[rs6000] Enable secureplt by default on musl

	* config.gcc (enable_secureplt): Add *-linux*-musl*.


Co-Authored-By: Szabolcs Nagy <szabolcs.nagy@arm.com>

From-SVN: r229268

gcc/ChangeLog

+2015-10-23  Gregor Richards  <gregor.richards@uwaterloo.ca>
+	    Szabolcs Nagy  <szabolcs.nagy@arm.com>
+
+	* config.gcc (enable_secureplt): Add *-linux*-musl*.
+
 2015-10-23  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/67830

gcc/config.gcc

@@ -2443,6 +2443,10 @@ powerpc*-*-linux*)
 	    powerpc*-*-linux*paired*)
 		tm_file="${tm_file} rs6000/750cl.h" ;;
 	esac
+	case ${target} in
+	    *-linux*-musl*)
+		enable_secureplt=yes ;;
+	esac
 	if test x${enable_secureplt} = xyes; then
 		tm_file="rs6000/secureplt.h ${tm_file}"
 	fi