build-aux/gen-linker-script

   1 #!/bin/bash
   2
   3 ###############
   4 # Generate a linker script for GNU ld.
   5 #
   6 #
   7 #
   8
   9
  10
  11 error () {
  12     echo "error: $*" 1>&2
  13 }
  14
  15 info () {
  16     echo "$*" 1>&2
  17 }
  18
  19 warning () {
  20     echo "warning: $*" 1>&2
  21 }
  22
  23 usage () {
  24     info "usage: $0 [-p <pattern>] [-I <ignore-list>] -o <output> <inputs>"
  25     exit ${1:-1}
  26 }
  27
  28 emit () {
  29     echo "$*" >> $OUTPUT
  30 }
  31
  32
  33 # set up defaults
  34 PATTERN="^mrp_|^_mrp_"                # export everything prefixed with mrp_
  35 IGNORE="MRP_PRINTF_LIKE,MRP_NULLTERM" # ignore these symbols/macros
  36 IT=","                                # ignore-list is comma-separated
  37 SOURCES=""                            # no default input, must be specified
  38 OUTPUT=""                             # no default output, must be specified
  39
  40 # parse command line
  41 while [ -n "${1#-}" ]; do
  42     case $1 in
  43         -o)
  44             if [ -z "$OUTPUT" ]; then
  45                 shift
  46                 OUTPUT="$1"
  47             else
  48                 error "Multiple output files requested."
  49                 usage
  50             fi
  51             ;;
  52         -p)
  53             shift;
  54             PATTERN="$1"
  55             ;;
  56         -I)
  57             shift
  58             IGNORE="$IGNORE$IT$1"
  59             IT=","
  60             ;;
  61         -h)
  62             usage 0
  63             ;;
  64         -q)
  65             QUIET="yes"
  66             ;;
  67         -*)
  68             error "Unknown option '$1'."
  69             usage
  70             ;;
  71         *)
  72             SOURCES="$SOURCES $1"
  73             ;;
  74     esac
  75     shift
  76 done
  77
  78 # check that we've got everything mandatory
  79 if [ -z "$OUTPUT" ]; then
  80     error "No output file specified (use the -o option)."
  81     usage
  82 fi
  83
  84 if [ -z "$SOURCES" ]; then
  85     warning "No input files, generating local-only linker script."
  86     emit "{"
  87     emit "    local:"
  88     emit "        *;"
  89     emit "};"
  90     exit 0
  91 fi
  92
  93 if [ -z "$PATTERN" ]; then
  94     PATTERN="^mrp_"
  95 fi
  96
  97 if [ -n "$IGNORE" ]; then
  98     ignore_opts="-I $IGNORE"
  99 else
 100     ignore_opts=""
 101 fi
 102
 103 # generate the output
 104 [ -n "$QUIET" ] || info "Generating linker script $OUTPUT..."
 105 rm -f $OUTPUT
 106 touch $OUTPUT
 107
 108 emit "{"
 109 emit "    global:"
 110 ctags $ignore_opts -f - --c-kinds=px $SOURCES | \
 111     awk "/$PATTERN/ { print \$1; }" | \
 112         sort | \
 113             while read sym; do
 114                 emit "        $sym;"
 115             done
 116
 117 emit "    local:"
 118 emit "        *;"
 119 emit "};"