aclocal.m4

用C语言实现的JPEG编码

      # need to do runtime linking.
      case $host_os in aix4.[[23]]|aix4.[[23]].*|aix5*)
	for ld_flag in $LDFLAGS; do
	  if (test $ld_flag = "-brtl" || test $ld_flag = "-Wl,-brtl"); then
	    aix_use_runtimelinking=yes
	    break
	  fi
	done
      esac

      exp_sym_flag='-bexport'
      no_entry_flag='-bnoentry'
    fi

    # When large executables or shared objects are built, AIX ld can
    # have problems creating the table of contents.  If linking a library
    # or program results in "error TOC overflow" add -mminimal-toc to
    # CXXFLAGS/CFLAGS for g++/gcc.  In the cases where that is not
    # enough to fix the problem, add -Wl,-bbigtoc to LDFLAGS.

    hardcode_direct=yes
    archive_cmds=''
    hardcode_libdir_separator=':'
    if test "$GCC" = yes; then
      case $host_os in aix4.[[012]]|aix4.[[012]].*)
	collect2name=`${CC} -print-prog-name=collect2`
	if test -f "$collect2name" && \
	  strings "$collect2name" | grep resolve_lib_name >/dev/null
	then
	  # We have reworked collect2
	  hardcode_direct=yes
	else
	  # We have old collect2
	  hardcode_direct=unsupported
	  # It fails to find uninstalled libraries when the uninstalled
	  # path is not listed in the libpath.  Setting hardcode_minus_L
	  # to unsupported forces relinking
	  hardcode_minus_L=yes
	  hardcode_libdir_flag_spec='-L$libdir'
	  hardcode_libdir_separator=
	fi
      esac

      shared_flag='-shared'
    else
      # not using gcc
      if test "$host_cpu" = ia64; then
	shared_flag='${wl}-G'
      else
	if test "$aix_use_runtimelinking" = yes; then
	  shared_flag='${wl}-G'
	else
	  shared_flag='${wl}-bM:SRE'
	fi
      fi
    fi

    # It seems that -bexpall can do strange things, so it is better to
    # generate a list of symbols to export.
    always_export_symbols=yes
    if test "$aix_use_runtimelinking" = yes; then
      # Warning - without using the other runtime loading flags (-brtl),
      # -berok will link without error, but may produce a broken library.
      allow_undefined_flag='-berok'
      hardcode_libdir_flag_spec='${wl}-blibpath:$libdir:/usr/lib:/lib'
      archive_expsym_cmds="\$CC"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags `if test "x${allow_undefined_flag}" != "x"; then echo "${wl}${allow_undefined_flag}"; else :; fi` '"\${wl}$no_entry_flag \${wl}$exp_sym_flag:\$export_symbols $shared_flag"
    else
      if test "$host_cpu" = ia64; then
	hardcode_libdir_flag_spec='${wl}-R $libdir:/usr/lib:/lib'
	allow_undefined_flag="-z nodefs"
	archive_expsym_cmds="\$CC $shared_flag"' -o $output_objdir/$soname ${wl}-h$soname $libobjs $deplibs $compiler_flags ${wl}${allow_undefined_flag} '"\${wl}$no_entry_flag \${wl}$exp_sym_flag:\$export_symbols"
      else
	hardcode_libdir_flag_spec='${wl}-bnolibpath ${wl}-blibpath:$libdir:/usr/lib:/lib'
	# Warning - without using the other run time loading flags,
	# -berok will link without error, but may produce a broken library.
	allow_undefined_flag='${wl}-berok'
	# This is a bit strange, but is similar to how AIX traditionally builds
	# it's shared libraries.
	archive_expsym_cmds="\$CC $shared_flag"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags ${allow_undefined_flag} '"\${wl}$no_entry_flag \${wl}$exp_sym_flag:\$export_symbols"' ~$AR -crlo $objdir/$libname$release.a $objdir/$soname'
      fi
    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
    # see comment about different semantics on the GNU ld section
    ld_shlibs=no
    ;;

  cygwin* | mingw* | pw32*)
    # When not using gcc, we currently assume that we are using
    # Microsoft Visual C++.
    # hardcode_libdir_flag_spec is actually meaningless, as there is
    # no search path for DLLs.
    hardcode_libdir_flag_spec=' '
    allow_undefined_flag=unsupported
    # Tell ltmain to make .lib files, not .a files.
    libext=lib
    # FIXME: Setting linknames here is a bad hack.
    archive_cmds='$CC -o $lib $libobjs $compiler_flags `echo "$deplibs" | sed -e '\''s/ -lc$//'\''` -link -dll~linknames='
    # The linker will automatically build a .lib file if we build a DLL.
    old_archive_from_new_cmds='true'
    # FIXME: Should let the user specify the lib program.
    old_archive_cmds='lib /OUT:$oldlib$oldobjs$old_deplibs'
    fix_srcfile_path='`cygpath -w "$srcfile"`'
    ;;

