Don't remove source files specified on the command line!

2 files changed, 8 insertions, 1 deletions

diff --git a/src/engine/SCons/Node/FS.py b/src/engine/SCons/Node/FS.py
index 5d01314..96381e3 100644
--- a/src/engine/SCons/Node/FS.py
+++ b/src/engine/SCons/Node/FS.py
@@ -773,7 +773,7 @@ class File(Entry):
     def prepare(self):
         """Prepare for this file to be created."""
         if self.exists():
-            if not self.precious:
+            if self.builder and not self.precious:
                 os.unlink(self.path)
                 if hasattr(self, '_exists'):
                     delattr(self, '_exists')
diff --git a/src/engine/SCons/Node/FSTests.py b/src/engine/SCons/Node/FSTests.py
index 24a508b..3bba3f4 100644
--- a/src/engine/SCons/Node/FSTests.py
+++ b/src/engine/SCons/Node/FSTests.py
@@ -493,9 +493,16 @@ class FSTestCase(unittest.TestCase):
         nonexistent(fs.Dir, 'nonexistent')
         nonexistent(fs.Dir, 'nonexistent/foo')
 
+        test.write("preserve_me", "\n")
+        assert os.path.exists(test.workpath("preserve_me"))
+        f1 = fs.File(test.workpath("preserve_me"))
+        f1.prepare()
+        assert os.path.exists(test.workpath("preserve_me"))
+
         test.write("remove_me", "\n")
         assert os.path.exists(test.workpath("remove_me"))
         f1 = fs.File(test.workpath("remove_me"))
+        f1.builder = 1
         f1.prepare()
         assert not os.path.exists(test.workpath("remove_me"))