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#*${patterns}}"
  12                                 ;;
  13                         *)
  14                                 break
  15                                 ;;
  16                 esac
  17         done
  18         return 0
  19 }
  20
  21 ret=0
  22 CHECK_UNRESOLVED=1
  23 VERBOSE_RESOLVED=0
  24 while getopts "Uv" flag; do
  25         case "${flag}" in
  26                 U) CHECK_UNRESOLVED=0 ;;
  27                 v) VERBOSE_RESOLVED=1 ;;
  28         esac
  29 done
  30 shift $((OPTIND-1))
  31
  32 mime=$(file -L --mime-type $1)
  33 isbin=0
  34 case $mime in
  35 *application/x-executable) isbin=1 ;;
  36 *application/x-sharedlib);;
  37 *) echo "Not an elf file" >&2 ; exit 1;;
  38 esac
  39
  40 # Gather all symbols from the target
  41 unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ')
  42 [ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ')
  43 ldd_libs=$(ldd $(realpath $1) | awk '{print $1 ":" $3}')
  44
  45 # Check for useful libs
  46 list_libs=
  47 resolved_symbols=
  48 for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do
  49         echo -n "checking if $lib is needed: "
  50         if [ -n "${lib##/*}" ]; then
  51                 for libpair in ${ldd_libs}; do
  52                         case "${libpair}" in
  53                                 ${lib}:*) libpath="${libpair#*:}" && break ;;
  54                         esac
  55                 done
  56         else
  57                 libpath="${lib}"
  58         fi
  59         list_libs="$list_libs $lib"
  60         foundone=
  61         lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
  62         if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  63                 # Save the global symbols for this lib
  64                 libkey "${lib}"
  65                 setvar "${libkey}" "${lib_symbols}"
  66         fi
  67         for fct in ${lib_symbols}; do
  68                 case " ${unresolved_symbols} ${bss_symbols} " in
  69                         *\ ${fct}\ *) foundone="${fct}" && break ;;
  70                 esac
  71         done
  72         if [ -n "${foundone}" ]; then
  73                 echo "yes... ${foundone}"
  74         else
  75                 echo "no"
  76                 ret=1
  77         fi
  78 done
  79
  80 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  81         # Add in crt1 symbols
  82         list_libs="${list_libs} crt1.o"
  83         lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
  84         # Save the global symbols for this lib
  85         libkey "crt1.o"
  86         setvar "${libkey}" "${lib_symbols}"
  87
  88         # Now search libs for all symbols and report missing ones.
  89         for sym in ${unresolved_symbols}; do
  90                 found=0
  91                 for lib in ${list_libs}; do
  92                         libkey "${lib}"
  93                         eval "lib_symbols=\"\${${libkey}}\""
  94                         # lib_symbols now contains symbols for the lib.
  95                         case " ${lib_symbols} " in
  96                                 *\ ${sym}\ *)
  97                                         [ ${VERBOSE_RESOLVED} -eq 1 ] &&
  98                                             echo "Resolved symbol ${sym} from ${lib}"
  99                                         found=1
 100                                         break
 101                                         ;;
 102                         esac
 103                 done
 104                 if [ $found -eq 0 ]; then
 105                         echo "Unresolved symbol $sym"
 106                         ret=1
 107                 fi
 108         done
 109 fi
 110
 111 exit ${ret}