config.rpath

   1 #! /bin/sh
   2 # Output a system dependent set of variables, describing how to set the
   3 # run time search path of shared libraries in an executable.
   4 #
   5 #   Copyright 1996-2006 Free Software Foundation, Inc.
   6 #   Taken from GNU libtool, 2001
   7 #   Originally by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996
   8 #
   9 #   This file is free software; the Free Software Foundation gives
  10 #   unlimited permission to copy and/or distribute it, with or without
  11 #   modifications, as long as this notice is preserved.
  12 #
  13 # The first argument passed to this file is the canonical host specification,
  14 #    CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM
  15 # or
  16 #    CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
  17 # The environment variables CC, GCC, LDFLAGS, LD, with_gnu_ld
  18 # should be set by the caller.
  19 #
  20 # The set of defined variables is at the end of this script.
  21
  22 # Known limitations:
  23 # - On IRIX 6.5 with CC="cc", the run time search patch must not be longer
  24 #   than 256 bytes, otherwise the compiler driver will dump core. The only
  25 #   known workaround is to choose shorter directory names for the build
  26 #   directory and/or the installation directory.
  27
  28 # All known linkers require a `.a' archive for static linking (except MSVC,
  29 # which needs '.lib').
  30 libext=a
  31 shrext=.so
  32
  33 host="$1"
  34 host_cpu=`echo "$host" | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
  35 host_vendor=`echo "$host" | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
  36 host_os=`echo "$host" | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
  37
  38 # Code taken from libtool.m4's _LT_CC_BASENAME.
  39
  40 for cc_temp in $CC""; do
  41   case $cc_temp in
  42     compile | *[\\/]compile | ccache | *[\\/]ccache ) ;;
  43     distcc | *[\\/]distcc | purify | *[\\/]purify ) ;;
  44     \-*) ;;
  45     *) break;;
  46   esac
  47 done
  48 cc_basename=`echo "$cc_temp" | sed -e 's%^.*/%%'`
  49
  50 # Code taken from libtool.m4's AC_LIBTOOL_PROG_COMPILER_PIC.
  51
  52 wl=
  53 if test "$GCC" = yes; then
  54   wl='-Wl,'
  55 else
  56   case "$host_os" in
  57     aix*)
  58       wl='-Wl,'
  59       ;;
  60     darwin*)
  61       case $cc_basename in
  62         xlc*)
  63           wl='-Wl,'
  64           ;;
  65       esac
  66       ;;
  67     mingw* | pw32* | os2*)
  68       ;;
  69     hpux9* | hpux10* | hpux11*)
  70       wl='-Wl,'
  71       ;;
  72     irix5* | irix6* | nonstopux*)
  73       wl='-Wl,'
  74       ;;
  75     newsos6)
  76       ;;
  77     linux*)
  78       case $cc_basename in
  79         icc* | ecc*)
  80           wl='-Wl,'
  81           ;;
  82         pgcc | pgf77 | pgf90)
  83           wl='-Wl,'
  84           ;;
  85         ccc*)
  86           wl='-Wl,'
  87           ;;
  88         como)
  89           wl='-lopt='
  90           ;;
  91         *)
  92           case `$CC -V 2>&1 | sed 5q` in
  93             *Sun\ C*)
  94               wl='-Wl,'
  95               ;;
  96           esac
  97           ;;
  98       esac
  99       ;;
 100     osf3* | osf4* | osf5*)
 101       wl='-Wl,'
 102       ;;
 103     sco3.2v5*)
 104       ;;
 105     solaris*)
 106       wl='-Wl,'
 107       ;;
 108     sunos4*)
 109       wl='-Qoption ld '
 110       ;;
 111     sysv4 | sysv4.2uw2* | sysv4.3* | sysv5*)
 112       wl='-Wl,'
 113       ;;
 114     sysv4*MP*)
 115       ;;
 116     unicos*)
 117       wl='-Wl,'
 118       ;;
 119     uts4*)
 120       ;;
 121   esac
 122 fi
 123
 124 # Code taken from libtool.m4's AC_LIBTOOL_PROG_LD_SHLIBS.
