Index: C:/LLVM/llvm/tools/clang/lib/Driver/Tools.cpp
===================================================================
--- C:/LLVM/llvm/tools/clang/lib/Driver/Tools.cpp
+++ C:/LLVM/llvm/tools/clang/lib/Driver/Tools.cpp
@@ -3589,8 +3589,16 @@
     if (!Args.hasArg(options::OPT__analyzer_no_default_checks)) {
       CmdArgs.push_back("-analyzer-checker=core");
 
-      if (!IsWindowsMSVC)
-        CmdArgs.push_back("-analyzer-checker=unix");
+      // Enable "unix" checkers (which also work on Windows).
+      // Specifically, this enables:
+      // unix.API (open, pthread_once, calloc, malloc, realloc, alloca) checkers,
+      // unix.Malloc (leaks, double-frees, use-after-frees, etc...),
+      // unix.MallocSizeof (misusing sizeof in malloc, calloc, and realloc),
+      // unix.MismatchedDeallocator (calling delete on a malloc'd pointer,
+      //   freeing a new'd pointer, etc...),
+      // unix.cstring.BadSizeArg (strncat buffer size misuse),
+      // unix.cstring.NullArg (passing null pointers to C string functions).
+      CmdArgs.push_back("-analyzer-checker=unix");
 
       if (getToolChain().getTriple().getVendor() == llvm::Triple::Apple)
         CmdArgs.push_back("-analyzer-checker=osx");