Fix shared library dependencies verification on some platforms (#8349)

The existing way of verifying shared library dependencies, used for
System.Globalization.Native.so, doesn't work on platforms that don't
have ldd or where ldd doesn't support the `-r` option.
This change makes the check happen on non-Alpine Linux only for now.
It also refactors the way the check is performed. Instead of doing it
post build in the build.sh, it is now performed as a postbuild phase
of the System.Globalization.Native target and it is also generalized
so that we can easily add such verification to other build targets.
The new verify-so.sh script is also used in corefx.

1 files changed, 20 insertions, 0 deletions

diff --git a/verify-so.sh b/verify-so.sh
new file mode 100755
index 0000000000..3907cf1db0
--- /dev/null
+++ b/verify-so.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# $1 contains full path to the .so to verify
+# $2 contains message to print when the verification fails
+
+OSName=$(uname -s)
+case $OSName in
+    Linux)
+        source /etc/os-release
+        # TODO: add support for verification on Alpine Linux
+        if [ "$ID" != "alpine" ]; then
+            ldd -r $1 | awk 'BEGIN {count=0} /undefined symbol:/ { if (count==0) {print "Undefined symbol(s) found:"} print " " $3; count++ } END {if (count>0) exit(1)}'
+            if [ $? != 0 ]; then
+                echo "$2"
+                exit 1
+            fi
+        fi
+        ;;
+esac
+
+# TODO: add support for verification on non-Linux Unixes (except of OSX)