 125
 126 hardcode_libdir_flag_spec=
 127 hardcode_libdir_separator=
 128 hardcode_direct=no
 129 hardcode_minus_L=no
 130
 131 case "$host_os" in
 132   cygwin* | mingw* | pw32*)
 133     # FIXME: the MSVC++ port hasn't been tested in a loooong time
 134     # When not using gcc, we currently assume that we are using
 135     # Microsoft Visual C++.
 136     if test "$GCC" != yes; then
 137       with_gnu_ld=no
 138     fi
 139     ;;
 140   interix*)
 141     # we just hope/assume this is gcc and not c89 (= MSVC++)
 142     with_gnu_ld=yes
 143     ;;
 144   openbsd*)
 145     with_gnu_ld=no
 146     ;;
 147 esac
 148
 149 ld_shlibs=yes
 150 if test "$with_gnu_ld" = yes; then
 151   # Set some defaults for GNU ld with shared library support. These
 152   # are reset later if shared libraries are not supported. Putting them
 153   # here allows them to be overridden if necessary.
 154   # Unlike libtool, we use -rpath here, not --rpath, since the documented
 155   # option of GNU ld is called -rpath, not --rpath.
 156   hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
 157   case "$host_os" in
 158     aix3* | aix4* | aix5*)
 159       # On AIX/PPC, the GNU linker is very broken
 160       if test "$host_cpu" != ia64; then
 161         ld_shlibs=no
 162       fi
 163       ;;
 164     amigaos*)
 165       hardcode_libdir_flag_spec='-L$libdir'
 166       hardcode_minus_L=yes
 167       # Samuel A. Falvo II <kc5tja@dolphin.openprojects.net> reports
 168       # that the semantics of dynamic libraries on AmigaOS, at least up
 169       # to version 4, is to share data among multiple programs linked
 170       # with the same dynamic library.  Since this doesn't match the
 171       # behavior of shared libraries on other platforms, we cannot use
 172       # them.
 173       ld_shlibs=no
 174       ;;
 175     beos*)
 176       if $LD --help 2>&1 | grep ': supported targets:.* elf' > /dev/null; then
 177         :
 178       else
 179         ld_shlibs=no
 180       fi
 181       ;;
 182     cygwin* | mingw* | pw32*)
 183       # hardcode_libdir_flag_spec is actually meaningless, as there is
 184       # no search path for DLLs.
 185       hardcode_libdir_flag_spec='-L$libdir'
 186       if $LD --help 2>&1 | grep 'auto-import' > /dev/null; then
 187         :
 188       else
 189         ld_shlibs=no
 190       fi
 191       ;;
 192     interix3*)
 193       hardcode_direct=no
 194       hardcode_libdir_flag_spec='${wl}-rpath,$libdir'
 195       ;;
 196     linux*)
 197       if $LD --help 2>&1 | grep ': supported targets:.* elf' > /dev/null; then
 198         :
 199       else
 200         ld_shlibs=no
 201       fi
 202       ;;
 203     netbsd*)
 204       ;;
 205     solaris*)
 206       if $LD -v 2>&1 | grep 'BFD 2\.8' > /dev/null; then
 207         ld_shlibs=no
 208       elif $LD --help 2>&1 | grep ': supported targets:.* elf' > /dev/null; then
 209         :
 210       else
 211         ld_shlibs=no
 212       fi
 213       ;;
 214     sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX*)
 215       case `$LD -v 2>&1` in
 216         *\ [01].* | *\ 2.[0-9].* | *\ 2.1[0-5].*)
 217           ld_shlibs=no
 218           ;;
 219         *)
 220           if $LD --help 2>&1 | grep ': supported targets:.* elf' > /dev/null; then
 221             hardcode_libdir_flag_spec='`test -z "$SCOABSPATH" && echo ${wl}-rpath,$libdir`'
 222           else
 223             ld_shlibs=no
 224           fi
 225           ;;
 226       esac
 227       ;;
 228     sunos4*)
 229       hardcode_direct=yes
 230       ;;
 231     *)
 232       if $LD --help 2>&1 | grep ': supported targets:.* elf' > /dev/null; then
 233         :
 234       else
 235         ld_shlibs=no
 236       fi
 237       ;;
 238   esac
 239   if test "$ld_shlibs" = no; then
 240     hardcode_libdir_flag_spec=
 241   fi
 242 else
 243   case "$host_os" in
 244     aix3*)
 245       # Note: this linker hardcodes the directories in LIBPATH if there
 246       # are no directories specified by -L.
