tools/build/check-links.sh

   1 #!/bin/sh
   2 # $FreeBSD$
   3
   4 libkey() {
   5         libkey="lib_symbols_$1"
   6         patterns=[.+,/-]
   7         replacement=_
   8         while :; do
   9                 case " ${libkey} " in
  10                         *${patterns}*)
  11                                 libkey="${libkey%%${patterns}*}${replacement}${libkey#*${patterns}}"
  12                                 ;;
  13                         *)
  14                                 break
  15                                 ;;
  16                 esac
  17         done
  18         return 0
  19 }
  20
  21 ret=0
  22 CHECK_UNRESOLVED=1
  23 while getopts "U" flag; do
  24         case "${flag}" in
  25                 U) CHECK_UNRESOLVED=0 ;;
  26         esac
  27 done
  28 shift $((OPTIND-1))
  29
  30 mime=$(file -L --mime-type $1)
  31 isbin=0
  32 case $mime in
  33 *application/x-executable) isbin=1 ;;
  34 *application/x-sharedlib);;
  35 *) echo "Not an elf file" >&2 ; exit 1;;
  36 esac
  37
  38 # Gather all symbols from the target
  39 unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ')
  40 [ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ')
  41 ldd_libs=$(ldd $(realpath $1) | awk '{print $1 ":" $3}')
  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 $lib is needed: "
  48         if [ -n "${lib##/*}" ]; then
  49                 for libpair in ${ldd_libs}; do
  50                         case "${libpair}" in
  51                                 ${lib}:*) libpath="${libpair#*:}" && break ;;
  52                         esac
  53                 done
  54         else
  55                 libpath="${lib}"
  56         fi
  57         list_libs="$list_libs $lib"
  58         foundone=
  59         lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
  60         if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  61                 # Save the global symbols for this lib
  62                 libkey "${lib}"
  63                 setvar "${libkey}" "${lib_symbols}"
  64         fi
  65         for fct in ${lib_symbols}; do
  66                 case " ${unresolved_symbols} ${bss_symbols} " in
  67                         *\ ${fct}\ *) foundone="${fct}" && break ;;
  68                 esac
  69         done
  70         if [ -n "${foundone}" ]; then
  71                 echo "yes... ${foundone}"
  72         else
  73                 echo "no"
  74                 ret=1
  75         fi
  76 done
  77
  78 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  79         # Add in crt1 symbols
  80         list_libs="${list_libs} crt1.o"
  81         lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
  82         # Save the global symbols for this lib
  83         libkey "crt1.o"
  84         setvar "${libkey}" "${lib_symbols}"
  85
  86         # No search libs for all symbols and report missing ones.
  87         for sym in ${unresolved_symbols}; do
  88                 found=0
  89                 for lib in ${list_libs}; do
  90                         libkey "${lib}"
  91                         eval "lib_symbols=\"\${${libkey}}\""
  92                         # lib_symbols now contains symbols for the lib.
  93                         case " ${lib_symbols} " in
  94                                 *\ ${sym}\ *) found=1 && break ;;
  95                         esac
  96                 done
  97                 if [ $found -eq 0 ]; then
  98                         echo "Unresolved symbol $sym"
  99                         ret=1
 100                 fi
 101         done
 102 fi
 103
 104 exit ${ret}