  darwin* | rhapsody*)
    case "$host_os" in
    rhapsody* | darwin1.[[012]])
      allow_undefined_flag='-undefined suppress'
      ;;
    *) # Darwin 1.3 on
      allow_undefined_flag='-flat_namespace -undefined suppress'
      ;;
    esac
    # FIXME: Relying on posixy $() will cause problems for
    #        cross-compilation, but unfortunately the echo tests do not
    #        yet detect zsh echo's removal of \ escapes.
    archive_cmds='$nonopt $(test "x$module" = xyes && echo -bundle || echo -dynamiclib) $allow_undefined_flag -o $lib $libobjs $deplibs$linker_flags -install_name $rpath/$soname $verstring'
    # We need to add '_' to the symbols in $export_symbols first
    #archive_expsym_cmds="$archive_cmds"' && strip -s $export_symbols'
    hardcode_direct=yes
    hardcode_shlibpath_var=no
    whole_archive_flag_spec='-all_load $convenience'
    ;;

  freebsd1*)
    ld_shlibs=no
    ;;

  # FreeBSD 2.2.[012] allows us to include c++rt0.o to get C++ constructor
  # support.  Future versions do this automatically, but an explicit c++rt0.o
  # does not break anything, and helps significantly (at the cost of a little
  # extra space).
  freebsd2.2*)
    archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linker_flags /usr/lib/c++rt0.o'
    hardcode_libdir_flag_spec='-R$libdir'
    hardcode_direct=yes
    hardcode_shlibpath_var=no
    ;;

  # Unfortunately, older versions of FreeBSD 2 do not have this feature.
  freebsd2*)
    archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linker_flags'
    hardcode_direct=yes
    hardcode_minus_L=yes
    hardcode_shlibpath_var=no
    ;;

  # FreeBSD 3 and greater uses gcc -shared to do shared libraries.
  freebsd*)
    archive_cmds='$CC -shared -o $lib $libobjs $deplibs $compiler_flags'
    hardcode_libdir_flag_spec='-R$libdir'
    hardcode_direct=yes
    hardcode_shlibpath_var=no
    ;;

  hpux9* | hpux10* | hpux11*)
    case $host_os in
    hpux9*) archive_cmds='$rm $output_objdir/$soname~$LD -b +b $install_libdir -o $output_objdir/$soname $libobjs $deplibs $linker_flags~test $output_objdir/$soname = $lib || mv $output_objdir/$soname $lib' ;;
    *) archive_cmds='$LD -b +h $soname +b $install_libdir -o $lib $libobjs $deplibs $linker_flags' ;;
    esac
    hardcode_libdir_flag_spec='${wl}+b ${wl}$libdir'
    hardcode_libdir_separator=:
    hardcode_direct=yes
    hardcode_minus_L=yes # Not in the search PATH, but as the default
			 # location of the library.
    export_dynamic_flag_spec='${wl}-E'
    ;;

  irix5* | irix6*)
    if test "$GCC" = yes; then
      archive_cmds='$CC -shared $libobjs $deplibs $compiler_flags ${wl}-soname ${wl}$soname `test -n "$verstring" && echo ${wl}-set_version ${wl}$verstring` ${wl}-update_registry ${wl}${output_objdir}/so_locations -o $lib'
    else
      archive_cmds='$LD -shared $libobjs $deplibs $linker_flags -soname $soname `test -n "$verstring" && echo -set_version $verstring` -update_registry ${output_objdir}/so_locations -o $lib'
    fi
    hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
    hardcode_libdir_separator=:
    link_all_deplibs=yes
    ;;

  netbsd*)
    if echo __ELF__ | $CC -E - | grep __ELF__ >/dev/null; then
      archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linker_flags'  # a.out
    else
      archive_cmds='$LD -shared -o $lib $libobjs $deplibs $linker_flags'      # ELF
    fi
    hardcode_libdir_flag_spec='-R$libdir'
    hardcode_direct=yes
    hardcode_shlibpath_var=no
    ;;

  newsos6)
    archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
    hardcode_direct=yes
    hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
    hardcode_libdir_separator=:
    hardcode_shlibpath_var=no
    ;;

