Add a quick and dirty script to check validity of links in elf files

svn path=/head/; revision=274199

tools/build/check-links.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+# $FreeBSD$
+
+mime=$(file --mime-type $1)
+case $mime in
+*application/x-executable);;
+*application/x-sharedlib);;
+*) echo "Not an elf file" >&2 ; exit 1;;
+esac
+
+# Check for useful libs
+list_libs=""
+for lib in $(readelf -d $1 | awk '$2 == "(NEEDED)" { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do
+        echo -n "checking if $lib is needed: "
+        libpath=$(ldd $1 | awk -v lib=$lib '$1 == lib { print $3 }')
+        list_libs="$list_libs $libpath"
+        foundone=0
+        for fct in $(nm -D $libpath | awk '$2 == "T" || $2 == "W" || $2 == "B" { print $3 }'); do
+                nm -D $1 | awk -v s=$fct '$1 == "U" && $2 == s { found=1 ; exit } END { if (found != 1) { exit 1 } }' && foundone=1 && break
+        done
+        if [ $foundone -eq 1 ]; then
+                echo "yes"
+        else
+                echo "no"
+        fi
+done
+
+for sym in $(nm -D $1 | awk '$1 == "U" { print $2 }'); do
+        found=0
+        for l in ${list_libs} ; do
+                nm -D $l | awk -v s=$sym '($2 == "T" || $2 == "W" || $2 == "B") && $3 == s { found=1 ; exit } END { if (found != 1) { exit 1 } }' && found=1 && break
+        done
+        if [ $found -eq 0 ]; then
+                echo "Unresolved symbol $sym"
+        fi
+done
+