scripts/undefsym.sh

   1 #! /usr/bin/env bash
   2
   3 # Before a shared module's DSO is produced, a static library is built for it
   4 # and passed to this script.  The script generates -Wl,-u options to force
   5 # the inclusion of symbol from libqemuutil.a if the shared modules need them,
   6 # This is necessary because the modules may use functions not needed by the
   7 # executable itself, which would cause the function to not be linked in.
   8 # Then the DSO loading would fail because of the missing symbol.
   9
  10 if test $# -le 2; then
  11   exit 0
  12 fi
  13
  14 NM=$1
  15 staticlib=$2
  16 shift 2
  17 # Find symbols defined in static libraries and undefined in shared modules
  18 comm -12 \
  19   <( $NM -P -g $staticlib | awk '$2!="U"{print "-Wl,-u," $1}' | sort -u) \
  20   <( $NM -P -g "$@" | awk '$2=="U"{print "-Wl,-u," $1}' | sort -u)