  openbsd*)
    hardcode_direct=yes
    hardcode_shlibpath_var=no
    if test -z "`echo __ELF__ | $CC -E - | grep __ELF__`" || test "$host_os-$host_cpu" = "openbsd2.8-powerpc"; then
      archive_cmds='$CC -shared $pic_flag -o $lib $libobjs $deplibs $linker_flags'
      hardcode_libdir_flag_spec='${wl}-rpath,$libdir'
      export_dynamic_flag_spec='${wl}-E'
    else
      case "$host_os" in
      openbsd[[01]].* | openbsd2.[[0-7]] | openbsd2.[[0-7]].*)
	archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linker_flags'
	hardcode_libdir_flag_spec='-R$libdir'
        ;;
      *)
        archive_cmds='$CC -shared $pic_flag -o $lib $libobjs $deplibs $linker_flags'
        hardcode_libdir_flag_spec='${wl}-rpath,$libdir'
        ;;
      esac
    fi
    ;;

  os2*)
    hardcode_libdir_flag_spec='-L$libdir'
    hardcode_minus_L=yes
    allow_undefined_flag=unsupported
    archive_cmds='$echo "LIBRARY $libname INITINSTANCE" > $output_objdir/$libname.def~$echo "DESCRIPTION \"$libname\"" >> $output_objdir/$libname.def~$echo DATA >> $output_objdir/$libname.def~$echo " SINGLE NONSHARED" >> $output_objdir/$libname.def~$echo EXPORTS >> $output_objdir/$libname.def~emxexp $libobjs >> $output_objdir/$libname.def~$CC -Zdll -Zcrtdll -o $lib $libobjs $deplibs $compiler_flags $output_objdir/$libname.def'
    old_archive_from_new_cmds='emximp -o $output_objdir/$libname.a $output_objdir/$libname.def'
    ;;

  osf3*)
    if test "$GCC" = yes; then
      allow_undefined_flag=' ${wl}-expect_unresolved ${wl}\*'
      archive_cmds='$CC -shared${allow_undefined_flag} $libobjs $deplibs $compiler_flags ${wl}-soname ${wl}$soname `test -n "$verstring" && echo ${wl}-set_version ${wl}$verstring` ${wl}-update_registry ${wl}${output_objdir}/so_locations -o $lib'
    else
      allow_undefined_flag=' -expect_unresolved \*'
      archive_cmds='$LD -shared${allow_undefined_flag} $libobjs $deplibs $linker_flags -soname $soname `test -n "$verstring" && echo -set_version $verstring` -update_registry ${output_objdir}/so_locations -o $lib'
    fi
    hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
    hardcode_libdir_separator=:
    ;;

  osf4* | osf5*)	# as osf3* with the addition of -msym flag
    if test "$GCC" = yes; then
      allow_undefined_flag=' ${wl}-expect_unresolved ${wl}\*'
      archive_cmds='$CC -shared${allow_undefined_flag} $libobjs $deplibs $compiler_flags ${wl}-msym ${wl}-soname ${wl}$soname `test -n "$verstring" && echo ${wl}-set_version ${wl}$verstring` ${wl}-update_registry ${wl}${output_objdir}/so_locations -o $lib'
      hardcode_libdir_flag_spec='${wl}-rpath ${wl}$libdir'
    else
      allow_undefined_flag=' -expect_unresolved \*'
      archive_cmds='$LD -shared${allow_undefined_flag} $libobjs $deplibs $linker_flags -msym -soname $soname `test -n "$verstring" && echo -set_version $verstring` -update_registry ${output_objdir}/so_locations -o $lib'
      archive_expsym_cmds='for i in `cat $export_symbols`; do printf "-exported_symbol " >> $lib.exp; echo "\$i" >> $lib.exp; done; echo "-hidden">> $lib.exp~
      $LD -shared${allow_undefined_flag} -input $lib.exp $linker_flags $libobjs $deplibs -soname $soname `test -n "$verstring" && echo -set_version $verstring` -update_registry ${objdir}/so_locations -o $lib~$rm $lib.exp'

      #Both c and cxx compiler support -rpath directly
      hardcode_libdir_flag_spec='-rpath $libdir'
    fi
    hardcode_libdir_separator=:
    ;;

  sco3.2v5*)
    archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
    hardcode_shlibpath_var=no
    runpath_var=LD_RUN_PATH
    hardcode_runpath_var=yes
    export_dynamic_flag_spec='${wl}-Bexport'
    ;;

  solaris*)
    # gcc --version < 3.0 without binutils cannot create self contained
    # shared libraries reliably, requiring libgcc.a to resolve some of
    # the object symbols generated in some cases.  Libraries that use
    # assert need libgcc.a to resolve __eprintf, for example.  Linking
    # a copy of libgcc.a into every shared library to guarantee resolving
    # such symbols causes other problems:  According to Tim Van Holder
    # <[e-mail]>, C++ libraries end up with a separate
    # (to the application) exception stack for one thing.
    no_undefined_flag=' -z defs'
    if test "$GCC" = yes; then
      case `$CC --version 2>/dev/null` in
      [[12]].*)
	cat <<EOF 1>&2

