aclocal.m4

Linux下的基于X11的图形开发环境。

	lt_cv_prog_cc_static='-bnso -bI:/lib/syscalls.exp'
      fi
      ;;

    hpux9* | hpux10* | hpux11*)
      # Is there a better lt_cv_prog_cc_static that works with the bundled CC?
      lt_cv_prog_cc_wl='-Wl,'
      lt_cv_prog_cc_static="${lt_cv_prog_cc_wl}-a ${lt_cv_prog_cc_wl}archive"
      lt_cv_prog_cc_pic='+Z'
      ;;

    irix5* | irix6*)
      lt_cv_prog_cc_wl='-Wl,'
      lt_cv_prog_cc_static='-non_shared'
      # PIC (with -KPIC) is the default.
      ;;

    cygwin* | mingw* | pw32* | os2*)
      # This hack is so that the source file can tell whether it is being
      # built for inclusion in a dll (and should export symbols for example).
      lt_cv_prog_cc_pic='-DDLL_EXPORT'
      ;;

    newsos6)
      lt_cv_prog_cc_pic='-KPIC'
      lt_cv_prog_cc_static='-Bstatic'
      ;;

    osf3* | osf4* | osf5*)
      # All OSF/1 code is PIC.
      lt_cv_prog_cc_wl='-Wl,'
      lt_cv_prog_cc_static='-non_shared'
      ;;

    sco3.2v5*)
      lt_cv_prog_cc_pic='-Kpic'
      lt_cv_prog_cc_static='-dn'
      lt_cv_prog_cc_shlib='-belf'
      ;;

    solaris*)
      lt_cv_prog_cc_pic='-KPIC'
      lt_cv_prog_cc_static='-Bstatic'
      lt_cv_prog_cc_wl='-Wl,'
      ;;

    sunos4*)
      lt_cv_prog_cc_pic='-PIC'
      lt_cv_prog_cc_static='-Bstatic'
      lt_cv_prog_cc_wl='-Qoption ld '
      ;;

    sysv4 | sysv4.2uw2* | sysv4.3* | sysv5*)
      lt_cv_prog_cc_pic='-KPIC'
      lt_cv_prog_cc_static='-Bstatic'
      if test "x$host_vendor" = xsni; then
	lt_cv_prog_cc_wl='-LD'
      else
	lt_cv_prog_cc_wl='-Wl,'
      fi
      ;;

    uts4*)
      lt_cv_prog_cc_pic='-pic'
      lt_cv_prog_cc_static='-Bstatic'
      ;;

    sysv4*MP*)
      if test -d /usr/nec ;then
	lt_cv_prog_cc_pic='-Kconform_pic'
	lt_cv_prog_cc_static='-Bstatic'
      fi
      ;;

    *)
      lt_cv_prog_cc_can_build_shared=no
      ;;
    esac
  fi
])
if test -z "$lt_cv_prog_cc_pic"; then
  AC_MSG_RESULT([none])
else
  AC_MSG_RESULT([$lt_cv_prog_cc_pic])

  # Check to make sure the pic_flag actually works.
  AC_MSG_CHECKING([if $compiler PIC flag $lt_cv_prog_cc_pic works])
  AC_CACHE_VAL(lt_cv_prog_cc_pic_works, [dnl
    save_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS $lt_cv_prog_cc_pic -DPIC"
    AC_TRY_COMPILE([], [], [dnl
      case $host_os in
      hpux9* | hpux10* | hpux11*)
	# On HP-UX, both CC and GCC only warn that PIC is supported... then
	# they create non-PIC objects.  So, if there were any warnings, we
	# assume that PIC is not supported.
	if test -s conftest.err; then
	  lt_cv_prog_cc_pic_works=no
	else
	  lt_cv_prog_cc_pic_works=yes
	fi
	;;
      *)
	lt_cv_prog_cc_pic_works=yes
	;;
      esac
    ], [dnl
      lt_cv_prog_cc_pic_works=no
    ])
    CFLAGS="$save_CFLAGS"
  ])

  if test "X$lt_cv_prog_cc_pic_works" = Xno; then
    lt_cv_prog_cc_pic=
    lt_cv_prog_cc_can_build_shared=no
  else
    lt_cv_prog_cc_pic=" $lt_cv_prog_cc_pic"
  fi