 247       hardcode_minus_L=yes
 248       if test "$GCC" = yes; then
 249         # Neither direct hardcoding nor static linking is supported with a
 250         # broken collect2.
 251         hardcode_direct=unsupported
 252       fi
 253       ;;
 254     aix4* | aix5*)
 255       if test "$host_cpu" = ia64; then
 256         # On IA64, the linker does run time linking by default, so we don't
 257         # have to do anything special.
 258         aix_use_runtimelinking=no
 259       else
 260         aix_use_runtimelinking=no
 261         # Test if we are trying to use run time linking or normal
 262         # AIX style linking. If -brtl is somewhere in LDFLAGS, we
 263         # need to do runtime linking.
 264         case $host_os in aix4.[23]|aix4.[23].*|aix5*)
 265           for ld_flag in $LDFLAGS; do
 266             if (test $ld_flag = "-brtl" || test $ld_flag = "-Wl,-brtl"); then
 267               aix_use_runtimelinking=yes
 268               break
 269             fi
 270           done
 271           ;;
 272         esac
 273       fi
 274       hardcode_direct=yes
 275       hardcode_libdir_separator=':'
 276       if test "$GCC" = yes; then
 277         case $host_os in aix4.[012]|aix4.[012].*)
 278           collect2name=`${CC} -print-prog-name=collect2`
 279           if test -f "$collect2name" && \
 280             strings "$collect2name" | grep resolve_lib_name >/dev/null
 281           then
 282             # We have reworked collect2
 283             hardcode_direct=yes
 284           else
 285             # We have old collect2
 286             hardcode_direct=unsupported
 287             hardcode_minus_L=yes
 288             hardcode_libdir_flag_spec='-L$libdir'
 289             hardcode_libdir_separator=
 290           fi
 291           ;;
 292         esac
 293       fi
 294       # Begin _LT_AC_SYS_LIBPATH_AIX.
 295       echo 'int main () { return 0; }' > conftest.c
 296       ${CC} ${LDFLAGS} conftest.c -o conftest
 297       aix_libpath=`dump -H conftest 2>/dev/null | sed -n -e '/Import File Strings/,/^$/ { /^0/ { s/^0  *\(.*\)$/\1/; p; }
 298 }'`
 299       if test -z "$aix_libpath"; then
 300         aix_libpath=`dump -HX64 conftest 2>/dev/null | sed -n -e '/Import File Strings/,/^$/ { /^0/ { s/^0  *\(.*\)$/\1/; p; }
 301 }'`
 302       fi
 303       if test -z "$aix_libpath"; then
 304         aix_libpath="/usr/lib:/lib"
 305       fi
 306       rm -f conftest.c conftest
 307       # End _LT_AC_SYS_LIBPATH_AIX.
 308       if test "$aix_use_runtimelinking" = yes; then
 309         hardcode_libdir_flag_spec='${wl}-blibpath:$libdir:'"$aix_libpath"
 310       else
 311         if test "$host_cpu" = ia64; then
 312           hardcode_libdir_flag_spec='${wl}-R $libdir:/usr/lib:/lib'
 313         else
 314           hardcode_libdir_flag_spec='${wl}-blibpath:$libdir:'"$aix_libpath"
 315         fi
 316       fi
 317       ;;
 318     amigaos*)
 319       hardcode_libdir_flag_spec='-L$libdir'
 320       hardcode_minus_L=yes
 321       # see comment about different semantics on the GNU ld section
 322       ld_shlibs=no
 323       ;;
 324     bsdi[45]*)
 325       ;;
 326     cygwin* | mingw* | pw32*)
 327       # When not using gcc, we currently assume that we are using
 328       # Microsoft Visual C++.
 329       # hardcode_libdir_flag_spec is actually meaningless, as there is
 330       # no search path for DLLs.