*** Warning: Releases of GCC earlier than version 3.0 cannot reliably
*** create self contained shared libraries on Solaris systems, without
*** introducing a dependency on libgcc.a.  Therefore, libtool is disabling
*** -no-undefined support, which will at least allow you to build shared
*** libraries.  However, you may find that when you link such libraries
*** into an application without using GCC, you have to manually add
*** \`gcc --print-libgcc-file-name\` to the link command.  We urge you to
*** upgrade to a newer version of GCC.  Another option is to rebuild your
*** current GCC to use the GNU linker from GNU binutils 2.9.1 or newer.

EOF
        no_undefined_flag=
	;;
      esac
    fi
    # $CC -shared without GNU ld will not create a library from C++
    # object files and a static libstdc++, better avoid it by now
    archive_cmds='$LD -G${allow_undefined_flag} -h $soname -o $lib $libobjs $deplibs $linker_flags'
    archive_expsym_cmds='$echo "{ global:" > $lib.exp~cat $export_symbols | sed -e "s/\(.*\)/\1;/" >> $lib.exp~$echo "local: *; };" >> $lib.exp~
		$LD -G${allow_undefined_flag} -M $lib.exp -h $soname -o $lib $libobjs $deplibs $linker_flags~$rm $lib.exp'
    hardcode_libdir_flag_spec='-R$libdir'
    hardcode_shlibpath_var=no
    case $host_os in
    solaris2.[[0-5]] | solaris2.[[0-5]].*) ;;
    *) # Supported since Solaris 2.6 (maybe 2.5.1?)
      whole_archive_flag_spec='-z allextract$convenience -z defaultextract' ;;
    esac
    link_all_deplibs=yes
    ;;

  sunos4*)
    if test "x$host_vendor" = xsequent; then
      # Use $CC to link under sequent, because it throws in some extra .o
      # files that make .init and .fini sections work.
      archive_cmds='$CC -G ${wl}-h $soname -o $lib $libobjs $deplibs $compiler_flags'
    else
      archive_cmds='$LD -assert pure-text -Bstatic -o $lib $libobjs $deplibs $linker_flags'
    fi
    hardcode_libdir_flag_spec='-L$libdir'
    hardcode_direct=yes
    hardcode_minus_L=yes
    hardcode_shlibpath_var=no
    ;;

  sysv4)
    if test "x$host_vendor" = xsno; then
      archive_cmds='$LD -G -Bsymbolic -h $soname -o $lib $libobjs $deplibs $linker_flags'
      hardcode_direct=yes # is this really true???
    else
      archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
      hardcode_direct=no #Motorola manual says yes, but my tests say they lie
    fi
    runpath_var='LD_RUN_PATH'
    hardcode_shlibpath_var=no
    ;;

  sysv4.3*)
    archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
    hardcode_shlibpath_var=no
    export_dynamic_flag_spec='-Bexport'
    ;;

  sysv5*)
    no_undefined_flag=' -z text'
    # $CC -shared without GNU ld will not create a library from C++
    # object files and a static libstdc++, better avoid it by now
    archive_cmds='$LD -G${allow_undefined_flag} -h $soname -o $lib $libobjs $deplibs $linker_flags'
    archive_expsym_cmds='$echo "{ global:" > $lib.exp~cat $export_symbols | sed -e "s/\(.*\)/\1;/" >> $lib.exp~$echo "local: *; };" >> $lib.exp~
		$LD -G${allow_undefined_flag} -M $lib.exp -h $soname -o $lib $libobjs $deplibs $linker_flags~$rm $lib.exp'
    hardcode_libdir_flag_spec=
    hardcode_shlibpath_var=no
    runpath_var='LD_RUN_PATH'
    ;;

  uts4*)
    archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
    hardcode_libdir_flag_spec='-L$libdir'
    hardcode_shlibpath_var=no
    ;;

  dgux*)
    archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
    hardcode_libdir_flag_spec='-L$libdir'
    hardcode_shlibpath_var=no
    ;;

  sysv4*MP*)
    if test -d /usr/nec; then
      archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
      hardcode_shlibpath_var=no
      runpath_var=LD_RUN_PATH
      hardcode_runpath_var=yes
      ld_shlibs=yes
    fi
    ;;

  sysv4.2uw2*)
    archive