tools/build/check-links.sh

   1 #!/bin/sh
   2 # $FreeBSD$
   3
   4 ret=0
   5 CHECK_UNRESOLVED=1
   6 DEMANGLE=
   7 while getopts "DU" flag; do
   8         case "${flag}" in
   9                 D) DEMANGLE="-C" ;;
  10                 U) CHECK_UNRESOLVED=0 ;;
  11         esac
  12 done
  13 shift $((OPTIND-1))
  14
  15 mime=$(file -L --mime-type $1)
  16 case $mime in
  17 *application/x-executable);;
  18 *application/x-sharedlib);;
  19 *) echo "Not an elf file" >&2 ; exit 1;;
  20 esac
  21
  22 # Gather all symbols from the target
  23 unresolved_symbols=$(nm ${DEMANGLE} -D -u --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ')
  24 ldd_libs=$(ldd $(realpath $1) | awk '{print $1 ":" $3}')
  25
  26 libkey() {
  27         libkey="lib_symbols_$1"
  28         patterns=[.+,-]
  29         replacement=_
  30         while :; do
  31                 case " ${libkey} " in
  32                         *${patterns}*)
  33                                 libkey="${libkey%%${patterns}*}${replacement}${libkey#*${patterns}}"
  34                                 ;;
  35                         *)
  36                                 break
  37                                 ;;
  38                 esac
  39         done
  40         return 0
  41 }
  42
  43 # Check for useful libs
  44 list_libs=
  45 resolved_symbols=
  46 for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do
  47         echo -n "checking if $lib is needed: "
  48         for libpair in ${ldd_libs}; do
  49                 case "${libpair}" in
  50                         ${lib}:*) libpath="${libpair#*:}" && break ;;
  51                 esac
  52         done
  53         list_libs="$list_libs $lib"
  54         foundone=
  55         lib_symbols="$(nm ${DEMANGLE} -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
  56         if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  57                 # Save the global symbols for this lib
  58                 libkey "${lib}"
  59                 setvar "${libkey}"  "${lib_symbols}"
  60         fi
  61         for fct in ${lib_symbols}; do
  62                 case " ${unresolved_symbols} " in
  63                         *\ ${fct}\ *) foundone="${fct}" && break ;;
  64                 esac
  65         done
  66         if [ -n "${foundone}" ]; then
  67                 echo "yes... ${foundone}"
  68         else
  69                 echo "no"
  70                 ret=1
  71         fi
  72 done
  73
  74 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  75         for sym in ${unresolved_symbols}; do
  76                 found=0
  77                 for lib in ${list_libs}; do
  78                         libkey "${lib}"
  79                         eval "lib_symbols=\"\${${libkey}}\""
  80                         # lib_symbols now contains symbols for the lib.
  81                         case " ${lib_symbols} " in
  82                                 *\ ${sym}\ *) found=1 && break ;;
  83                         esac
  84                 done
  85                 if [ $found -eq 0 ]; then
  86                         echo "Unresolved symbol $sym"
  87                         ret=1
  88                 fi
  89         done
  90 fi
  91
  92 exit ${ret}