 331       hardcode_libdir_flag_spec=' '
 332       libext=lib
 333       ;;
 334     darwin* | rhapsody*)
 335       hardcode_direct=no
 336       if test "$GCC" = yes ; then
 337         :
 338       else
 339         case $cc_basename in
 340           xlc*)
 341             ;;
 342           *)
 343             ld_shlibs=no
 344             ;;
 345         esac
 346       fi
 347       ;;
 348     dgux*)
 349       hardcode_libdir_flag_spec='-L$libdir'
 350       ;;
 351     freebsd1*)
 352       ld_shlibs=no
 353       ;;
 354     freebsd2.2*)
 355       hardcode_libdir_flag_spec='-R$libdir'
 356       hardcode_direct=yes
 357       ;;
 358     freebsd2*)
 359       hardcode_direct=yes
 360       hardcode_minus_L=yes
 361       ;;
 362     freebsd* | kfreebsd*-gnu | dragonfly*)
 363       hardcode_libdir_flag_spec='-R$libdir'
 364       hardcode_direct=yes
 365       ;;
 366     hpux9*)
 367       hardcode_libdir_flag_spec='${wl}+b ${wl}$libdir'
 368       hardcode_libdir_separator=:
 369       hardcode_direct=yes
 370       # hardcode_minus_L: Not really in the search PATH,
 371       # but as the default location of the library.
 372       hardcode_minus_L=yes
 373       ;;
 374     hpux10*)
 375       if test "$with_gnu_ld" = no; then
 376         hardcode_libdir_flag_spec='${wl}+b ${wl}$libdir'
 377         hardcode_libdir_separator=:
 378         hardcode_direct=yes
 379         # hardcode_minus_L: Not really in the search PATH,
 380         # but as the default location of the library.
 381         hardcode_minus_L=yes
 382       fi
 383       ;;
 384     hpux11*)
 385       if test "$with_gnu_ld" = no; then
 386         hardcode_libdir_flag_spec='${wl}+b ${wl}$libdir'
 387         hardcode_libdir_separator=:
 388         case $host_cpu in
 389           hppa*64*|ia64*)
 390             hardcode_direct=no
 391             ;;
 392           *)
 393             hardcode_direct=yes
 394             # hardcode_minus_L: Not really in the search PATH,
 395             # but as the default location of the library.
 396             hardcode_minus_L=yes
 397             ;;
 398         esac
 399       fi
 400       ;;
 401     irix5* | irix6* | nonstopux*)
 402       hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
 403       hardcode_libdir_separator=:
 404       ;;
 405     netbsd*)
 406       hardcode_libdir_flag_spec='-R$libdir'
 407       hardcode_direct=yes
 408       ;;
 409     newsos6)
 410       hardcode_direct=yes
 411       hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
 412       hardcode_libdir_separator=:
 413       ;;
 414     openbsd*)
 415       hardcode_direct=yes
 416       if test -z "`echo __ELF__ | $CC -E - | grep __ELF__`" || test "$host_os-$host_cpu" = "openbsd2.8-powerpc"; then
 417         hardcode_libdir_flag_spec='${wl}-rpath,$libdir'
 418       else
 419         case "$host_os" in
 420           openbsd[01].* | openbsd2.[0-7] | openbsd2.[0-7].*)
 421             hardcode_libdir_flag_spec='-R$libdir'
 422             ;;
 423           *)
 424             hardcode_libdir_flag_spec='${wl}-rpath,$libdir'
 425             ;;
 426         esac
 427       fi
 428       ;;
 429     os2*)
 430       hardcode_libdir_flag_spec='-L$libdir'
 431       hardcode_minus_L=yes
 432       ;;
 433     osf3*)
 434       hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
 435       hardcode_libdir_separator=:
 436       ;;
 437     osf4* | osf5*)
 438       if test "$GCC" = yes; then
 439         hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
 440       else
 441         # Both cc and cxx compiler support -rpath directly
 442         hardcode_libdir_flag_spec='-rpath $libdir'
 443       fi
 444       hardcode_libdir_separator=:
 445       ;;
 446     solaris*)
 447       hardcode_libdir_flag_spec='-R$libdir'
 448       ;;
 449     sunos4*)
 450       hardcode_libdir_flag_spec='-L$libdir'
 451       hardcode_direct=yes
 452       hardcode_minus_L=yes
 453       ;;
 454     sysv4)
 455       case $host_vendor in
 456         sni)
 457           hardcode_direct=yes # is this really true???
