From 81bc7610abe68d158683877f04fc46c2a32c3b44 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 8 Mar 2018 09:01:53 -0500
Subject: Makefile: Fix "make clean" when there are no targets

The empty `clean` target was missing from `Makefile2`.
Add one like we already have for `all` and `preinstall`.
---
 Source/cmGlobalUnixMakefileGenerator3.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/cmGlobalUnixMakefileGenerator3.cxx b/Source/cmGlobalUnixMakefileGenerator3.cxx
index 43032fb..c92df55 100644
--- a/Source/cmGlobalUnixMakefileGenerator3.cxx
+++ b/Source/cmGlobalUnixMakefileGenerator3.cxx
@@ -241,6 +241,10 @@ void cmGlobalUnixMakefileGenerator3::WriteMainMakefile2()
   lg->WriteMakeRule(makefileStream, "The main recursive preinstall target",
                     "preinstall", depends, no_commands, true);
 
+  // Write an empty clean:
+  lg->WriteMakeRule(makefileStream, "The main recursive clean target", "clean",
+                    depends, no_commands, true);
+
   // Write out the "special" stuff
   lg->WriteSpecialTargetsTop(makefileStream);
 
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