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