  AC_MSG_RESULT([$lt_cv_prog_cc_pic_works])
fi

# Check for any special shared library compilation flags.
if test -n "$lt_cv_prog_cc_shlib"; then
  AC_MSG_WARN([\`$CC' requires \`$lt_cv_prog_cc_shlib' to build shared libraries])
  if echo "$old_CC $old_CFLAGS " | egrep -e "[[ 	]]$lt_cv_prog_cc_shlib[[ 	]]" >/dev/null; then :
  else
   AC_MSG_WARN([add \`$lt_cv_prog_cc_shlib' to the CC or CFLAGS env variable and reconfigure])
    lt_cv_prog_cc_can_build_shared=no
  fi
fi

AC_MSG_CHECKING([if $compiler static flag $lt_cv_prog_cc_static works])
AC_CACHE_VAL([lt_cv_prog_cc_static_works], [dnl
  lt_cv_prog_cc_static_works=no
  save_LDFLAGS="$LDFLAGS"
  LDFLAGS="$LDFLAGS $lt_cv_prog_cc_static"
  AC_TRY_LINK([], [], [lt_cv_prog_cc_static_works=yes])
  LDFLAGS="$save_LDFLAGS"
])

# Belt *and* braces to stop my trousers falling down:
test "X$lt_cv_prog_cc_static_works" = Xno && lt_cv_prog_cc_static=
AC_MSG_RESULT([$lt_cv_prog_cc_static_works])

pic_flag="$lt_cv_prog_cc_pic"
special_shlib_compile_flags="$lt_cv_prog_cc_shlib"
wl="$lt_cv_prog_cc_wl"
link_static_flag="$lt_cv_prog_cc_static"
no_builtin_flag="$lt_cv_prog_cc_no_builtin"
can_build_shared="$lt_cv_prog_cc_can_build_shared"


# Check to see if options -o and -c are simultaneously supported by compiler
AC_MSG_CHECKING([if $compiler supports -c -o file.$ac_objext])
AC_CACHE_VAL([lt_cv_compiler_c_o], [
$rm -r conftest 2>/dev/null
mkdir conftest
cd conftest
echo "int some_variable = 0;" > conftest.$ac_ext
mkdir out
# According to Tom Tromey, Ian Lance Taylor reported there are C compilers
# that will create temporary files in the current directory regardless of
# the output directory.  Thus, making CWD read-only will cause this test
# to fail, enabling locking or at least warning the user not to do parallel
# builds.
chmod -w .
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -o out/conftest2.$ac_objext"
compiler_c_o=no
if { (eval echo configure:__oline__: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>out/conftest.err; } && test -s out/conftest2.$ac_objext; then
  # The compiler can only warn and ignore the option if not recognized
  # So say no if there are warnings
  if test -s out/conftest.err; then
    lt_cv_compiler_c_o=no
  else
    lt_cv_compiler_c_o=yes
  fi
else
  # Append any errors to the config.log.
  cat out/conftest.err 1>&AC_FD_CC
  lt_cv_compiler_c_o=no
fi
CFLAGS="$save_CFLAGS"
chmod u+w .
$rm conftest* out/*
rmdir out
cd ..
rmdir conftest
$rm -r conftest 2>/dev/null
])
compiler_c_o=$lt_cv_compiler_c_o
AC_MSG_RESULT([$compiler_c_o])

if test x"$compiler_c_o" = x"yes"; then
  # Check to see if we can write to a .lo
  AC_MSG_CHECKING([if $compiler supports -c -o file.lo])
  AC_CACHE_VAL([lt_cv_compiler_o_lo], [
  lt_cv_compiler_o_lo=no
  save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -c -o conftest.lo"
  save_objext="$ac_objext"
  ac_objext=lo
  AC_TRY_COMPILE([], [int some_variable = 0;], [dnl
    # The compiler can only warn and ignore the option if not recognized
    # So say no if there are warnings
    if test -s conftest.err; then
      lt_cv_compiler_o_lo=no
    else
      lt_cv_compiler_o_lo=yes
    fi
  ])
  ac_objext="$save_objext"
  CFLAGS="$save_CFLAGS"
  ])
  compiler_o_lo=$lt_cv_compiler_o_lo
  AC_MSG_RESULT([$compiler_o_lo])
else
  compiler_o_lo=no
fi

