1 

     2 usage()

     3 {

     4     cat <<EOF

     5 Usage: libpng-config [OPTION] ...

     6 

     7 Known values for OPTION are:

     8 

     9   --prefix        print libpng prefix

    10   --libdir        print path to directory containing library

    11   --libs          print library linking information

    12   --ccopts        print compiler options

    13   --cppflags      print pre-processor flags

    14   --cflags        print preprocessor flags, I_opts, and compiler options

    15   --I_opts        print "-I" include options

    16   --L_opts        print linker "-L" flags for dynamic linking

    17   --R_opts        print dynamic linker "-R" or "-rpath" flags

    18   --ldopts        print linker options

    19   --ldflags       print linker flags (ldopts, L_opts, R_opts, and libs)

    20   --static        revise subsequent outputs for static linking

    21   --help          print this help and exit

    22   --version       print version information

    23 EOF

    24 

    25     exit $1

    26 }

    27 

    28 if test $# -eq 0; then

    29     usage 1

    30 fi

    31 

    32 while test $# -gt 0; do

    33     case "$1" in

    34 

    35     --prefix)

    36         echo ${prefix}

    37         ;;

    38 

    39     --version)

    40         echo ${version}

    41         exit 0

    42         ;;

    43 

    44     --help)

    45         usage 0

    46         ;;

    47 

    48     --ccopts)

    49         echo ${ccopts}

    50         ;;

    51 

    52     --cppflags)

    53         echo ${cppflags}

    54         ;;

    55 

    56     --cflags)

    57         echo ${I_opts} ${cppflags} ${ccopts}

    58         ;;

    59 

    60     --libdir)

    61         echo ${libdir}

    62         ;;

    63 

    64     --libs)

    65         echo ${libs}

    66         ;;

    67 

    68     --I_opts)

    69         echo ${I_opts}

    70         ;;

    71 

    72     --L_opts)

    73         echo ${L_opts}

    74         ;;

    75 

    76     --R_opts)

    77         echo ${R_opts}

    78         ;;

    79 

    80     --ldflags)

    81         echo ${ldflags} ${L_opts} ${R_opts} ${libs}

    82         ;;

    83 

    84     --static)

    85         R_opts=""

    86         ;;

    87 

    88     *)

    89         usage

    90         exit 1

    91         ;;

    92     esac

    93     shift

    94 done

    95 

    96 exit 0