 458           ;;
 459         siemens)
 460           hardcode_direct=no
 461           ;;
 462         motorola)
 463           hardcode_direct=no #Motorola manual says yes, but my tests say they lie
 464           ;;
 465       esac
 466       ;;
 467     sysv4.3*)
 468       ;;
 469     sysv4*MP*)
 470       if test -d /usr/nec; then
 471         ld_shlibs=yes
 472       fi
 473       ;;
 474     sysv4*uw2* | sysv5OpenUNIX* | sysv5UnixWare7.[01].[10]* | unixware7*)
 475       ;;
 476     sysv5* | sco3.2v5* | sco5v6*)
 477       hardcode_libdir_flag_spec='`test -z "$SCOABSPATH" && echo ${wl}-R,$libdir`'
 478       hardcode_libdir_separator=':'
 479       ;;
 480     uts4*)
 481       hardcode_libdir_flag_spec='-L$libdir'
 482       ;;
 483     *)
 484       ld_shlibs=no
 485       ;;
 486   esac
 487 fi
 488
 489 # Check dynamic linker characteristics
 490 # Code taken from libtool.m4's AC_LIBTOOL_SYS_DYNAMIC_LINKER.
 491 # Unlike libtool.m4, here we don't care about _all_ names of the library, but
 492 # only about the one the linker finds when passed -lNAME. This is the last
 493 # element of library_names_spec in libtool.m4, or possibly two of them if the
 494 # linker has special search rules.
 495 library_names_spec=      # the last element of library_names_spec in libtool.m4
 496 libname_spec='lib$name'
 497 case "$host_os" in
 498   aix3*)
 499     library_names_spec='$libname.a'
 500     ;;
 501   aix4* | aix5*)
 502     library_names_spec='$libname$shrext'
 503     ;;
 504   amigaos*)
 505     library_names_spec='$libname.a'
 506     ;;
 507   beos*)
 508     library_names_spec='$libname$shrext'
 509     ;;
 510   bsdi[45]*)
 511     library_names_spec='$libname$shrext'
 512     ;;
 513   cygwin* | mingw* | pw32*)
 514     shrext=.dll
 515     library_names_spec='$libname.dll.a $libname.lib'
 516     ;;
 517   darwin* | rhapsody*)
 518     shrext=.dylib
 519     library_names_spec='$libname$shrext'
 520     ;;
 521   dgux*)
 522     library_names_spec='$libname$shrext'
 523     ;;
 524   freebsd1*)
 525     ;;
 526   kfreebsd*-gnu)
 527     library_names_spec='$libname$shrext'
 528     ;;
 529   freebsd* | dragonfly*)
 530     case "$host_os" in
 531       freebsd[123]*)
 532         library_names_spec='$libname$shrext$versuffix' ;;
 533       *)
 534         library_names_spec='$libname$shrext' ;;
 535     esac
 536     ;;
 537   gnu*)
 538     library_names_spec='$libname$shrext'
 539     ;;
 540   hpux9* | hpux10* | hpux11*)
 541     case $host_cpu in
 542       ia64*)
 543         shrext=.so
 544         ;;
 545       hppa*64*)
 546         shrext=.sl
 547         ;;
 548       *)
 549         shrext=.sl
 550         ;;
 551     esac
 552     library_names_spec='$libname$shrext'
 553     ;;
 554   interix3*)
 555     library_names_spec='$libname$shrext'
 556     ;;
 557   irix5* | irix6* | nonstopux*)
 558     library_names_spec='$libname$shrext'
 559     case "$host_os" in
 560       irix5* | nonstopux*)
 561         libsuff= shlibsuff=
 562         ;;
 563       *)
 564         case $LD in
 565           *-32|*"-32 "|*-melf32bsmip|*"-melf32bsmip ") libsuff= shlibsuff= ;;