# Check to see if we can do hard links to lock some files if needed
hard_links="nottested"
if test "$compiler_c_o" = no && test "$need_locks" != no; then
  # do not overwrite the value of need_locks provided by the user
  AC_MSG_CHECKING([if we can lock with hard links])
  hard_links=yes
  $rm conftest*
  ln conftest.a conftest.b 2>/dev/null && hard_links=no
  touch conftest.a
  ln conftest.a conftest.b 2>&5 || hard_links=no
  ln conftest.a conftest.b 2>/dev/null && hard_links=no
  AC_MSG_RESULT([$hard_links])
  if test "$hard_links" = no; then
    AC_MSG_WARN([\`$CC' does not support \`-c -o', so \`make -j' may be unsafe])
    need_locks=warn
  fi
else
  need_locks=no
fi

if test "$GCC" = yes; then
  # Check to see if options -fno-rtti -fno-exceptions are supported by compiler
  AC_MSG_CHECKING([if $compiler supports -fno-rtti -fno-exceptions])
  echo "int some_variable = 0;" > conftest.$ac_ext
  save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -fno-rtti -fno-exceptions -c conftest.$ac_ext"
  compiler_rtti_exceptions=no
  AC_TRY_COMPILE([], [int some_variable = 0;], [dnl
    # The compiler can only warn and ignore the option if not recognized
    # So say no if there are warnings
    if test -s conftest.err; then
      compiler_rtti_exceptions=no
    else
      compiler_rtti_exceptions=yes
    fi
  ])
  CFLAGS="$save_CFLAGS"
  AC_MSG_RESULT([$compiler_rtti_exceptions])

  if test "$compiler_rtti_exceptions" = "yes"; then
    no_builtin_flag=' -fno-builtin -fno-rtti -fno-exceptions'
  else
    no_builtin_flag=' -fno-builtin'
  fi
fi

# See if the linker supports building shared libraries.
AC_MSG_CHECKING([whether the linker ($LD) supports shared libraries])

allow_undefined_flag=
no_undefined_flag=
need_lib_prefix=unknown
need_version=unknown
# when you set need_version to no, make sure it does not cause -set_version
# flags to be left without arguments
archive_cmds=
archive_expsym_cmds=
old_archive_from_new_cmds=
old_archive_from_expsyms_cmds=
export_dynamic_flag_spec=
whole_archive_flag_spec=
thread_safe_flag_spec=
hardcode_into_libs=no
hardcode_libdir_flag_spec=
hardcode_libdir_separator=
hardcode_direct=no
hardcode_minus_L=no
hardcode_shlibpath_var=unsupported
runpath_var=
link_all_deplibs=unknown
always_export_symbols=no
export_symbols_cmds='$NM $libobjs $convenience | $global_symbol_pipe | sed '\''s/.* //'\'' | sort | uniq > $export_symbols'
# include_expsyms should be a list of space-separated symbols to be *always*
# included in the symbol list
include_expsyms=
# exclude_expsyms can be an egrep regular expression of symbols to exclude
# it will be wrapped by ` (' and `)$', so one must not match beginning or
# end of line.  Example: `a|bc|.*d.*' will exclude the symbols `a' and `bc',
# as well as any symbol that contains `d'.
exclude_expsyms="_GLOBAL_OFFSET_TABLE_"
# Although _GLOBAL_OFFSET_TABLE_ is a valid symbol C name, most a.out
# platforms (ab)use it in PIC code, but their linkers get confused if
# the symbol is explicitly referenced.  Since portable code cannot
# rely on this symbol name, it's probably fine to never include it in
# preloaded symbol tables.
extract_expsyms_cmds=

case $host_os in
cygwin* | mingw* | pw32*)
  # FIXME: the MSVC++ port hasn't been tested in a loooong time
  # When not using gcc, we currently assume that we are using
  # Microsoft Visual C++.
  if test "$GCC" != yes; then
    with_gnu_ld=no
  fi
  ;;
openbsd*)
  with_gnu_ld=no
  ;;
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, the GNU linker is very broken
    # Note:Check GNU linker on AIX 5-IA64 when/if it becomes available.
    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
    ;;

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

  cygwin* | mingw* | pw32*)
    # 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 $output_objdir/impgen.c || \
      sed -e "/^# \/\* impgen\.c starts here \*\//,/^# \/\* impgen.c ends here \*\// { s/^# //;s/^# *$//; 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~