source: branches/libc-0.6/src/gcc/ltcf-c.sh@ 3103

#### This script is meant to be sourced by ltconfig.

# ltcf-c.sh - Create a C compiler specific configuration
#
# Copyright (C) 1996-2000, 2001 Free Software Foundation, Inc.
# Originally by Gordon Matzigkeit <[email protected]>, 1996
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# As a special exception to the GNU General Public License, if you
# distribute this file as part of a program that contains a
# configuration script generated by Autoconf, you may include it under
# the same distribution terms that you use for the rest of that program.


# Source file extension for C test sources.
ac_ext=c

# Object file extension for compiled C test sources.
objext=o

# Code to be used in simple compile tests
lt_simple_compile_test_code="int some_variable = 0;"

# Code to be used in simple link tests
lt_simple_link_test_code='main(){return(0);}'

## Linker Characteristics
case $host_os in
cygwin* | mingw*)
  # FIXME: the MSVC++ port hasn't been tested in a loooong time
  # When not using gcc, we currently assume that we are using
  # Microsoft Visual C++.
  if test "$with_gcc" != yes; then
    with_gnu_ld=no
  fi
  ;;

esac

ld_shlibs=yes
if test "$with_gnu_ld" = yes; then
  # If archive_cmds runs LD, not CC, wlarc should be empty
  wlarc='${wl}'

  # See if GNU ld supports shared libraries.
  case $host_os in
  aix3* | aix4* | aix5*)
    # On AIX/PPC, the GNU linker is very broken
    if test "$host_cpu" != ia64; then
      ld_shlibs=no
      cat <<EOF 1>&2

*** Warning: the GNU linker, at least up to release 2.9.1, is reported
*** to be unable to reliably create shared libraries on AIX.
*** Therefore, libtool is disabling shared libraries support.  If you
*** really care for shared libraries, you may want to modify your PATH
*** so that a non-GNU linker is found, and then restart.

EOF
    fi
    ;;

  amigaos*)
    archive_cmds='$rm $output_objdir/a2ixlibrary.data~$echo "#define NAME $libname" > $output_objdir/a2ixlibrary.data~$echo "#define LIBRARY_ID 1" >> $output_objdir/a2ixlibrary.data~$echo "#define VERSION $major" >> $output_objdir/a2ixlibrary.data~$echo "#define REVISION $revision" >> $output_objdir/a2ixlibrary.data~$AR $AR_FLAGS $lib $libobjs~$RANLIB $lib~(cd $output_objdir && a2ixlibrary -32)'
    hardcode_libdir_flag_spec='-L$libdir'
    hardcode_minus_L=yes

    # Samuel A. Falvo II <[email protected]> reports
    # that the semantics of dynamic libraries on AmigaOS, at least up
    # to version 4, is to share data among multiple programs linked
    # with the same dynamic library.  Since this doesn't match the
    # behavior of shared libraries on other platforms, we can use
    # them.
    ld_shlibs=no
    ;;

  beos*)
    if $LD --help 2>&1 | egrep ': supported targets:.* elf' > /dev/null; then
      allow_undefined_flag=unsupported
      # Joseph Beckenbach <[email protected]> says some releases of gcc
      # support --undefined.  This deserves some investigation.  FIXME
      archive_cmds='$CC -nostart $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname -o $lib'
    else
      ld_shlibs=no
    fi
    ;;

  cygwin* | mingw*)
    # hardcode_libdir_flag_spec is actually meaningless, as there is
    # no search path for DLLs.
    hardcode_libdir_flag_spec='-L$libdir'
    allow_undefined_flag=unsupported
    always_export_symbols=yes

    extract_expsyms_cmds='test -f $output_objdir/impgen.c || \
      sed -e "/^# \/\* impgen\.c starts here \*\//,/^# \/\* impgen.c ends here \*\// { s/^# //; p; }" -e d < $0 > $output_objdir/impgen.c~
      test -f $output_objdir/impgen.exe || (cd $output_objdir && \
      if test "x$HOST_CC" != "x" ; then $HOST_CC -o impgen impgen.c ; \
      else $CC -o impgen impgen.c ; fi)~
      $output_objdir/impgen $dir/$soroot > $output_objdir/$soname-def'

    old_archive_from_expsyms_cmds='$DLLTOOL --as=$AS --dllname $soname --def $output_objdir/$soname-def --output-lib $output_objdir/$newlib'

    # cygwin and mingw dlls have different entry points and sets of symbols
    # to exclude.
    # FIXME: what about values for MSVC?
    dll_entry=__cygwin_dll_entry@12
    dll_exclude_symbols=DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12~
    case $host_os in
    mingw*)
      # mingw values
      dll_entry=_DllMainCRTStartup@12
      dll_exclude_symbols=DllMain@12,DllMainCRTStartup@12,DllEntryPoint@12~
      ;;
    esac

    # mingw and cygwin differ, and it's simplest to just exclude the union
    # of the two symbol sets.
    dll_exclude_symbols=DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12

    # recent cygwin and mingw systems supply a stub DllMain which the user
    # can override, but on older systems we have to supply one (in ltdll.c)
    if test "x$lt_cv_need_dllmain" = "xyes"; then
      ltdll_obj='$output_objdir/$soname-ltdll.'"$objext "
      ltdll_cmds='test -f $output_objdir/$soname-ltdll.c || sed -e "/^# \/\* ltdll\.c starts here \*\//,/^# \/\* ltdll.c ends here \*\// { s/^# //; p; }" -e d < $0 > $output_objdir/$soname-ltdll.c~