 566           *-n32|*"-n32 "|*-melf32bmipn32|*"-melf32bmipn32 ") libsuff=32 shlibsuff=N32 ;;
 567           *-64|*"-64 "|*-melf64bmip|*"-melf64bmip ") libsuff=64 shlibsuff=64 ;;
 568           *) libsuff= shlibsuff= ;;
 569         esac
 570         ;;
 571     esac
 572     ;;
 573   linux*oldld* | linux*aout* | linux*coff*)
 574     ;;
 575   linux*)
 576     library_names_spec='$libname$shrext'
 577     ;;
 578   knetbsd*-gnu)
 579     library_names_spec='$libname$shrext'
 580     ;;
 581   netbsd*)
 582     library_names_spec='$libname$shrext'
 583     ;;
 584   newsos6)
 585     library_names_spec='$libname$shrext'
 586     ;;
 587   nto-qnx*)
 588     library_names_spec='$libname$shrext'
 589     ;;
 590   openbsd*)
 591     library_names_spec='$libname$shrext$versuffix'
 592     ;;
 593   os2*)
 594     libname_spec='$name'
 595     shrext=.dll
 596     library_names_spec='$libname.a'
 597     ;;
 598   osf3* | osf4* | osf5*)
 599     library_names_spec='$libname$shrext'
 600     ;;
 601   solaris*)
 602     library_names_spec='$libname$shrext'
 603     ;;
 604   sunos4*)
 605     library_names_spec='$libname$shrext$versuffix'
 606     ;;
 607   sysv4 | sysv4.3*)
 608     library_names_spec='$libname$shrext'
 609     ;;
 610   sysv4*MP*)
 611     library_names_spec='$libname$shrext'
 612     ;;
 613   sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX* | sysv4*uw2*)
 614     library_names_spec='$libname$shrext'
 615     ;;
 616   uts4*)
 617     library_names_spec='$libname$shrext'
 618     ;;
 619 esac
 620
 621 sed_quote_subst='s/\(["`$\\]\)/\\\1/g'
 622 escaped_wl=`echo "X$wl" | sed -e 's/^X//' -e "$sed_quote_subst"`
 623 shlibext=`echo "$shrext" | sed -e 's,^\.,,'`
 624 escaped_libname_spec=`echo "X$libname_spec" | sed -e 's/^X//' -e "$sed_quote_subst"`
 625 escaped_library_names_spec=`echo "X$library_names_spec" | sed -e 's/^X//' -e "$sed_quote_subst"`
 626 escaped_hardcode_libdir_flag_spec=`echo "X$hardcode_libdir_flag_spec" | sed -e 's/^X//' -e "$sed_quote_subst"`
 627
 628 LC_ALL=C sed -e 's/^\([a-zA-Z0-9_]*\)=/acl_cv_\1=/' <<EOF
 629
 630 # How to pass a linker flag through the compiler.
 631 wl="$escaped_wl"
 632
 633 # Static library suffix (normally "a").
 634 libext="$libext"
 635
 636 # Shared library suffix (normally "so").
 637 shlibext="$shlibext"
 638
 639 # Format of library name prefix.
 640 libname_spec="$escaped_libname_spec"
 641
 642 # Library names that the linker finds when passed -lNAME.
 643 library_names_spec="$escaped_library_names_spec"
 644
 645 # Flag to hardcode \$libdir into a binary during linking.
 646 # This must work even if \$libdir does not exist.
 647 hardcode_libdir_flag_spec="$escaped_hardcode_libdir_flag_spec"
 648
 649 # Whether we need a single -rpath flag with a separated argument.
 650 hardcode_libdir_separator="$hardcode_libdir_separator"
 651
 652 # Set to yes if using DIR/libNAME.so during linking hardcodes DIR into the
 653 # resulting binary.
 654 hardcode_direct="$hardcode_direct"
 655
 656 # Set to yes if using the -LDIR flag during linking hardcodes DIR into the
 657 # resulting binary.
 658 hardcode_minus_L="$hardcode_minus_L"
 659
 660 EOF