extract-dynsym

   1 #!/bin/sh
   2
   3 # Extract from an ELF shared object file just the dynamic symbols necessary
   4 # to link against it and the (GNU extension) warning sections that linking
   5 # against it may use to produce warning messages.
   6
   7 infile=$1
   8 outfile=$2
   9
  10 # Handle both objdump -h output formats.
  11 osechdr='^SECTION [0-9]+ \['
  12 nsechdr='^ +[0-9]+ '
  13
  14 $OBJCOPY -S `$OBJDUMP -h $infile | $AWK "
  15 /($osechdr|$nsechdr)"'\.(hash|dyn[a-z]+|gnu\.warning[a-zA-Z_.]*) / { next; }
  16 /'"$osechdr"'/ { printf "--remove-section=%s ", $3 }
  17 /'"$nsechdr"'/ { printf "--remove-section=%s ", $2 }
  18 ' |
  19 # The old format puts brackets around section names.  The new format fails
  20 # to delimit long section names from the following hex digits.
  21 sed -e 's/[][]//g' -e 's/0[0-9a-f]* / /g'` $infile $outfile.new
  22
  23 mv -f $outfile.new $outfile