From b1ef30736694f644e2e473429257a18b64a7615c Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 4 Jan 2018 10:34:26 +0200
Subject: Fix few undefined behavior (ubsan) bugs

---
 build2/cc/compile.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'build2/cc/compile.cxx')

diff --git a/build2/cc/compile.cxx b/build2/cc/compile.cxx
index 9de037e..47953ee 100644
--- a/build2/cc/compile.cxx
+++ b/build2/cc/compile.cxx
@@ -2973,7 +2973,7 @@ namespace build2
             //
             if (cid == compiler_id::msvc &&
                 cmaj == 19 && cmin <= 11 &&
-                src.is_a (*x_mod))
+                x_mod != nullptr && src.is_a (*x_mod))
             {
               // It's quite painful to guard the export with an #if/#endif so
               // if it is present, "fixup" the (temporary) preprocessed output
-- 
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