From bc0e12f2af38151d1df308f6f3ad430f802e9c9f Mon Sep 17 00:00:00 2001
From: Davis King <davis@dlib.net>
Date: Fri, 23 Jul 2010 20:20:34 +0000
Subject: [PATCH] Changed code slightly to avoid a warning from gcc.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403758
---
 dlib/svm/kernel_matrix.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlib/svm/kernel_matrix.h b/dlib/svm/kernel_matrix.h
index 5ea8d0df4..028cb9c84 100644
--- a/dlib/svm/kernel_matrix.h
+++ b/dlib/svm/kernel_matrix.h
@@ -79,7 +79,13 @@ namespace dlib
         {}
 
         template <typename T>
+        // This funny #ifdef thing is here because gcc sometimes gives a warning 
+        // about v being unused otherwise.
+#ifdef ENABLE_ASSERTS
         void assert_is_vector(const matrix_exp<T>& v)
+#else
+        void assert_is_vector(const matrix_exp<T>& )
+#endif
         {
             // make sure requires clause is not broken
             DLIB_ASSERT(is_vector(v) == true,