Merge pull request #541 from davidt/compiler-stdout-unbound

Fix an UnboundLocalError if a compiler fails.

pipeline/compilers/__init__.py

@@ -111,6 +111,7 @@ class SubProcessCompiler(CompilerBase):
             else:
                 argument_list.extend(flattening_arg)
 
+        stdout = None
         try:
             # We always catch stdout in a file, but we may not have a use for it.
             temp_file_container = cwd or os.path.dirname(stdout_captured or "") or os.getcwd()
@@ -135,6 +136,7 @@ class SubProcessCompiler(CompilerBase):
             raise CompilerError(e)
         finally:
             # Decide what to do with captured stdout.
+            if stdout:
                 if stdout_captured:
                     os.rename(stdout.name, os.path.join(cwd or os.curdir, stdout_captured))
                 else: