`
 481                     ;;
 482                   *)
 483                     dnl Most likely an immediate library name.
 484                     LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$dep"
 485                     LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$dep"
 486                     ;;
 487                 esac
 488               done
 489             fi
 490           else
 491             dnl Didn't find the library; assume it is in the system directories
 492             dnl known to the linker and runtime loader. (All the system
 493             dnl directories known to the linker should also be known to the
 494             dnl runtime loader, otherwise the system is severely misconfigured.)
 495             if test "x$lib_type" = "xauto" || test "x$lib_type" = "xshared"; then
 496               LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
 497               LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l$name"
 498             else
 499               LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l:lib$name.$libext"
 500               LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l:lib$name.$libext"
 501             fi
 502           fi
 503         fi
 504       fi
 505     done
 506   done
 507   if test "X$rpathdirs" != "X"; then
 508     if test -n "$hardcode_libdir_separator"; then
 509       dnl Weird platform: only the last -rpath option counts, the user must
 510       dnl pass all path elements in one option. We can arrange that for a
 511       dnl single library, but not when more than one $LIBNAMEs are used.
 512       alldirs=
 513       for found_dir in $rpathdirs; do
 514         alldirs="${alldirs}${alldirs:+$hardcode_libdir_separator}$found_dir"
 515       done
 516       dnl Note: hardcode_libdir_flag_spec uses $libdir and $wl.
 517       acl_save_libdir="$libdir"
 518       libdir="$alldirs"
 519       eval flag=\"$hardcode_libdir_flag_spec\"
 520       libdir="$acl_save_libdir"
 521       LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
 522     else
 523       dnl The -rpath options are cumulative.
 524       for found_dir in $rpathdirs; do
 525         acl_save_libdir="$libdir"
 526         libdir="$found_dir"
 527         eval flag=\"$hardcode_libdir_flag_spec\"
 528         libdir="$acl_save_libdir"
 529         LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
 530       done
 531     fi
 532   fi
 533   if test "X$ltrpathdirs" != "X"; then
 534     dnl When using libtool, the option that works for both libraries and
 535     dnl executables is -R. The -R options are cumulative.
 536     for found_dir in $ltrpathdirs; do
 537       LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-R$found_dir"
 538     done
 539   fi
 540 ])
 541
 542 dnl AC_LIB_APPENDTOVAR(VAR, CONTENTS) appends the elements of CONTENTS to VAR,
 543 dnl unless already present in VAR.
 544 dnl Works only for CPPFLAGS, not for LIB* variables because that sometimes
 545 dnl contains two or three consecutive elements that belong together.
 546 AC_DEFUN([AC_LIB_APPENDTOVAR],
 547 [
 548   for element in [$2]; do
 549     haveit=
 550     for x in $[$1]; do
 551       AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
 552       if test "X$x" = "X$element"; then
 553         haveit=yes
 554         break
 555       fi
 556     done
 557     if test -z "$haveit"; then
 558       [$1]="${[$1]}${[$1]:+ }$element"
 559     fi
 560   done
 561 ])